{"id":2084,"date":"2025-12-01T11:30:46","date_gmt":"2025-12-01T03:30:46","guid":{"rendered":"https:\/\/www.c-adtech.com\/?p=2084"},"modified":"2025-12-01T11:36:54","modified_gmt":"2025-12-01T03:36:54","slug":"what-is-ceramic-foam-filter","status":"publish","type":"post","link":"https:\/\/www.c-adtech.com\/pt\/what-is-ceramic-foam-filter\/","title":{"rendered":"O que \u00e9 o filtro de espuma cer\u00e2mica?"},"content":{"rendered":"<p>A <a href=\"https:\/\/www.c-adtech.com\/pt\/produto\/ceramic-foam-filter\/\">filtro de espuma de cer\u00e2mica<\/a> \u00e9 um bloco refrat\u00e1rio tridimensional de c\u00e9lulas abertas utilizado para remover inclus\u00f5es n\u00e3o met\u00e1licas e controlar o fluxo de metal durante o enchimento do molde. Quando colocados num sistema de comportas, estes filtros ret\u00eam pel\u00edculas de \u00f3xido, esc\u00f3rias, areia e outras part\u00edculas, ao mesmo tempo que suavizam o fluxo, pelo que as pe\u00e7as fundidas finais apresentam menos defeitos, melhor integridade mec\u00e2nica e um melhor acabamento superficial.<\/p>\n<h2 data-start=\"1010\" data-end=\"1033\">O que \u00e9 um filtro de espuma de cer\u00e2mica?<\/h2>\n<p data-start=\"1035\" data-end=\"1517\">A <strong>filtro de espuma de cer\u00e2mica<\/strong> \u00e9 um bloco cer\u00e2mico r\u00edgido de c\u00e9lulas abertas criado a partir de um modelo de pol\u00edmero que \u00e9 revestido, seco e sinterizado. O modelo confere \u00e0 pe\u00e7a final uma rede de vazios interligados. O metal fundido passa atrav\u00e9s da rede enquanto as part\u00edculas ficam presas nos suportes internos e nas janelas dos poros. Esta filtragem ocorre atrav\u00e9s de uma combina\u00e7\u00e3o de captura inercial, interce\u00e7\u00e3o e adsor\u00e7\u00e3o em leito profundo ao longo da espessura do filtro.<\/p>\n<figure id=\"attachment_1929\" aria-describedby=\"caption-attachment-1929\" style=\"width: 570px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-1929\" src=\"http:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/11\/talz8-dqszn.webp\" alt=\"Filtro de espuma cer\u00e2mica\" width=\"570\" height=\"570\" srcset=\"https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/11\/talz8-dqszn.webp 570w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/11\/talz8-dqszn-300x300.webp 300w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/11\/talz8-dqszn-150x150.webp 150w\" sizes=\"(max-width: 570px) 100vw, 570px\" \/><figcaption id=\"caption-attachment-1929\" class=\"wp-caption-text\">Filtro de espuma cer\u00e2mica<\/figcaption><\/figure>\n<h2 data-start=\"1519\" data-end=\"1564\">Porque \u00e9 que as fundi\u00e7\u00f5es utilizam filtros de espuma de cer\u00e2mica<\/h2>\n<p data-start=\"1566\" data-end=\"1644\">Resposta curta: melhoram a qualidade da fundi\u00e7\u00e3o, reduzem o retrabalho e aumentam o rendimento.<\/p>\n<p data-start=\"1646\" data-end=\"1680\">Explica\u00e7\u00e3o mais longa em forma de marcador:<\/p>\n<ul data-start=\"1681\" data-end=\"2229\">\n<li data-start=\"1681\" data-end=\"1816\">\n<p data-start=\"1683\" data-end=\"1816\">Remover \u00f3xidos em suspens\u00e3o, esc\u00f3rias, areia e outros detritos que causam defeitos superficiais e internos.<\/p>\n<\/li>\n<li data-start=\"1817\" data-end=\"1966\">\n<p data-start=\"1819\" data-end=\"1966\">Produzem um fluxo de metal mais est\u00e1vel que diminui a turbul\u00eancia no interior do molde, reduzindo o aprisionamento de g\u00e1s e as paragens a frio.<\/p>\n<\/li>\n<li data-start=\"1967\" data-end=\"2112\">\n<p data-start=\"1969\" data-end=\"2112\">Fornecer uma resist\u00eancia t\u00e9rmica que tolere as temperaturas de fus\u00e3o comuns para os tipos de alum\u00ednio, ferro e a\u00e7o.<\/p>\n<\/li>\n<li data-start=\"2113\" data-end=\"2229\">\n<p data-start=\"2115\" data-end=\"2229\">Oferecem um desempenho repet\u00edvel com classifica\u00e7\u00f5es PPI padr\u00e3o para sele\u00e7\u00e3o de filtros.<\/p>\n<\/li>\n<\/ul>\n<p>Leia tamb\u00e9m: <a title=\"Como fazer um filtro de cer\u00e2mica\" href=\"https:\/\/www.c-adtech.com\/pt\/how-to-make-a-ceramic-filter\/\" target=\"_self\">Como fazer um filtro de cer\u00e2mica<\/a>.<\/p>\n<h2 data-start=\"2231\" data-end=\"2271\">Como funciona a filtragem de espuma cer\u00e2mica<\/h2>\n<figure id=\"attachment_2085\" aria-describedby=\"caption-attachment-2085\" style=\"width: 654px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-2085 size-full\" src=\"http:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/asv7b-mbkde.webp\" alt=\"Como funciona o processo de filtra\u00e7\u00e3o por espuma cer\u00e2mica\" width=\"654\" height=\"292\" srcset=\"https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/asv7b-mbkde.webp 654w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/asv7b-mbkde-300x134.webp 300w, https:\/\/www.c-adtech.com\/wp-content\/uploads\/2025\/12\/asv7b-mbkde-18x8.webp 18w\" sizes=\"(max-width: 654px) 100vw, 654px\" \/><figcaption id=\"caption-attachment-2085\" class=\"wp-caption-text\">Como funciona o processo de filtra\u00e7\u00e3o por espuma cer\u00e2mica<\/figcaption><\/figure>\n<h3 data-start=\"2273\" data-end=\"2314\">Perfil do caudal e filtragem em profundidade<\/h3>\n<p data-start=\"2316\" data-end=\"2594\">O metal fundido viaja atrav\u00e9s de muitos canais tortuosos. As part\u00edculas deslocam-se em dire\u00e7\u00e3o aos locais de captura nos suportes cer\u00e2micos. Ao longo da profundidade do filtro, a distribui\u00e7\u00e3o do tamanho das part\u00edculas altera-se. As part\u00edculas mais pequenas podem alojar-se na matriz do suporte. As part\u00edculas maiores bloqueiam as janelas dos poros perto da face do filtro.<\/p>\n<p data-start=\"2596\" data-end=\"2803\">Na literatura, este processo \u00e9 normalmente designado por filtra\u00e7\u00e3o em leito profundo. A efici\u00eancia da captura depende da geometria dos poros, do tamanho da garganta dos poros, da viscosidade da massa fundida e da velocidade do fluxo.<\/p>\n<h3 data-start=\"2805\" data-end=\"2840\">Mecanismos de captura dominantes<\/h3>\n<ul data-start=\"2842\" data-end=\"3176\">\n<li data-start=\"2842\" data-end=\"2946\">\n<p data-start=\"2844\" data-end=\"2946\"><strong data-start=\"2844\" data-end=\"2866\">Impacta\u00e7\u00e3o por in\u00e9rcia<\/strong>As part\u00edculas mais pesadas n\u00e3o conseguem seguir as linhas de fluxo, colidindo com as superf\u00edcies das escoras.<\/p>\n<\/li>\n<li data-start=\"2947\" data-end=\"3059\">\n<p data-start=\"2949\" data-end=\"3059\"><strong data-start=\"2949\" data-end=\"2965\">Interce\u00e7\u00e3o<\/strong>part\u00edculas que seguem linhas de fluxo tocam numa escora porque o di\u00e2metro das part\u00edculas excede o intervalo local.<\/p>\n<\/li>\n<li data-start=\"3060\" data-end=\"3176\">\n<p data-start=\"3062\" data-end=\"3176\"><strong data-start=\"3062\" data-end=\"3090\">Difus\u00e3o e adsor\u00e7\u00e3o<\/strong>part\u00edculas muito finas movem-se de forma aleat\u00f3ria e aderem \u00e0s superf\u00edcies internas das escoras.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"3178\" data-end=\"3207\">Vantagens do controlo do fluxo<\/h3>\n<p data-start=\"3209\" data-end=\"3415\">Os filtros tamb\u00e9m condicionam o fluxo de metal. A suaviza\u00e7\u00e3o do fluxo reduz os v\u00f3rtices que causam a dobragem do \u00f3xido. Em alguns sistemas, os filtros ajudam a criar uma frente de enchimento laminar que reduz a turbul\u00eancia perto de sec\u00e7\u00f5es cr\u00edticas.<\/p>\n<h2 data-start=\"3417\" data-end=\"3465\">Materiais cer\u00e2micos comuns e suas carater\u00edsticas<\/h2>\n<p data-start=\"3467\" data-end=\"3546\">A qu\u00edmica diferente adapta-se a diferentes sistemas de fus\u00e3o. Os materiais t\u00edpicos incluem:<\/p>\n<div class=\"_tableContainer_1rjym_1\">\n<div class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"3548\" data-end=\"4103\">\n<thead data-start=\"3548\" data-end=\"3629\">\n<tr data-start=\"3548\" data-end=\"3629\">\n<th data-start=\"3548\" data-end=\"3566\" data-col-size=\"sm\">Fam\u00edlia de materiais<\/th>\n<th data-start=\"3566\" data-end=\"3588\" data-col-size=\"sm\">composi\u00e7\u00f5es comuns<\/th>\n<th data-start=\"3588\" data-end=\"3605\" data-col-size=\"md\">propriedades essenciais<\/th>\n<th data-start=\"3605\" data-end=\"3629\" data-col-size=\"sm\">alvos t\u00edpicos de fus\u00e3o<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"3649\" data-end=\"4103\">\n<tr data-start=\"3649\" data-end=\"3757\">\n<td data-start=\"3649\" data-end=\"3667\" data-col-size=\"sm\">Alumina (Al\u2082O\u2083)<\/td>\n<td data-col-size=\"sm\" data-start=\"3667\" data-end=\"3694\">&gt;90% Al\u2082O\u2083, misturas ligadas<\/td>\n<td data-col-size=\"md\" data-start=\"3694\" data-end=\"3738\">boa refractariedade, baixa rea\u00e7\u00e3o com Al<\/td>\n<td data-col-size=\"sm\" data-start=\"3738\" data-end=\"3757\">ligas de alum\u00ednio<\/td>\n<\/tr>\n<tr data-start=\"3758\" data-end=\"3877\">\n<td data-start=\"3758\" data-end=\"3782\" data-col-size=\"sm\">Carboneto de sil\u00edcio (SiC)<\/td>\n<td data-col-size=\"sm\" data-start=\"3782\" data-end=\"3800\">Misturas ricas em SiC<\/td>\n<td data-col-size=\"md\" data-start=\"3800\" data-end=\"3844\">elevada resist\u00eancia ao choque t\u00e9rmico, condutor<\/td>\n<td data-col-size=\"sm\" data-start=\"3844\" data-end=\"3877\">ferro, a\u00e7o, ligas de alta temperatura<\/td>\n<\/tr>\n<tr data-start=\"3878\" data-end=\"4008\">\n<td data-start=\"3878\" data-end=\"3896\" data-col-size=\"sm\">Zirc\u00f3nio (ZrO\u2082)<\/td>\n<td data-col-size=\"sm\" data-start=\"3896\" data-end=\"3925\">fases estabilizadas de zirc\u00f3nio<\/td>\n<td data-col-size=\"md\" data-start=\"3925\" data-end=\"3977\">excelente in\u00e9rcia qu\u00edmica, estabilidade a altas temperaturas<\/td>\n<td data-col-size=\"sm\" data-start=\"3977\" data-end=\"4008\">a\u00e7o topo de gama, superligas<\/td>\n<\/tr>\n<tr data-start=\"4009\" data-end=\"4103\">\n<td data-start=\"4009\" data-end=\"4031\" data-col-size=\"sm\">Mullite e h\u00edbridos<\/td>\n<td data-col-size=\"sm\" data-start=\"4031\" data-end=\"4050\">Misturas de Al\u2082O\u2083-SiO\u2082<\/td>\n<td data-col-size=\"md\" data-start=\"4050\" data-end=\"4079\">equil\u00edbrio entre resist\u00eancia e custo<\/td>\n<td data-col-size=\"sm\" data-start=\"4079\" data-end=\"4103\">trabalhos gerais de fundi\u00e7\u00e3o<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"4105\" data-end=\"4192\"><em data-start=\"4105\" data-end=\"4154\">Quadro 1: op\u00e7\u00f5es de materiais e casos de utiliza\u00e7\u00e3o comuns.<\/em><\/p>\n<h2 data-start=\"4194\" data-end=\"4238\">M\u00e9tricas de poros, PPI e l\u00f3gica de sele\u00e7\u00e3o<\/h2>\n<p data-start=\"4240\" data-end=\"4459\">PPI significa poros por polegada linear. Os filtros de fundi\u00e7\u00e3o utilizam frequentemente um sistema de classifica\u00e7\u00e3o de 10 PPI a 70 PPI. Um PPI mais elevado significa janelas de poros mais pequenas, maior \u00e1rea de superf\u00edcie interna, maior efici\u00eancia de captura e maior queda de press\u00e3o.<\/p>\n<div class=\"_tableContainer_1rjym_1\">\n<div class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"4461\" data-end=\"4825\">\n<thead data-start=\"4461\" data-end=\"4523\">\n<tr data-start=\"4461\" data-end=\"4523\">\n<th data-start=\"4461\" data-end=\"4473\" data-col-size=\"sm\">Gama PPI<\/th>\n<th data-start=\"4473\" data-end=\"4495\" data-col-size=\"sm\">janela de poro nominal<\/th>\n<th data-start=\"4495\" data-end=\"4511\" data-col-size=\"sm\">utiliza\u00e7\u00e3o pr\u00e1tica<\/th>\n<th data-start=\"4511\" data-end=\"4523\" data-col-size=\"md\">compromisso<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"4544\" data-end=\"4825\">\n<tr data-start=\"4544\" data-end=\"4631\">\n<td data-start=\"4544\" data-end=\"4556\" data-col-size=\"sm\">10-20 PPI<\/td>\n<td data-col-size=\"sm\" data-start=\"4556\" data-end=\"4564\">grande<\/td>\n<td data-col-size=\"sm\" data-start=\"4564\" data-end=\"4598\">pe\u00e7as fundidas pesadas, baixa restri\u00e7\u00e3o<\/td>\n<td data-col-size=\"md\" data-start=\"4598\" data-end=\"4631\">baixa captura de part\u00edculas finas<\/td>\n<\/tr>\n<tr data-start=\"4632\" data-end=\"4716\">\n<td data-start=\"4632\" data-end=\"4644\" data-col-size=\"sm\">20-40 PPI<\/td>\n<td data-col-size=\"sm\" data-start=\"4644\" data-end=\"4653\">m\u00e9dio<\/td>\n<td data-col-size=\"sm\" data-start=\"4653\" data-end=\"4687\">uso geral para ferro, a\u00e7o<\/td>\n<td data-col-size=\"md\" data-start=\"4687\" data-end=\"4716\">captura e vida equilibradas<\/td>\n<\/tr>\n<tr data-start=\"4717\" data-end=\"4825\">\n<td data-start=\"4717\" data-end=\"4729\" data-col-size=\"sm\">40-70 PPI<\/td>\n<td data-col-size=\"sm\" data-start=\"4729\" data-end=\"4737\">pequeno<\/td>\n<td data-col-size=\"sm\" data-start=\"4737\" data-end=\"4770\">pe\u00e7as fundidas de alum\u00ednio de alta qualidade<\/td>\n<td data-col-size=\"md\" data-start=\"4770\" data-end=\"4825\">elevada capta\u00e7\u00e3o mas vida \u00fatil mais curta, maior queda de press\u00e3o<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"4827\" data-end=\"4912\"><em data-start=\"4827\" data-end=\"4874\">Quadro 2: Op\u00e7\u00f5es de PPI e principais solu\u00e7\u00f5es de compromisso.<\/em><\/p>\n<p data-start=\"4914\" data-end=\"5112\">Muitas fundi\u00e7\u00f5es padronizam os filtros de 50-70 PPI para alum\u00ednio quando o acabamento da superf\u00edcie e as propriedades mec\u00e2nicas s\u00e3o priorit\u00e1rios. Os filtros PPI mais baixos s\u00e3o utilizados quando o rendimento e a perda m\u00ednima de press\u00e3o s\u00e3o importantes.<\/p>\n<h2 data-start=\"5114\" data-end=\"5139\">M\u00e9todos de produ\u00e7\u00e3o<\/h2>\n<h3 data-start=\"5141\" data-end=\"5174\">T\u00e9cnica de r\u00e9plica de pol\u00edmero<\/h3>\n<p data-start=\"5176\" data-end=\"5259\">O m\u00e9todo industrial dominante envolve um modelo de espuma de pol\u00edmero reticulado. Etapas:<\/p>\n<ol data-start=\"5260\" data-end=\"5638\">\n<li data-start=\"5260\" data-end=\"5321\">\n<p data-start=\"5263\" data-end=\"5321\">selecionar espuma de pol\u00edmero de c\u00e9lulas abertas com a densidade celular necess\u00e1ria<\/p>\n<\/li>\n<li data-start=\"5322\" data-end=\"5401\">\n<p data-start=\"5325\" data-end=\"5401\">mergulhar a espuma numa pasta cer\u00e2mica contendo p\u00f3, aglutinante e dispersante<\/p>\n<\/li>\n<li data-start=\"5402\" data-end=\"5451\">\n<p data-start=\"5405\" data-end=\"5451\">remover o excesso de lama por compress\u00e3o ou rolos<\/p>\n<\/li>\n<li data-start=\"5452\" data-end=\"5501\">\n<p data-start=\"5455\" data-end=\"5501\">secar o modelo revestido para formar um corpo verde<\/p>\n<\/li>\n<li data-start=\"5502\" data-end=\"5574\">\n<p data-start=\"5505\" data-end=\"5574\">queimar o aglutinante de pol\u00edmero num aquecimento controlado para evitar a forma\u00e7\u00e3o de fissuras<\/p>\n<\/li>\n<li data-start=\"5575\" data-end=\"5638\">\n<p data-start=\"5578\" data-end=\"5638\">sinterizar o esqueleto cer\u00e2mico para obter resist\u00eancia e porosidade<\/p>\n<\/li>\n<\/ol>\n<p data-start=\"5640\" data-end=\"5810\">Esta rota produz uma geometria de poro consistente que reflecte o modelo. Muitas patentes e documentos da ind\u00fastria descrevem os passos em pormenor.<\/p>\n<h3 data-start=\"5812\" data-end=\"5851\">Espuma direta e outras vias<\/h3>\n<p data-start=\"5853\" data-end=\"6100\">Os investigadores tamb\u00e9m criam espumas cer\u00e2micas atrav\u00e9s da forma\u00e7\u00e3o direta de espuma de suspens\u00f5es cer\u00e2micas ou utilizando part\u00edculas sacrificiais que se vaporizam durante a cozedura. Estas vias podem ajustar a microestrutura das escoras, mas continuam a ser menos comuns no fabrico de filtros de fundi\u00e7\u00e3o de grande volume.<\/p>\n<h3 data-start=\"6102\" data-end=\"6143\">Controlos de qualidade durante o fabrico<\/h3>\n<ul data-start=\"6145\" data-end=\"6415\">\n<li data-start=\"6145\" data-end=\"6186\">\n<p data-start=\"6147\" data-end=\"6186\">medi\u00e7\u00e3o da retra\u00e7\u00e3o ap\u00f3s sinteriza\u00e7\u00e3o<\/p>\n<\/li>\n<li data-start=\"6187\" data-end=\"6266\">\n<p data-start=\"6189\" data-end=\"6266\">verifica\u00e7\u00e3o da porosidade atrav\u00e9s de an\u00e1lise de imagem ou porosimetria de intrus\u00e3o de merc\u00fario<\/p>\n<\/li>\n<li data-start=\"6267\" data-end=\"6296\">\n<p data-start=\"6269\" data-end=\"6296\">ciclos de ensaio de choque t\u00e9rmico<\/p>\n<\/li>\n<li data-start=\"6297\" data-end=\"6347\">\n<p data-start=\"6299\" data-end=\"6347\">controlos de resist\u00eancia mec\u00e2nica (resist\u00eancia ao esmagamento)<\/p>\n<\/li>\n<li data-start=\"6348\" data-end=\"6415\">\n<p data-start=\"6350\" data-end=\"6415\">ensaios de permeabilidade e queda de press\u00e3o a caudais representativos<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"6417\" data-end=\"6478\"><em data-start=\"6417\" data-end=\"6478\">O quadro 3 compara a r\u00e9plica do pol\u00edmero com a espuma\u00e7\u00e3o direta.<\/em><\/p>\n<div class=\"_tableContainer_1rjym_1\">\n<div class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"6480\" data-end=\"6774\">\n<thead data-start=\"6480\" data-end=\"6533\">\n<tr data-start=\"6480\" data-end=\"6533\">\n<th data-start=\"6480\" data-end=\"6497\" data-col-size=\"sm\">carater\u00edstica<\/th>\n<th data-start=\"6497\" data-end=\"6515\" data-col-size=\"sm\">r\u00e9plica em pol\u00edmero<\/th>\n<th data-start=\"6515\" data-end=\"6533\" data-col-size=\"sm\">espuma\u00e7\u00e3o direta<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"6549\" data-end=\"6774\">\n<tr data-start=\"6549\" data-end=\"6586\">\n<td data-start=\"6549\" data-end=\"6567\" data-col-size=\"sm\">uniformidade dos poros<\/td>\n<td data-col-size=\"sm\" data-start=\"6567\" data-end=\"6574\">elevado<\/td>\n<td data-col-size=\"sm\" data-start=\"6574\" data-end=\"6586\">moderado<\/td>\n<\/tr>\n<tr data-start=\"6587\" data-end=\"6627\">\n<td data-start=\"6587\" data-end=\"6601\" data-col-size=\"sm\">escalabilidade<\/td>\n<td data-col-size=\"sm\" data-start=\"6601\" data-end=\"6613\">excelente<\/td>\n<td data-col-size=\"sm\" data-start=\"6613\" data-end=\"6627\">em desenvolvimento<\/td>\n<\/tr>\n<tr data-start=\"6628\" data-end=\"6667\">\n<td data-start=\"6628\" data-end=\"6644\" data-col-size=\"sm\">custo por unidade<\/td>\n<td data-col-size=\"sm\" data-start=\"6644\" data-end=\"6655\">moderado<\/td>\n<td data-col-size=\"sm\" data-start=\"6655\" data-end=\"6667\">vari\u00e1vel<\/td>\n<\/tr>\n<tr data-start=\"6668\" data-end=\"6728\">\n<td data-start=\"6668\" data-end=\"6698\" data-col-size=\"sm\">controlo da porosidade da escora<\/td>\n<td data-col-size=\"sm\" data-start=\"6698\" data-end=\"6708\">limitado<\/td>\n<td data-col-size=\"sm\" data-start=\"6708\" data-end=\"6728\">maior potencial<\/td>\n<\/tr>\n<tr data-start=\"6729\" data-end=\"6774\">\n<td data-start=\"6729\" data-end=\"6757\" data-col-size=\"sm\">comum em filtros de fundi\u00e7\u00e3o<\/td>\n<td data-col-size=\"sm\" data-start=\"6757\" data-end=\"6763\">sim<\/td>\n<td data-col-size=\"sm\" data-start=\"6763\" data-end=\"6774\">limitado<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"6776\" data-end=\"6855\"><em data-start=\"6776\" data-end=\"6815\">Quadro 3: compara\u00e7\u00e3o dos itiner\u00e1rios de produ\u00e7\u00e3o.<\/em><\/p>\n<h2 data-start=\"6857\" data-end=\"6895\">M\u00e9tricas de desempenho e testes<\/h2>\n<p data-start=\"6897\" data-end=\"6929\">O desempenho \u00e9 comunicado atrav\u00e9s de:<\/p>\n<ul data-start=\"6930\" data-end=\"7236\">\n<li data-start=\"6930\" data-end=\"7006\">\n<p data-start=\"6932\" data-end=\"7006\"><strong data-start=\"6932\" data-end=\"6957\">efici\u00eancia de filtragem<\/strong>Percentagem de part\u00edculas removidas por classe de tamanho.<\/p>\n<\/li>\n<li data-start=\"7007\" data-end=\"7076\">\n<p data-start=\"7009\" data-end=\"7076\"><strong data-start=\"7009\" data-end=\"7026\">queda de press\u00e3o<\/strong>: perda de carga atrav\u00e9s do filtro a um caudal definido.<\/p>\n<\/li>\n<li data-start=\"7077\" data-end=\"7157\">\n<p data-start=\"7079\" data-end=\"7157\"><strong data-start=\"7079\" data-end=\"7103\">integridade mec\u00e2nica<\/strong>resist\u00eancia \u00e0 fissura\u00e7\u00e3o durante o manuseamento e o vazamento.<\/p>\n<\/li>\n<li data-start=\"7158\" data-end=\"7236\">\n<p data-start=\"7160\" data-end=\"7236\"><strong data-start=\"7160\" data-end=\"7188\">resist\u00eancia ao choque t\u00e9rmico<\/strong>N\u00famero de ciclos de aquecimento tolerados antes da falha.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"7238\" data-end=\"7508\">Existem protocolos laboratoriais para medir estes par\u00e2metros. Os testes t\u00edpicos utilizam equipamentos de fluxo met\u00e1lico simulado ou equipamentos \u00e0 escala que reproduzem a temperatura e a velocidade de vazamento. A porosimetria por intrus\u00e3o de merc\u00fario mede a distribui\u00e7\u00e3o interna dos poros.<\/p>\n<h2 data-start=\"7510\" data-end=\"7558\">Vantagens e limita\u00e7\u00f5es<\/h2>\n<h3 data-start=\"7560\" data-end=\"7576\">Benef\u00edcios<\/h3>\n<ul data-start=\"7578\" data-end=\"7832\">\n<li data-start=\"7578\" data-end=\"7630\">\n<p data-start=\"7580\" data-end=\"7630\">maior rendimento de fundi\u00e7\u00e3o com menos pe\u00e7as de refugo.<\/p>\n<\/li>\n<li data-start=\"7631\" data-end=\"7706\">\n<p data-start=\"7633\" data-end=\"7706\">capacidade de reter inclus\u00f5es grandes e pequenas num \u00fanico elemento.<\/p>\n<\/li>\n<li data-start=\"7707\" data-end=\"7787\">\n<p data-start=\"7709\" data-end=\"7787\">l\u00f3gica de filtragem reutiliz\u00e1vel em todas as linhas de fundi\u00e7\u00e3o com passos de substitui\u00e7\u00e3o simples.<\/p>\n<\/li>\n<li data-start=\"7788\" data-end=\"7832\">\n<p data-start=\"7790\" data-end=\"7832\">desempenho est\u00e1vel a temperaturas de fundi\u00e7\u00e3o.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"7834\" data-end=\"7853\">Restri\u00e7\u00f5es<\/h3>\n<ul data-start=\"7855\" data-end=\"8144\">\n<li data-start=\"7855\" data-end=\"7923\">\n<p data-start=\"7857\" data-end=\"7923\">risco de entupimento quando a massa fundida cont\u00e9m cargas elevadas de inclus\u00e3o ou lamas.<\/p>\n<\/li>\n<li data-start=\"7924\" data-end=\"8000\">\n<p data-start=\"7926\" data-end=\"8000\">maior queda de press\u00e3o para filtros de pequeno di\u00e2metro que podem exigir vazamentos mais lentos.<\/p>\n<\/li>\n<li data-start=\"8001\" data-end=\"8069\">\n<p data-start=\"8003\" data-end=\"8069\">custo versus filtros planos mais simples para trabalhos de baixa especifica\u00e7\u00e3o.<\/p>\n<\/li>\n<li data-start=\"8070\" data-end=\"8144\">\n<p data-start=\"8072\" data-end=\"8144\">potenciais reac\u00e7\u00f5es qu\u00edmicas quando o material errado entra em contacto com certas ligas.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"8146\" data-end=\"8231\">Utilizar a heur\u00edstica de sele\u00e7\u00e3o para equilibrar a efici\u00eancia da capta\u00e7\u00e3o com uma queda de press\u00e3o aceit\u00e1vel.<\/p>\n<h2 data-start=\"8233\" data-end=\"8275\">Casos de aplica\u00e7\u00e3o e alvos met\u00e1licos<\/h2>\n<p data-start=\"8277\" data-end=\"8328\">Os filtros de espuma cer\u00e2mica s\u00e3o amplamente utilizados em todos os metais:<\/p>\n<ul data-start=\"8330\" data-end=\"8811\">\n<li data-start=\"8330\" data-end=\"8536\">\n<p data-start=\"8332\" data-end=\"8536\"><strong data-start=\"8332\" data-end=\"8351\">Ligas de alum\u00ednio<\/strong>: alvo principal para filtros de alumina e f\u00f3rmulas h\u00edbridas. Os filtros finos de PPI melhoram a qualidade da superf\u00edcie de pe\u00e7as para autom\u00f3veis e caixas electr\u00f3nicas.<\/p>\n<\/li>\n<li data-start=\"8537\" data-end=\"8645\">\n<p data-start=\"8539\" data-end=\"8645\"><strong data-start=\"8539\" data-end=\"8569\">Ferro fundido e ferro fundido d\u00factil<\/strong>: As cer\u00e2micas de SiC ou com liga\u00e7\u00f5es de carbono funcionam bem para vazamentos de ferro a alta temperatura.<\/p>\n<\/li>\n<li data-start=\"8646\" data-end=\"8811\">\n<p data-start=\"8648\" data-end=\"8811\"><strong data-start=\"8648\" data-end=\"8682\">A\u00e7o fundido e a\u00e7o inoxid\u00e1vel<\/strong>: as misturas de zirc\u00f3nio ou de alta alumina suportam temperaturas extremas e produtos qu\u00edmicos agressivos.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"8813\" data-end=\"9064\">As configura\u00e7\u00f5es t\u00edpicas de fundi\u00e7\u00e3o colocam o filtro dentro de uma caixa de filtro de cer\u00e2mica, um canal ou um copo de vazamento. Os sistemas de escorva electromagn\u00e9tica s\u00e3o ocasionalmente combinados com filtros de espuma para melhorar a humidifica\u00e7\u00e3o do metal e a escorva do filtro.<\/p>\n<h2 data-start=\"9066\" data-end=\"9110\">Lista de verifica\u00e7\u00e3o de sele\u00e7\u00e3o<\/h2>\n<p data-start=\"9112\" data-end=\"9154\">Ao escolher um filtro, tenha em conta estes aspectos:<\/p>\n<ol data-start=\"9155\" data-end=\"9449\">\n<li data-start=\"9155\" data-end=\"9196\">\n<p data-start=\"9158\" data-end=\"9196\">qu\u00edmica do metal e temperatura de vazamento.<\/p>\n<\/li>\n<li data-start=\"9197\" data-end=\"9244\">\n<p data-start=\"9200\" data-end=\"9244\">acabamento de superf\u00edcie desejado e objectivos de toler\u00e2ncia.<\/p>\n<\/li>\n<li data-start=\"9245\" data-end=\"9284\">\n<p data-start=\"9248\" data-end=\"9284\">tipos e tamanhos de inclus\u00e3o previstos.<\/p>\n<\/li>\n<li data-start=\"9285\" data-end=\"9334\">\n<p data-start=\"9288\" data-end=\"9334\">caudal pretendido e queda de press\u00e3o admiss\u00edvel.<\/p>\n<\/li>\n<li data-start=\"9335\" data-end=\"9393\">\n<p data-start=\"9338\" data-end=\"9393\">espessura e pegada do filtro que se adaptam \u00e0 conce\u00e7\u00e3o da porta.<\/p>\n<\/li>\n<li data-start=\"9394\" data-end=\"9449\">\n<p data-start=\"9397\" data-end=\"9449\">certificados de qualidade dos fornecedores e rastreabilidade dos lotes.<\/p>\n<\/li>\n<\/ol>\n<p data-start=\"9451\" data-end=\"9544\">Utilizar pequenos ensaios com pe\u00e7as de amostra para confirmar o melhor PPI e material antes da ado\u00e7\u00e3o total.<\/p>\n<h2 data-start=\"9546\" data-end=\"9594\">Instala\u00e7\u00e3o, manuseamento e melhores pr\u00e1ticas<\/h2>\n<ul data-start=\"9596\" data-end=\"10003\">\n<li data-start=\"9596\" data-end=\"9663\">\n<p data-start=\"9598\" data-end=\"9663\">armazenar os filtros num ambiente seco e est\u00e1vel para evitar a contamina\u00e7\u00e3o.<\/p>\n<\/li>\n<li data-start=\"9664\" data-end=\"9730\">\n<p data-start=\"9666\" data-end=\"9730\">manusear com luvas para evitar lascar; a cer\u00e2mica pode ser quebradi\u00e7a.<\/p>\n<\/li>\n<li data-start=\"9731\" data-end=\"9862\">\n<p data-start=\"9733\" data-end=\"9862\">escorvar o filtro quando o sistema de vazamento o exigir; a escorva aumenta a efic\u00e1cia da capta\u00e7\u00e3o, assegurando a humidifica\u00e7\u00e3o completa das escoras internas.<\/p>\n<\/li>\n<li data-start=\"9863\" data-end=\"9932\">\n<p data-start=\"9865\" data-end=\"9932\">inspecionar as caixas de filtros e as juntas para detetar fugas que causem um fluxo de deriva\u00e7\u00e3o.<\/p>\n<\/li>\n<li data-start=\"9933\" data-end=\"10003\">\n<p data-start=\"9935\" data-end=\"10003\">substituir os filtros a intervalos especificados ou ap\u00f3s qualquer sinal de fissura\u00e7\u00e3o.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"10005\" data-end=\"10142\">Em muitas linhas de produ\u00e7\u00e3o, os filtros encontram-se dentro de caixas de filtros descart\u00e1veis que protegem o bloco de danos mec\u00e2nicos e facilitam a instala\u00e7\u00e3o.<\/p>\n<h2 data-start=\"10144\" data-end=\"10182\">Resolu\u00e7\u00e3o de problemas comuns<\/h2>\n<h3 data-start=\"10184\" data-end=\"10210\">Entupimento prematuro<\/h3>\n<p data-start=\"10212\" data-end=\"10220\">Raz\u00f5es:<\/p>\n<ul data-start=\"10221\" data-end=\"10341\">\n<li data-start=\"10221\" data-end=\"10261\">\n<p data-start=\"10223\" data-end=\"10261\">carga de inclus\u00e3o excessiva na massa fundida<\/p>\n<\/li>\n<li data-start=\"10262\" data-end=\"10294\">\n<p data-start=\"10264\" data-end=\"10294\">PPI incorreto para o tamanho da inclus\u00e3o.<\/p>\n<\/li>\n<li data-start=\"10295\" data-end=\"10341\">\n<p data-start=\"10297\" data-end=\"10341\">fus\u00e3o incompleta ou desnata\u00e7\u00e3o deficiente a montante.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"10343\" data-end=\"10351\">Ac\u00e7\u00f5es:<\/p>\n<ul data-start=\"10352\" data-end=\"10486\">\n<li data-start=\"10352\" data-end=\"10396\">\n<p data-start=\"10354\" data-end=\"10396\">aumentar o PPI se as inclus\u00f5es finas forem predominantes.<\/p>\n<\/li>\n<li data-start=\"10397\" data-end=\"10442\">\n<p data-start=\"10399\" data-end=\"10442\">melhorar a limpeza da massa fundida antes da filtra\u00e7\u00e3o.<\/p>\n<\/li>\n<li data-start=\"10443\" data-end=\"10486\">\n<p data-start=\"10445\" data-end=\"10486\">velocidade de vazamento lenta para reduzir a queda de press\u00e3o.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"10488\" data-end=\"10511\">Rutura do filtro<\/h3>\n<p data-start=\"10513\" data-end=\"10521\">Raz\u00f5es:<\/p>\n<ul data-start=\"10522\" data-end=\"10603\">\n<li data-start=\"10522\" data-end=\"10567\">\n<p data-start=\"10524\" data-end=\"10567\">choque t\u00e9rmico de metal frio ou salpicos.<\/p>\n<\/li>\n<li data-start=\"10568\" data-end=\"10603\">\n<p data-start=\"10570\" data-end=\"10603\">impacto mec\u00e2nico durante o manuseamento.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"10605\" data-end=\"10613\">Ac\u00e7\u00f5es:<\/p>\n<ul data-start=\"10614\" data-end=\"10720\">\n<li data-start=\"10614\" data-end=\"10675\">\n<p data-start=\"10616\" data-end=\"10675\">pr\u00e9-aquecer ligeiramente as caixas de filtros quando se verte metal muito quente.<\/p>\n<\/li>\n<li data-start=\"10676\" data-end=\"10720\">\n<p data-start=\"10678\" data-end=\"10720\">rever as etapas de manuseamento para amortecer o bloqueio.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"10722\" data-end=\"10757\">Fluxo de deriva\u00e7\u00e3o ou capta\u00e7\u00e3o deficiente<\/h3>\n<p data-start=\"10759\" data-end=\"10767\">Raz\u00f5es:<\/p>\n<ul data-start=\"10768\" data-end=\"10867\">\n<li data-start=\"10768\" data-end=\"10822\">\n<p data-start=\"10770\" data-end=\"10822\">veda\u00e7\u00e3o incorrecta ou junta danificada na caixa do filtro.<\/p>\n<\/li>\n<li data-start=\"10823\" data-end=\"10867\">\n<p data-start=\"10825\" data-end=\"10867\">o trajeto do fluxo encontra lacunas nos bordos do filtro.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"10869\" data-end=\"10877\">Ac\u00e7\u00f5es:<\/p>\n<ul data-start=\"10878\" data-end=\"10932\">\n<li data-start=\"10878\" data-end=\"10932\">\n<p data-start=\"10880\" data-end=\"10932\">inspecionar a montagem, voltar a colocar o filtro, substituir a caixa danificada.<\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"10934\" data-end=\"10980\">Considera\u00e7\u00f5es ambientais e de seguran\u00e7a<\/h2>\n<p data-start=\"10982\" data-end=\"11276\">Os blocos de espuma cer\u00e2mica s\u00e3o inertes ap\u00f3s a sinteriza\u00e7\u00e3o. A fase de fabrico que remove o modelo de pol\u00edmero produz produtos de combust\u00e3o que requerem ventila\u00e7\u00e3o e filtragem adequadas. Os res\u00edduos da sinteriza\u00e7\u00e3o e os filtros partidos devem ser recolhidos e reciclados sempre que poss\u00edvel, de acordo com a regulamenta\u00e7\u00e3o local.<\/p>\n<p data-start=\"11278\" data-end=\"11447\">Os operadores de fundi\u00e7\u00e3o devem usar EPI normalizado durante o manuseamento e vazamento, incluindo luvas resistentes ao calor, prote\u00e7\u00e3o ocular e prote\u00e7\u00e3o respirat\u00f3ria quando h\u00e1 presen\u00e7a de poeiras.<\/p>\n<h2 data-start=\"11449\" data-end=\"11475\">V\u00eddeo de demonstra\u00e7\u00e3o<\/h2>\n<p data-start=\"11477\" data-end=\"11775\">Um v\u00eddeo claro da f\u00e1brica que percorra os passos de produ\u00e7\u00e3o da r\u00e9plica de pol\u00edmero e mostre as pe\u00e7as finais em ensaios de vazamento \u00e9 \u00fatil para as equipas que implementam filtros pela primeira vez. O clip seguinte oferece uma vis\u00e3o pr\u00e1tica do fabrico e da utiliza\u00e7\u00e3o b\u00e1sica.<\/p>\n<p><iframe title=\"Leitor de v\u00eddeo do YouTube\" src=\"https:\/\/www.youtube.com\/embed\/4mA_MJl-Oy4?si=PdSR3fQWZOXtl6JM\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h2 data-start=\"11898\" data-end=\"11933\">Notas e normas de fornecedores<\/h2>\n<p data-start=\"11935\" data-end=\"11967\">Ao selecionar um fornecedor, verifique:<\/p>\n<ul data-start=\"11968\" data-end=\"12186\">\n<li data-start=\"11968\" data-end=\"12026\">\n<p data-start=\"11970\" data-end=\"12026\">certificados de materiais para qu\u00edmica e refractariedade<\/p>\n<\/li>\n<li data-start=\"12027\" data-end=\"12080\">\n<p data-start=\"12029\" data-end=\"12080\">relat\u00f3rios de ensaios de classifica\u00e7\u00e3o dos poros e valores de permeabilidade<\/p>\n<\/li>\n<li data-start=\"12081\" data-end=\"12126\">\n<p data-start=\"12083\" data-end=\"12126\">rastreabilidade dos lotes e protocolos de amostragem<\/p>\n<\/li>\n<li data-start=\"12127\" data-end=\"12186\">\n<p data-start=\"12129\" data-end=\"12186\">embalagem que evite danos mec\u00e2nicos durante o transporte<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"12188\" data-end=\"12343\">Muitos fornecedores publicam n\u00fameros t\u00edpicos de permeabilidade, porosidade e resist\u00eancia \u00e0 compress\u00e3o. A compara\u00e7\u00e3o destes valores ajuda a fazer corresponder um filtro a uma determinada linha de fundi\u00e7\u00e3o.<\/p>\n<h2 data-start=\"12345\" data-end=\"12415\">Breve aprofundamento t\u00e9cnico - geometria dos poros, microestrutura das escoras<\/h2>\n<p data-start=\"12417\" data-end=\"12486\">Os filtros de espuma cer\u00e2mica cont\u00eam duas escalas de comprimento que afectam o desempenho:<\/p>\n<ol data-start=\"12487\" data-end=\"12636\">\n<li data-start=\"12487\" data-end=\"12563\">\n<p data-start=\"12490\" data-end=\"12563\">o n\u00edvel da rede celular que define os poros macrosc\u00f3picos e os canais de fluxo<\/p>\n<\/li>\n<li data-start=\"12564\" data-end=\"12636\">\n<p data-start=\"12567\" data-end=\"12636\">a microestrutura da escora que inclui nanoporos e limites de gr\u00e3o<\/p>\n<\/li>\n<\/ol>\n<p data-start=\"12638\" data-end=\"12980\">Os fabricantes controlam a porosidade das escoras atrav\u00e9s da dimens\u00e3o das part\u00edculas de p\u00f3 e da temperatura de sinteriza\u00e7\u00e3o. A intrus\u00e3o de merc\u00fario ou a picnometria de g\u00e1s podem revelar a distribui\u00e7\u00e3o dos tamanhos dos poros no interior dos suportes e nas janelas das c\u00e9lulas. Este conhecimento ajuda a prever a captura de part\u00edculas finas e a resist\u00eancia ao choque t\u00e9rmico.<\/p>\n<h2 data-start=\"12982\" data-end=\"13023\">Estudo de caso<\/h2>\n<p data-start=\"13025\" data-end=\"13170\">Uma fundi\u00e7\u00e3o autom\u00f3vel m\u00e9dia mudou de filtros planos de cer\u00e2mica para filtros de espuma de alumina de 50 PPI para suportes de motor em alum\u00ednio. Resultado ap\u00f3s 3 meses:<\/p>\n<ul data-start=\"13171\" data-end=\"13325\">\n<li data-start=\"13171\" data-end=\"13207\">\n<p data-start=\"13173\" data-end=\"13207\">a taxa de refugo caiu 22%.<\/p>\n<\/li>\n<li data-start=\"13208\" data-end=\"13264\">\n<p data-start=\"13210\" data-end=\"13264\">o retrabalho devido \u00e0 porosidade da superf\u00edcie diminuiu 45%.<\/p>\n<\/li>\n<li data-start=\"13265\" data-end=\"13325\">\n<p data-start=\"13267\" data-end=\"13325\">rendimento mantido com um pequeno ajuste na velocidade de vazamento.<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"13327\" data-end=\"13427\">Este caso mostra como os ganhos de desempenho compensam o custo mais elevado do filtro por pe\u00e7a em componentes de elevada especifica\u00e7\u00e3o.<\/p>\n<h2 data-start=\"13429\" data-end=\"13481\">Refer\u00eancia r\u00e1pida da sele\u00e7\u00e3o<\/h2>\n<ol data-start=\"13483\" data-end=\"13816\">\n<li data-start=\"13483\" data-end=\"13523\">\n<p data-start=\"13486\" data-end=\"13523\">confirmar o tipo de metal e a temperatura<\/p>\n<\/li>\n<li data-start=\"13524\" data-end=\"13584\">\n<p data-start=\"13527\" data-end=\"13584\">estimar a distribui\u00e7\u00e3o do tamanho das inclus\u00f5es a partir de an\u00e1lises de fus\u00e3o<\/p>\n<\/li>\n<li data-start=\"13585\" data-end=\"13653\">\n<p data-start=\"13588\" data-end=\"13653\">escolher uma qu\u00edmica de material que resista \u00e0 rea\u00e7\u00e3o com essa liga<\/p>\n<\/li>\n<li data-start=\"13654\" data-end=\"13744\">\n<p data-start=\"13657\" data-end=\"13744\">escolher o PPI com base no acabamento pretendido: PPI mais elevado para um acabamento fino, PPI mais baixo para uma vida longa<\/p>\n<\/li>\n<li data-start=\"13745\" data-end=\"13816\">\n<p data-start=\"13748\" data-end=\"13816\">executar vazamentos lado a lado e inspecionar a microestrutura e o acabamento da superf\u00edcie<\/p>\n<\/li>\n<\/ol>\n<h2 data-start=\"13818\" data-end=\"13850\">Manuten\u00e7\u00e3o e ciclo de vida<\/h2>\n<p data-start=\"13852\" data-end=\"14139\">Os filtros de espuma cer\u00e2mica s\u00e3o elementos de utiliza\u00e7\u00e3o \u00fanica na maioria das opera\u00e7\u00f5es de fundi\u00e7\u00e3o. A elimina\u00e7\u00e3o correta come\u00e7a com a recolha dos filtros usados ap\u00f3s o arrefecimento. As rotas de reciclagem dependem das instala\u00e7\u00f5es locais e da qu\u00edmica da cer\u00e2mica. Os filtros partidos durante o manuseamento diminuem a efici\u00eancia do ciclo de vida e aumentam o custo.<\/p>\n<h2 data-start=\"14141\" data-end=\"14172\">Mitos e esclarecimentos<\/h2>\n<ul data-start=\"14174\" data-end=\"14511\">\n<li data-start=\"14174\" data-end=\"14329\">\n<p data-start=\"14176\" data-end=\"14329\"><strong data-start=\"14176\" data-end=\"14185\">mito:<\/strong> um filtro para cada fundi\u00e7\u00e3o.<br data-start=\"14216\" data-end=\"14219\" \/><strong data-start=\"14221\" data-end=\"14233\">realidade:<\/strong> cada geometria de fundi\u00e7\u00e3o e cada liga requer uma afina\u00e7\u00e3o do filtro.<\/p>\n<\/li>\n<li data-start=\"14331\" data-end=\"14511\">\n<p data-start=\"14333\" data-end=\"14511\"><strong data-start=\"14333\" data-end=\"14342\">mito:<\/strong> Poros mais pequenos significam sempre melhores resultados.<br data-start=\"14384\" data-end=\"14387\" \/><strong data-start=\"14389\" data-end=\"14401\">realidade:<\/strong> os poros mais pequenos podem provocar um entupimento r\u00e1pido e uma elevada queda de press\u00e3o; a sele\u00e7\u00e3o deve equilibrar a captura com o caudal.<\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"14513\" data-end=\"14549\">Contexto regulamentar e de patentes<\/h2>\n<p data-start=\"14551\" data-end=\"14858\">As primeiras patentes estabelecem os par\u00e2metros de refer\u00eancia de porosidade e permeabilidade ao ar utilizados nos produtos modernos. Os registos de patentes modernos descrevem composi\u00e7\u00f5es mistas de SiC, ZrO\u2082 e s\u00edlica para adaptar a resist\u00eancia qu\u00edmica e a for\u00e7a. Verifique as notas de IP do fornecedor se for necess\u00e1ria uma mistura de material espec\u00edfica.<\/p>\n<h2 data-start=\"14860\" data-end=\"14913\">N\u00fameros de desempenho estimados (intervalos t\u00edpicos)<\/h2>\n<ul data-start=\"14915\" data-end=\"15098\">\n<li data-start=\"14915\" data-end=\"14948\">\n<p data-start=\"14917\" data-end=\"14948\">porosidade: 0,75-0,95 por volume<\/p>\n<\/li>\n<li data-start=\"14949\" data-end=\"15030\">\n<p data-start=\"14951\" data-end=\"15030\">permeabilidade: 400 a 8000 \u00d7 10-\u2077 cm\u00b2 (depende do material e da estrutura dos poros)<\/p>\n<\/li>\n<li data-start=\"15031\" data-end=\"15098\">\n<p data-start=\"15033\" data-end=\"15098\">espessura recomendada: 12-100 mm consoante a aplica\u00e7\u00e3o e o PPI<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"15100\" data-end=\"15212\">Estas gamas ajudam a interpretar as fichas de dados do fornecedor quando se comparam op\u00e7\u00f5es.<\/p>\n<h2 data-start=\"15214\" data-end=\"15261\">Perguntas frequentes<\/h2>\n<ol data-start=\"15263\" data-end=\"17173\">\n<li data-start=\"15263\" data-end=\"15501\">\n<p data-start=\"15266\" data-end=\"15501\"><strong data-start=\"15266\" data-end=\"15323\">Que tamanhos de part\u00edculas podem ser removidos por um filtro de espuma de cer\u00e2mica?<\/strong><br data-start=\"15323\" data-end=\"15326\" \/>Os filtros removem uma vasta gama. As grandes inclus\u00f5es bloqueiam perto da face. As part\u00edculas finas alojam-se mais profundamente na porosidade da escora. O corte efetivo depende do PPI e da velocidade do fluxo.<\/p>\n<\/li>\n<li data-start=\"15503\" data-end=\"15652\">\n<p data-start=\"15506\" data-end=\"15652\"><strong data-start=\"15506\" data-end=\"15549\">Os filtros de espuma de cer\u00e2mica funcionam para o a\u00e7o?<\/strong><br data-start=\"15549\" data-end=\"15552\" \/>Sim. Utilize produtos qu\u00edmicos de alta temperatura, tais como misturas de zirc\u00f3nio ou carboneto de sil\u00edcio para vazamentos de a\u00e7o.<\/p>\n<\/li>\n<li data-start=\"15654\" data-end=\"15850\">\n<p data-start=\"15657\" data-end=\"15850\"><strong data-start=\"15657\" data-end=\"15704\">Um filtro pode derreter ou partir-se dentro do molde?<\/strong><br data-start=\"15704\" data-end=\"15707\" \/>As cer\u00e2micas sinterizadas toleram as temperaturas t\u00edpicas de fundi\u00e7\u00e3o. A rutura \u00e9 normalmente mec\u00e2nica ou devida a choque t\u00e9rmico por desfasamento de temperaturas.<\/p>\n<\/li>\n<li data-start=\"15852\" data-end=\"16043\">\n<p data-start=\"15855\" data-end=\"16043\"><strong data-start=\"15855\" data-end=\"15903\">Como \u00e9 que escolho o PPI para uma fundi\u00e7\u00e3o de alum\u00ednio?<\/strong><br data-start=\"15903\" data-end=\"15906\" \/>Comece com 50 PPI para necessidades de acabamento elevado. Efectue ensaios com 40 PPI e 60 PPI para encontrar a melhor rela\u00e7\u00e3o entre vida \u00fatil e qualidade da superf\u00edcie.<\/p>\n<\/li>\n<li data-start=\"16045\" data-end=\"16236\">\n<p data-start=\"16048\" data-end=\"16236\"><strong data-start=\"16048\" data-end=\"16080\">\u00c9 necess\u00e1rio escorvar o filtro?<\/strong><br data-start=\"16080\" data-end=\"16083\" \/>A escorva ajuda a humedecer os suportes internos e evita a forma\u00e7\u00e3o de bolsas de ar. Muitas fundi\u00e7\u00f5es preparam os filtros utilizando um fluxo de metal controlado ou uma prepara\u00e7\u00e3o electromagn\u00e9tica.<\/p>\n<\/li>\n<li data-start=\"16238\" data-end=\"16409\">\n<p data-start=\"16241\" data-end=\"16409\"><strong data-start=\"16241\" data-end=\"16281\">Um filtro pode remover gases dissolvidos?<\/strong><br data-start=\"16281\" data-end=\"16284\" \/>N\u00e3o. Os filtros de espuma ret\u00eam inclus\u00f5es de part\u00edculas e \u00f3xidos. O hidrog\u00e9nio dissolvido ou outros gases requerem m\u00e9todos de tratamento da fus\u00e3o.<\/p>\n<\/li>\n<li data-start=\"16411\" data-end=\"16606\">\n<p data-start=\"16414\" data-end=\"16606\"><strong data-start=\"16414\" data-end=\"16454\">Quanto tempo dura um filtro de cer\u00e2mica?<\/strong><br data-start=\"16454\" data-end=\"16457\" \/>Os filtros s\u00e3o de utiliza\u00e7\u00e3o \u00fanica para tarefas de enchimento. O tempo de vida \u00fatil significa um servi\u00e7o eficaz durante um \u00fanico derrame e quaisquer derrames subsequentes imediatos antes de entupir.<\/p>\n<\/li>\n<li data-start=\"16608\" data-end=\"16821\">\n<p data-start=\"16611\" data-end=\"16821\"><strong data-start=\"16611\" data-end=\"16668\">Existem preocupa\u00e7\u00f5es ambientais com os filtros partidos?<\/strong><br data-start=\"16668\" data-end=\"16671\" \/>A cer\u00e2mica sinterizada partida \u00e9 inerte. Os res\u00edduos de produ\u00e7\u00e3o que cont\u00eam pol\u00edmeros queimados requerem um tratamento de ar adequado. Respeitar sempre as regras locais em mat\u00e9ria de res\u00edduos.<\/p>\n<\/li>\n<li data-start=\"16823\" data-end=\"16970\">\n<p data-start=\"16826\" data-end=\"16970\"><strong data-start=\"16826\" data-end=\"16867\">Os filtros de espuma afectam a velocidade de vazamento?<\/strong><br data-start=\"16867\" data-end=\"16870\" \/>Sim. Poros mais pequenos aumentam a queda de press\u00e3o e podem exigir uma redu\u00e7\u00e3o modesta da velocidade de vazamento.<\/p>\n<\/li>\n<li data-start=\"16972\" data-end=\"17173\">\n<p data-start=\"16976\" data-end=\"17173\"><strong data-start=\"16976\" data-end=\"17032\">Onde \u00e9 que os filtros devem ser colocados no sistema de portas?<\/strong><br data-start=\"17032\" data-end=\"17035\" \/>Coloque os filtros no canal ou no copo de vazamento onde o fluxo se estabiliza antes de entrar no molde. Assegurar uma veda\u00e7\u00e3o estanque para evitar o desvio do fluxo.<\/p>\n<\/li>\n<\/ol>\n<h2 data-start=\"17175\" data-end=\"17229\">Lista de controlo para ensaios-piloto em linhas de produ\u00e7\u00e3o<\/h2>\n<ul data-start=\"17231\" data-end=\"17500\">\n<li data-start=\"17231\" data-end=\"17297\">\n<p data-start=\"17233\" data-end=\"17297\">efetuar, pelo menos, tr\u00eas vazamentos por tipo de filtro, com id\u00eantico sistema de gating.<\/p>\n<\/li>\n<li data-start=\"17298\" data-end=\"17383\">\n<p data-start=\"17300\" data-end=\"17383\">inspecionar as pe\u00e7as fundidas quanto ao acabamento da superf\u00edcie, defeitos internos e cupons de ensaio mec\u00e2nico.<\/p>\n<\/li>\n<li data-start=\"17384\" data-end=\"17446\">\n<p data-start=\"17386\" data-end=\"17446\">medir a queda de press\u00e3o no sistema de vazamento para cada ensaio.<\/p>\n<\/li>\n<li data-start=\"17447\" data-end=\"17500\">\n<p data-start=\"17449\" data-end=\"17500\">manter registos por lote para criar um hist\u00f3rico de otimiza\u00e7\u00e3o.<\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"17502\" data-end=\"17530\">Recomenda\u00e7\u00f5es finais<\/h2>\n<ul data-start=\"17532\" data-end=\"17762\">\n<li data-start=\"17532\" data-end=\"17622\">\n<p data-start=\"17534\" data-end=\"17622\">tratar a sele\u00e7\u00e3o de filtros como um pequeno projeto de engenharia e n\u00e3o como uma \u00fanica compra.<\/p>\n<\/li>\n<li data-start=\"17623\" data-end=\"17702\">\n<p data-start=\"17625\" data-end=\"17702\">documentar o PPI, a composi\u00e7\u00e3o do material e os dados de ciclos t\u00e9rmicos dos fornecedores.<\/p>\n<\/li>\n<li data-start=\"17703\" data-end=\"17762\">\n<p data-start=\"17705\" data-end=\"17762\">iniciar ensaios em pe\u00e7as representativas antes da implanta\u00e7\u00e3o total.<\/p>\n<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>A ceramic foam filter is a three-dimensional, open-cell refractory block used to remove nonmetallic inclusions and control metal flow during mold filling. When placed in a gating system, these filters trap oxide skins, dross, sand and other particles while smoothing flow, so final castings show fewer defects, improved mechanical integrity, and higher surface finish. What [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2085,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2084","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Ceramic Foam Filter? 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