{"id":4906,"date":"2020-09-18T08:05:06","date_gmt":"2020-09-18T08:05:06","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4906"},"modified":"2020-09-18T08:05:06","modified_gmt":"2020-09-18T08:05:06","slug":"filtration-efficiency-of-cff","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/filtration-efficiency-of-cff\/","title":{"rendered":"Efici\u00eancia de filtra\u00e7\u00e3o do CFF"},"content":{"rendered":"

Melhorar a efici\u00eancia de filtragem do filtro CFF: uma das formas \u00e9 melhorar a tens\u00e3o interfacial entre a massa fundida e o substrato por meio de revestimento superficial e tratamento de rugosidade superficial, a fim de aumentar a capacidade de adsor\u00e7\u00e3o do filtro em rela\u00e7\u00e3o a inclus\u00f5es espec\u00edficas e reduzir a press\u00e3o inicial do filtro; outra \u00e9 aumentar o tamanho dos macroporos (PPI); ao aumentar os microporos da pr\u00f3pria matriz, obt\u00e9m-se um filtro composto poroso que combina macroporos, mesoporos e microporos.<\/p>\n

Para massas fundidas com part\u00edculas mistas, a fim de evitar que part\u00edculas grandes se acumulem no bolo de filtra\u00e7\u00e3o e bloqueiem os poros prematuramente, pode-se desenvolver um filtro com distribui\u00e7\u00e3o combinada em gradiente de poros. Por exemplo, o m\u00e9todo de imers\u00e3o de precursores org\u00e2nicos e o processo Sol-Gel podem ser combinados para determinar o tamanho dos poros do filtro. A faixa de distribui\u00e7\u00e3o pode atingir 0,02 a 3 mm, a resist\u00eancia pode ser aumentada em 2 a 3 vezes e as inclus\u00f5es com tamanho inferior a 5 \u03bcm podem ser filtradas. Outro exemplo \u00e9 o congelamento unidirecional da pasta cer\u00e2mica \u00e0 base de \u00e1gua pelo m\u00e9todo de liofiliza\u00e7\u00e3o e a sublima\u00e7\u00e3o do gelo em condi\u00e7\u00f5es de v\u00e1cuo e baixa press\u00e3o para formar uma liga\u00e7\u00e3o porosa, o que \u00e9 de baixo custo e ecologicamente correto. Tamb\u00e9m \u00e9 poss\u00edvel adicionar o m\u00e9todo de forma\u00e7\u00e3o de poros, o m\u00e9todo de poros de fibra, o m\u00e9todo de poros por corros\u00e3o por radia\u00e7\u00e3o, o m\u00e9todo de espuma\u00e7\u00e3o com cura in situ da pasta, o m\u00e9todo de deposi\u00e7\u00e3o por infiltra\u00e7\u00e3o de vapor qu\u00edmico, a pir\u00f3lise de espuma org\u00e2nica para gerar pasta de revestimento com esqueleto de carbono, etc. A combina\u00e7\u00e3o do m\u00e9todo de impregna\u00e7\u00e3o com espuma permite a prepara\u00e7\u00e3o de um filtro de alto desempenho com uma combina\u00e7\u00e3o de porosidade, melhorando assim a efici\u00eancia de filtra\u00e7\u00e3o do filtro CFF e a atividade do filtro.<\/p>\n

\"Efici\u00eancia<\/p>\n

Filtro CFF<\/a> N\u00e3o s\u00f3 \u00e9 capaz de remover inclus\u00f5es f\u00edsicas por meio da intercepta\u00e7\u00e3o e adsor\u00e7\u00e3o na superf\u00edcie, como tamb\u00e9m exerce um efeito de purifica\u00e7\u00e3o por solvente. Al\u00e9m dos microporos presentes na matriz, pode atuar como uma peneira molecular para remover compostos intermet\u00e1licos. Tamb\u00e9m \u00e9 capaz de permitir a passagem dos aditivos presentes no material da matriz. Reage com a massa fundida para remover inclus\u00f5es qu\u00edmicas nocivas dissolvidas nela, tais como metais alcalinos, metais alcalino-terrosos e compostos met\u00e1licos.<\/p>\n

Aprofundar a avalia\u00e7\u00e3o da utilidade real do CFF: isso inclui, principalmente, a sele\u00e7\u00e3o da correspond\u00eancia entre o tipo de inclus\u00e3o ou liga e o filtro, o efeito da remo\u00e7\u00e3o de impurezas, a avalia\u00e7\u00e3o do efeito combinado do filtro e de outros m\u00e9todos de purifica\u00e7\u00e3o, bem como a detec\u00e7\u00e3o r\u00e1pida e precisa da efici\u00eancia de filtra\u00e7\u00e3o. Sua base de aplica\u00e7\u00e3o consiste principalmente na realiza\u00e7\u00e3o da avalia\u00e7\u00e3o do desempenho de produtos em altas temperaturas, incluindo propriedades f\u00edsico-qu\u00edmicas em condi\u00e7\u00f5es de alta temperatura, mecanismos de filtra\u00e7\u00e3o, modelos de din\u00e2mica de fluidos, cria\u00e7\u00e3o de bancos de dados, meios de filtra\u00e7\u00e3o e energia superficial do alum\u00ednio fundido, etc. Por meio do estabelecimento de padr\u00f5es de avalia\u00e7\u00e3o abrangentes e eficazes, torna-se poss\u00edvel tornar a aplica\u00e7\u00e3o de filtros mais seletiva e cient\u00edfica.<\/p>","protected":false},"excerpt":{"rendered":"

Improve the filtration efficiency of CFF filter: one is to improve the interfacial tension between the melt and the substrate through surface coating and surface…<\/p>","protected":false},"author":1,"featured_media":4908,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4704],"class_list":["post-4906","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-filtration-efficiency-of-cff"],"yoast_head":"\nFiltration Efficiency of CFF Filter | Filtration Mechanisms<\/title>\n<meta name=\"description\" content=\"Improve the filtration efficiency of CFF filter: one is to improve the interfacial tension between the melt and the substrate...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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