{"id":10661,"date":"2021-10-19T01:36:18","date_gmt":"2021-10-19T01:36:18","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10661"},"modified":"2021-10-19T01:36:18","modified_gmt":"2021-10-19T01:36:18","slug":"foam-ceramic-filter-for-foundries","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/foam-ceramic-filter-for-foundries\/","title":{"rendered":"Filtro cer\u00e2mico de espuma para fundi\u00e7\u00f5es"},"content":{"rendered":"

O filtro cer\u00e2mico de espuma de c\u00e9lula aberta utilizado em fundi\u00e7\u00f5es de alum\u00ednio foi desenvolvido no in\u00edcio da d\u00e9cada de 1970, e a tecnologia foi aplicada comercialmente pela primeira vez em 1974 para produzir lingotes laminados destinados \u00e0 fabrica\u00e7\u00e3o de chapas. Os filtros cer\u00e2micos de espuma s\u00e3o filtros integrados e descart\u00e1veis, utilizados para uma \u00fanica fundi\u00e7\u00e3o. O tamanho dos poros do filtro varia de 4 a 28 orif\u00edcios por cent\u00edmetro (10 a 70 orif\u00edcios por polegada linear), e o tamanho correspondente dos poros \u00e9 de aproximadamente 0,036 a 0,26 cm. Os filtros de espuma cer\u00e2mica s\u00e3o geralmente fabricados em formatos quadrados, com dimens\u00f5es que variam de 22,86 cm \u00d7 22,86 cm \u00d7 5,08 cm (9 polegadas \u00d7 9 polegadas \u00d7 2 polegadas) a 66,04 cm \u00d7 66,04 cm \u00d7 5,08 cm (26 polegadas \u00d7 26 polegadas \u00d7 2 polegadas). As bordas s\u00e3o chanfradas e servem para encaixar em um recipiente de filtro refrat\u00e1rio.<\/p>\n

Uma junta de papel fibroso \u00e9 fixada na borda chanfrada para aplicar uma carga compressiva lateral, a fim de fixar o filtro no recipiente do filtro e impedir que o metal ao redor da borda do filtro passe por ele. O material de suporte fibroso tem, geralmente, cerca de 0,317 cm a 0,476 cm (1\/8 a 3\/16 de polegada) de espessura e \u00e9 composto, normalmente, por fibras de silicato.<\/p>\n

Na d\u00e9cada de 1980, a tecnologia de filtros cer\u00e2micos de espuma para fundi\u00e7\u00f5es foi r\u00e1pida e amplamente aceita pelo mercado e utilizada em uma ampla gama de produtos de alum\u00ednio de alta qualidade, incluindo materiais de embalagem r\u00edgidos, chapas para impress\u00e3o litogr\u00e1fica e produtos aeroespaciais, tais como placas, chapas, pe\u00e7as forjadas e extrus\u00f5es.<\/p>\n

Para quem est\u00e1 familiarizado com os materiais refrat\u00e1rios utilizados para conter o alum\u00ednio fundido e suas ligas, o uso de part\u00edculas de alumina em filtros de espuma cer\u00e2mica<\/a> parece ser uma escolha \u00f3bvia. A alumina \u00e9 relativamente inerte quimicamente no alum\u00ednio fundido e \u00e9 um componente comum em ligas, inclusive aquelas que cont\u00eam magn\u00e9sio. Tamb\u00e9m \u00e9 amplamente utilizada como material particulado em materiais refrat\u00e1rios empregados em fornos para fundir e manter ligas de alum\u00ednio fundidas.<\/p>\n

No entanto, a alumina possui um alto coeficiente de expans\u00e3o t\u00e9rmica linear (8,0\u00d710\u207b\u2076\/\u00b0C), e pe\u00e7as monol\u00edticas de alumina, como filtros de espuma cer\u00e2mica, apresentam baixa resist\u00eancia ao choque t\u00e9rmico devido \u00e0 elevada tens\u00e3o t\u00e9rmica gerada pela combina\u00e7\u00e3o do gradiente t\u00e9rmico causado pelo aquecimento desigual e pelo alto coeficiente de expans\u00e3o t\u00e9rmica. Durante o pr\u00e9-aquecimento e o contato inicial com o metal fundido, o material do filtro de espuma cer\u00e2mica pode sofrer fissuras ou descascamento por choque t\u00e9rmico, fazendo com que o material do filtro seja liberado no lingote ou no tarugo, onde se torna uma inclus\u00e3o. Al\u00e9m disso, quando o filtro de alumina espumada fica confinado no copo filtrante durante o pr\u00e9-aquecimento e o uso, a alta taxa de expans\u00e3o t\u00e9rmica do filtro gera uma grande tens\u00e3o compressiva lateral, o que resulta na falha por compress\u00e3o do filtro.<\/p>","protected":false},"excerpt":{"rendered":"

The open-cell foam ceramic filter used in aluminum foundries was developed in the early 1970s, and the technology was first commercially applied in 1974 to…<\/p>","protected":false},"author":1,"featured_media":10664,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nFoam Ceramic Filter for Foundries -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"The open-cell foam ceramic filter used in aluminum foundries the technology was first commercially applied to produce rolled ingots.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/pt\/foam-ceramic-filter-for-foundries\/\" \/>\n<meta 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