{"id":11784,"date":"2021-12-13T06:13:02","date_gmt":"2021-12-13T06:13:02","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=11784"},"modified":"2021-12-13T06:13:02","modified_gmt":"2021-12-13T06:13:02","slug":"alumina-filter-for-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/alumina-filter-for-molten-aluminum\/","title":{"rendered":"Filtro de alumina para alum\u00ednio fundido"},"content":{"rendered":"

O uso de part\u00edculas de alumina em filtros de espuma cer\u00e2mica parece ser uma escolha \u00f3bvia para a filtragem de alum\u00ednio fundido e suas ligas. A alumina \u00e9 relativamente inerte quimicamente no alum\u00ednio fundido. Ela tamb\u00e9m \u00e9 amplamente utilizada como material particulado em materiais refrat\u00e1rios empregados em fornos para fundir e manter ligas de alum\u00ednio fundidas. Al\u00e9m disso, antes do desenvolvimento dos filtros de espuma cer\u00e2mica descart\u00e1veis, utilizava-se um filtro de leito de alumina em forma de placas para a filtragem do alum\u00ednio fundido. Um filtro de leito \u00e9 um grande recipiente aquecido que cont\u00e9m part\u00edculas de alumina em forma de placas n\u00e3o aglutinadas e \u00e9 utilizado para fundi\u00e7\u00f5es repetidas ao longo de v\u00e1rios dias ou at\u00e9 semanas. A exposi\u00e7\u00e3o prolongada do metal fundido a materiais agregados n\u00e3o aglutinados (como filtros de leito e materiais refrat\u00e1rios) requer o uso de materiais particulados quimicamente inertes, como a alumina.<\/p>\n

No entanto, a alumina apresenta um coeficiente de expans\u00e3o t\u00e9rmica linear relativamente alto (8,0\u00d710\u207b\u2076\/\u00b0C), e a forma geral da alumina, como, por exemplo, filtro de espuma cer\u00e2mica<\/a>, apresenta 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 e se transforme em inclus\u00f5es no mesmo. Al\u00e9m disso, quando o filtro de espuma de alumina est\u00e1 em uma cuba de filtragem restrita durante o pr\u00e9-aquecimento e o uso, a alta taxa de expans\u00e3o t\u00e9rmica do filtro pode resultar em alta tens\u00e3o de compress\u00e3o lateral, causando danos por compress\u00e3o ao filtro.<\/p>\n

\"\"<\/p>\n

O ortofosfato de alum\u00ednio (Al(H\u2082PO\u2084)\u2083) \u00e9 amplamente utilizado como aglutinante refrat\u00e1rio na ind\u00fastria metal\u00fargica. Apresenta boa resist\u00eancia em estado cru durante o processo de secagem a uma temperatura relativamente baixa, baixo encolhimento do corpo cru e boa resist\u00eancia no processo de queima subsequente. O ortofosfato de alum\u00ednio \u00e9 relativamente barato, amplamente dispon\u00edvel e requer uma temperatura de queima relativamente baixa (1.100 \u00b0C) para se obter a liga\u00e7\u00e3o final de fosfato de alum\u00ednio (AlPO\u2084). Por essas raz\u00f5es, e devido ao custo relativamente baixo do ortofosfato de alum\u00ednio, esse material \u00e9 amplamente utilizado na fabrica\u00e7\u00e3o de filtros de espuma cer\u00e2mica para a filtragem de alum\u00ednio fundido.<\/p>\n

No entanto, a liga\u00e7\u00e3o de fosfato de alum\u00ednio formada reagir\u00e1 com o magn\u00e9sio presente em muitas ligas de alum\u00ednio comerciais e n\u00e3o \u00e9 adequada para ligas de alum\u00ednio-magn\u00e9sio. O magn\u00e9sio presente no alum\u00ednio fundido \u00e9 altamente reativo, possui uma press\u00e3o de vapor relativamente alta e penetra facilmente em qualquer matriz refrat\u00e1ria. Ele reage facilmente com quase todos os materiais de \u00f3xido comuns.<\/p>","protected":false},"excerpt":{"rendered":"

The use of alumina particles in ceramic foam filter seems to be an obvious choice for molten aluminum and its alloys filtration. Alumina is relatively…<\/p>","protected":false},"author":1,"featured_media":11785,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[13043,21],"class_list":["post-11784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-alumina-filter-for-molten-aluminum","tag-ceramic-foam-filter"],"yoast_head":"\nAlumina Filter for Molten Aluminum, Ceramic Foam Filter<\/title>\n<meta name=\"description\" content=\"The use of alumina particles in ceramic foam filter seems to be an obvious choice for molten aluminum and its alloys filtration.\" \/>\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\/alumina-filter-for-molten-aluminum\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" 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