filtros de espuma cer\u00e2mica para alum\u00ednio fundido<\/a>, foram utilizados filtros com enchimento de alumina lamelar. Os filtros com enchimento s\u00e3o grandes recipientes aquecidos que cont\u00eam gr\u00e3os soltos de alumina lamelar, utilizados para fundi\u00e7\u00f5es repetidas durante v\u00e1rios dias ou at\u00e9 semanas. O longo tempo de exposi\u00e7\u00e3o do metal fundido a materiais agregados n\u00e3o ligados, como nos filtros de espuma cer\u00e2mica com enchimentos e refrat\u00e1rios, exige o uso de um material granular quimicamente inerte, como o \u00f3xido de alum\u00ednio.<\/p>\n![\"Filtro](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/07\/Advanced-Ceramic-Filter.jpg\")
<\/p>\n
No entanto, a alumina possui um coeficiente de expans\u00e3o t\u00e9rmica linear relativamente alto (8,0 \u00d7 10\u207b\u2076 \/ \u00b0C), e as formas monol\u00edticas de alumina, como os filtros de espuma cer\u00e2mica, apresentam baixa resist\u00eancia ao calor devido \u00e0s elevadas tens\u00f5es t\u00e9rmicas criadas pela combina\u00e7\u00e3o de gradientes t\u00e9rmicos resultantes do aquecimento desigual e de um alto coeficiente de expans\u00e3o t\u00e9rmica.<\/p>\n
Durante o pr\u00e9-aquecimento e o contato inicial com o metal fundido, o material filtrante de espuma cer\u00e2mica reticulada pode rachar ou fraturar-se; em consequ\u00eancia disso, o material filtrante penetra no lingote ou no tarugo, onde se torna uma inclus\u00e3o.
\nAl\u00e9m disso, quando o filtro cer\u00e2mico de espuma \u00e0 base de alumina \u00e9 mantido no recipiente do filtro durante o pr\u00e9-aquecimento e o uso, podem ser geradas altas tens\u00f5es de compress\u00e3o transversais em decorr\u00eancia do alto coeficiente de expans\u00e3o t\u00e9rmica do filtro, resultando na destrui\u00e7\u00e3o do filtro durante a compress\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"
Advanced ceramic filter is used in aluminum oxide granular material should seem an obvious choice to any person skilled in the art of refractory materials…<\/p>","protected":false},"author":1,"featured_media":5777,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,138],"tags":[1720,1721],"class_list":["post-3053","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ceramic-foam-filter","category-seo","tag-advanced-ceramic-filter","tag-ceramic-foam-filters-for-molten-aluminum"],"yoast_head":"\n
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