{"id":3200,"date":"2020-07-30T13:53:41","date_gmt":"2020-07-30T13:53:41","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3200"},"modified":"2020-08-18T06:05:01","modified_gmt":"2020-08-18T06:05:01","slug":"ceramic-foam-filters-for-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/ceramic-foam-filters-for-casting\/","title":{"rendered":"Filtros de espuma cer\u00e2mica para fundi\u00e7\u00e3o"},"content":{"rendered":"

Os filtros de espuma cer\u00e2mica para fundi\u00e7\u00e3o e fundentes s\u00e3o utilizados pela maioria das fundi\u00e7\u00f5es de alum\u00ednio para remover as inclus\u00f5es. O alum\u00ednio l\u00edquido reage quimicamente com oxig\u00eanio, nitrog\u00eanio, enxofre, carbono e outros elementos, produzindo impurezas n\u00e3o met\u00e1licas. Entre elas, as inclus\u00f5es de \u00f3xido (Al\u2082O\u2083) causam a contamina\u00e7\u00e3o mais grave do metal. Geralmente, a quantidade total de inclus\u00f5es de \u00f3xido no lingote varia de 0,002% a 0,02%.<\/p>\n

Filtros de espuma cer\u00e2mica<\/a> A Forja remove inclus\u00f5es n\u00e3o met\u00e1licas da liga de alum\u00ednio fundida e utiliza o tratamento com fluxo no forno. A tecnologia de filtragem com espuma cer\u00e2mica fora do forno h\u00e1 muito se tornou um importante meio de purifica\u00e7\u00e3o do alum\u00ednio fundido.<\/p>\n

\"Filtros<\/p>\n

As fontes de inclus\u00f5es na liga de alum\u00ednio s\u00e3o as seguintes:<\/p>\n

(1) O \u00f3xido formado pela intera\u00e7\u00e3o entre a superf\u00edcie da liga de alum\u00ednio e o g\u00e1s oxidante presente nos gases do forno, como o Al\u2082O\u2083. Essa pel\u00edcula de \u00f3xido protege o alum\u00ednio l\u00edquido contra a oxida\u00e7\u00e3o. No entanto, uma vez que a pel\u00edcula superficial seja rompida, ela ficar\u00e1 envolvida pelo alum\u00ednio fundido. Como o Al\u2082O\u2083 possui um alto ponto de fus\u00e3o (2.050 graus) e uma densidade (3,5~4,0) superior \u00e0 do alum\u00ednio fundido, ele n\u00e3o flutua, sendo, portanto, f\u00e1cil que se formem inclus\u00f5es de \u00f3xido na pe\u00e7a fundida.<\/p>\n

(2) O \u00f3xido presente na carga tamb\u00e9m \u00e9 uma importante fonte de inclus\u00f5es de \u00f3xido na liga. Por exemplo, lingotes de alum\u00ednio e ligas intermedi\u00e1rias cont\u00eam inclus\u00f5es como Al\u2082O\u2083, e a \u201cferrugem\u201d do alum\u00ednio, Al(OH)\u2083, presente na superf\u00edcie do lingote de alum\u00ednio pode contaminar diretamente o alum\u00ednio fundido durante o processo de fus\u00e3o.<\/p>\n

Em compara\u00e7\u00e3o com o alum\u00ednio, elementos de liga como sil\u00edcio, zinco, cobre etc., que apresentam menor afinidade pelo oxig\u00eanio, n\u00e3o s\u00e3o facilmente oxidados sob a prote\u00e7\u00e3o da pel\u00edcula de \u00f3xido. Mesmo que uma pequena quantidade desses elementos seja oxidada, o \u00f3xido formado \u00e9 denso e n\u00e3o prejudica a continuidade da pel\u00edcula de \u00f3xido de alum\u00ednio. Portanto, na fundi\u00e7\u00e3o de ligas de Al-Si, Al-Cu e Al-Zn, n\u00e3o \u00e9 necess\u00e1rio adicionar agentes de cobertura<\/a>.<\/p>\n

O elemento que apresenta afinidade pelo oxig\u00eanio nas ligas de alum\u00ednio \u00e9 o magn\u00e9sio. O magn\u00e9sio \u00e9 mais leve que o alum\u00ednio e se oxida mais facilmente do que ele. O MgO formado ap\u00f3s a oxida\u00e7\u00e3o n\u00e3o \u00e9 denso e destr\u00f3i a densa camada de \u00f3xido de alum\u00ednio. Como o magn\u00e9sio destr\u00f3i o efeito protetor da camada de \u00f3xido de alum\u00ednio, a fus\u00e3o da liga de alum\u00ednio-magn\u00e9sio deve ser realizada de acordo com as normas relativas ao fundente.<\/p>","protected":false},"excerpt":{"rendered":"

Ceramic Foam Filters for Casting and fluxes are used to remove the inclusions by most aluminum foundries. Liquid aluminum reacts chemically with oxygen, nitrogen, sulfur,…<\/p>","protected":false},"author":1,"featured_media":3210,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,138],"tags":[1695,1680,1697,1685,1683,1687,1690,222,1698,1699,1694,1691,1684,1682,1686,1696,1688,1692,1693,223,1681,1689,752],"class_list":["post-3200","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ceramic-foam-filter","category-seo","tag-alumina-ceramic-foam-filter-aluminum-casting-industry","tag-alumina-ceramic-foam-filter-for-alumina-alloys","tag-alumina-ceramic-foam-filter-for-casting-metal-purification","tag-alumina-ceramic-foam-filter-for-molten-aluminum-filtration","tag-alumina-ceramic-foam-filter-manufacturers","tag-alumina-ceramic-foam-filter-porous-ceramic-filter","tag-alumina-filter-ceramic-foam-for-precision-casting-filter","tag-aluminium-ceramic-foam-filter-purchasing","tag-aluminum-casting-using-alumina-ceramic-foam-filter","tag-ceralu-ai203-ceramic-foam-filters-for-aluminum","tag-ceramic-foam-filter-cff-a-for-aluminum-casting","tag-ceramic-foam-filter-with-fiber-blanket-sides","tag-china-ceramic-foam-filter-cff","tag-foam-filters-with-gasket","tag-industrial-filters-for-filtration-of-molten-aluminium","tag-molten-metal-cleanliness-when-casting-aluminium","tag-porous-silicon-carbide-ceramic-foam-filter","tag-produce-alumina-ceramic-foam-filters","tag-produce-aluminium-casting-ceramic-foam-filters","tag-sell-ceramic-foam-filters","tag-specifics-of-aluminium-alloys-filtration","tag-square-porous-alumina-ceramic-foam-filter","tag-zirconia-ceramic-foam-filter"],"yoast_head":"\nCeramic 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