{"id":7678,"date":"2021-01-21T07:51:02","date_gmt":"2021-01-21T07:51:02","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7678"},"modified":"2021-01-21T07:51:02","modified_gmt":"2021-01-21T07:51:02","slug":"aluminum-melt-filtering","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-melt-filtering\/","title":{"rendered":"Filtragem de alum\u00ednio fundido"},"content":{"rendered":"

Antes de prosseguir com o processamento (fundi\u00e7\u00e3o em lingotes ou pe\u00e7as fundidas), o alum\u00ednio fundido \u00e9 derretido e, em seguida, quase sempre precisa ser filtrado. O m\u00e9todo de filtragem depende da t\u00e9cnica de fundi\u00e7\u00e3o utilizada ou do m\u00e9todo de processamento do alum\u00ednio fundido. Em geral, acredita-se que isso s\u00f3 seja poss\u00edvel e vantajoso quando se utiliza uma quantidade suficientemente grande de metal.<\/p>\n

Como a densidade das inclus\u00f5es \u00e9 diferente da do alum\u00ednio fundido, elas permanecem est\u00e1ticas, de modo que flutuam no alum\u00ednio fundido ou se depositam no fundo do mesmo. Portanto, \u00e9 poss\u00edvel separar as inclus\u00f5es do alum\u00ednio fundido. No entanto, a efici\u00eancia da separa\u00e7\u00e3o \u00e9 extremamente baixa. Isso ocorre porque a diferen\u00e7a de densidade entre cada inclus\u00e3o e o alum\u00ednio fundido n\u00e3o \u00e9 satisfat\u00f3ria, e a molhabilidade entre eles \u00e9 bastante elevada. Portanto, h\u00e1 o problema de que, mesmo que o m\u00e9todo demore muito tempo para ser conclu\u00eddo, um grande n\u00famero de inclus\u00f5es ainda permanece no alum\u00ednio fundido.<\/p>\n

De acordo com o m\u00e9todo do g\u00e1s reativo, um g\u00e1s inerte ou halog\u00eanico \u00e9 introduzido no Al fundido para gerar bolhas. As inclus\u00f5es se fixam \u00e0s bolhas e flutuam juntas no alum\u00ednio fundido, separando-as do alum\u00ednio fundido. Esse m\u00e9todo \u00e9 particularmente vantajoso para a remo\u00e7\u00e3o de gases como o hidrog\u00eanio. No entanto, as bolhas que sobem agitam violentamente a superf\u00edcie do alum\u00ednio fundido, mexendo-o. Isso causa outro problema: a camada de \u00f3xido de alum\u00ednio formada na superf\u00edcie do alum\u00ednio fundido tende a ser misturada novamente ao alum\u00ednio fundido, resultando em um aumento no n\u00famero de inclus\u00f5es de \u00f3xido de alum\u00ednio.<\/p>\n

\"Fundi\u00e7\u00e3o<\/p>\n

Entre as pe\u00e7as fundidas de alum\u00ednio, filtros de espuma cer\u00e2mica<\/a> s\u00e3o os mais comumente utilizados para a filtragem de alum\u00ednio fundido. Normalmente, s\u00e3o placas quadradas com comprimento lateral de 178 x 660 e espessura de 50 mm. S\u00e3o fabricadas por meio da introdu\u00e7\u00e3o de espuma polim\u00e9rica porosa em uma pasta cer\u00e2mica l\u00edquida. A espuma revestida de cer\u00e2mica \u00e9 ent\u00e3o seca e queimada para remover o aglutinante polim\u00e9rico. O resultado \u00e9 uma r\u00e9plica cer\u00e2mica da estrutura original da espuma org\u00e2nica. O filtro de espuma cer\u00e2mica pode ser utilizado em grandes ind\u00fastrias e pequenas fundi\u00e7\u00f5es, inclusive para filtrar o metal durante a fundi\u00e7\u00e3o de cada pe\u00e7a.<\/p>","protected":false},"excerpt":{"rendered":"

Before further processing (casting into ingots or castings), the aluminum melt is melted and then almost always requires filtering. The filtering method depends on the…<\/p>","protected":false},"author":1,"featured_media":7679,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminum Melt Filtering - Square Ceramic Foam Filters<\/title>\n<meta name=\"description\" content=\"Among aluminum castings, ceramic foam filters are the most commonly used for aluminum melt filtering. 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