{"id":1130,"date":"2020-04-15T09:23:51","date_gmt":"2020-04-15T09:23:51","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=1130"},"modified":"2020-08-28T06:54:34","modified_gmt":"2020-08-28T06:54:34","slug":"aluminum-casting-process","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-casting-process\/","title":{"rendered":"Processo de fundi\u00e7\u00e3o de alum\u00ednio"},"content":{"rendered":"

O alum\u00ednio \u00e9 um elemento met\u00e1lico ativo, que se oxida facilmente e absorve o g\u00e1s durante o processo de fundi\u00e7\u00e3o de alum\u00ednio. O \u00f3xido de alum\u00ednio (Al\u2082O\u2083) possui um alto ponto de fus\u00e3o (2.050 \u00b0C) e sua densidade \u00e9 ligeiramente maior do que a do alum\u00ednio l\u00edquido. \u00c9 dif\u00edcil remov\u00ea-lo do alum\u00ednio l\u00edquido em suspens\u00e3o e ele tende a formar inclus\u00f5es de esc\u00f3ria na pe\u00e7a fundida. Durante o resfriamento, o g\u00e1s presente no alum\u00ednio fundido costuma ficar retido pela densa camada de Al\u2082O\u2083. H\u00e1 muitos poros min\u00fasculos na pe\u00e7a fundida, o que afeta sua compacta\u00e7\u00e3o e suas propriedades mec\u00e2nicas.<\/p>\n

Para evitar a oxida\u00e7\u00e3o, fluxos<\/a> com baixos pontos de fus\u00e3o (como NaCl, KCl, Na\u2083AlF\u2086) s\u00e3o comumente utilizados para isolar o alum\u00ednio l\u00edquido do ar. Minimize a agita\u00e7\u00e3o tanto quanto poss\u00edvel e desgaseifique o alum\u00ednio l\u00edquido na fase final da fundi\u00e7\u00e3o. O refinamento consiste em passar g\u00e1s cloro pelo alum\u00ednio l\u00edquido ou adicionar hexacloroetano e cloreto de zinco para formar bolhas, de modo que o hidrog\u00eanio dissolvido no alum\u00ednio l\u00edquido entre nas bolhas e se precipite. No processo de flutua\u00e7\u00e3o das bolhas, o g\u00e1s e as inclus\u00f5es de Al\u2082O\u2083 presentes no alum\u00ednio l\u00edquido s\u00e3o removidos da superf\u00edcie do l\u00edquido, de modo que o alum\u00ednio l\u00edquido se torne puro.<\/p>\n

\"Processo<\/p>\n

Processo de fundi\u00e7\u00e3o de alum\u00ednio<\/h2>\n

A liga de alum\u00ednio fundida possui um baixo ponto de fus\u00e3o e \u00e9 geralmente fundida em um cadinho. A fundi\u00e7\u00e3o em areia fina pode reduzir a rugosidade da superf\u00edcie da pe\u00e7a fundida. Para evitar que o alum\u00ednio l\u00edquido se oxide e espirre durante o processo de vazamento, costuma-se utilizar um sistema de vazamento aberto e abrir mais canais internos. Os canais retos costumam ter formato de cobra ou de pesco\u00e7o de ganso, de modo que a liga preencha a cavidade de forma r\u00e1pida e suave, sem respingos, v\u00f3rtices ou impactos. As pe\u00e7as fundidas de liga de alum\u00ednio podem ser produzidas por diversos m\u00e9todos de fundi\u00e7\u00e3o.<\/p>\n

A fundi\u00e7\u00e3o e a colada de ligas de alum\u00ednio s\u00e3o as principais etapas na produ\u00e7\u00e3o de pe\u00e7as fundidas. O controle rigoroso de todo o processo de fus\u00e3o e fundi\u00e7\u00e3o desempenha um papel importante na preven\u00e7\u00e3o de defeitos nas pe\u00e7as fundidas. O alum\u00ednio fundido tem uma forte tend\u00eancia a absorver hidrog\u00eanio, possui grande capacidade oxidante e dissolve facilmente o ferro. \u00c9 necess\u00e1rio tomar precau\u00e7\u00f5es simples e cuidadosas durante o processo de fus\u00e3o e fundi\u00e7\u00e3o para obter pe\u00e7as fundidas de alta qualidade.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum is an active metal element, and aluminum easily oxidizes and absorbs the gas in the aluminum casting process. The aluminum oxidation (Al2O3) has a…<\/p>","protected":false},"author":1,"featured_media":1566,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[35],"class_list":["post-1130","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-casting-process"],"yoast_head":"\nAluminum Casting Process | Foundry Aluminum Casting<\/title>\n<meta name=\"description\" content=\"Aluminum is an active metal element, and easily oxidizes and absorbs the gas in the aluminum casting process. 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