{"id":8238,"date":"2021-03-31T03:43:46","date_gmt":"2021-03-31T03:43:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8238"},"modified":"2021-03-31T03:43:46","modified_gmt":"2021-03-31T03:43:46","slug":"aluminum-fluxes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-fluxes\/","title":{"rendered":"Fluxos de alum\u00ednio"},"content":{"rendered":"

Os fundentes para fundi\u00e7\u00e3o de alum\u00ednio s\u00e3o subst\u00e2ncias s\u00f3lidas (geralmente uma mistura de cloreto e fluoreto) utilizadas em fundi\u00e7\u00f5es e usinas de alum\u00ednio. O objetivo \u00e9 reduzir a oxida\u00e7\u00e3o do metal fundido, diminuir a penetra\u00e7\u00e3o de hidrog\u00eanio da atmosfera, absorver as inclus\u00f5es n\u00e3o met\u00e1licas suspensas no metal fundido, manter o forno\/panela livre de \u00f3xidos acumulados nas paredes e reduzir o teor de alum\u00ednio remanescente na esc\u00f3ria. Para remover o hidrog\u00eanio dissolvido no metal fundido, refinar os gr\u00e3os de alum\u00ednio durante o processo de solidifica\u00e7\u00e3o, modificar as inclus\u00f5es de sil\u00edcio na liga que cont\u00e9m sil\u00edcio e oxidar o excesso de magn\u00e9sio. Diferentes fundentes para fundi\u00e7\u00e3o de alum\u00ednio t\u00eam fun\u00e7\u00f5es diferentes.<\/p>\n

Fluxos para fundi\u00e7\u00e3o de alum\u00ednio
\nUm fluxo de refino composto por sais que cont\u00eam cloro e fl\u00faor \u00e9 utilizado para desgaseificar ligas de alum\u00ednio fundidas. Os componentes do agente de refino reagem com o alum\u00ednio para formar compostos gasosos (cloreto de alum\u00ednio, fluoreto de alum\u00ednio). O g\u00e1s forma bolhas e sobe na massa fundida. A press\u00e3o parcial do hidrog\u00eanio nas bolhas formadas \u00e9 muito baixa, de modo que ele se difunde do alum\u00ednio fundido para dentro das bolhas. As bolhas escapam da massa fundida e, em seguida, passam pelo sistema de exaust\u00e3o para remover o g\u00e1s. Esse processo continua at\u00e9 que a forma\u00e7\u00e3o de bolhas cesse. O fluxo desgaseificado tamb\u00e9m pode ser introduzido por inje\u00e7\u00e3o. Nesse caso, o g\u00e1s inerte atua como um transportador para o fluxo granular. Al\u00e9m do efeito de desgaseifica\u00e7\u00e3o, o tratamento de desgaseifica\u00e7\u00e3o tamb\u00e9m pode remover inclus\u00f5es n\u00e3o met\u00e1licas suspensas no material fundido.<\/p>\n

O fluxo de desescoria\u00e7\u00e3o<\/a> favorece a separa\u00e7\u00e3o do alum\u00ednio fundido retido na esc\u00f3ria. Al\u00e9m dos cloretos e dos fluoretos, fluxos<\/a> tamb\u00e9m cont\u00eam componentes oxidantes, que reagem exotermicamente com o alum\u00ednio quando aquecidos. O calor gerado pelo fluxo melhora a molhabilidade e a fluidez do alum\u00ednio retido, e as got\u00edculas de alum\u00ednio se unem e fluem para a massa fundida. A esc\u00f3ria tratada pelo removedor de esc\u00f3ria apresenta-se em forma de p\u00f3 e est\u00e1 seca. \u00c9 f\u00e1cil remov\u00ea-la do forno. O fluxo ajuda a reduzir a perda de alum\u00ednio, o que o torna economicamente muito vantajoso, especialmente na refundi\u00e7\u00e3o de aparas de alum\u00ednio.<\/p>\n

\"Fluxos<\/p>\n

Fluxo de esc\u00f3ria para alum\u00ednio<\/p>\n

O ponto de fus\u00e3o do fluxo de cobertura \u00e9 inferior ao do alum\u00ednio. O fluxo de cobertura \u00e9 aplicado sobre a superf\u00edcie do alum\u00ednio fundido para derreter e formar uma camada cont\u00ednua sobre a superf\u00edcie do alum\u00ednio fundido, a fim de proteger o metal l\u00edquido contra a oxida\u00e7\u00e3o e a absor\u00e7\u00e3o de hidrog\u00eanio atmosf\u00e9rico. O fluxo de cobertura \u00e9 composto por uma mistura de NaCl e KCl, podendo tamb\u00e9m conter alguns aditivos de CaCl\u2082, CaF\u2082 ou KF. O fluoreto reduz ainda mais o ponto de fus\u00e3o do fluxo e melhora sua capacidade de limpeza. A desvantagem do fluxo contendo fl\u00faor \u00e9 que ele libera vapores nocivos \u00e0 temperatura de trabalho. O fluxo de camada protetora sem s\u00f3dio \u00e9 utilizado para fundir ligas hipereut\u00e9ticas de alum\u00ednio-sil\u00edcio. A liga hipereut\u00e9tica \u00e9 modificada pelo f\u00f3sforo, e a adi\u00e7\u00e3o de f\u00f3sforo leva ao refinamento dos cristais prim\u00e1rios de sil\u00edcio. O s\u00f3dio reduz o efeito de purifica\u00e7\u00e3o do f\u00f3sforo nessas ligas.<\/p>\n

O fluxo de limpeza remove os \u00f3xidos suspensos na massa fundida. Assim como o fluxo, o limpador consiste em uma mistura de cloreto, fluoreto e oxidante. O limpador gera menos calor, portanto, seu efeito de separa\u00e7\u00e3o do alum\u00ednio \u00e9 menor. No entanto, ele possui maior capacidade de absorver inclus\u00f5es de \u00f3xido na massa fundida.<\/p>","protected":false},"excerpt":{"rendered":"

The aluminum casting fluxes are solid substances (usually a mixture of chloride and fluoride) used in aluminum smelter and foundries. The purpose is to reduce…<\/p>","protected":false},"author":1,"featured_media":8240,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8238","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminum Fluxes in aluminum smelter and foundries<\/title>\n<meta name=\"description\" content=\"Aluminum fluxes composed of salts containing chlorine and fluorine are used to degas molten aluminum alloys in smelter and foundries.\" \/>\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\/aluminum-fluxes\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aluminum Fluxes in aluminum 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