{"id":2728,"date":"2020-07-10T03:07:53","date_gmt":"2020-07-10T03:07:53","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2728"},"modified":"2020-10-14T07:19:41","modified_gmt":"2020-10-14T07:19:41","slug":"flux-for-aluminum-melt","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/flux-for-aluminum-melt\/","title":{"rendered":"Fundente para alum\u00ednio fundido"},"content":{"rendered":"<p>O fundente para o alum\u00ednio fundido \u00e9 uma subst\u00e2ncia s\u00f3lida utilizada em fundi\u00e7\u00f5es de alum\u00ednio (geralmente uma mistura de sais de cloreto e fluoreto), cujo objetivo \u00e9 reduzir a oxida\u00e7\u00e3o do metal fundido, minimizar a penetra\u00e7\u00e3o de hidrog\u00eanio da atmosfera e absorver as inclus\u00f5es n\u00e3o met\u00e1licas em suspens\u00e3o no metal fundido, manter o forno\/panela livre de ac\u00famulo de \u00f3xido nas paredes, reduzir a quantidade de alum\u00ednio que permanece na esc\u00f3ria, remover o hidrog\u00eanio dissolvido do metal fundido, extrair gr\u00e3os de alum\u00ednio durante a solidifica\u00e7\u00e3o e modificar as liga\u00e7\u00f5es que cont\u00eam sil\u00edcio; as inclus\u00f5es de sil\u00edcio oxidam o excesso de magn\u00e9sio.<\/p>\n<h2>Fundente para alum\u00ednio fundido<\/h2>\n<p>A pr\u00e1tica comum para a introdu\u00e7\u00e3o do fluxo \u00e9 a aplica\u00e7\u00e3o manual.<br \/>\nA maior parte do fundente \u00e9 aplicada na superf\u00edcie do metal fundido e incorporada ao mesmo por meio de agita\u00e7\u00e3o. Parte do fundente (para desgaseifica\u00e7\u00e3o e refinamento de gr\u00e3os) \u00e9 imersa no fundo por meio de uma camp\u00e2nula porosa limpa e pr\u00e9-aquecida.<\/p>\n<p>O <a href=\"http:\/\/www.alalloycasting.com\/pt\/fluxes-for-aluminum-alloys\/\">fluxos<\/a> tamb\u00e9m pode ser introduzido na massa fundida por meio da inje\u00e7\u00e3o, na forma de p\u00f3, em um fluxo de g\u00e1s inerte (arg\u00f4nio ou nitrog\u00eanio).<br \/>\nA t\u00e9cnica mais simples de inje\u00e7\u00e3o de fluxo consiste em mergulhar a pistola de pulveriza\u00e7\u00e3o na massa fundida.<br \/>\nO m\u00e9todo mais eficaz de introdu\u00e7\u00e3o do fluxo \u00e9 a inje\u00e7\u00e3o por meio de um desgaseificador rotativo.<\/p>\n<h2>Classifica\u00e7\u00e3o do fluxo de alum\u00ednio<\/h2>\n<p>Agente de cobertura<br \/>\nFluxo de esc\u00f3ria<br \/>\nLimpeza do fluxo<br \/>\nAgente desgaseificador<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5541\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/07\/Flux-for-Aluminum-Melt-1.jpg\" alt=\"Fundente para alum\u00ednio fundido\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Flux-for-Aluminum-Melt-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Flux-for-Aluminum-Melt-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h3>Agente de cobertura<\/h3>\n<p>O ponto de fus\u00e3o do <a href=\"http:\/\/www.alalloycasting.com\/pt\/tundish-flux\/\">fluxo de cobertura<\/a> \u00e9 inferior ao do alum\u00ednio. O fluxo de cobertura \u00e9 aplicado \u00e0 superf\u00edcie do alum\u00ednio fundido, formando uma camada cont\u00ednua sobre a superf\u00edcie do alum\u00ednio fundido, protegendo 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 e tamb\u00e9m pode conter alguns aditivos de CaCl\u2082, CaF\u2082 ou KF. O fluoreto (CaF\u2082, KF) 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 opera\u00e7\u00e3o. O fluxo protetor sem s\u00f3dio \u00e9 utilizado para fundir ligas hipereut\u00e9ticas de alum\u00ednio-sil\u00edcio (ligas com teor de sil\u00edcio superior a 12,6%). A liga hipereut\u00e9tica \u00e9 modificada com f\u00f3sforo, e a adi\u00e7\u00e3o de f\u00f3sforo leva ao refinamento do cristal prim\u00e1rio de sil\u00edcio. O s\u00f3dio reduz o efeito de purifica\u00e7\u00e3o do f\u00f3sforo nessas ligas.<\/p>\n<h3>Fluxo de esc\u00f3ria<\/h3>\n<p>O <a href=\"http:\/\/www.alalloycasting.com\/pt\/deslagging-flux\/\">fluxo de esc\u00f3ria<\/a> promove a separa\u00e7\u00e3o do alum\u00ednio fundido remanescente na esc\u00f3ria (\u00e0s vezes at\u00e9 80%). Al\u00e9m de cloretos e fluoretos, os fundentes tamb\u00e9m cont\u00eam componentes oxidantes (KNO\u2083), que reagem exotermicamente com o alum\u00ednio quando aquecidos. O calor gerado pelo fundente melhora a molhabilidade e a fluidez do alum\u00ednio retido, e as got\u00edculas de alum\u00ednio se aglutinam e fluem para a massa fundida. A esc\u00f3ria tratada pelo removedor de esc\u00f3ria \u00e9 pulverulenta e seca. Ela pode ser facilmente removida do forno. O fundente 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 (aparas, res\u00edduos de usinagem, etc.).<\/p>\n<h3>Fluxo de limpeza<\/h3>\n<p>O <a href=\"http:\/\/www.alalloycasting.com\/pt\/oxide-removal-flux\/\">fluxo de limpeza<\/a> remove os \u00f3xidos em suspens\u00e3o na massa fundida. Assim como o fluxo, os agentes de limpeza consistem em uma mistura de cloreto, fluoreto e oxidante. O fluxo de limpeza gera menos calor, portanto, seu efeito de separa\u00e7\u00e3o do alum\u00ednio \u00e9 menor. No entanto, eles apresentam maior capacidade de absorver inclus\u00f5es de \u00f3xido na massa fundida.<\/p>\n<h3>\u00a0Agente desgaseificador<\/h3>\n<p>Fluxos compostos por sais que cont\u00eam cloro e fl\u00faor s\u00e3o utilizados para desgaseificar ligas de alum\u00ednio fundidas. O fluxo desgaseificado \u00e9 geralmente produzido na forma de tabletes. Quando os tabletes de fluxo s\u00e3o imersos no fundo do forno, dentro de uma camp\u00e2nula perfurada limpa e pr\u00e9-aquecida, a opera\u00e7\u00e3o de desgaseifica\u00e7\u00e3o tem in\u00edcio. Os componentes do fluxo 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 na bolha formada \u00e9 muito baixa, de modo que ele se difunde do alum\u00ednio fundido para dentro da bolha. As bolhas escapam da massa fundida e, em seguida, o g\u00e1s \u00e9 removido pelo sistema de exaust\u00e3o. Esse processo continua at\u00e9 que a forma\u00e7\u00e3o de bolhas cesse. Os agentes de desgaseifica\u00e7\u00e3o tamb\u00e9m podem ser introduzidos por m\u00e9todos de 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 (efeito de limpeza).<\/p>","protected":false},"excerpt":{"rendered":"<p>The flux for aluminum melt is a solid substance used in aluminum foundries (usually a mixture of chloride and fluoride salts), the purpose is to&hellip;<\/p>","protected":false},"author":1,"featured_media":5542,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[4719,4343,832,4720,833,4528],"class_list":["post-2728","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-covering-agent","tag-degassing-agent","tag-flux-for-aluminum-melt","tag-furnace-cleaning-flux","tag-refining-agent","tag-slagging-flux"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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