{"id":6574,"date":"2020-11-19T08:54:02","date_gmt":"2020-11-19T08:54:02","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6574"},"modified":"2020-11-19T08:54:02","modified_gmt":"2020-11-19T08:54:02","slug":"aluminum-alloy-melting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-alloy-melting\/","title":{"rendered":"Fus\u00e3o de ligas de alum\u00ednio"},"content":{"rendered":"<p><strong>A rela\u00e7\u00e3o entre o alum\u00ednio e o hidrog\u00eanio no processo de fus\u00e3o de ligas de alum\u00ednio<\/strong><\/p>\n<p>A liga de alum\u00ednio tem a tend\u00eancia de absorver g\u00e1s quando se encontra no estado l\u00edquido. O g\u00e1s absorvido prov\u00e9m principalmente de duas fontes. Por um lado, trata-se do g\u00e1s contido no pr\u00f3prio material de alum\u00ednio. Por outro lado, \u00e9 adquirido e utilizado em diferentes m\u00e9todos de fus\u00e3o. O g\u00e1s absorvido no forno, a umidade e a gordura que aderem \u00e0 carga do forno provenientes do ar \u00famido do ambiente circundante, o desareador n\u00e3o seco e a umidade absorvida durante a fundi\u00e7\u00e3o. Pesquisas experimentais mostram que o hidrog\u00eanio \u00e9 o g\u00e1s mais presente na absor\u00e7\u00e3o da liga de alum\u00ednio; portanto, o hidrog\u00eanio \u00e9 o principal alvo da desgaseifica\u00e7\u00e3o.<\/p>\n<p>A quantidade de hidrog\u00eanio dissolvida na liga de alum\u00ednio aumenta com a temperatura de aquecimento do alum\u00ednio fundido. Ela come\u00e7a a absorver hidrog\u00eanio a partir de cerca de 600 \u00b0C e aumenta gradualmente at\u00e9 750 \u00b0C. A temperatura deve ultrapassar 750 \u00b0C para evitar a absor\u00e7\u00e3o de grandes quantidades de hidrog\u00eanio. O hidrog\u00eanio se dissolve no muco e forma uma \u201cfase l\u00edquida\u201d com o alum\u00ednio. Durante a solidifica\u00e7\u00e3o, o hidrog\u00eanio escapa sem se dissolver no alum\u00ednio. No entanto, como a superf\u00edcie da pe\u00e7a fundida se solidifica primeiro, o hidrog\u00eanio n\u00e3o consegue escapar, permanecendo na pe\u00e7a e formando poros.<\/p>\n<p><strong>Agente desgaseificador<\/strong><\/p>\n<p>O objetivo do <a href=\"http:\/\/www.alalloycasting.com\/pt\/aluminium-refining-agent\/\">agente desgaseificador<\/a> \u00e9 remover o hidrog\u00eanio absorvido na solu\u00e7\u00e3o da liga de alum\u00ednio, impedir a forma\u00e7\u00e3o de poros no interior da pe\u00e7a fundida e tornar a estrutura cristalina mais fina. O agente de desgaseifica\u00e7\u00e3o pode ser dividido em dois tipos: agente de desgaseifica\u00e7\u00e3o s\u00f3lido e agente de desgaseifica\u00e7\u00e3o gasoso. Os agentes desgaseificantes s\u00f3lidos incluem ZnCl\u2082, MnCl\u2082, AlCl\u2083, etc., e os agentes desgaseificantes gasosos incluem cloro e nitrog\u00eanio.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6481\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/11\/Molten-Aluminium-Casting-Flux.jpg\" alt=\"Fluxo para fundi\u00e7\u00e3o de alum\u00ednio fundido\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Molten-Aluminium-Casting-Flux.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Molten-Aluminium-Casting-Flux-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Oxida\u00e7\u00e3o da liga de alum\u00ednio<\/strong><\/p>\n<p>O \u00f3xido de alum\u00ednio se forma quando o alum\u00ednio \u00e9 oxidado. Ele absorve intensamente o hidrog\u00eanio presente no alum\u00ednio l\u00edquido. Ao mesmo tempo, a solu\u00e7\u00e3o de alum\u00ednio e suas ligas fica contaminada pelo \u00f3xido de alum\u00ednio, e seu desempenho \u00e9 gravemente prejudicado. A alumina n\u00e3o \u00e9 sol\u00favel no alum\u00ednio fundido, mas reduz a fluidez da liga, fazendo com que as pe\u00e7as fundidas apresentem poros, rachaduras e imperfei\u00e7\u00f5es, reduzindo assim as propriedades mec\u00e2nicas e de usinagem dessas pe\u00e7as.<\/p>\n<p>Para obter as condi\u00e7\u00f5es necess\u00e1rias para uma liga de alum\u00ednio relativamente pura, o primeiro passo \u00e9 utilizar uma carga seca e livre de impurezas. A umidade e os produtos de corros\u00e3o na superf\u00edcie do metal s\u00e3o a principal causa de contamina\u00e7\u00e3o da liga devido \u00e0 oxida\u00e7\u00e3o. Durante a fundi\u00e7\u00e3o, a oxida\u00e7\u00e3o da liga de alum\u00ednio ocorre devido \u00e0 intera\u00e7\u00e3o com a atmosfera no forno. Quanto mais alta for a temperatura da liga l\u00edquida, mais intenso ser\u00e1 o grau de oxida\u00e7\u00e3o. Portanto, boas condi\u00e7\u00f5es de fus\u00e3o s\u00e3o fundamentais para prevenir a oxida\u00e7\u00e3o da liga de alum\u00ednio, desde que a liga l\u00edquida n\u00e3o seja superaquecida.<\/p>","protected":false},"excerpt":{"rendered":"<p>The relationship between aluminum and hydrogen in Aluminum Alloy Melting Process Aluminum alloy has a tendency to absorb gas when it is in a liquid&hellip;<\/p>","protected":false},"author":1,"featured_media":6580,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aluminum Alloy Melting | Refining and Degassing Process<\/title>\n<meta name=\"description\" content=\"The degassing agent can 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