{"id":6566,"date":"2020-11-19T09:26:02","date_gmt":"2020-11-19T09:26:02","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6566"},"modified":"2020-11-19T09:26:02","modified_gmt":"2020-11-19T09:26:02","slug":"molten-aluminum-refining-treatments","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/molten-aluminum-refining-treatments\/","title":{"rendered":"Tratamentos de refino de alum\u00ednio fundido"},"content":{"rendered":"

A liga de alum\u00ednio fundida deve passar por tratamentos de refino antes da fundi\u00e7\u00e3o para:<\/p>\n

Desgaseifica\u00e7\u00e3o: O alum\u00ednio fundido cont\u00e9m uma grande quantidade de hidrog\u00eanio. Se esse hidrog\u00eanio n\u00e3o for removido, surgir\u00e3o microperfura\u00e7\u00f5es e poros na pe\u00e7a fundida.
\nGr\u00e3os refinados: Melhoram as propriedades mec\u00e2nicas das pe\u00e7as fundidas por meio do controle do tamanho dos gr\u00e3os ap\u00f3s a solidifica\u00e7\u00e3o.
\nMetamorfismo: Alterar a forma do sil\u00edcio por meio da adi\u00e7\u00e3o de uma pequena quantidade de elementos metam\u00f3rficos, melhorando assim o desempenho da pe\u00e7a fundida.<\/p>\n

Existem v\u00e1rios m\u00e9todos para esses materiais fundidos refino de alum\u00ednio<\/a> tratamentos. O m\u00e9todo anterior consiste em adicionar, sucessivamente, diversos fundentes ao metal fundido no saco de transfer\u00eancia ou no forno de reten\u00e7\u00e3o para o tratamento. Nos \u00faltimos anos, a \u201cesta\u00e7\u00e3o de processamento de metal\u201d foi desenvolvida com sucesso e tem sido amplamente utilizada. Todos os tratamentos de refino do alum\u00ednio fundido podem ser conclu\u00eddos de forma mais eficiente em uma \u00fanica etapa.<\/p>\n

\u00c0 medida que a temperatura de fus\u00e3o aumenta, a solubilidade do hidrog\u00eanio no alum\u00ednio fundido aumenta gradualmente. No entanto, a solubilidade do hidrog\u00eanio no alum\u00ednio s\u00f3lido \u00e9 muito baixa; portanto, quando a liga de alum\u00ednio se solidifica, o hidrog\u00eanio precipitado se aglomera e forma microporos e poros na pe\u00e7a fundida.<\/p>\n

Para reduzir a inala\u00e7\u00e3o de hidrog\u00eanio, os materiais refrat\u00e1rios, cadinhos e ferramentas devem ser pr\u00e9-aquecidos cuidadosamente, e os res\u00edduos oleosos recuperados devem ser desidratados. A chama do queimador deve ser levemente oxidante para evitar o excesso de hidrog\u00eanio nos produtos da combust\u00e3o. A temperatura do metal fundido deve ser mantida o mais baixa poss\u00edvel, pois altas temperaturas dissolvem mais hidrog\u00eanio. \u00c9 claro que, por mais cuidado que se tenha, o hidrog\u00eanio ainda estar\u00e1 presente.<\/p>\n

\"Tratamentos<\/p>\n

O n\u00famero de poros que pode ser tolerado em uma pe\u00e7a fundida depende do processo de fundi\u00e7\u00e3o e da finalidade da pe\u00e7a. Se o metal esfriar lentamente, como em um molde de areia, os gases de exaust\u00e3o se acumular\u00e3o em pequenas bolhas e permanecer\u00e3o na pe\u00e7a fundida. Essas bolhas s\u00e3o detectadas no processo subsequente de corte ou jateamento, e os defeitos porosos semelhantes a \u201cporos min\u00fasculos\u201d na superf\u00edcie processada sofrer\u00e3o grave perda de propriedades mec\u00e2nicas e estanqueidade ao ar.<\/p>\n

Em processos de fundi\u00e7\u00e3o com velocidades de solidifica\u00e7\u00e3o relativamente r\u00e1pidas, como a fundi\u00e7\u00e3o em molde met\u00e1lico e a fundi\u00e7\u00e3o de baixa press\u00e3o, os poros formados s\u00e3o geralmente pequenos e bastante dispersos. Portanto, eles t\u00eam pouco efeito sobre as propriedades mec\u00e2nicas e at\u00e9 mesmo exercem um certo efeito positivo na produ\u00e7\u00e3o real \u2014 podem compensar a contra\u00e7\u00e3o local das pe\u00e7as fundidas. Para a fundi\u00e7\u00e3o em molde met\u00e1lico de alta densidade e a fundi\u00e7\u00e3o a baixa press\u00e3o, ainda \u00e9 necess\u00e1rio adotar um processo eficaz de desgaseifica\u00e7\u00e3o.<\/p>\n

No passado, na produ\u00e7\u00e3o de pe\u00e7as fundidas por inje\u00e7\u00e3o sob press\u00e3o, geralmente n\u00e3o era necess\u00e1rio desgaseificar o metal fundido. Os poros presentes nele s\u00e3o, em geral, causados pela entrada de ar durante o processo de moldagem por inje\u00e7\u00e3o hidr\u00e1ulica do metal. A porosidade causada pelo hidrog\u00eanio pode n\u00e3o ser grave. Isso se deve, principalmente, ao fato de que a fundi\u00e7\u00e3o sob press\u00e3o geralmente utiliza uma temperatura de vazamento mais baixa, e o pr\u00f3prio metal fundido apresenta um teor de hidrog\u00eanio mais baixo. No entanto, nos \u00faltimos anos, com o aprimoramento da tecnologia de fundi\u00e7\u00e3o sob press\u00e3o e os requisitos mais exigentes quanto \u00e0 qualidade das pe\u00e7as fundidas, cada vez mais f\u00e1bricas de fundi\u00e7\u00e3o sob press\u00e3o realizam a desgaseifica\u00e7\u00e3o do metal fundido antes do processo de fundi\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"

The molten aluminum alloy must undergo refining treatments before casting to: Degassing: The molten aluminum contains a large amount of hydrogen. If it is not…<\/p>","protected":false},"author":1,"featured_media":6591,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6566","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nMolten Aluminum Refining Treatments by Degassing<\/title>\n<meta name=\"description\" content=\"The molten aluminum must undergo refining treatments: degassing, refined grains, metamorphism, thereby improving the casting performance.\" \/>\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\/molten-aluminum-refining-treatments\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Molten Aluminum 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