{"id":8627,"date":"2021-04-29T07:46:17","date_gmt":"2021-04-29T07:46:17","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8627"},"modified":"2021-04-29T07:46:17","modified_gmt":"2021-04-29T07:46:17","slug":"degassing-process-in-aluminium","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/degassing-process-in-aluminium\/","title":{"rendered":"Processo de desgaseifica\u00e7\u00e3o do alum\u00ednio"},"content":{"rendered":"

Sabe-se que metais fundidos, como o alum\u00ednio, cont\u00eam altos n\u00edveis de fragmentos de \u00f3xido e\/ou nitreto, os quais t\u00eam um efeito negativo na solidifica\u00e7\u00e3o de certas ligas. A forma fundida ou liquefeita do alum\u00ednio tamb\u00e9m favorece a forma\u00e7\u00e3o e a absor\u00e7\u00e3o de hidrog\u00eanio no alum\u00ednio fundido. O hidrog\u00eanio se precipita na forma de poros durante a solidifica\u00e7\u00e3o da liga de alum\u00ednio e \u00e9 prejudicial \u00e0s propriedades mec\u00e2nicas da liga s\u00f3lida. A desgaseifica\u00e7\u00e3o \u00e9 um m\u00e9todo eficaz para reduzir a porosidade causada pelo hidrog\u00eanio. O processo de desgaseifica\u00e7\u00e3o do alum\u00ednio \u00e9 essencial para remover o hidrog\u00eanio dissolvido e o conte\u00fado n\u00e3o met\u00e1lico do metal fundido antes da fundi\u00e7\u00e3o, a fim de obter a melhor qualidade.<\/p>\n

Uma mistura de g\u00e1s inerte (como arg\u00f4nio ou nitrog\u00eanio) e um g\u00e1s reativo (como cloro, fluoreto de hidrog\u00eanio ou enxofre) \u00e9 introduzida no alum\u00ednio fundido para capturar o hidrog\u00eanio e umedecer as impurezas s\u00f3lidas. A mistura de gases sobe borbulhando at\u00e9 a superf\u00edcie, juntamente com o hidrog\u00eanio e as impurezas de \u00f3xido.<\/p>\n

O alum\u00ednio fundido tamb\u00e9m pode exigir um tratamento de desgaseifica\u00e7\u00e3o por fluxo para introduzir agentes de refino no metal fundido. A desgaseifica\u00e7\u00e3o por fluxo \u00e9 um processo no qual misturas de sais em p\u00f3 ou granuladas, como cloretos ou fluoretos, s\u00e3o introduzidas no alum\u00ednio fundido por meio de um g\u00e1s transportador, como nitrog\u00eanio ou arg\u00f4nio. O fluxo salino pode ser introduzido por equipamento rotativo de desgaseifica\u00e7\u00e3o<\/a>.<\/p>\n

\"Processo<\/p>\n

O dispositivo rotativo de desgaseifica\u00e7\u00e3o inclui um eixo oco central acoplado ao rotor, que \u00e9 inserido na banha de alum\u00ednio fundido e girado de modo que o fluxo de sal percorra o eixo oco e seja disperso no alum\u00ednio fundido por meio de orif\u00edcios no rotor. A liga de alum\u00ednio l\u00edquida entra continuamente no dispositivo de desgaseifica\u00e7\u00e3o, e o nitrog\u00eanio \u00e9 injetado continuamente. Por meio do processo de desgaseifica\u00e7\u00e3o do alum\u00ednio, alcan\u00e7a-se o objetivo de purificar a liga de alum\u00ednio l\u00edquida.<\/p>\n

O dispositivo rotativo de desgaseifica\u00e7\u00e3o utiliza o nitrog\u00eanio injetado na massa fundida de liga de alum\u00ednio, que \u00e9 triturado pelo rotor girat\u00f3rio de nitreto de sil\u00edcio, formando um grande n\u00famero de bolhas de difus\u00e3o, de modo que a liga de alum\u00ednio l\u00edquida e o nitrog\u00eanio entrem em contato total no tanque de processamento.<\/p>\n

De acordo com o princ\u00edpio da diferen\u00e7a de press\u00e3o e da adsor\u00e7\u00e3o superficial, as bolhas absorvem o hidrog\u00eanio presente na massa fundida e adsorvem a esc\u00f3ria oxidada (quanto maior a colis\u00e3o, menor a intercepta\u00e7\u00e3o radial). A esc\u00f3ria se forma na superf\u00edcie do metal fundido. O metal fundido de liga de alum\u00ednio flui da sa\u00edda do dispositivo de desgaseifica\u00e7\u00e3o (localizado na parte inferior do recipiente) para a m\u00e1quina de fundi\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"

It is known that molten metals such as aluminum include high levels of oxide and\/or nitride fragments, which have a negative effect on the solidification…<\/p>","protected":false},"author":1,"featured_media":8509,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8627","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nDegassing Process In Aluminum,Rotary Degassing Device<\/title>\n<meta name=\"description\" content=\"The degassing process in aluminum is essential to remove dissolved hydrogen and non-metallic content from molten metal before casting.\" \/>\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\/degassing-process-in-aluminium\/\" \/>\n<meta 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