{"id":1300,"date":"2020-04-21T07:37:31","date_gmt":"2020-04-21T07:37:31","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=1300"},"modified":"2020-08-28T06:10:18","modified_gmt":"2020-08-28T06:10:18","slug":"aluminium-degassing-process","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminium-degassing-process\/","title":{"rendered":"Processo de desgaseifica\u00e7\u00e3o do alum\u00ednio"},"content":{"rendered":"

O processo de desgaseifica\u00e7\u00e3o do alum\u00ednio permite purificar o metal por meio da remo\u00e7\u00e3o de g\u00e1s hidrog\u00eanio e impurezas metal\u00fargicas. A desgaseifica\u00e7\u00e3o rotativa funciona com base no princ\u00edpio de aumentar a \u00e1rea de superf\u00edcie do g\u00e1s injetado em contato com o metal. Quanto maior a \u00e1rea de superf\u00edcie, maior a taxa de transfer\u00eancia do metal para o g\u00e1s inerte. Quanto menor o tamanho das bolhas para um determinado volume de g\u00e1s, maior \u00e9 a \u00e1rea de superf\u00edcie. As bolhas menores perturbam menos a superf\u00edcie do metal fundido, reduzindo a absor\u00e7\u00e3o adicional de hidrog\u00eanio proveniente de atmosferas \u00famidas.<\/p>\n

\u00c0 medida que aumenta a demanda por produtos de alum\u00ednio de maior qualidade, especialmente na ind\u00fastria aeroespacial, torna-se necess\u00e1rio reduzir as inclus\u00f5es nos produtos fundidos. As inclus\u00f5es causam defeitos na estrutura da pe\u00e7a fundida e prejudicam suas propriedades mec\u00e2nicas. Al\u00e9m disso, podem causar dificuldades na usinagem.<\/p>\n

As impurezas no alum\u00ednio fundido podem ser de dois tipos principais: hidrog\u00eanio dissolvido e inclus\u00f5es s\u00f3lidas n\u00e3o met\u00e1licas. \u00c0 medida que o metal esfria e forma porosidade indesejada, o hidrog\u00eanio dissolvido se separa da solu\u00e7\u00e3o. Essa porosidade e as inclus\u00f5es s\u00f3lidas n\u00e3o met\u00e1licas reduzem a resist\u00eancia e afetam as propriedades finais das pe\u00e7as fundidas de alum\u00ednio.<\/p>\n

\"M\u00e1quinas<\/p>\n

Processo de desgaseifica\u00e7\u00e3o do alum\u00ednio<\/h2>\n

Os sistemas tradicionais de desgaseifica\u00e7\u00e3o de hidrog\u00eanio utilizam gases especiais. O cloro era o g\u00e1s originalmente utilizado, mas, devido \u00e0 sua natureza perigosa, a maioria das fundi\u00e7\u00f5es passou a utilizar outros gases. No entanto, muitas fundi\u00e7\u00f5es n\u00e3o levaram em considera\u00e7\u00e3o os materiais perigosos liberados pela decomposi\u00e7\u00e3o de qualquer g\u00e1s especial utilizado. Atualmente, a maioria dos fabricantes utiliza um g\u00e1s inerte (nitrog\u00eanio ou arg\u00f4nio) para remover o hidrog\u00eanio.<\/p>\n

O processo de desgaseifica\u00e7\u00e3o rotativa<\/a> remove essas impurezas por meio do nitrog\u00eanio. O g\u00e1s \u00e9 normalmente introduzido por um rotor de desgaseifica\u00e7\u00e3o, que reduz o tamanho das bolhas e dispersa o nitrog\u00eanio por todo o metal fundido. \u00c0 medida que as bolhas de g\u00e1s resultantes sobem atrav\u00e9s do metal fundido, elas absorvem o hidrog\u00eanio dissolvido no metal e o removem. Al\u00e9m disso, as part\u00edculas s\u00f3lidas n\u00e3o met\u00e1licas s\u00e3o levadas at\u00e9 a superf\u00edcie pelo efeito de flota\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"

The aluminium degassing process can clean metal by removing hydrogen gas, metallurgical impurities. Rotary degassing works on the principle of increasing the surface area of…<\/p>","protected":false},"author":1,"featured_media":1567,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18,138],"tags":[90,19],"class_list":["post-1300","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-degassing-unit","category-seo","tag-aluminum-degassing","tag-degassing-unit"],"yoast_head":"\nAluminium Degassing Process | How to Degas Molten Aluminum<\/title>\n<meta name=\"description\" content=\"Aluminium degassing process can clean metal by removing gas and impurities. 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