{"id":7591,"date":"2021-01-19T06:18:13","date_gmt":"2021-01-19T06:18:13","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7591"},"modified":"2021-01-19T06:18:13","modified_gmt":"2021-01-19T06:18:13","slug":"degassing-aluminium","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/degassing-aluminium\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o do alum\u00ednio"},"content":{"rendered":"

A desgaseifica\u00e7\u00e3o \u00e9 uma etapa tecnol\u00f3gica intermedi\u00e1ria na produ\u00e7\u00e3o de alum\u00ednio, entre a fus\u00e3o e a fundi\u00e7\u00e3o do metal. O hidrog\u00eanio, principalmente, fica dissolvido no alum\u00ednio l\u00edquido devido \u00e0 rea\u00e7\u00e3o com o vapor de \u00e1gua. Para evitar a forma\u00e7\u00e3o de poros durante a fundi\u00e7\u00e3o, o hidrog\u00eanio \u00e9 removido \u2014 o metal l\u00edquido \u00e9 desgaseificado. Normalmente, a desgaseifica\u00e7\u00e3o \u00e9 realizada por meio da inje\u00e7\u00e3o de um g\u00e1s inerte no metal, geralmente arg\u00f4nio, que se liga \u00e0s bolhas de hidrog\u00eanio. Para que o processo industrial seja mais eficiente, o tamanho das bolhas de arg\u00f4nio deve ser o menor poss\u00edvel. Atualmente, o m\u00e9todo mais utilizado \u00e9 o sistema de desgaseifica\u00e7\u00e3o em linha.<\/p>\n

Ao fundir sucata de alum\u00ednio, o processo de remo\u00e7\u00e3o do excesso de hidrog\u00eanio \u00e9 essencial para a produ\u00e7\u00e3o de pe\u00e7as fundidas de alum\u00ednio de qualidade.<\/p>\n

O hidrog\u00eanio \u00e9 introduzido pela umidade. O excesso de hidrog\u00eanio tem um efeito negativo nas propriedades mec\u00e2nicas do alum\u00ednio acabado, causando porosidade e retra\u00e7\u00e3o geral. \u00c9 importante remover o excesso de hidrog\u00eanio durante o processo de fus\u00e3o e vazamento.<\/p>\n

A introdu\u00e7\u00e3o de gases inertes, como o arg\u00f4nio ou o nitrog\u00eanio, no metal fundido pode ser utilizada para remover o hidrog\u00eanio. \u00c0 medida que as bolhas de g\u00e1s inerte sobem pelo alum\u00ednio fundido, o hidrog\u00eanio se difunde para dentro delas e, essencialmente, desaparece. Os sistemas tradicionais de desgaseifica\u00e7\u00e3o limitam a mistura, especialmente na parte inferior, onde s\u00e3o necess\u00e1rias velocidades mais altas, o que resulta em maior turbul\u00eancia superficial. As bolhas s\u00e3o maiores e a desgaseifica\u00e7\u00e3o leva mais tempo para atingir os resultados desejados. Os operadores de fundi\u00e7\u00e3o buscam um cisalhamento e uma dispers\u00e3o superiores das bolhas, maior tempo de reten\u00e7\u00e3o das bolhas no metal, circula\u00e7\u00e3o completa do metal fundido, um rotor que n\u00e3o entupa e maior resist\u00eancia ao choque t\u00e9rmico. Al\u00e9m disso, eles preferem usar menos g\u00e1s inerte no processo.<\/p>\n

\"Sistema<\/p>\n

AdTech sistemas de desgaseifica\u00e7\u00e3o online<\/a> alcan\u00e7ar melhores resultados na desgaseifica\u00e7\u00e3o do alum\u00ednio em menos tempo e com menor custo total.<\/p>\n

A cabe\u00e7a do rotor proporciona maior movimenta\u00e7\u00e3o do metal, lan\u00e7ando-o para fora e puxando-o do fundo para melhorar a circula\u00e7\u00e3o. O movimento rotacional exclusivo da cabe\u00e7a do rotor rompe as bolhas para impedir que o g\u00e1s suba. O rotor, com seu design inteligente, empurra o metal para fora e o puxa do fundo para melhorar o fluxo, aumentando assim a \u00e1rea de superf\u00edcie de rea\u00e7\u00e3o. Ele opera a uma rota\u00e7\u00e3o mais baixa e elimina as \u201czonas mortas\u201d na massa fundida.<\/p>","protected":false},"excerpt":{"rendered":"

Degassing is a technological intermediate step in the production of aluminium between the melting and casting of the metal. Mainly hydrogen has been dissolved in…<\/p>","protected":false},"author":1,"featured_media":7595,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7591","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nDegassing Aluminium with Online Degassing Systems<\/title>\n<meta name=\"description\" content=\"AdTech online degassing systems achieve better degassing aluminium results in less time and with less overall cost. 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