{"id":6556,"date":"2020-11-19T06:53:01","date_gmt":"2020-11-19T06:53:01","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6556"},"modified":"2020-11-19T06:53:01","modified_gmt":"2020-11-19T06:53:01","slug":"aluminum-casting-degassing-method","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-casting-degassing-method\/","title":{"rendered":"M\u00e9todo de desgaseifica\u00e7\u00e3o de pe\u00e7as fundidas de alum\u00ednio"},"content":{"rendered":"<p>A concentra\u00e7\u00e3o m\u00e1xima de hidrog\u00eanio dissolvido na liga de alum\u00ednio fundida pode chegar a 0,6 ml de H\u2082\/100 g de Al. Opera\u00e7\u00f5es cuidadosas de fundi\u00e7\u00e3o podem reduzir a concentra\u00e7\u00e3o de hidrog\u00eanio. Mas mesmo com a melhor opera\u00e7\u00e3o, a liga de alum\u00ednio fundida ap\u00f3s a refundi\u00e7\u00e3o pode conter 0,2 a 0,3 ml de H\u2082\/100 g de Al. O m\u00e9todo de desgaseifica\u00e7\u00e3o da fundi\u00e7\u00e3o de alum\u00ednio consiste em injetar g\u00e1s inerte seco no metal fundido para reduzir o teor de hidrog\u00eanio para cerca de 0,1 ml\/100 g. O hidrog\u00eanio apresenta solubilidade diferente no estado l\u00edquido e no estado s\u00f3lido em diferentes sistemas de ligas. Quando o teor de hidrog\u00eanio \u00e9 de 0,12 ml\/100 g de Al, a liga de Al-Si pode ser usada para produzir pe\u00e7as fundidas sem porosidade, enquanto a liga de Al-Cu-Ni com baixo teor de sil\u00edcio e teor de hidrog\u00eanio de 0,32 ml\/100 g n\u00e3o apresenta porosidade. Se o teor de hidrog\u00eanio for muito baixo, os defeitos de retra\u00e7\u00e3o s\u00e3o inevit\u00e1veis.<\/p>\n<p><strong>M\u00e9todo de desgaseifica\u00e7\u00e3o de pe\u00e7as fundidas de alum\u00ednio<\/strong><\/p>\n<p>Para tornar qualquer processo de desgaseifica\u00e7\u00e3o mais eficaz, \u00e9 necess\u00e1rio gerar bolhas muito pequenas de g\u00e1s inerte no fundo do metal fundido e faz\u00ea-las subir, passando por todas as partes do alum\u00ednio fundido. Nesse processo, a temperatura do metal fundido deve ser a mais baixa poss\u00edvel. A AdTech <a href=\"http:\/\/www.alalloycasting.com\/pt\/online-degassing-device\/\">dispositivo de desgaseifica\u00e7\u00e3o online<\/a> permite que o g\u00e1s inerte entre no metal fundido por meio do rotor girat\u00f3rio de grafite para a desgaseifica\u00e7\u00e3o. O rotor especialmente projetado fragmenta o g\u00e1s inerte em um grande n\u00famero de pequenas bolhas. Quando as pequenas bolhas se movem ou flutuam no metal fundido, o hidrog\u00eanio dissolvido se difunde para dentro delas e as acompanha at\u00e9 a superf\u00edcie do metal fundido, sendo ent\u00e3o liberado na atmosfera. Durante o processo de ascens\u00e3o, as pequenas bolhas tamb\u00e9m podem aderir a algumas impurezas e lev\u00e1-las \u00e0 superf\u00edcie do metal fundido, removendo essas inclus\u00f5es durante a escoria\u00e7\u00e3o.<\/p>\n<p>O equipamento de desgaseifica\u00e7\u00e3o de alum\u00ednio \u00e9 a melhor op\u00e7\u00e3o para a purifica\u00e7\u00e3o e desgaseifica\u00e7\u00e3o do alum\u00ednio fundido na ind\u00fastria de ligas de alum\u00ednio. O g\u00e1s \u00e9 geralmente introduzido por meio de um rotor de desgaseifica\u00e7\u00e3o, que reduz o tamanho das bolhas e dispersa o g\u00e1s nitrog\u00eanio por todo o banho de metal fundido.<\/p>","protected":false},"excerpt":{"rendered":"<p>The highest concentration of hydrogen dissolved in the molten aluminum alloy may be as high as 0.6ml H2\/100g Al. Careful smelting operations can reduce the&hellip;<\/p>","protected":false},"author":1,"featured_media":6557,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6556","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 Casting Degassing Method | Online Rotary Degassing Unit<\/title>\n<meta name=\"description\" content=\"The aluminum casting degassing method is to pass dry inert gas into the molten metal to reduce the hydrogen content to about 0.1ml\/100g.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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