{"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\/fr\/aluminum-casting-degassing-method\/","title":{"rendered":"Proc\u00e9d\u00e9 de d\u00e9gazage de la fonte d'aluminium"},"content":{"rendered":"<p>La concentration maximale d'hydrog\u00e8ne dissous dans l'alliage d'aluminium fondu peut atteindre 0,6 ml de H\u2082\/100 g d'Al. Des op\u00e9rations de fusion minutieuses permettent de r\u00e9duire cette concentration d'hydrog\u00e8ne. Cependant, m\u00eame dans les meilleures conditions, le m\u00e9tal fondu de l'alliage d'aluminium apr\u00e8s refusion peut contenir entre 0,2 et 0,3 ml d'H\u2082\/100 g d'Al. La m\u00e9thode de d\u00e9gazage de la coul\u00e9e d'aluminium consiste \u00e0 injecter un gaz inerte sec dans le m\u00e9tal fondu afin de r\u00e9duire la teneur en hydrog\u00e8ne \u00e0 environ 0,1 ml\/100 g. La solubilit\u00e9 de l\u2019hydrog\u00e8ne \u00e0 l\u2019\u00e9tat liquide et solide varie selon les syst\u00e8mes d\u2019alliages. Lorsque la teneur en hydrog\u00e8ne est de 0,12 ml\/100 g d\u2019Al, l\u2019alliage Al-Si permet de produire des pi\u00e8ces moul\u00e9es exemptes de porosit\u00e9, tandis que l\u2019alliage Al-Cu-Ni \u00e0 faible teneur en silicium, avec une teneur en hydrog\u00e8ne de 0,32 ml\/100 g, ne pr\u00e9sente aucune porosit\u00e9. Si la teneur en hydrog\u00e8ne est trop faible, des d\u00e9fauts de retrait sont in\u00e9vitables.<\/p>\n<p><strong>Proc\u00e9d\u00e9 de d\u00e9gazage de la fonte d'aluminium<\/strong><\/p>\n<p>Pour optimiser l'efficacit\u00e9 de tout proc\u00e9d\u00e9 de d\u00e9gazage, il est n\u00e9cessaire de g\u00e9n\u00e9rer de tr\u00e8s petites bulles de gaz inerte au fond du bain de m\u00e9tal en fusion et de les faire remonter \u00e0 travers l'ensemble du bain d'aluminium en fusion. Dans ce proc\u00e9d\u00e9, la temp\u00e9rature du bain de m\u00e9tal en fusion doit \u00eatre aussi basse que possible. L'AdTech <a href=\"http:\/\/www.alalloycasting.com\/fr\/online-degassing-device\/\">dispositif de d\u00e9gazage en ligne<\/a> permet au gaz inerte de p\u00e9n\u00e9trer dans le m\u00e9tal en fusion par l'interm\u00e9diaire du rotor en graphite en rotation, afin d'assurer le d\u00e9gazage. Le rotor sp\u00e9cialement con\u00e7u divise le gaz inerte en un grand nombre de petites bulles. Lorsque ces petites bulles se d\u00e9placent ou flottent dans le m\u00e9tal en fusion, l\u2019hydrog\u00e8ne dissous se diffuse dans les petites bulles et les suit jusqu\u2019\u00e0 la surface du m\u00e9tal en fusion, d\u2019o\u00f9 il est \u00e9vacu\u00e9 dans l\u2019atmosph\u00e8re. Au cours de leur remont\u00e9e, les petites bulles peuvent \u00e9galement retenir certaines impuret\u00e9s et les acheminer vers la surface du m\u00e9tal en fusion, ce qui permet ensuite d\u2019\u00e9liminer ces inclusions lors de la formation du laitier.<\/p>\n<p>Les \u00e9quipements de d\u00e9gazage de l'aluminium constituent la meilleure solution pour la purification et le d\u00e9gazage de l'aluminium fondu dans l'industrie des alliages d'aluminium. Le gaz est g\u00e9n\u00e9ralement introduit par l'interm\u00e9diaire d'un rotor de d\u00e9gazage, qui r\u00e9duit la taille des bulles et disperse l'azote dans tout le bain de m\u00e9tal fondu.<\/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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