{"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\/fr\/degassing-aluminium\/","title":{"rendered":"D\u00e9gazage de l'aluminium"},"content":{"rendered":"

Le d\u00e9gazage est une \u00e9tape technologique interm\u00e9diaire dans la production de l'aluminium, situ\u00e9e entre la fusion et la coul\u00e9e du m\u00e9tal. L'aluminium liquide contient principalement de l'hydrog\u00e8ne dissous, r\u00e9sultant d'une r\u00e9action avec la vapeur d'eau. Afin d'\u00e9viter la formation de pores lors de la coul\u00e9e, l'hydrog\u00e8ne est \u00e9limin\u00e9 : le m\u00e9tal liquide est alors d\u00e9gaz\u00e9. En r\u00e8gle g\u00e9n\u00e9rale, le d\u00e9gazage s'effectue par injection d'un gaz inerte dans le m\u00e9tal, g\u00e9n\u00e9ralement de l'argon, qui se lie aux bulles d'hydrog\u00e8ne. Pour que le proc\u00e9d\u00e9 industriel soit plus efficace, la taille des bulles d'argon doit \u00eatre aussi petite que possible. \u00c0 l'heure actuelle, la m\u00e9thode la plus r\u00e9pandue est le syst\u00e8me de d\u00e9gazage en ligne.<\/p>\n

Lors de la fusion des d\u00e9chets d'aluminium, le processus d'\u00e9limination de l'exc\u00e8s d'hydrog\u00e8ne est essentiel pour obtenir des pi\u00e8ces moul\u00e9es en aluminium de qualit\u00e9.<\/p>\n

L'hydrog\u00e8ne provient de l'humidit\u00e9. Un exc\u00e8s d'hydrog\u00e8ne a un effet n\u00e9gatif sur les propri\u00e9t\u00e9s m\u00e9caniques de l'aluminium fini, car il entra\u00eene l'apparition de porosit\u00e9 et un retrait global. Il est important d'\u00e9liminer cet exc\u00e8s d'hydrog\u00e8ne pendant les op\u00e9rations de fusion et de coul\u00e9e.<\/p>\n

L'injection de gaz inertes tels que l'argon ou l'azote dans le m\u00e9tal en fusion permet d'\u00e9liminer l'hydrog\u00e8ne. \u00c0 mesure que les bulles de gaz inerte remontent \u00e0 travers l'aluminium en fusion, l'hydrog\u00e8ne se diffuse dans ces bulles et dispara\u00eet pratiquement. Les syst\u00e8mes de d\u00e9gazage traditionnels limitent le m\u00e9lange, en particulier au fond du bain, o\u00f9 des vitesses plus \u00e9lev\u00e9es sont n\u00e9cessaires, ce qui entra\u00eene davantage de turbulences en surface. Les bulles sont plus grosses et le d\u00e9gazage prend plus de temps pour atteindre les r\u00e9sultats souhait\u00e9s. Les fondeurs recherchent un cisaillement et une dispersion sup\u00e9rieurs des bulles, un temps de r\u00e9tention plus long des bulles dans le m\u00e9tal, une circulation compl\u00e8te du m\u00e9tal en fusion, un rotor qui ne s'encrasse pas et une meilleure r\u00e9sistance aux chocs thermiques. De plus, ils pr\u00e9f\u00e9reraient utiliser moins de gaz inerte dans le processus.<\/p>\n

\"Syst\u00e8me<\/p>\n

AdTech syst\u00e8mes de d\u00e9gazage en ligne<\/a> obtenir de meilleurs r\u00e9sultats en mati\u00e8re de d\u00e9gazage de l'aluminium, en moins de temps et \u00e0 moindre co\u00fbt global.<\/p>\n

La t\u00eate de rotor favorise la circulation du m\u00e9tal en le projetant vers l'ext\u00e9rieur et en l'aspirant par le fond, ce qui am\u00e9liore la circulation. Le mouvement de rotation unique de la t\u00eate de rotor brise les bulles pour emp\u00eacher le gaz de remonter. Gr\u00e2ce \u00e0 sa conception ing\u00e9nieuse, le rotor propulse le m\u00e9tal vers l\u2019ext\u00e9rieur et en aspire du fond pour am\u00e9liorer l\u2019\u00e9coulement, augmentant ainsi la surface de r\u00e9action. Il fonctionne \u00e0 un r\u00e9gime inf\u00e9rieur et \u00e9limine les \u201c zones mortes \u201d dans la masse fondue.<\/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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