{"id":7300,"date":"2020-12-30T03:07:54","date_gmt":"2020-12-30T03:07:54","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7300"},"modified":"2025-08-27T09:55:49","modified_gmt":"2025-08-27T09:55:49","slug":"degassing-of-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-of-molten-aluminum\/","title":{"rendered":"D\u00e9gazage de l'aluminium fondu"},"content":{"rendered":"

D\u00e9gazage de l'aluminium fondu<\/h1>\n

Le d\u00e9gazage d'un alliage d'aluminium fondu est un proc\u00e9d\u00e9 de coul\u00e9e visant \u00e0 \u00e9liminer l'hydrog\u00e8ne dissous dans la masse fondue.<\/p>\n

L'aluminium liquide dissout activement l'hydrog\u00e8ne, et la solubilit\u00e9 de l'hydrog\u00e8ne gazeux au point de fusion de l'aluminium liquide est de 2,2 cm\u00b3\/100 g.<\/p>\n

Lorsque l'aluminium se solidifie, la solubilit\u00e9 de l'hydrog\u00e8ne gazeux diminue fortement : l'aluminium, qui pr\u00e9sente un point de fusion solide, ne contient que 0,05 cm\u00b3\/100 g d'hydrog\u00e8ne.<\/p>\n

Par cons\u00e9quent, l'alliage d'aluminium lib\u00e8re un exc\u00e8s d'hydrog\u00e8ne au cours du processus de solidification. Cela entra\u00eene l'apparition de d\u00e9fauts de porosit\u00e9 r\u00e9partis dans l'ensemble du m\u00e9tal solidifi\u00e9. La taille et le nombre des pores d'hydrog\u00e8ne d\u00e9pendent de la teneur initiale en hydrog\u00e8ne, de la composition de l'alliage et des conditions de solidification.<\/p>\n

D\u00e9gazage de l'aluminium fondu \u00e0 l'aide d'un flux<\/h2>\n

Un flux compos\u00e9 de sels contenant du chlore et du fluor est utilis\u00e9 pour le d\u00e9gazage des alliages d'aluminium fondus. Flux de d\u00e9gazage<\/a> se pr\u00e9sente g\u00e9n\u00e9ralement sous forme de poudre ou de granul\u00e9s.<\/p>\n

Lorsque les pastilles de flux sont immerg\u00e9es dans le fond du four \u00e0 l'aide d'une cloche perfor\u00e9e propre et pr\u00e9chauff\u00e9e, l'op\u00e9ration de d\u00e9gazage commence. Les composants du flux r\u00e9agissent avec l'aluminium pour former des compos\u00e9s gazeux (chlorure d'aluminium, fluorure d'aluminium). Les bulles de gaz remontent dans la masse fondue. La pression partielle d\u2019hydrog\u00e8ne dans les bulles form\u00e9es est tr\u00e8s faible, ce qui permet \u00e0 l\u2019hydrog\u00e8ne de se diffuser depuis l\u2019aluminium fondu vers les bulles. Les bulles s\u2019\u00e9chappent de la masse fondue puis passent par le syst\u00e8me d\u2019\u00e9vacuation afin d\u2019\u00e9liminer le gaz. Ce processus se poursuit jusqu\u2019\u00e0 ce que le bouillonnement cesse.<\/p>\n

\"Flux<\/p>\n

D\u00e9gazeur rotatif<\/h2>\n

Dans le proc\u00e9d\u00e9 de d\u00e9gazage rotatif, un gaz inerte ou chimiquement inerte (argon, azote) est inject\u00e9 \u00e0 travers l'arbre rotatif et le rotor. L'\u00e9nergie de l'arbre rotatif entra\u00eene la formation d'un grand nombre de petites bulles, ce qui permet d'obtenir un rapport surface\/volume tr\u00e8s \u00e9lev\u00e9.<\/p>\n

D\u00e9gazage rotatif<\/a> Cette technologie \u00e9limine ces composants ind\u00e9sirables en faisant passer un gaz, g\u00e9n\u00e9ralement de l'azote, \u00e0 travers le m\u00e9tal en fusion. 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 en fusion. Lorsque les bulles ainsi g\u00e9n\u00e9r\u00e9es remontent \u00e0 travers la masse de m\u00e9tal en fusion, elles absorbent l'hydrog\u00e8ne dissous dans le m\u00e9tal et l'\u00e9liminent de la masse fondue. De plus, les particules solides non m\u00e9talliques sont entra\u00een\u00e9es vers la surface par l'effet de flottation des bulles, puis peuvent \u00eatre \u00e9limin\u00e9es par \u00e9cumage du m\u00e9tal.<\/p>","protected":false},"excerpt":{"rendered":"

Degassing molten aluminium Degassing of molten aluminum alloy is a casting process designed to remove hydrogen dissolved in the melt. Liquid aluminum will actively dissolve…<\/p>","protected":false},"author":1,"featured_media":7301,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[94,4488,4491,1755,4484,4490,659,1485,4486,4489,4481,4480,4482,4493,4487,95,1487,8303,31,4492,4485,4483],"class_list":["post-7300","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-degassing-machine","tag-aluminium-degassing-treatment","tag-aluminium-liquid-degasser","tag-aluminum-degassing-treatment","tag-degasser-machine-at-best-price","tag-degassing-and-purification-system","tag-degassing-box","tag-degassing-equipment","tag-degassing-machine-degassing","tag-degassing-system-for-aluminium","tag-dual-rotor-online-al-melt-degasser","tag-dual-rotors-degassing-machine","tag-dual-rotor-online-degasser","tag-flux-injection-rotary-degasser","tag-in-line-degassing-equipment","tag-metal-degassing-systems","tag-molten-aluminium-degassing-machine","tag-molten-aluminium-degassing-refining-machine","tag-molten-aluminum-refining-degassing","tag-online-degassing-unit","tag-rotary-degassing-and-fluxing-unit-for-aluminum-alloys","tag-spinning-rotor-degassing"],"yoast_head":"\nDegassing 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