unit\u00e9 de d\u00e9gazage<\/a> pour l'aluminium fondu est plac\u00e9 entre le four de maintien et la machine de coul\u00e9e. De l'azote est inject\u00e9 dans l'alliage d'aluminium fondu, puis fragment\u00e9 par un rotor en graphite en rotation situ\u00e9 dans la cuve de d\u00e9gazage. Il en r\u00e9sulte la formation d'un grand nombre de bulles dispers\u00e9es, ce qui permet \u00e0 l'alliage d'aluminium liquide d'entrer en contact total avec l'azote dans la cuve de traitement. Conform\u00e9ment au principe de la diff\u00e9rence de pression et de l'adsorption en surface, les bulles absorbent l'hydrog\u00e8ne et les scories d'oxyde. Elles remontent ensuite \u00e0 la surface du bain fondu pour former une \u00e9cume. L'alliage d'aluminium fondu s'\u00e9coule ensuite de la sortie de l'unit\u00e9 de d\u00e9gazage vers la machine de coul\u00e9e afin de purifier l'alliage d'aluminium.<\/p>\nLe processus d'\u00e9limination de l'hydrog\u00e8ne est appel\u00e9 \u00ab d\u00e9gazage \u00bb. L'une des m\u00e9thodes de d\u00e9gazage les plus efficaces pour l'aluminium consiste \u00e0 utiliser de l'azote, un gaz inerte sec, dans le cadre d'un d\u00e9gazage rotatif inerte. Le principe cl\u00e9 du d\u00e9gazage rotatif r\u00e9side dans la capacit\u00e9 du rotor \u00e0 briser les grosses bulles de gaz inerte en tr\u00e8s petites bulles, et \u00e0 les faire se diffuser dans l'ensemble du m\u00e9tal en fusion. La r\u00e9duction du diam\u00e8tre des bulles entra\u00eene une augmentation consid\u00e9rable de la surface sp\u00e9cifique du gaz inerte, ce qui permet \u00e0 davantage de surfaces de gaz inerte d'entrer en contact avec l'hydrog\u00e8ne et les impuret\u00e9s pr\u00e9sents dans le m\u00e9tal en fusion ; l'hydrog\u00e8ne et les impuret\u00e9s sont ainsi \u00e9limin\u00e9s de l'aluminium en fusion \u00e0 mesure que les bulles remontent \u00e0 la surface.<\/p>\n
![\"M\u00e9thode](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/10\/Degassing-Method-of-Aluminum-2.jpg\")
<\/p>\n
Principe de d\u00e9gazage<\/strong><\/p>\nL'hydrog\u00e8ne dissous se d\u00e9placera de la zone \u00e0 forte concentration (dans la masse fondue) vers la zone \u00e0 faible concentration (dans le gaz inerte). L'hydrog\u00e8ne se dispersera dans le m\u00e9tal fondu au fur et \u00e0 mesure de son d\u00e9gagement dans tout espace confin\u00e9. Il maintiendra une concentration constante dans l'ensemble de la masse fondue. La vitesse de migration de l'hydrog\u00e8ne dans l'aluminium fondu est presque aussi rapide que celle dans l'air. Il n'est donc pas n\u00e9cessaire d'exposer chaque once de m\u00e9tal \u00e0 des gaz inertes.<\/p>\n
L'efficacit\u00e9 du d\u00e9gazage de l'aluminium d\u00e9pend de deux facteurs : la vitesse de transfert \u00e0 l'interface m\u00e9tal\/gaz et la surface totale sur laquelle ce transfert peut s'effectuer.<\/p>","protected":false},"excerpt":{"rendered":"
The degassing method of aluminum is to reduce the hydrogen (gas content) in aluminum melt before casting, which is one of the most important parts…<\/p>","protected":false},"author":1,"featured_media":5712,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5679","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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