{"id":12266,"date":"2022-01-13T06:56:36","date_gmt":"2022-01-13T06:56:36","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=12266"},"modified":"2022-02-22T09:25:45","modified_gmt":"2022-02-22T09:25:45","slug":"aluminium-casting-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminium-casting-degassing\/","title":{"rendered":"D\u00e9gazage des pi\u00e8ces moul\u00e9es en aluminium"},"content":{"rendered":"

Le d\u00e9gazage des pi\u00e8ces moul\u00e9es en aluminium peut consid\u00e9rablement am\u00e9liorer la qualit\u00e9 et le rendement des produits en aluminium, ce qui permet d'accro\u00eetre la rentabilit\u00e9 des fonderies et des usines de moulage d'aluminium.<\/span><\/p>\n

L'hydrog\u00e8ne peut \u00eatre br\u00fbl\u00e9 dans une cuisini\u00e8re \u00e0 gaz, et les condensats provenant des outils, flux de raffinage<\/a> et additifs d'alliage<\/a> sont introduits dans l'aluminium liquide.<\/span><\/p>\n

Le plus souvent, cependant, l'hydrog\u00e8ne est introduit dans l'aluminium fondu par l'humidit\u00e9 atmosph\u00e9rique.<\/span> La solubilit\u00e9 de l'hydrog\u00e8ne augmente avec l'humidit\u00e9 relative de l'atmosph\u00e8re.<\/span><\/p>\n

Compte tenu de sa l\u00e9g\u00e8ret\u00e9, l'aluminium est un m\u00e9tal souvent utilis\u00e9 en raison de sa r\u00e9sistance relative.<\/span><\/p>\n

Cependant, lors de la coul\u00e9e de l'aluminium, des impuret\u00e9s appel\u00e9es \u00ab inclusions \u00bb peuvent cr\u00e9er des points de faiblesse dans le produit.<\/span><\/p>\n

Ces inclusions ont de nombreuses causes, mais la pr\u00e9sence d'hydrog\u00e8ne est l'une des plus courantes.<\/span><\/p>\n

L'hydrog\u00e8ne est soluble dans l'aluminium liquide, qu'il traverse presque aussi facilement que l'air.<\/span><\/p>\n

\u00c0 mesure que le m\u00e9tal liquide se refroidit et se solidifie, l'hydrog\u00e8ne s'\u00e9coule des zones de haute pression vers celles de basse pression.<\/span><\/p>\n

Il s'agglom\u00e8re et forme des poches d'air qui, lors de la solidification du m\u00e9tal, se transforment en inclusions et en points de faiblesse.<\/span><\/p>\n

Le d\u00e9gazage de la fonte d'aluminium est un proc\u00e9d\u00e9 utilis\u00e9 pour \u00e9liminer l'hydrog\u00e8ne de l'aluminium fondu.<\/span><\/strong><\/p>\n

\"D\u00e9gazage<\/p>\n

\u00c0 mesure que la demande en produits en aluminium de haute qualit\u00e9 augmente, notamment dans le secteur a\u00e9rospatial, il devient de plus en plus n\u00e9cessaire de r\u00e9duire les inclusions dans les pi\u00e8ces moul\u00e9es.<\/span><\/p>\n

Une m\u00e9thode couramment utilis\u00e9e pour \u00e9liminer l'hydrog\u00e8ne consiste \u00e0 injecter de l'azote gazeux dans l'aluminium liquide.<\/span><\/p>\n

L'hydrog\u00e8ne est attir\u00e9 par la bulle d'azote, qui est ensuite absorb\u00e9e par l'aluminium puis lib\u00e9r\u00e9e \u00e0 la surface.<\/span><\/p>\n

L'argon est \u00e9galement tr\u00e8s efficace, mais on privil\u00e9gie l'azote en raison du co\u00fbt \u00e9lev\u00e9 de ce gaz.<\/span><\/p>\n

Dispositif de d\u00e9gazage<\/a> Il s'agit d'un syst\u00e8me automatique de traitement des m\u00e9taux en fusion destin\u00e9 \u00e0 la protection de l'environnement, au d\u00e9gazage et \u00e0 l'\u00e9limination des scories des alliages d'aluminium.<\/span><\/p>\n

Le dispositif de d\u00e9gazage fonctionne selon le principe de la turbine \u00e0 ailettes : son rotor g\u00e9n\u00e8re de minuscules bulles de gaz inerte et les m\u00e9lange au m\u00e9tal liquide.<\/span> Ces fines bulles sont r\u00e9parties uniform\u00e9ment dans le m\u00e9tal liquide sans perturber l'\u00e9quilibre de la surface, ce qui optimise la surface de contact entre le gaz et le m\u00e9tal liquide.<\/span> La grande efficacit\u00e9 de l'unit\u00e9 de d\u00e9gazage permet d'obtenir des niveaux plus \u00e9lev\u00e9s de d\u00e9gazage et d'\u00e9limination des scories, ainsi que des dur\u00e9es de traitement plus courtes.<\/span><\/p>","protected":false},"excerpt":{"rendered":"

Aluminium Casting Degassing can greatly improve the quality and output of aluminum products, thus improving the profitability of aluminum smelting and casting plants. Hydrogen can…<\/p>","protected":false},"author":1,"featured_media":12267,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-12266","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminium Casting Degassing for Removing Hydrogen<\/title>\n<meta name=\"description\" content=\"Aluminium Casting Degassing can improve the quality and output of aluminum products, thus improving the profitability of aluminum smelting.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/aluminium-casting-degassing\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aluminium Casting 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