{"id":1239,"date":"2020-04-17T09:48:50","date_gmt":"2020-04-17T09:48:50","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=1239"},"modified":"2020-08-28T06:24:09","modified_gmt":"2020-08-28T06:24:09","slug":"degassing-in-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-in-casting\/","title":{"rendered":"D\u00e9gazage lors de la coul\u00e9e"},"content":{"rendered":"

L'aluminium est un m\u00e9tal souvent utilis\u00e9 pour sa r\u00e9sistance relative compte tenu de sa l\u00e9g\u00e8ret\u00e9. Cependant, lors de la coul\u00e9e de l'aluminium, des impuret\u00e9s appel\u00e9es \u00ab inclusions \u00bb peuvent cr\u00e9er des points faibles dans le produit. Ces inclusions entra\u00eenent des d\u00e9fauts dans la structure de la pi\u00e8ce moul\u00e9e en alliage d'aluminium. La demande en produits en aluminium de meilleure qualit\u00e9 ne cessant de cro\u00eetre, notamment dans l\u2019industrie a\u00e9rospatiale, les exigences en mati\u00e8re de qualit\u00e9 des produits en alliage d\u2019aluminium augmentent elles aussi. Afin d'\u00e9liminer les impuret\u00e9s de la masse fondue et d'obtenir ainsi un aluminium plus pur et de meilleure qualit\u00e9, l'une des m\u00e9thodes de purification les plus efficaces est le d\u00e9gazage de l'aluminium. Le d\u00e9gazage lors de la coul\u00e9e est donc essentiel pour \u00e9liminer au pr\u00e9alable l'hydrog\u00e8ne et les inclusions non m\u00e9talliques du m\u00e9tal en fusion.<\/p>\n

D\u00e9gazage lors de la coul\u00e9e<\/h2>\n

Le d\u00e9gazage de l'aluminium repose sur le principe selon lequel l'hydrog\u00e8ne gazeux dissous se d\u00e9place d'une zone de forte concentration (dans la masse fondue) vers une zone de faible concentration (dans le gaz inerte). L'hydrog\u00e8ne gazeux se disperse dans le m\u00e9tal en fusion comme il le ferait s'il \u00e9tait lib\u00e9r\u00e9 dans n'importe quel espace confin\u00e9. Il maintient ainsi une concentration constante dans toute la masse fondue.<\/p>\n

L'hydrog\u00e8ne gazeux peut se d\u00e9placer dans un m\u00e9tal liquide presque aussi rapidement que dans l'air. Il n'est donc pas n\u00e9cessaire de mettre chaque once de m\u00e9tal en contact avec le gaz inerte. L'efficacit\u00e9 du d\u00e9gazage de l'aluminium d\u00e9pend de deux facteurs : le taux de transfert \u00e0 l'interface m\u00e9tal\/gaz et la surface totale disponible pour ce transfert.<\/p>\n

Les syst\u00e8mes traditionnels de d\u00e9gazage de l'hydrog\u00e8ne faisaient passer des gaz sp\u00e9ciaux (chlore, fr\u00e9on ou SF\u2086) \u00e0 travers le m\u00e9tal afin d'acc\u00e9l\u00e9rer le transfert de l'hydrog\u00e8ne \u00e0 l'interface m\u00e9tal-gaz sous forme de grosses bulles. Il existait une limite pratique \u00e0 l'\u00e9limination de l'hydrog\u00e8ne les jours humides, car lorsque ces grosses bulles \u00e9clataient \u00e0 la surface, cela cr\u00e9ait une surface m\u00e9tallique plus importante, qui absorbait alors davantage d'hydrog\u00e8ne pr\u00e9sent dans l'atmosph\u00e8re humide.<\/p>\n

\"D\u00e9gazeur
D\u00e9gazeur pour aluminium liquide<\/figcaption><\/figure>\n

Fabricant d'unit\u00e9s de d\u00e9gazage<\/h2>\n

AdTech est depuis longtemps consciente de la n\u00e9cessit\u00e9 d'un traitement efficace au gaz de flux pour \u00e9liminer l'hydrog\u00e8ne et les inclusions. L'unit\u00e9 de d\u00e9gazage en ligne d'AdTech permet donc de r\u00e9pondre \u00e0 cette exigence et d'atteindre la meilleure efficacit\u00e9 de d\u00e9gazage possible. Le d\u00e9gazage rotatif constitue une avanc\u00e9e majeure en mati\u00e8re de d\u00e9gazage automatis\u00e9, efficace et \u00e9conomique. Le principe de fonctionnement des machines de d\u00e9gazage repose sur un rotor capable de g\u00e9n\u00e9rer des bulles tr\u00e8s fines de gaz inertes, qui sont r\u00e9parties de mani\u00e8re homog\u00e8ne et constante dans tout le bain de m\u00e9tal.<\/p>\n

Unit\u00e9 de d\u00e9gazage<\/a> est dot\u00e9 d'un corps de four \u00e0 dur\u00e9e de vie ultra-longue, fabriqu\u00e9 selon une nouvelle technologie de fabrication \u00e0 partir d'un mat\u00e9riau fondu \u00e0 haute teneur en silicium. Le rotor de d\u00e9gazage, le manchon de protection du dispositif de chauffage et le manchon de protection du thermocouple sont tous fabriqu\u00e9s \u00e0 partir d\u2019une technologie de fabrication c\u00e9ramique \u00e0 base de nitrure de silicium (Si\u2083N\u2084). Cela permet d\u2019\u00e9liminer l\u2019hydrog\u00e8ne et les autres r\u00e9sidus contenus dans l\u2019aluminium fondu et ses alliages, qui nuisent \u00e0 leur qualit\u00e9 et \u00e0 leurs propri\u00e9t\u00e9s m\u00e9caniques.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum is a metal used often for its relative strength given its lightweight. When aluminum is cast, however, impurities known as inclusions can create weak…<\/p>","protected":false},"author":1,"featured_media":4272,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18,138],"tags":[1248,1256,1249,1237,1240,1244,1243,116,1246,1255,1247,1250,1252,1236,1232,1238,1239,1251,1231,1230,1233,1234,1242,1235,1241,1253,1254],"class_list":["post-1239","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-degassing-unit","category-seo","tag-degassing-in-aluminium-strip","tag-degassing-in-aluminum-billet-casting","tag-degassing-in-aluminum-ingot","tag-degassing-in-aluminum-metallurgy","tag-degassing-in-aluminum-or-aluminium","tag-degassing-in-cast-aluminum","tag-degassing-in-castable-refractory","tag-degassing-in-casting","tag-degassing-in-ceramic-insulation","tag-degassing-in-ceramic-shell-casting","tag-degassing-in-continuous-casting","tag-degassing-in-foundry","tag-degassing-in-foundry-factory","tag-degassing-in-liquid-aluminum","tag-degassing-in-materials-and-metallurgy","tag-degassing-in-melting-aluminum","tag-degassing-in-melting-point-of-aluminum","tag-degassing-in-metal-foundry","tag-degassing-in-metal-metallurgy","tag-degassing-in-metallurgical-engineering","tag-degassing-in-metallurgical-industry","tag-degassing-in-metallurgical-products","tag-degassing-in-metallurgy-company","tag-degassing-in-metallurgy-of-aluminium","tag-degassing-in-molten-aluminum","tag-degassing-in-shell-casting","tag-degassing-in-shell-mould-casting"],"yoast_head":"\nDegassing 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