{"id":4057,"date":"2020-08-23T09:17:57","date_gmt":"2020-08-23T09:17:57","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4057"},"modified":"2020-08-25T09:03:48","modified_gmt":"2020-08-25T09:03:48","slug":"aluminum-degassing-with-nitrogen","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-degassing-with-nitrogen\/","title":{"rendered":"D\u00e9gazage de l'aluminium \u00e0 l'azote"},"content":{"rendered":"

Le d\u00e9gazage de l'aluminium \u00e0 l'azote est g\u00e9n\u00e9ralement utilis\u00e9 dans le processus de moulage de l'aluminium, car l'azote ne r\u00e9agit pas avec les m\u00e9taux. Afin de r\u00e9duire l'absorption de gaz par l'alliage d'aluminium liquide, les mati\u00e8res premi\u00e8res de l'alliage doivent \u00eatre stock\u00e9es correctement pour \u00e9viter toute exposition \u00e0 l'humidit\u00e9. Il est n\u00e9cessaire de les pr\u00e9chauffer et de les s\u00e9cher avant utilisation. Avant utilisation, le creuset contenant la masse fondue et les outils doivent \u00eatre enti\u00e8rement pr\u00e9chauff\u00e9s afin d'\u00e9liminer toute trace d'humidit\u00e9.<\/p>\n

Afin d'\u00e9liminer les gaz pr\u00e9sents dans l'alliage d'aluminium en fusion, celui-ci doit \u00eatre d\u00e9gaz\u00e9 et affin\u00e9 avant la coul\u00e9e de l'aluminium fondu. AdTech propose unit\u00e9 de d\u00e9gazage en ligne<\/a>, il est principalement utilis\u00e9 pour \u00e9liminer l'hydrog\u00e8ne (H) et les scories de l'aluminium fondu. Il fonctionne selon le principe de la flottation \u00e0 gaz. Le rotor injecte de l'azote dans l'aluminium fondu et divise le gaz en minuscules bulles dispers\u00e9es ; celles-ci remontent \u00e0 la surface de l'aluminium fondu, emportant avec elles l'hydrog\u00e8ne et d'autres impuret\u00e9s.<\/p>\n

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

La pratique industrielle relative aux alliages d'aluminium a d\u00e9montr\u00e9 que l'hydrog\u00e8ne est le seul gaz pouvant se dissoudre en grande quantit\u00e9 dans l'aluminium ou les alliages d'aluminium, et qu'il s'agit \u00e9galement du gaz pr\u00e9sentant la plus grande solubilit\u00e9 dans les alliages d'aluminium.<\/p>\n

Humidit\u00e9 : provenant des gaz du four, d'une charge insuffisante, de l'agent d'affinage, de l'agent de rev\u00eatement, du modificateur, d'un s\u00e9chage insuffisant du rev\u00eatement du four, du creuset et du rev\u00eatement des outils, de l'eau r\u00e9siduelle pr\u00e9sente sur le creuset, les outils et le solvant de chargement, qui r\u00e9agit avec l'aluminium pour produire de l'hydrog\u00e8ne, lequel p\u00e9n\u00e8tre dans l'aluminium liquide \u00e0 l'\u00e9tat atomique.<\/p>\n

D\u00e9gazage de l'aluminium \u00e0 l'azote<\/h2>\n

L'azote est inject\u00e9 au fond de l'aluminium liquide \u00e0 l'aide d'un \u00e9quipement de traitement sp\u00e9cial. L'azote remonte alors du fond de l'aluminium liquide sous forme de bulles. En raison de la diff\u00e9rence de pression partielle d'hydrog\u00e8ne \u00e0 l'interface entre la bulle et l'aluminium fondu, la pression partielle d'hydrog\u00e8ne \u00e0 l'int\u00e9rieur de la bulle est tr\u00e8s faible.<\/p>\n

Lorsque la pression partielle d'hydrog\u00e8ne tend vers l'\u00e9quilibre, l'hydrog\u00e8ne pr\u00e9sent dans le liquide de l'alliage p\u00e9n\u00e8tre en continu dans la bulle. Lorsque la bulle remonte jusqu'au niveau du liquide, l'hydrog\u00e8ne s'\u00e9chappe dans l'atmosph\u00e8re. En remontant, la bulle absorbe simultan\u00e9ment les scories oxyd\u00e9es et les impuret\u00e9s qui y sont fix\u00e9es, et les fait remonter ensemble \u00e0 la surface. Le gaz inerte doit \u00eatre condens\u00e9 et d\u00e9shydrat\u00e9 avant utilisation afin d\u2019emp\u00eacher l\u2019humidit\u00e9 de p\u00e9n\u00e9trer dans l\u2019aluminium liquide. La qualit\u00e9 de l\u2019affinage par d\u00e9gazage est bonne et le nombre de pores doit \u00eatre r\u00e9duit.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum degassing with nitrogen is usually to degas in the aluminum casting process, because nitrogen does not react with metals.\u00a0In order to reduce the gas…<\/p>","protected":false},"author":1,"featured_media":4058,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[4294,396,4287,4274,4288,397,4293,4290,4275,154,4291,4289,4292,4506,398,4284,4282,4285,4281,4283,4280,1485,4286,4295,4297,4298,4296,230,4273,19,4278,4277,4279,4276],"class_list":["post-4057","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-aluminium-degass","tag-aluminium-degassing","tag-aluminium-degassing-flux","tag-aluminium-degassing-methods","tag-aluminium-degassing-nitrogen","tag-aluminium-degassing-process","tag-aluminum-degassing-equipment","tag-aluminum-degassing-flux","tag-aluminum-degassing-methods","tag-aluminum-degassing-process","tag-aluminum-degassing-system","tag-aluminum-degassing-tablets","tag-aluminum-degassing-units","tag-aluminum-degassing-with-nitrogen","tag-degassing-aluminum","tag-degassing-aluminum-alloys","tag-degassing-aluminum-home-foundry","tag-degassing-aluminum-with-argon","tag-degassing-aluminum-with-chlorine","tag-degassing-aluminum-with-potatoes","tag-degassing-aluminum-with-salt","tag-degassing-equipment","tag-degassing-equipment-supplier","tag-degassing-machine","tag-degassing-machine-coimbatore","tag-degassing-machine-parts","tag-degassing-machine-pune","tag-degassing-methods","tag-degassing-methods-in-casting","tag-degassing-unit","tag-degassing-unit-manufacturers","tag-degassing-unit-price","tag-degassing-units","tag-degassing-units-definition"],"yoast_head":"\nAluminum 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