{"id":4023,"date":"2020-08-23T02:33:07","date_gmt":"2020-08-23T02:33:07","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4023"},"modified":"2020-08-23T02:33:07","modified_gmt":"2020-08-23T02:33:07","slug":"aluminum-refining-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-refining-degassing\/","title":{"rendered":"D\u00e9gazage lors de l'affinage de l'aluminium"},"content":{"rendered":"

D\u00e9gazage lors de l'affinage de l'aluminium : dans le processus de fusion des alliages d'aluminium, un fondant d'affinage est ajout\u00e9 au four afin de proc\u00e9der au d\u00e9gazage. Dans les masses fondues d'aluminium et d'alliages d'aluminium, les affineurs permettent d'\u00e9liminer les impuret\u00e9s m\u00e9talliques, les oxydes et autres inclusions oxyd\u00e9es de la masse fondue gr\u00e2ce \u00e0 des interactions physiques, chimiques ou physico-chimiques.<\/p>\n

Les impuret\u00e9s nocives vont r\u00e9agir avec le flux de raffinage<\/a> pour former des compos\u00e9s qui peuvent \u00eatre s\u00e9par\u00e9s de l'aluminium, et qui sont entra\u00een\u00e9s dans les scories d'affinage puis \u00e9limin\u00e9s par adsorption du fondant d'affinage.<\/p>\n

Au cours des op\u00e9rations de d\u00e9gazage et de transport du m\u00e9tal en fusion dans le cadre de l'affinage de l'aluminium, des corps \u00e9trangers tels que la calamine, les compos\u00e9s interm\u00e9talliques et les d\u00e9bris de four sont facilement entra\u00een\u00e9s dans le m\u00e9tal en fusion, o\u00f9 ils forment des inclusions non m\u00e9talliques. Ces inclusions non m\u00e9talliques sont principalement des inclusions d'oxyde. En fonction du moment de leur formation au cours des processus de fusion et de coul\u00e9e, elles peuvent \u00eatre class\u00e9es en inclusions d'oxyde primaires et en inclusions d'oxyde secondaires.<\/p>\n

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

Les inclusions d'oxyde primaires d\u00e9signent principalement toutes les inclusions d'oxyde form\u00e9es avant la coul\u00e9e de l'aluminium fondu. Les inclusions d'oxyde secondaires peuvent \u00eatre class\u00e9es en deux types selon leur forme : d'une part, les grandes inclusions r\u00e9parties de mani\u00e8re in\u00e9gale dans la macrostructure. Certaines inclusions rendent la structure de l'alliage discontinue et r\u00e9duisent l'\u00e9tanch\u00e9it\u00e9 \u00e0 l'air de la pi\u00e8ce, ce qui favorise la corrosion. La diminution de la r\u00e9sistance et de la plasticit\u00e9 de l\u2019alliage d\u2019aluminium est souvent la cause premi\u00e8re des fissures des pi\u00e8ces. Le deuxi\u00e8me type d\u2019inclusions d\u2019oxyde est constitu\u00e9 de petites inclusions dispers\u00e9es, qui ne peuvent \u00eatre compl\u00e8tement \u00e9limin\u00e9es m\u00eame apr\u00e8s une purification minutieuse. Elles augmentent la viscosit\u00e9 du m\u00e9tal en fusion, r\u00e9duisent la capacit\u00e9 d\u2019alimentation de l\u2019aluminium en fusion pendant la solidification et provoquent facilement un retrait de coul\u00e9e.<\/p>\n

Les inclusions d'oxyde secondaires, \u00e9galement appel\u00e9es inclusions endog\u00e8nes, se forment principalement lors du processus de coul\u00e9e. Les inclusions endog\u00e8nes sont g\u00e9n\u00e9ralement r\u00e9parties de mani\u00e8re plus homog\u00e8ne et se composent de particules plus fines. La turbulence provoqu\u00e9e par les projections d\u2019aluminium fondu lors de la coul\u00e9e r\u00e9sulte de l\u2019interaction entre l\u2019alumine pr\u00e9sente dans le moule en sable et l\u2019eau contenue dans le sable de moulage ; cette eau se d\u00e9compose alors en oxyg\u00e8ne et en hydrog\u00e8ne. L\u2019oxyg\u00e8ne r\u00e9agit avec l\u2019aluminium pour former des inclusions d\u2019oxyde, tandis que l\u2019hydrog\u00e8ne d\u00e9compose l\u2019aluminium fondu.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum Refining Degassing: in the smelting process of aluminum alloy, refining flux is added to the furnace for degassing processing. In aluminum and aluminum alloy…<\/p>","protected":false},"author":1,"featured_media":4024,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4499],"class_list":["post-4023","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-refining-degassing"],"yoast_head":"\nAluminum Refining Degassing with the refining flux<\/title>\n<meta name=\"description\" content=\"Aluminum Refining Degassing: in the smelting process of aluminum alloy, refining flux is added to the furnace for degassing processing.\" \/>\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\/aluminum-refining-degassing\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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