{"id":7217,"date":"2020-12-25T03:27:53","date_gmt":"2020-12-25T03:27:53","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7217"},"modified":"2021-04-12T03:57:31","modified_gmt":"2021-04-12T03:57:31","slug":"molten-metal-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-metal-refining\/","title":{"rendered":"Affinage des m\u00e9taux en fusion"},"content":{"rendered":"<p>Au cours des op\u00e9rations d'affinage et de transport du m\u00e9tal en fusion, des corps \u00e9trangers tels que la cro\u00fbte d'oxyde, les compos\u00e9s interm\u00e9talliques et les fragments de sole sont facilement entra\u00een\u00e9s dans le m\u00e9tal en fusion pour former des inclusions non m\u00e9talliques. Ces inclusions non m\u00e9talliques sont principalement des inclusions d'oxyde. En fonction de la p\u00e9riode de formation au cours des processus de fusion et de coul\u00e9e, elles peuvent \u00eatre class\u00e9es en inclusions d\u2019oxyde primaires et en inclusions d\u2019oxyde secondaires.<\/p>\n<p>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 primaires 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. Ce type d\u2019inclusions rend la structure de l\u2019alliage discontinue, r\u00e9duit l\u2019\u00e9tanch\u00e9it\u00e9 \u00e0 l\u2019air de la pi\u00e8ce et constitue une source de corrosion. Elles r\u00e9duisent consid\u00e9rablement la r\u00e9sistance et la plasticit\u00e9 des alliages d\u2019aluminium et sont souvent \u00e0 l\u2019origine de fissures dans les pi\u00e8ces. Le deuxi\u00e8me type d\u2019inclusions d\u2019oxyde d\u00e9signe les 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 et r\u00e9duisent la capacit\u00e9 d\u2019alimentation de l\u2019aluminium en fusion pendant la solidification, ce qui peut facilement entra\u00eener un retrait des pi\u00e8ces moul\u00e9es.<\/p>\n<p>Les inclusions d'oxyde secondaires, \u00e9galement appel\u00e9es inclusions endog\u00e8nes, se forment principalement au cours du processus de coul\u00e9e. En g\u00e9n\u00e9ral, la r\u00e9partition des inclusions endog\u00e8nes est relativement uniforme et les particules sont relativement petites. Les projections et les turbulences de l'aluminium fondu pendant la coul\u00e9e constituent les principales sources d'inclusions d'oxyde secondaires. Dans le moule en sable, l'aluminium fondu r\u00e9agit avec l'humidit\u00e9 pr\u00e9sente dans le sable, et l'eau se d\u00e9compose en oxyg\u00e8ne et en hydrog\u00e8ne. L'oxyg\u00e8ne r\u00e9agit avec l'aluminium pour former des inclusions d'oxyde, tandis que l'hydrog\u00e8ne se dissout dans l'aluminium fondu.<\/p>\n<p>M\u00e9tal en fusion <a href=\"http:\/\/www.alalloycasting.com\/fr\/refining-flux\/\">flux de raffinage<\/a> est principalement utilis\u00e9 pour \u00e9liminer les inclusions d'oxyde primaire dans les fours. <a href=\"http:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filter-cff\/\">Filtre en mousse c\u00e9ramique<\/a> Il permet de filtrer les inclusions pr\u00e9sentes dans le m\u00e9tal en fusion ; il est principalement utilis\u00e9 pour \u00e9liminer les inclusions d'oxydes secondaires.<\/p>","protected":false},"excerpt":{"rendered":"<p>In the process of refining and transportation of molten metal, foreign matter such as oxide scale, intermetallic compounds, and hearth fragments are easily brought into&hellip;<\/p>","protected":false},"author":1,"featured_media":7218,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7217","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Molten Metal Refining with Flux and Ceramic Foam Filter<\/title>\n<meta name=\"description\" content=\"Molten metal refining flux is mainly used for primary oxide inclusions removal. Ceramic foam filter can filter inclusions in molten metal.\" \/>\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\/molten-metal-refining\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Molten Metal Refining with Flux and Ceramic Foam Filter\" \/>\n<meta property=\"og:description\" content=\"Molten metal refining flux is mainly used for primary oxide inclusions removal. 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