{"id":9332,"date":"2021-06-26T05:45:41","date_gmt":"2021-06-26T05:45:41","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9332"},"modified":"2022-03-21T09:12:12","modified_gmt":"2022-03-21T09:12:12","slug":"refining-fluxes-for-foundry","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/refining-fluxes-for-foundry\/","title":{"rendered":"Flux de raffinage pour la fonderie"},"content":{"rendered":"<p>Les flux d'affinage destin\u00e9s \u00e0 la fonderie sont g\u00e9n\u00e9ralement compos\u00e9s de chlorures de m\u00e9taux alcalins ou de m\u00e9taux alcalino-terreux, qui sont m\u00e9lang\u00e9s afin d'obtenir un point de fusion inf\u00e9rieur \u00e0 la temp\u00e9rature de travail de l'alliage \u2014 le point de fusion d'un compos\u00e9 pur \u00e9tant g\u00e9n\u00e9ralement assez \u00e9lev\u00e9. Apr\u00e8s ajout des fondants d'affinage pour fonderie au m\u00e9tal, les impuret\u00e9s et le sel remontent \u00e0 la surface du m\u00e9tal en fusion et peuvent \u00eatre facilement \u00e9limin\u00e9s. La taille des particules est contr\u00f4l\u00e9e par l'utilisation du compos\u00e9 solide obtenu \u00e0 partir du sel fondu.<\/p>\n<p><a href=\"http:\/\/www.alalloycasting.com\/fr\/aluminum-granular-flux\/\">Agents de raffinage granulaires<\/a> peut \u00eatre utilis\u00e9 dans des proc\u00e9d\u00e9s discontinus ou continus.<\/p>\n<p>Il existe diff\u00e9rentes m\u00e9thodes pour incorporer le flux salin dans l'alliage :<\/p>\n<p>Avant d'ajouter l'aluminium, des fondants \u00e0 base de KCl et de MgCl\u2082 sous forme solide ont \u00e9t\u00e9 vers\u00e9s au fond de la cuve de pr\u00e9chauffage.<\/p>\n<p>Actuellement, le <a href=\"http:\/\/www.alalloycasting.com\/fr\/fluxes\/\">flux<\/a> sont ajout\u00e9s \u00e0 l'aide d'un gaz inerte dans le tuyau situ\u00e9 sous la surface du m\u00e9tal (flux pour pistolet de projection).<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10789\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/10\/Aluminum-Alloy-Refining-Fluxes.jpg\" alt=\"Flux de raffinage des alliages d&#039;aluminium\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/10\/Aluminum-Alloy-Refining-Fluxes.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/10\/Aluminum-Alloy-Refining-Fluxes-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Une m\u00e9thode a r\u00e9cemment \u00e9t\u00e9 mise au point, dans laquelle un arbre creux utilise un gaz vecteur pour acheminer le flux de sel dans l'alliage et disperser le <a href=\"http:\/\/www.alalloycasting.com\/fr\/salt-fluxes\/\">flux \u00e0 base de sel<\/a> \u00e0 l'aide d'un agitateur (injection de flux par rotation). Cette m\u00e9thode permet de r\u00e9duire la quantit\u00e9 de flux salin n\u00e9cessaire \u00e0 la purification tout en am\u00e9liorant la dispersion de ce dernier dans l'alliage.<\/p>\n<p>De plus, en raison de l'impact n\u00e9gatif per\u00e7u sur la teneur en sodium de l'aluminium ou de l'alliage d'aluminium obtenu, l'utilisation de fondants salins \u00e0 forte teneur en chlorure de sodium n'est pas recommand\u00e9e. En effet, lorsque du chlorure de sodium est pr\u00e9sent dans le fondant utilis\u00e9 pour purifier l'aluminium ou les alliages d'aluminium, son utilisation est actuellement \u00e9vit\u00e9e ou limit\u00e9e. Plus pr\u00e9cis\u00e9ment, pour certains types d'alliages, tels que les alliages d'aluminium dont la teneur en silicium est sup\u00e9rieure \u00e0 10%, et plus particuli\u00e8rement les alliages d'aluminium dont la teneur en magn\u00e9sium est sup\u00e9rieure \u00e0 3%, il est recommand\u00e9 de ne pas utiliser de chlorure de sodium dans le flux salin.<\/p>","protected":false},"excerpt":{"rendered":"<p>Refining fluxes for foundry are usually composed of alkali metal chlorides or alkaline earth metal chlorides, which are mixed to obtain a melting point below&hellip;<\/p>","protected":false},"author":1,"featured_media":9334,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-9332","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 - 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