{"id":11198,"date":"2021-11-14T08:35:55","date_gmt":"2021-11-14T08:35:55","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=11198"},"modified":"2021-11-12T08:41:22","modified_gmt":"2021-11-12T08:41:22","slug":"metal-melt-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/metal-melt-refining\/","title":{"rendered":"Affinage des m\u00e9taux en fusion"},"content":{"rendered":"<p>La plupart des fabricants sp\u00e9cialis\u00e9s dans la coul\u00e9e et le laminage utilisent de l'argon ou de l'azote de haute puret\u00e9 comme gaz vecteur pour l'affinage, et purifient la masse fondue en y injectant des fondants.<\/p>\n<p>Le gaz inerte \u00e9tant insoluble dans l\u2019aluminium, lorsque de petites bulles uniformes de gaz inerte sont introduites dans la solution, la pression de l\u2019hydrog\u00e8ne dans la solution est sup\u00e9rieure \u00e0 celle \u00e0 l\u2019int\u00e9rieur des bulles ; l\u2019hydrog\u00e8ne pr\u00e9sent dans le m\u00e9tal continue donc \u00e0 se diffuser dans les bulles de gaz inerte jusqu\u2019\u00e0 ce que la diff\u00e9rence de pression atteigne z\u00e9ro, permettant ainsi d\u2019atteindre l\u2019\u00e9quilibre. Au cours du processus de flottation des bulles, une partie de l\u2019hydrog\u00e8ne pr\u00e9sent dans la solution est \u00e9limin\u00e9e. En raison de la tension superficielle des bulles, les impuret\u00e9s en suspension dans la solution sont adsorb\u00e9es \u00e0 la surface de celles-ci, et une partie des scories est \u00e9galement \u00e9vacu\u00e9e lors de la flottation. Par cons\u00e9quent, plus le nombre de bulles inject\u00e9es dans le bain fondu est \u00e9lev\u00e9, mieux c\u2019est, et plus elles sont denses, mieux c\u2019est.<\/p>\n<p>L'affinage du m\u00e9tal en fusion repose principalement sur <a href=\"http:\/\/www.alalloycasting.com\/fr\/powder-fluxes\/\">flux en poudre<\/a>, et le flux est principalement constitu\u00e9 de chlorure, de fluorure et de carbonate. C'est gr\u00e2ce \u00e0 l'adsorption, \u00e0 la dissolution et \u00e0 la r\u00e9action chimique des sels, ainsi qu'\u00e0 l'adsorption des bulles de mati\u00e8res volatiles ainsi g\u00e9n\u00e9r\u00e9es, que l'on parvient \u00e0 \u00e9liminer les scories et \u00e0 d\u00e9gazer le m\u00e9lange.<\/p>\n<p>L'aluminium fondu contient de nombreuses inclusions oxyd\u00e9es et une forte teneur en scories. La teneur en inclusions de scories dans l'aluminium primaire \u00e9lectrolytique se situe g\u00e9n\u00e9ralement entre 1% et 2%. Il s'agit d'impuret\u00e9s nuisibles qui, non seulement affectent les performances de la feuille d'aluminium, mais provoquent \u00e9galement facilement des fissures ou des ruptures de bande lors du processus de laminage de la feuille.<\/p>\n<p>L'impuret\u00e9 gazeuse pr\u00e9sente dans l'aluminium liquide \u00e9lectrolytique est principalement constitu\u00e9e d'hydrog\u00e8ne (environ 70% \u00e0 90%). La teneur en hydrog\u00e8ne de la solution d\u2019aluminium \u00e9lectrolytique est sup\u00e9rieure \u00e0 0,30 ml\/(100 g Al). Lorsque le d\u00e9gazage n\u2019est pas complet, l\u2019hydrog\u00e8ne pr\u00e9cipit\u00e9 lors de la solidification de la t\u00f4le coul\u00e9e-lamin\u00e9e s\u2019accumule \u00e0 l\u2019avant de la buse de coul\u00e9e. Lors du laminage de la plaque coul\u00e9e-lamin\u00e9e, celle-ci est continuellement tir\u00e9e vers l\u2019ext\u00e9rieur, ce qui cr\u00e9e un canal d\u2019air. Lorsque le ph\u00e9nom\u00e8ne est l\u00e9ger, les micropores sont comprim\u00e9s les uns contre les autres, formant des stries blanch\u00e2tres \u00e0 la surface de la plaque ; lorsqu\u2019il est important, la plaque se fissure directement et pr\u00e9sente des stries en forme de rainures. L\u2019utilisation de telles t\u00f4les coul\u00e9es-lamin\u00e9es entra\u00eene un gaspillage important d\u00fb aux piq\u00fbres ainsi que la rupture ou la fissuration de la feuille d\u2019aluminium, et ne permet pas de garantir la production de cette derni\u00e8re. Il s\u2019agit l\u00e0 d\u2019un maillon cl\u00e9 qui doit \u00eatre ma\u00eetris\u00e9 au cours de la production.<\/p>","protected":false},"excerpt":{"rendered":"<p>Most of the casting and rolling manufacturers use high-purity argon or nitrogen as the carrier for refining, and purify the melt by blowing fluxes into&hellip;<\/p>","protected":false},"author":1,"featured_media":11201,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[12808,12809],"class_list":["post-11198","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-metal-melt-refining-with-nitrogen","tag-molten-aluminum-flux"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Metal Melt Refining with Nitrogen, Molten Aluminum Flux<\/title>\n<meta name=\"description\" content=\"High-purity 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