{"id":10640,"date":"2021-10-15T05:36:33","date_gmt":"2021-10-15T05:36:33","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10640"},"modified":"2021-10-15T05:36:33","modified_gmt":"2021-10-15T05:36:33","slug":"molten-aluminum-flux-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-aluminum-flux-refining\/","title":{"rendered":"Affinage de l'aluminium fondu \u00e0 l'aide d'un fondant"},"content":{"rendered":"

La m\u00e9thode la plus largement admise et la plus couramment utilis\u00e9e pour \u00e9liminer les inclusions, telles que les films d'oxyde, de l'aluminium fondu est l'affinage par fondant.<\/p>\n

La composition chimique du flux d\u00e9pend des objectifs du processus de coul\u00e9e (\u00e9limination des alcalis, propret\u00e9, s\u00e9paration des scories). Les flux \u00e0 base de Na\u2082SO\u2084 et de NaCl sont utilis\u00e9s pour r\u00e9duire le pourcentage d'inclusions d'oxydes dans l'aluminium fondu en les fixant \u00e0 la surface de la masse fondue.<\/p>\n

Parce que l'ajout de flux de raffinage<\/a> dans les pi\u00e8ces moul\u00e9es en aluminium permet de r\u00e9duire les inclusions, ce qui am\u00e9liore la fluidit\u00e9 du m\u00e9tal.<\/p>\n

La fluidit\u00e9 est la capacit\u00e9 d'un m\u00e9tal liquide \u00e0 s'\u00e9couler \u00e0 sa temp\u00e9rature de fusion avant que cet \u00e9coulement ne s'arr\u00eate en raison de la solidification. L'influence des inclusions sur la fluidit\u00e9 est telle que celle de l'aluminium pur est consid\u00e9rablement r\u00e9duite en raison de la pr\u00e9sence d'inclusions d'oxyde, car celles-ci bloquent l'\u00e9coulement du m\u00e9tal liquide. La fluidit\u00e9 de l'\u00e9chantillon augmente avec l'ajout de fondant.<\/p>\n

Les oxydes constituent les inclusions les plus courantes dans le processus de moulage des m\u00e9taux. Si l'aluminium fondu ne subit pas un traitement d'affinage ad\u00e9quat, des inclusions d'oxyde subsisteront dans le lingot d'aluminium moul\u00e9, ce qui entra\u00eenera in\u00e9vitablement de nombreux probl\u00e8mes, tels qu'une diminution des propri\u00e9t\u00e9s m\u00e9caniques, une mauvaise usinabilit\u00e9 et une qualit\u00e9 de surface m\u00e9diocre. Afin de r\u00e9duire la pr\u00e9sence de d\u00e9fauts dans le produit final, il est important d'utiliser, lors du processus de coul\u00e9e, de l'aluminium fondu ne contenant aucune impuret\u00e9.<\/p>\n

\"\"<\/p>\n

L'aluminium recycl\u00e9 est de l'aluminium obtenu par des proc\u00e9d\u00e9s de recyclage dont la principale source est la ferraille d'aluminium. L'utilisation de ferraille d'aluminium dans le processus de recyclage pr\u00e9sente un inconv\u00e9nient, car celle-ci contient de nombreux \u00e9l\u00e9ments d'impuret\u00e9 qui ne sont pas souhaitables dans la fonderie. Ces impuret\u00e9s sont consid\u00e9r\u00e9es comme des inclusions ind\u00e9sirables et nuisent \u00e0 la qualit\u00e9 du produit final. Dans le processus de moulage des m\u00e9taux, les inclusions peuvent entra\u00eener des d\u00e9fauts, r\u00e9duisant ainsi la qualit\u00e9 du produit final.<\/p>\n

L'ajout de fondant am\u00e9liore la qualit\u00e9 de l'aluminium fondu pendant le processus de coul\u00e9e. Cela s'explique par l'action du fondant, qui fixe les inclusions d'oxyde pr\u00e9sentes dans le m\u00e9tal fondu \u00e0 la surface. \u00c0 mesure que le pourcentage en poids et la temp\u00e9rature de fusion du fondant augmentent jusqu'\u00e0 atteindre leur point optimal, les inclusions d'oxyde diminuent. Le traitement d'affinage par fondant de l'aluminium fondu est le plus efficace pour \u00e9liminer les inclusions d'oxyde.<\/p>","protected":false},"excerpt":{"rendered":"

The most widely accepted and most commonly used method for removing inclusions such as oxide films from molten aluminum is flux refining. The chemical composition…<\/p>","protected":false},"author":1,"featured_media":10643,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10640","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nMolten Aluminum Flux Refining, Fluxes for Metal Casting<\/title>\n<meta name=\"description\" content=\"The most widely accepted and most commonly used method for removing inclusions such as oxide films from molten aluminum is flux refining.\" \/>\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-aluminum-flux-refining\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Molten 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