{"id":6445,"date":"2020-11-13T08:48:28","date_gmt":"2020-11-13T08:48:28","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6445"},"modified":"2020-11-13T08:48:28","modified_gmt":"2020-11-13T08:48:28","slug":"aluminum-alloy-fluxes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-alloy-fluxes\/","title":{"rendered":"Flux pour alliages d'aluminium"},"content":{"rendered":"

\u00c0 l'heure actuelle, les fondants \u00e0 base d'alliages d'aluminium se r\u00e9partissent principalement en deux syst\u00e8mes : le syst\u00e8me NaCl-KCl et le syst\u00e8me KCl-MgCl\u2082. Le premier contient du sodium (Na) ; le m\u00e9lange \u00e9quimolaire de NaCl et de KCl forme un eutectique \u00e0 bas point de fusion (665 \u00b0C), qui pr\u00e9sente un fort effet de mouillage sur l'Al\u2082O\u2083. G\u00e9n\u00e9ralement utilis\u00e9 dans les alliages qui ne sont pas sensibles aux \u00e9l\u00e9ments sodiques, il constitue la base de la plupart des fondants ; le second, quant \u00e0 lui, Flux sans sodium<\/a>, constitue la base des fondants pour alliages d'aluminium \u00e0 forte teneur en Mg. Le m\u00e9lange KCl-MgCl\u2082 pr\u00e9sente un point de fusion bas, compris entre 424 et 465 \u00b0C.<\/p>\n

Afin d'accro\u00eetre l'effet de s\u00e9paration entre les scories et l'aluminium, d'am\u00e9liorer la tension superficielle du flux et d'optimiser son pouvoir purificateur, des additifs tels que le Na\u2083AlF\u2086, le K\u2083AlF\u2086 ou le CaF sont ajout\u00e9s au flux de base. L\u2019ajout de ces additifs se fait g\u00e9n\u00e9ralement soit par m\u00e9lange m\u00e9canique, soit par m\u00e9lange par refusion ; l\u2019uniformit\u00e9 de la composition du flux m\u00e9lang\u00e9 par refusion est bien sup\u00e9rieure \u00e0 celle obtenue par m\u00e9lange m\u00e9canique et permet d\u2019obtenir un eutectique \u00e0 bas point de fusion, mais le co\u00fbt est en cons\u00e9quence plus \u00e9lev\u00e9. Cette m\u00e9thode est utilis\u00e9e pour la pr\u00e9paration de flux haute performance. Le principe fondamental de la m\u00e9thode de m\u00e9lange par refusion consiste \u00e0 ma\u00eetriser les propri\u00e9t\u00e9s thermodynamiques du m\u00e9lange, puis \u00e0 garantir le point de fusion du flux. En r\u00e8gle g\u00e9n\u00e9rale, la temp\u00e9rature de fusion du flux doit \u00eatre inf\u00e9rieure de plus de 50 \u00b0C \u00e0 la temp\u00e9rature de fusion lors de la fusion de l\u2019aluminium. Le flux fondu sert \u00e0 adsorber et \u00e0 faire fondre les impuret\u00e9s. Pour garantir la capacit\u00e9 de scories, si le point de fusion ne r\u00e9pond pas aux exigences, il faut ajouter un agent chauffant afin de favoriser une \u00e9l\u00e9vation rapide de la temp\u00e9rature du flux, ce qui complique la composition des flux pour alliages d\u2019aluminium.<\/p>\n

\"Flux<\/p>\n

La simplification de flux d'affinage pour alliages d'aluminium<\/a> La composition constitue l'une des tendances actuelles en mati\u00e8re de d\u00e9veloppement des flux, et une purification efficace est obtenue gr\u00e2ce \u00e0 des caract\u00e9ristiques physiques et dynamiques des plus simples. Par cons\u00e9quent, pour \u00e9valuer la qualit\u00e9 d'un flux, il convient tout d'abord d'examiner la simplicit\u00e9 de sa composition.<\/p>","protected":false},"excerpt":{"rendered":"

At present, aluminum alloy fluxes are mainly divided into two systems: NaCl-KCl system and KCl-MgCl2 system. The former contains Na and equimolar NaCl-KCl forms a…<\/p>","protected":false},"author":1,"featured_media":6470,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[],"class_list":["post-6445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo"],"yoast_head":"\nAluminum Alloy Fluxes Composition - NaCl-KCl and KCl-MgCl2 System<\/title>\n<meta name=\"description\" content=\"At present, aluminum alloy fluxes are mainly divided into two systems: NaCl-KCl system and KCl-MgCl2 system. The former contains Na.\" \/>\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-alloy-fluxes\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aluminum Alloy Fluxes Composition - NaCl-KCl and KCl-MgCl2 System\" \/>\n<meta property=\"og:description\" content=\"At present, aluminum alloy fluxes are mainly divided into two systems: NaCl-KCl system and KCl-MgCl2 system. 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