{"id":10612,"date":"2021-10-14T09:07:06","date_gmt":"2021-10-14T09:07:06","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10612"},"modified":"2021-10-14T09:07:06","modified_gmt":"2021-10-14T09:07:06","slug":"furnace-refining-with-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/furnace-refining-with-flux\/","title":{"rendered":"Affinage au four avec fondant"},"content":{"rendered":"<p>L'affinage en four avec fondant est largement utilis\u00e9 dans les fonderies d'aluminium. L'objectif principal des techniques de purification de la masse fondue d'aluminium est d'am\u00e9liorer en permanence la puret\u00e9 de celle-ci, de rechercher sans rel\u00e2che des techniques de purification \u00e0 haut rendement et \u00e0 faible co\u00fbt, et de r\u00e9pondre aux besoins li\u00e9s au d\u00e9veloppement des techniques de purification de la masse fondue dans la transformation de l'aluminium.<\/p>\n<p>Les inclusions pr\u00e9sentes dans les masses fondues d'aluminium et d'alliages d'aluminium sont principalement constitu\u00e9es d'oxydes d'aluminium. La nocivit\u00e9 des inclusions pour l'aluminium et les alliages d'aluminium ne r\u00e9side pas uniquement dans leurs effets n\u00e9fastes sur les propri\u00e9t\u00e9s du mat\u00e9riau. En outre, la teneur en inclusions a une certaine influence sur la teneur en hydrog\u00e8ne de la masse fondue, et celles-ci constituent un bon vecteur d'hydrog\u00e8ne dans la masse fondue. Par cons\u00e9quent, la teneur en inclusions influe \u00e9galement sur le niveau de porosit\u00e9 ou de piq\u00fbres dans la pi\u00e8ce moul\u00e9e.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10614\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/10\/Flux-for-Aluminum-Foundry-1.jpg\" alt=\"\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/10\/Flux-for-Aluminum-Foundry-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/10\/Flux-for-Aluminum-Foundry-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>L'ajout d'une certaine quantit\u00e9 de fondant dans les masses fondues d'aluminium et d'alliages d'aluminium permet de r\u00e9duire efficacement la teneur en inclusions de la masse fondue. L'affinage en four avec du fondant joue principalement un r\u00f4le dans le processus d'\u00e9limination des impuret\u00e9s de la masse fondue, et ce sous deux aspects :<\/p>\n<p>(1) La solubilit\u00e9 \u00e0 l'\u00e9tat solide du fondant dans l'aluminium et les alliages d'aluminium est faible. Au cours de la solidification de la masse fondue, le fondant s\u2019accumule aux limites des grains ou \u00e0 l\u2019interface solide-liquide, et les inclusions d\u2019oxyde s\u2019accumulent \u00e9galement aux limites des grains pendant le processus de solidification, ce qui cr\u00e9e des conditions favorables \u00e0 une r\u00e9action de contact entre le fondant et les inclusions d\u2019Al\u2082O\u2083. L\u2019aluminium contenu dans les inclusions est r\u00e9duit en aluminium \u00e9l\u00e9mentaire et r\u00e9introduit dans la masse fondue. Le produit de la r\u00e9action entre le fondant et l\u2019alumine est un oxyde \u00e0 point de fusion \u00e9lev\u00e9, dont la densit\u00e9 est sup\u00e9rieure \u00e0 celle de l\u2019aluminium fondu. Il peut donc s\u2019enfoncer au fond du creuset pour \u00eatre \u00e9limin\u00e9 par d\u00e9cantation, ce qui permet d\u2019atteindre l\u2019objectif d\u2019\u00e9limination des impuret\u00e9s.<\/p>\n<p>(2) Le flux est un agent tensioactif. Lorsque le flux est utilis\u00e9 comme agent tensioactif, <a href=\"http:\/\/www.alalloycasting.com\/fr\/covering-agent\/\">agent de recouvrement<\/a>, un oxyde complexe issu du fondant se forme \u00e0 la surface de la masse fondue, ce qui rend le film d'oxyde superficiel plus dense et emp\u00eache davantage l'oxydation de la masse fondue.<\/p>","protected":false},"excerpt":{"rendered":"<p>Furnace refining with flux is widely used in aluminum foundry. The main goal of aluminum melt purification technology is to continuously improve the purity of&hellip;<\/p>","protected":false},"author":1,"featured_media":10613,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10612","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>Furnace Refining with Flux used in Aluminum Foundry<\/title>\n<meta name=\"description\" content=\"Furnace refining with flux is widely used in aluminum foundry. 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