{"id":6608,"date":"2020-11-20T06:18:43","date_gmt":"2020-11-20T06:18:43","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6608"},"modified":"2022-02-22T08:52:39","modified_gmt":"2022-02-22T08:52:39","slug":"fluxes-for-aluminum-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/fluxes-for-aluminum-casting\/","title":{"rendered":"Flux pour la coul\u00e9e d'aluminium"},"content":{"rendered":"

Les fondants destin\u00e9s \u00e0 la coul\u00e9e de l'aluminium sont largement utilis\u00e9s dans la production d'aluminium primaire et secondaire afin d'am\u00e9liorer la qualit\u00e9 de la masse fondue et le taux de r\u00e9cup\u00e9ration de l'aluminium m\u00e9tallique.<\/p>\n

Les fondants utilis\u00e9s pour la coul\u00e9e de l'aluminium remplissent quatre fonctions :<\/p>\n

Tout d'abord, flux pour la coul\u00e9e d'aluminium<\/a> modifie la mouillabilit\u00e9 de l'aluminium fondu par rapport \u00e0 l'oxyde (alumine), de sorte que l'aluminium fondu se s\u00e9pare facilement de l'oxyde (alumine), ce qui permet \u00e0 la majeure partie de l'oxyde (alumine) d'\u00eatre absorb\u00e9e par le fondant et de r\u00e9duire ainsi la teneur en oxydes du bain de fusion.<\/p>\n

D'autre part, le flux peut modifier l'\u00e9tat du film d'oxyde \u00e0 la surface de la masse fondue. En effet, il peut fragmenter le film d'oxyde solide et dense qui recouvre la surface de la masse fondue en fines particules, ce qui favorise la fuite de l'hydrog\u00e8ne contenu dans la masse fondue \u00e0 travers les interstices du film d'oxyde vers l'atmosph\u00e8re.<\/p>\n

Troisi\u00e8mement, la pr\u00e9sence de la couche de flux permet d'isoler le contact entre la vapeur d'eau pr\u00e9sente dans l'atmosph\u00e8re et le bain d'aluminium en fusion, ce qui emp\u00eache l'hydrog\u00e8ne de p\u00e9n\u00e9trer dans ce dernier et, dans le m\u00eame temps, \u00e9vite que le bain ne s'oxyde et ne s'enflamme.<\/p>\n

Quatri\u00e8mement, le fondant peut absorber les oxydes pr\u00e9sents dans la masse d'aluminium en fusion, ce qui permet de purifier celle-ci. En r\u00e9sum\u00e9, le r\u00f4le de l'affinage par fondant dans l'\u00e9limination des inclusions repose principalement sur l'adsorption, la dissolution et l'interaction chimique avec les films d'oxyde et les inclusions non m\u00e9talliques pr\u00e9sents dans la masse en fusion.<\/p>\n

\"Flux<\/p>\n

Il existe de nombreux types de fondants utilis\u00e9s dans la fusion des alliages d'aluminium, qui peuvent \u00eatre class\u00e9s en deux cat\u00e9gories : agent de recouvrement<\/a> et agent de raffinage<\/a>. Tout flux utilis\u00e9 dans le processus de fusion des alliages d'aluminium doit r\u00e9pondre aux conditions suivantes.<\/p>\n

    \n
  1. Le point de fusion doit \u00eatre inf\u00e9rieur \u00e0 la temp\u00e9rature de fusion de l'alliage d'aluminium.<\/li>\n
  2. La densit\u00e9 doit \u00eatre inf\u00e9rieure \u00e0 celle de l'alliage d'aluminium.<\/li>\n
  3. Il permet d'absorber et de dissoudre les inclusions pr\u00e9sentes dans la masse fondue, et d'en \u00e9liminer les gaz.<\/li>\n
  4. Il ne doit pas entrer en r\u00e9action chimique avec le m\u00e9tal ni avec le rev\u00eatement du four. S'il entre en r\u00e9action avec le m\u00e9tal, il ne doit produire qu'un gaz inerte insoluble dans le m\u00e9tal, et le fondant doit \u00eatre insoluble dans le m\u00e9tal en fusion.<\/li>\n
  5. L'absorption d'humidit\u00e9 doit \u00eatre faible et la pression d'\u00e9vaporation doit \u00eatre basse.<\/li>\n
  6. Il ne doit pas contenir ni d\u00e9gager d'impuret\u00e9s ni de gaz nocifs.<\/li>\n
  7. Il doit pr\u00e9senter une viscosit\u00e9 et une fluidit\u00e9 ad\u00e9quates.<\/li>\n
  8. Facile \u00e0 fabriquer : bon march\u00e9.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"

    Fluxes for aluminum casting are widely used in the production of primary aluminum and secondary aluminum to improve the quality of the melt and the…<\/p>","protected":false},"author":1,"featured_media":6610,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[],"class_list":["post-6608","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo"],"yoast_head":"\nFluxes for Aluminum Casting -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Fluxes for aluminum casting are widely used in the production of primary aluminum and secondary aluminum to improve the quality of the melt.\" \/>\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\/fluxes-for-aluminum-casting\/\" \/>\n<meta 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