{"id":10539,"date":"2021-10-12T08:13:40","date_gmt":"2021-10-12T08:13:40","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10539"},"modified":"2021-10-12T08:13:40","modified_gmt":"2021-10-12T08:13:40","slug":"wall-cleaning-fluxes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/wall-cleaning-fluxes\/","title":{"rendered":"Flux de nettoyage pour murs"},"content":{"rendered":"

Les flux de nettoyage des parois permettent d'\u00e9viter l'accumulation d'oxydes sur les parois des creusets et des fours, tant au-dessus qu'en dessous de la ligne de fusion. Cela permet de r\u00e9duire \u00e0 la fois le gaspillage d'alliage et une autre source d'inclusions ind\u00e9sirables.<\/p>\n

Les flux de nettoyage des parois ramollissent les oxydes accumul\u00e9s sur les parois du four. Ils contiennent des fluorures doubles (Na\u2082SiF\u2086, Na\u2082AlF\u2086) et un agent oxydant. L'agent oxydant r\u00e9agit avec l'aluminium en d\u00e9gageant de la chaleur, ce qui favorise la p\u00e9n\u00e9tration des fluorures dans les oxydes accumul\u00e9s et les ramollit. Les oxydes ramollis peuvent alors \u00eatre facilement racl\u00e9s de la paroi par l'op\u00e9rateur du four.<\/p>\n

Les flux de nettoyage \u00e9liminent les oxydes en suspension dans la masse d'aluminium fondu. \u00c0 l'instar du Flux de d\u00e9capage<\/a>, le flux de nettoyage est compos\u00e9 d'un m\u00e9lange de chlorures, de fluorures et d'un agent oxydant. Les flux de nettoyage g\u00e9n\u00e8rent moins de chaleur ; leur effet de s\u00e9paration de l'aluminium est donc moindre. En revanche, ils poss\u00e8dent une meilleure capacit\u00e9 \u00e0 absorber les inclusions d'oxydes pr\u00e9sentes dans la masse fondue.<\/p>\n

La pratique courante pour l'introduction du fondent consiste \u00e0 l'appliquer manuellement. La plupart des fondants sont d\u00e9pos\u00e9s \u00e0 la surface de la masse fondue, puis m\u00e9lang\u00e9s \u00e0 celle-ci. Certains fondants (d\u00e9gazants, affineurs de grain) sont plong\u00e9s jusqu'au fond \u00e0 l'aide d'une cloche perfor\u00e9e propre et pr\u00e9chauff\u00e9e.<\/p>\n

\"\"<\/p>\n

Les fondants peuvent \u00e9galement \u00eatre introduits dans la masse fondue par injection, sous forme de poudre entra\u00een\u00e9e par un flux de gaz inerte (argon ou azote). La technique d'injection de fondant la plus simple consiste \u00e0 plonger une lance dans la masse fondue. La m\u00e9thode la plus efficace pour introduire le fondant est l'injection par d\u00e9gazeur rotatif.<\/p>\n

Faites passer de l'azote (pression comprise entre 1,2 et 1,8 kg\/cm\u00b2) puis ouvrez le robinet situ\u00e9 sous le r\u00e9servoir de raffinage. Le gaz utilis\u00e9 est de l'azote de haute puret\u00e9 \u00e0 99,991 TP3T. Pendant l'affinage, il est pr\u00e9f\u00e9rable que la pression de l'azote soit suffisante pour expulser la poudre. La quantit\u00e9 d'agent d'affinage est d'environ 0,15 \u00e0 0,201 TP3T.<\/p>\n

La temp\u00e9rature d'affinage est maintenue entre environ 730 et 750 degr\u00e9s Celsius, et les scories peuvent \u00eatre racl\u00e9es apr\u00e8s un temps de repos de 20 minutes suivant l'affinage. Veillez \u00e0 ne pas remuer l'aluminium en fusion lors du raclage des scories, afin d'\u00e9viter que celles-ci ne soient entra\u00een\u00e9es dans l'aluminium en fusion, puis utilisez un agent de recouvrement pour recouvrir la surface et emp\u00eacher le m\u00e9tal en fusion de se r\u00e9oxyder et d'absorber les impuret\u00e9s.<\/p>","protected":false},"excerpt":{"rendered":"

Wall cleaning fluxes help keep crucible and furnace walls above and below the melt line free of oxide build-up. This reduces both alloy wastage and…<\/p>","protected":false},"author":1,"featured_media":10540,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10539","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"\nWall Cleaning Fluxes for Aluminum Melting -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Wall cleaning fluxes help keep crucible and furnace walls free of oxide build-up. 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