{"id":7032,"date":"2020-12-16T05:42:16","date_gmt":"2020-12-16T05:42:16","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7032"},"modified":"2020-12-16T05:42:16","modified_gmt":"2020-12-16T05:42:16","slug":"molten-metals-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-metals-flux\/","title":{"rendered":"Flux pour m\u00e9taux en fusion"},"content":{"rendered":"

Le flux \u00e9limine les impuret\u00e9s dissoutes et en suspension, notamment les oxydes, les nitrures, les carbures et les carbonates pr\u00e9sents dans les m\u00e9taux en fusion et les \u00e9l\u00e9ments d'alliage. Les impuret\u00e9s dissoutes comprennent les gaz dissous et les solides dissous. Le gaz dissous dans l'aluminium en fusion comprend, par exemple, l'hydrog\u00e8ne, tandis que les particules solides dissoutes comprennent des m\u00e9taux alcalins tels que le sodium et le calcium. Par exemple, lorsque du chlore gazeux est ajout\u00e9, il forme un sel de chlorure qui remonte \u00e0 la surface et est \u00e9limin\u00e9. Les solides en suspension sont transport\u00e9s vers la surface de la masse fondue en se fixant aux bulles qui remontent. L\u2019hydrog\u00e8ne est \u00e9limin\u00e9 par d\u00e9sorption dans les bulles. Il est donc important de maintenir une dispersion fine du gaz de flux ou du sel de flux dans l\u2019ensemble du bain fondu afin de cr\u00e9er de nombreux points de collecte et d\u2019\u00e9limination des impuret\u00e9s dissoutes et en suspension.<\/p>\n

Lorsque le gaz de flux est introduit dans le m\u00e9tal en fusion sous la forme d'une dispersion fine de bulles, cette dispersion fine de bulles s'agglom\u00e8re pour former des bulles plus grosses \u00e0 mesure qu'elles remontent vers la surface. La coalescence de ces grosses bulles r\u00e9duit l\u2019efficacit\u00e9 du flux dans la partie sup\u00e9rieure du bain fondu. \u00c0 volume \u00e9gal de gaz de flux, un grand nombre de grosses bulles offre moins de sites d\u2019\u00e9limination des impuret\u00e9s qu\u2019un grand nombre de bulles finement dispers\u00e9es. Par exemple, comme on peut l\u2019observer dans le bain de fusion, en particulier dans la partie sup\u00e9rieure, la surface des bulles est bien moindre, et l\u2019hydrog\u00e8ne peut \u00eatre absorb\u00e9 par la surface des bulles, ou des solides en suspension peuvent adh\u00e9rer \u00e0 celle-ci pour \u00eatre transport\u00e9s vers la surface. Autrement dit, les grosses bulles offrent moins de sites pour collecter et \u00e9liminer les impuret\u00e9s dissoutes et en suspension. Il est donc souhaitable de redisperser les grosses bulles pour obtenir une dispersion de bulles dans la zone sup\u00e9rieure.<\/p>\n

\"D\u00e9gazage<\/p>\n

Afin de r\u00e9partir le flux de m\u00e9taux en fusion, la roue tourne dans la partie inf\u00e9rieure pour r\u00e9partir ce flux. Lorsque le flux est un gaz, celui-ci peut \u00eatre introduit par le bas depuis le conduit pour \u00eatre \u00e9mis par la fente de la roue. Lorsque le gaz est \u00e9mis par la roue dans le bain fondu, il est g\u00e9n\u00e9ralement r\u00e9parti dans la partie inf\u00e9rieure sous forme de fines bulles par cisaillement.<\/p>\n

Afin de r\u00e9partir le gaz dans le m\u00e9tal situ\u00e9 dans la partie inf\u00e9rieure, la vitesse de rotation doit \u00eatre suffisamment \u00e9lev\u00e9e pour g\u00e9n\u00e9rer une force de cisaillement entre la turbine et le m\u00e9tal en fusion, ce qui permet de produire de fines bulles de gaz de flux. Lorsque la turbine tourne dans la partie inf\u00e9rieure, le gaz de flux est \u00e9mis \u00e0 cet endroit, ce qui d\u00e9pend dans une certaine mesure du fonctionnement du flux de m\u00e9tal fondu<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

The flux removes dissolved and suspended impurities, including oxides, nitrides, carbides, and carbonates of molten metals and alloying elements. Dissolved impurities include dissolved gases and…<\/p>","protected":false},"author":1,"featured_media":7033,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[],"class_list":["post-7032","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo"],"yoast_head":"\nMolten Metals Flux used to Remove Hydrogen and Solid Particles<\/title>\n<meta name=\"description\" content=\"The flux removes dissolved and suspended impurities, including oxides, carbides, and carbonates of molten metals and alloying elements.\" \/>\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-metals-flux\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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