{"id":7134,"date":"2020-12-21T09:30:47","date_gmt":"2020-12-21T09:30:47","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7134"},"modified":"2020-12-21T09:30:47","modified_gmt":"2020-12-21T09:30:47","slug":"degassing-of-molten-metal","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-of-molten-metal\/","title":{"rendered":"D\u00e9gazage du m\u00e9tal en fusion"},"content":{"rendered":"<p>Le traitement de d\u00e9gazage est une m\u00e9thode permettant d'\u00e9liminer les impuret\u00e9s gazeuses du m\u00e9tal en fusion. Ce proc\u00e9d\u00e9 physique consiste \u00e0 injecter un gaz de flux dans la masse en fusion. L'hydrog\u00e8ne p\u00e9n\u00e8tre dans la bulle de purge en se diffusant \u00e0 travers la masse en fusion jusqu'\u00e0 la bulle, o\u00f9 il adh\u00e8re \u00e0 la surface de celle-ci et est absorb\u00e9 par la bulle elle-m\u00eame. L'hydrog\u00e8ne est ensuite \u00e9vacu\u00e9 du bain de fusion sous forme de bulles.<\/p>\n<p>Le m\u00e9tal en fusion, et plus particuli\u00e8rement l'aluminium en fusion dans la pratique, contient g\u00e9n\u00e9ralement des impuret\u00e9s gazeuses et solides entra\u00een\u00e9es ou dissoutes qui nuisent au produit moul\u00e9 final. Ces impuret\u00e9s peuvent affecter le produit moul\u00e9 final une fois que le m\u00e9tal en fusion s'est solidifi\u00e9, ce qui peut entraver son usinage ou entra\u00eener une faible ductilit\u00e9 du produit final, ainsi que des propri\u00e9t\u00e9s de finition et d'anodisation m\u00e9diocres.<\/p>\n<p>Il existe bien s\u00fbr un besoin important d\u2019am\u00e9liorer le d\u00e9gazage du m\u00e9tal en fusion afin d\u2019\u00e9liminer ou de r\u00e9duire au minimum ces impuret\u00e9s dans le produit moul\u00e9 final, en particulier dans l\u2019aluminium, surtout lorsque le m\u00e9tal obtenu est utilis\u00e9 dans des produits d\u00e9coratifs. Il s'agit notamment des moulures d\u00e9coratives ou des produits soumis \u00e0 des sp\u00e9cifications strictes, tels que les pi\u00e8ces forg\u00e9es et extrud\u00e9es pour l'a\u00e9ronautique, ainsi que les mati\u00e8res premi\u00e8res pour feuilles l\u00e9g\u00e8res. Les impuret\u00e9s susmentionn\u00e9es entra\u00eenent une perte des propri\u00e9t\u00e9s du produit moul\u00e9 final, telles que la r\u00e9sistance \u00e0 la traction et la r\u00e9sistance \u00e0 la corrosion.<\/p>\n<p>Des proc\u00e9d\u00e9s rigoureux de traitement des m\u00e9taux (tels que le flux gazeux ou la filtration en fusion) ont permis de r\u00e9duire au minimum la fr\u00e9quence de ces d\u00e9fauts. Cependant, bien que ces traitements aient g\u00e9n\u00e9ralement permis de ramener la fr\u00e9quence de ces d\u00e9fauts \u00e0 un niveau satisfaisant, ils se sont r\u00e9v\u00e9l\u00e9s inefficaces ou peu rentables.<\/p>\n<p>Les proc\u00e9d\u00e9s conventionnels de fusion au gaz, tels que la fusion en sole classique, consistent \u00e0 introduire le gaz de fusion dans un four de maintien contenant une certaine quantit\u00e9 de m\u00e9tal en fusion. Ce proc\u00e9d\u00e9 n\u00e9cessite que le m\u00e9tal en fusion reste dans le four pendant une dur\u00e9e consid\u00e9rable lors du passage du gaz de flux, afin que le m\u00e9tal \u00e0 traiter reste stable et puisse \u00eatre trait\u00e9.<\/p>\n<p>Ce proc\u00e9d\u00e9 pr\u00e9sente de nombreux inconv\u00e9nients, parmi lesquels une efficacit\u00e9 r\u00e9duite et un co\u00fbt accru dus \u00e0 la dur\u00e9e prolong\u00e9e d\u2019inactivit\u00e9 du four pendant l\u2019op\u00e9ration de fusion et, surtout, le manque d\u2019efficacit\u00e9 du processus de fluxage en raison d\u2019une mauvaise couverture du flux fondu et de la formation de bulles m\u00e9talliques plus volumineuses. De plus, la dispersibilit\u00e9 des bulles dans la masse fondue est m\u00e9diocre. D'autres facteurs entrent \u00e9galement en ligne de compte, notamment la limitation de l'emplacement du four, qui permet aux impuret\u00e9s de r\u00e9int\u00e9grer la masse fondue avant la coul\u00e9e, ainsi que les \u00e9missions \u00e9lev\u00e9es dues \u00e0 la grande quantit\u00e9 de gaz de flux n\u00e9cessaire et \u00e0 l'emplacement de sa circulation.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7036\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/12\/Online-Degassing-Molten-Metal.jpg\" alt=\"D\u00e9gazage en ligne du m\u00e9tal en fusion\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Online-Degassing-Molten-Metal.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Online-Degassing-Molten-Metal-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Il existe une m\u00e9thode efficace <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-device\/\">dispositif de d\u00e9gazage<\/a> capable de rem\u00e9dier aux inconv\u00e9nients susmentionn\u00e9s. Le dispositif comprend une chambre dot\u00e9e d\u2019entr\u00e9es et de sorties de m\u00e9tal distinctes, de parois lat\u00e9rales et de plaques de fond. La chambre est divis\u00e9e en deux parties par un d\u00e9flecteur. Le m\u00e9tal en fusion s\u2019\u00e9coule depuis l\u2019entr\u00e9e de la chambre, sous le d\u00e9flecteur, vers la premi\u00e8re partie de la chambre, puis vers la deuxi\u00e8me partie de la chambre, avant de sortir par la sortie correspondante. Une plaque de pulv\u00e9risation d\u2019eau est pr\u00e9vue au fond de la chambre de combustion afin d\u2019introduire le gaz de flux dans le m\u00e9tal en fusion. Le m\u00e9tal traverse la premi\u00e8re partie de la chambre avant de passer sous la cloison de s\u00e9paration pour rejoindre la deuxi\u00e8me partie de la chambre.<\/p>\n<p>Dans le cadre du processus de mise en \u0153uvre, la plaque de distribution est con\u00e7ue pour maximiser la surface et la dispersion des bulles d\u00e9gaz\u00e9es afin d\u2019adsorber les impuret\u00e9s gazeuses. La plaque de distribution comporte une pluralit\u00e9 de trous destin\u00e9s \u00e0 introduire le gaz de flux dans le m\u00e9tal en fusion. La taille des trous et la distance moyenne entre ceux-ci doivent \u00eatre contr\u00f4l\u00e9es de mani\u00e8re \u00e0 minimiser la distance de diffusion des impuret\u00e9s gazeuses tout en \u00e9tant suffisamment grandes pour emp\u00eacher la coalescence des bulles.<\/p>\n<p>Le d\u00e9gazage du m\u00e9tal en fusion s'effectue en faisant passer celui-ci \u00e0 travers la chambre, dans laquelle il entre en contact \u00e0 contre-courant avec le gaz de flux, tandis que dans la premi\u00e8re partie de la chambre, le gaz de flux est achemin\u00e9 par un distributeur situ\u00e9 dans cette premi\u00e8re partie de la chambre. Le m\u00e9tal \u00e9ject\u00e9 de la plaque s'\u00e9coule et entre en contact avec le m\u00e9tal en fusion dans la premi\u00e8re partie de la chambre.<\/p>","protected":false},"excerpt":{"rendered":"<p>Degassing treatment is one method of removing gaseous impurities from molten metal. The physical process involves injecting flux gas into the melt. Hydrogen enters the&hellip;<\/p>","protected":false},"author":1,"featured_media":7138,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7134","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>Degassing of Molten Metal with Rotary Degassing Device<\/title>\n<meta name=\"description\" content=\"Degassing of molten metal can remove impurities in the final cast product, especially when the resulting metal used in decorative products.\" \/>\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\/degassing-of-molten-metal\/\" \/>\n<meta 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