{"id":5636,"date":"2020-10-16T02:45:51","date_gmt":"2020-10-16T02:45:51","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5636"},"modified":"2020-10-16T02:45:51","modified_gmt":"2020-10-16T02:45:51","slug":"degassing-principle","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-principle\/","title":{"rendered":"Principe de d\u00e9gazage"},"content":{"rendered":"

Le principe de d\u00e9gazage varie selon les unit\u00e9s de d\u00e9gazage. \u00c0 l'heure actuelle, les deux gaz inertes couramment utilis\u00e9s dans le processus de d\u00e9gazage sont l'azote et l'argon. L'azote est un gaz inerte pur qui ne r\u00e9agit pas avec les oxydes. De plus, l'azote est facile \u00e0 produire en grande s\u00e9rie et son prix repr\u00e9sente un quart de celui de l'argon pour un volume \u00e9quivalent, ce qui le rend \u00e9conomique. C'est \u00e9galement un gaz de soufflage fr\u00e9quemment utilis\u00e9, qui donne de bons r\u00e9sultats.<\/p>\n

Le principe de d\u00e9gazage du syst\u00e8me en ligne unit\u00e9 de d\u00e9gazage<\/a> consiste \u00e0 insuffler du gaz inerte ordinaire (N\u2082) dans l'aluminium fondu \u00e0 travers un rotor en graphite en rotation, afin de fragmenter les grosses bulles d'azote en tr\u00e8s petites bulles et de les disperser dans le m\u00e9tal fondu. En r\u00e9duisant le diam\u00e8tre des bulles, la surface sp\u00e9cifique du gaz purifi\u00e9 augmente consid\u00e9rablement, ce qui permet \u00e0 une plus grande surface de ces bulles d\u2019entrer en contact avec l\u2019hydrog\u00e8ne et les impuret\u00e9s pr\u00e9sents dans le m\u00e9tal en fusion. \u00c0 la surface de contact entre la bulle et le m\u00e9tal, en raison de la diff\u00e9rence de pression entre la pression d\u2019hydrog\u00e8ne \u00e0 l\u2019int\u00e9rieur du m\u00e9tal liquide et celle de la bulle d\u2019azote dans le m\u00e9tal, l\u2019hydrog\u00e8ne se diffuse dans la bulle selon la loi de la pression partielle. Le taux de diffusion est tr\u00e8s rapide au d\u00e9but, puis ralentit progressivement \u00e0 mesure que la pression d\u2019hydrog\u00e8ne dans la bulle se rapproche de celle du m\u00e9tal en fusion. Lorsque les bulles d\u2019azote remontent \u00e0 la surface du m\u00e9tal en fusion, l\u2019hydrog\u00e8ne est \u00e9vacu\u00e9 vers l\u2019atmosph\u00e8re. La surface de contact et le temps d\u2019action entre l\u2019azote et le m\u00e9tal en fusion sont des facteurs importants qui influencent l\u2019efficacit\u00e9 du d\u00e9gazage. Par cons\u00e9quent, afin d\u2019obtenir un bon d\u00e9gazage, il est n\u00e9cessaire de rendre les bulles d\u2019azote fines et uniformes en faisant tourner le rotor.<\/p>\n

\"Principe<\/p>\n

D'un point de vue op\u00e9rationnel, une tige de transmission rotative est reli\u00e9e \u00e0 un raccord rotatif afin de g\u00e9n\u00e9rer le mouvement de rotation de la tige et du rotor. Le raccord rotatif fournit \u00e9galement du gaz de flux ; la tige de transmission et la pi\u00e8ce en graphite sont pourvues d'un al\u00e9sage central qui permet au gaz purifi\u00e9 de passer et d'\u00eatre pulv\u00e9ris\u00e9 dans le m\u00e9tal liquide. Le d\u00e9bit du gaz r\u00e9actif peut \u00eatre contr\u00f4l\u00e9, et son volume peut \u00eatre ajust\u00e9 en fonction du volume du m\u00e9tal liquide trait\u00e9. La vitesse de la tige rotative et du rotor peut \u00eatre r\u00e9gl\u00e9e afin de g\u00e9n\u00e9rer des bulles de taille appropri\u00e9e et de favoriser la diffusion des gaz r\u00e9actifs.<\/p>","protected":false},"excerpt":{"rendered":"

The degassing principle is different for different degassing unit. At present, the two inert gases commonly used in the degassing process are nitrogen and argon.…<\/p>","protected":false},"author":1,"featured_media":5648,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5636","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nDegassing Principle of Aluminum Online Degassing Unit<\/title>\n<meta name=\"description\" content=\"The degassing principle of the online degassing unit is to blow the ordinary inert gas into the molten aluminum through the rotating rotor.\" \/>\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-principle\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" 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