{"id":12333,"date":"2022-01-19T03:07:59","date_gmt":"2022-01-19T03:07:59","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=12333"},"modified":"2022-01-19T03:07:59","modified_gmt":"2022-01-19T03:07:59","slug":"degassing-of-molten-aluminium","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-of-molten-aluminium\/","title":{"rendered":"D\u00e9gazage de l'aluminium fondu"},"content":{"rendered":"

Le d\u00e9gazage de l'aluminium fondu a une incidence directe sur la qualit\u00e9 des pi\u00e8ces moul\u00e9es en aluminium. Afin de r\u00e9duire au minimum la teneur en hydrog\u00e8ne de l'aluminium fondu, il est n\u00e9cessaire de mettre en place une m\u00e9thode de d\u00e9gazage permettant d'\u00e9liminer plus efficacement l'hydrog\u00e8ne pr\u00e9sent dans l'aluminium fondu.<\/p>\n

Compte tenu des probl\u00e8mes susmentionn\u00e9s, AdTech propose en ligne syst\u00e8mes de d\u00e9gazage de l'aluminium<\/a> qui permettent un d\u00e9gazage plus efficace et am\u00e9liorent la qualit\u00e9 du produit. Un gaz inerte est inject\u00e9 dans l'aluminium fondu contenu dans la poche de coul\u00e9e, puis transf\u00e9r\u00e9 dans le rotor ; celui-ci tourne alors dans l'aluminium fondu \u00e0 une vitesse comprise entre 400 et 500 tr\/min. Les syst\u00e8mes de d\u00e9gazage de l'aluminium \u00e9liminent l'hydrog\u00e8ne et les inclusions de l'aluminium fondu.<\/p>\n

Les syst\u00e8mes de d\u00e9gazage sont con\u00e7us pour le d\u00e9gazage en continu de l'aluminium fondu pr\u00e9sentant des d\u00e9bits \u00e9lev\u00e9s, une forte teneur en gaz et un taux d'inclusions important. Ils sont \u00e9quip\u00e9s de deux rotors d'agitation contr\u00f4lables ind\u00e9pendamment qui tournent en sens inverse afin d'assurer un brassage plus puissant. Le volume d'air est important, l'\u00e9quipement est directement plac\u00e9 sur la goulotte, la grue horizontale peut \u00eatre lev\u00e9e ou les pi\u00e8ces d'usure peuvent \u00eatre remplac\u00e9es, et la conception dot\u00e9e d'une bonne isolation thermique permet un d\u00e9gazage en ligne ininterrompu 24 heures sur 24.<\/p>\n

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

Le principe du syst\u00e8me de d\u00e9gazage en continu de l'aluminium repose sur la solubilit\u00e9 de l'hydrog\u00e8ne dans l'aluminium et sur la pression partielle de l'hydrog\u00e8ne dans la masse d'aluminium fondu. Lorsque la pression partielle d'hydrog\u00e8ne correspondant \u00e0 la teneur en hydrog\u00e8ne du bain d'aluminium en fusion est sup\u00e9rieure \u00e0 la pression partielle d'hydrog\u00e8ne du gaz en contact avec ce bain, l'hydrog\u00e8ne pr\u00e9sent dans le bain d'aluminium en fusion se diffuse dans la phase gazeuse, ce qui permet d'\u00e9liminer l'hydrog\u00e8ne.<\/p>\n

Par cons\u00e9quent, afin d'\u00e9liminer autant d'hydrog\u00e8ne que possible de la masse d'aluminium en fusion en utilisant le moins de gaz inerte possible, il convient de respecter les principes suivants pour l'\u00e9limination en continu de l'hydrog\u00e8ne par gaz inerte :<\/p>\n

Plus la teneur en hydrog\u00e8ne et en oxyg\u00e8ne du gaz inerte est faible, mieux c'est.
\nPlus le nombre de bulles form\u00e9es par l'injection d'un gaz inerte dans la masse fondue est \u00e9lev\u00e9, plus les bulles sont petites et meilleure est la dispersibilit\u00e9.
\nPlus les bulles restent longtemps dans la masse d'aluminium en fusion, mieux c'est.<\/p>","protected":false},"excerpt":{"rendered":"

Degassing of Molten Aluminium directly affects the quality of aluminum castings. In order to minimize the hydrogen in the molten aluminum, it is necessary to…<\/p>","protected":false},"author":1,"featured_media":12334,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[13171,642],"class_list":["post-12333","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-degassing-unit","tag-degassing-of-molten-aluminium","tag-online-degassing-system"],"yoast_head":"\nDegassing of Molten Aluminium, Online Degassing System<\/title>\n<meta name=\"description\" content=\"Degassing of Molten Aluminium directly affects the quality of aluminum castings. 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