{"id":4472,"date":"2020-09-03T09:37:10","date_gmt":"2020-09-03T09:37:10","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4472"},"modified":"2020-09-03T09:37:10","modified_gmt":"2020-09-03T09:37:10","slug":"rotary-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/rotary-degassing\/","title":{"rendered":"D\u00e9gazage rotatif"},"content":{"rendered":"<p>Le d\u00e9gazage rotatif est l'une des m\u00e9thodes de d\u00e9gazage les plus efficaces, qui utilise un gaz inerte (l'azote). La r\u00e9duction de la teneur en hydrog\u00e8ne de l'aluminium fondu avant la coul\u00e9e constitue l'un des aspects les plus importants du contr\u00f4le qualit\u00e9 en fonderie. Le processus d'\u00e9limination de l'hydrog\u00e8ne est appel\u00e9 \u00ab d\u00e9gazage \u00bb.<\/p>\n<p>Il est bien connu que l'aluminium fondu et les alliages d'aluminium absorbent de grandes quantit\u00e9s de gaz, et que la quantit\u00e9 pr\u00e9sente dans une coul\u00e9e donn\u00e9e d\u00e9pend des caract\u00e9ristiques du m\u00e9tal utilis\u00e9, de la composition de l'alliage et des conditions de fusion. La pr\u00e9sence de gaz dans le m\u00e9tal se traduit par l'apparition de soufflures, de ce qu'on appelle des piq\u00fbres et de rubans ou de bulles \u00e0 la surface des pi\u00e8ces forg\u00e9es. Si le produit fini est utilis\u00e9 comme r\u00e9cipient pour des liquides ou des gaz, ces cavit\u00e9s, en particulier les piq\u00fbres, peuvent entra\u00eener des fuites de gaz ou de liquide.<\/p>\n<p>\u00c0 l'\u00e9tat fondu, l'aluminium et ses alliages peuvent absorber des gaz, mais lorsque le m\u00e9tal liquide refroidit et se solidifie dans le moule, l'absorption de gaz diminue et les gaz libres sont lib\u00e9r\u00e9s. Le gaz lib\u00e9r\u00e9 s'accumule imm\u00e9diatement et forme des bulles, dont certaines restent pi\u00e9g\u00e9es dans les blocs solidifi\u00e9s, ce qui entra\u00eene l'apparition de cavit\u00e9s ou de discontinuit\u00e9s dans la structure m\u00e9tallique, \u00e0 l'origine de la fragilit\u00e9 des pi\u00e8ces moul\u00e9es.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4473\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotary-Degassing-1.jpg\" alt=\"D\u00e9gazage rotatif\" width=\"400\" height=\"500\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotary-Degassing-1.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotary-Degassing-1-240x300.jpg 240w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>Le magazine en ligne AdTech <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-unit\/\">unit\u00e9 de d\u00e9gazage<\/a> utilise un proc\u00e9d\u00e9 de d\u00e9gazage sous gaz inerte. Le d\u00e9gazage de l'aluminium repose sur les principes suivants :<\/p>\n<p>L'hydrog\u00e8ne dissous se d\u00e9place d'une zone de forte concentration vers une zone de faible concentration. L'hydrog\u00e8ne se disperse dans le m\u00e9tal en fusion \u00e0 mesure qu'il est lib\u00e9r\u00e9 dans tout espace confin\u00e9. Il maintient une concentration constante dans l'ensemble de la masse fondue. La vitesse de migration de l'hydrog\u00e8ne dans l'aluminium fondu est presque aussi rapide que celle dans l'air. Il n'est donc pas n\u00e9cessaire de mettre le m\u00e9tal en contact avec des gaz inertes \u00e0 chaque once. L'efficacit\u00e9 du d\u00e9gazage de l'aluminium d\u00e9pend de deux facteurs : la vitesse de transport \u00e0 l'interface m\u00e9tal\/gaz et la surface totale sur laquelle le transport peut s'effectuer.<\/p>\n<p>Le principe du d\u00e9gazage rotatif consiste \u00e0 augmenter la surface de contact entre le gaz d'injection et le m\u00e9tal. Une surface de contact plus importante augmente le taux de transfert du m\u00e9tal vers le gaz inerte. Pour un volume de gaz donn\u00e9, plus la taille des bulles est petite, plus la surface de contact est grande.<\/p>\n<p>Par exemple, une bulle d'un diam\u00e8tre de 1 pouce a une surface de 6 pouces carr\u00e9s. Si cette m\u00eame bulle est divis\u00e9e en bulles d'un diam\u00e8tre de 1\/16 de pouce, sa surface passera \u00e0 96 pouces carr\u00e9s.<\/p>\n<p>En d'autres termes, si l'on utilise le m\u00eame volume de gaz et que l'on r\u00e9duit le diam\u00e8tre de la bulle \u00e0 1\/16e de son diam\u00e8tre initial, la surface totale sera multipli\u00e9e par 16. Les bulles plus petites perturbent moins la surface de la masse fondue et limitent l'absorption suppl\u00e9mentaire d'hydrog\u00e8ne dans un environnement humide.<\/p>","protected":false},"excerpt":{"rendered":"<p>Rotary degassing is one of the most effective degassing methods by using inert gas (nitrogen). Reducing hydrogen content in molten aluminum before casting is one&hellip;<\/p>","protected":false},"author":1,"featured_media":4474,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4294,396,4287,4288,397,4293,4290,154,4291,4289,4292,4284,4285,1485,4286,4295,4299,4297,4298,4296,4300,1706],"class_list":["post-4472","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-degass","tag-aluminium-degassing","tag-aluminium-degassing-flux","tag-aluminium-degassing-nitrogen","tag-aluminium-degassing-process","tag-aluminum-degassing-equipment","tag-aluminum-degassing-flux","tag-aluminum-degassing-process","tag-aluminum-degassing-system","tag-aluminum-degassing-tablets","tag-aluminum-degassing-units","tag-degassing-aluminum-alloys","tag-degassing-aluminum-with-argon","tag-degassing-equipment","tag-degassing-equipment-supplier","tag-degassing-machine","tag-degassing-machine-buy","tag-degassing-machine-coimbatore","tag-degassing-machine-parts","tag-degassing-machine-pune","tag-nitrogen-degassing-machine","tag-rotary-degassing-machine"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rotary Degassing Unit for Reducing Hydrogen Content<\/title>\n<meta name=\"description\" content=\"Rotary degassing is one effective degassing method by using inert gas. 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