{"id":6566,"date":"2020-11-19T09:26:02","date_gmt":"2020-11-19T09:26:02","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6566"},"modified":"2020-11-19T09:26:02","modified_gmt":"2020-11-19T09:26:02","slug":"molten-aluminum-refining-treatments","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-aluminum-refining-treatments\/","title":{"rendered":"Traitements d'affinage de l'aluminium fondu"},"content":{"rendered":"

L'alliage d'aluminium fondu doit subir des traitements d'affinage avant la coul\u00e9e afin de :<\/p>\n

D\u00e9gazage : L'aluminium fondu contient une grande quantit\u00e9 d'hydrog\u00e8ne. Si celui-ci n'est pas \u00e9limin\u00e9, des piq\u00fbres et des pores appara\u00eetront dans la pi\u00e8ce moul\u00e9e.
\nGrains affin\u00e9s : Am\u00e9liorent les propri\u00e9t\u00e9s m\u00e9caniques des pi\u00e8ces moul\u00e9es en contr\u00f4lant la taille des grains apr\u00e8s solidification.
\nM\u00e9tamorphisme : modifier la structure du silicium en y ajoutant une petite quantit\u00e9 d'\u00e9l\u00e9ments m\u00e9tamorphiques, afin d'am\u00e9liorer les performances de la pi\u00e8ce moul\u00e9e.<\/p>\n

Il existe diff\u00e9rentes m\u00e9thodes pour ces m\u00e9taux en fusion affinage de l'aluminium<\/a> traitements. La m\u00e9thode traditionnelle consiste \u00e0 ajouter successivement divers fondants au m\u00e9tal en fusion dans le sac de transfert ou le four de maintien afin de le traiter. Ces derni\u00e8res ann\u00e9es, la \u201c station de traitement des m\u00e9taux \u201d a \u00e9t\u00e9 mise au point avec succ\u00e8s et est d\u00e9sormais largement utilis\u00e9e. Tous les traitements d\u2019affinage de l\u2019aluminium en fusion peuvent ainsi \u00eatre r\u00e9alis\u00e9s de mani\u00e8re plus efficace en une seule op\u00e9ration.<\/p>\n

\u00c0 mesure que la temp\u00e9rature de fusion augmente, la solubilit\u00e9 de l'hydrog\u00e8ne dans l'aluminium fondu augmente progressivement. Cependant, la solubilit\u00e9 de l'hydrog\u00e8ne dans l'aluminium solide est tr\u00e8s faible ; ainsi, lorsque l'alliage d'aluminium se solidifie, l'hydrog\u00e8ne pr\u00e9cipit\u00e9 s'agglom\u00e8re et forme des piq\u00fbres et des pores dans la pi\u00e8ce moul\u00e9e.<\/p>\n

Afin de r\u00e9duire l'inhalation d'hydrog\u00e8ne, les mat\u00e9riaux r\u00e9fractaires, les creusets et les outils doivent \u00eatre soigneusement pr\u00e9chauff\u00e9s, et les d\u00e9chets huileux issus de la r\u00e9cup\u00e9ration doivent \u00eatre d\u00e9shydrat\u00e9s. La flamme du br\u00fbleur doit \u00eatre l\u00e9g\u00e8rement oxydante afin d\u2019\u00e9viter une teneur excessive en hydrog\u00e8ne dans les produits de combustion. La temp\u00e9rature du m\u00e9tal en fusion doit \u00eatre maintenue aussi basse que possible, car une temp\u00e9rature \u00e9lev\u00e9e dissout davantage d\u2019hydrog\u00e8ne. Bien entendu, quelle que soit la prudence dont on fait preuve, il restera toujours de l\u2019hydrog\u00e8ne.<\/p>\n

\"Traitements<\/p>\n

Le nombre de pores admissibles dans une pi\u00e8ce moul\u00e9e d\u00e9pend du proc\u00e9d\u00e9 de moulage et de l'utilisation finale de la pi\u00e8ce. Si le m\u00e9tal refroidit lentement, comme dans un moule en sable, les gaz de refroidissement se concentrent en petites bulles et restent dans la pi\u00e8ce moul\u00e9e. Ces bulles sont mises en \u00e9vidence lors des \u00e9tapes ult\u00e9rieures de d\u00e9coupe ou de grenaillage, et les d\u00e9fauts poreux ressemblant \u00e0 des \u201c trous d'\u00e9pingle \u201d pr\u00e9sents sur la surface trait\u00e9e entra\u00eenent une perte importante des propri\u00e9t\u00e9s m\u00e9caniques et de l'\u00e9tanch\u00e9it\u00e9 \u00e0 l'air.<\/p>\n

Dans les proc\u00e9d\u00e9s de moulage pr\u00e9sentant des vitesses de solidification relativement \u00e9lev\u00e9es, tels que le moulage en moule m\u00e9tallique et le moulage \u00e0 basse pression, les pores form\u00e9s sont g\u00e9n\u00e9ralement petits et assez dispers\u00e9s. Par cons\u00e9quent, ils ont peu d'incidence sur les propri\u00e9t\u00e9s m\u00e9caniques et ont m\u00eame un certain effet positif dans la production r\u00e9elle : ils peuvent compenser le retrait local des pi\u00e8ces moul\u00e9es. Pour le moulage en moule m\u00e9tallique \u00e0 haute densit\u00e9 et le moulage \u00e0 basse pression, il reste toutefois n\u00e9cessaire d'adopter un proc\u00e9d\u00e9 de d\u00e9gazage efficace.<\/p>\n

Autrefois, lors de la fabrication de pi\u00e8ces moul\u00e9es sous pression, il n\u2019\u00e9tait g\u00e9n\u00e9ralement pas n\u00e9cessaire de d\u00e9gazer le m\u00e9tal en fusion. Les pores qu\u2019il contient sont le plus souvent dus \u00e0 l\u2019introduction d\u2019air lors du processus de moulage par injection hydraulique du m\u00e9tal. La porosit\u00e9 caus\u00e9e par l\u2019hydrog\u00e8ne n\u2019est g\u00e9n\u00e9ralement pas grave. Cela s'explique notamment par le fait que le moulage sous pression utilise g\u00e9n\u00e9ralement une temp\u00e9rature de coul\u00e9e plus basse et que le m\u00e9tal en fusion lui-m\u00eame pr\u00e9sente une teneur en hydrog\u00e8ne plus faible. Cependant, ces derni\u00e8res ann\u00e9es, avec l'am\u00e9lioration des techniques de moulage sous pression et le renforcement des exigences en mati\u00e8re de qualit\u00e9 des pi\u00e8ces moul\u00e9es, de plus en plus d'usines de moulage sous pression proc\u00e8dent \u00e0 un d\u00e9gazage du m\u00e9tal en fusion avant le moulage.<\/p>","protected":false},"excerpt":{"rendered":"

The molten aluminum alloy must undergo refining treatments before casting to: Degassing: The molten aluminum contains a large amount of hydrogen. If it is not…<\/p>","protected":false},"author":1,"featured_media":6591,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6566","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nMolten Aluminum Refining Treatments by Degassing<\/title>\n<meta name=\"description\" content=\"The molten aluminum must undergo refining treatments: degassing, refined grains, metamorphism, thereby improving the casting performance.\" \/>\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-aluminum-refining-treatments\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Molten Aluminum 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