{"id":7308,"date":"2020-12-30T07:53:50","date_gmt":"2020-12-30T07:53:50","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7308"},"modified":"2020-12-31T08:53:05","modified_gmt":"2020-12-31T08:53:05","slug":"degassing-aluminum-melt","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-aluminum-melt\/","title":{"rendered":"D\u00e9gazage de l'aluminium fondu"},"content":{"rendered":"<p>Les techniques de d\u00e9gazage et d'injection de flux peuvent contribuer \u00e0 r\u00e9duire la teneur en hydrog\u00e8ne et les inclusions, et \u00e0 am\u00e9liorer la qualit\u00e9 de la masse d'aluminium fondu en fonderie.<\/p>\n<p>La porosit\u00e9 est un d\u00e9faut courant et bien connu des pi\u00e8ces moul\u00e9es. Sa pr\u00e9sence nuit \u00e0 leurs propri\u00e9t\u00e9s m\u00e9caniques et \u00e0 leur r\u00e9sistance \u00e0 la corrosion. Elle constitue donc l'une des principales causes de rebut dans les fonderies. Celles-ci classent g\u00e9n\u00e9ralement la porosit\u00e9 en deux cat\u00e9gories : les pores et les d\u00e9fauts de retrait ; mais en r\u00e9alit\u00e9, la porosit\u00e9 r\u00e9sulte souvent d'une combinaison des deux.<\/p>\n<p>Cependant, ces deux ph\u00e9nom\u00e8nes peuvent se produire s\u00e9par\u00e9ment, et lorsque c'est le cas, leur ma\u00eetrise et leur correction s'av\u00e8rent plus faciles et plus simples pour l'ing\u00e9nieur en fonderie.<\/p>\n<p>La principale source de pores dans les pi\u00e8ces moul\u00e9es en aluminium est l'hydrog\u00e8ne, qui est le seul gaz pr\u00e9sentant une solubilit\u00e9 significative dans l'aluminium fondu. Les pi\u00e8ces moul\u00e9es en aluminium contiennent g\u00e9n\u00e9ralement entre 0,15 et 0,30 ml d'H\u2082 pour 100 mg d'Al. Ce n'est que dans le cas des alliages de moulage \u00e0 haute r\u00e9sistance que la concentration en hydrog\u00e8ne doit \u00eatre maintenue en dessous de 0,1 ml d'H\u2082 pour 100 mg d'Al.<\/p>\n<p>Bien que les pi\u00e8ces moul\u00e9es pr\u00e9sentant une tr\u00e8s faible teneur en hydrog\u00e8ne aient g\u00e9n\u00e9ralement une porosit\u00e9 de retrait plus importante que celles dont la concentration est plus \u00e9lev\u00e9e, elles n\u00e9cessitent des calculs plus pr\u00e9cis concernant le syst\u00e8me d\u2019alimentation et les canaux de coul\u00e9e. La quantit\u00e9 admissible de pores dans la pi\u00e8ce moul\u00e9e est d\u00e9termin\u00e9e par le proc\u00e9d\u00e9 de moulage et les sp\u00e9cifications des pi\u00e8ces. Dans le cas des pi\u00e8ces moul\u00e9es \u00e0 haute r\u00e9sistance, telles que celles utilis\u00e9es dans l\u2019a\u00e9rospatiale ou l\u2019automobile, des sp\u00e9cifications tr\u00e8s strictes en mati\u00e8re de robustesse et de propri\u00e9t\u00e9s m\u00e9caniques sont toujours \u00e9tablies ; il est donc n\u00e9cessaire de recourir \u00e0 des m\u00e9thodes de d\u00e9gazage de la masse d\u2019aluminium tr\u00e8s pr\u00e9cises et efficaces afin de maintenir la concentration en hydrog\u00e8ne la plus faible possible.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7291\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/12\/Degassing-for-Foundry.jpg\" alt=\"D\u00e9gazage pour la fonderie\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Degassing-for-Foundry.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Degassing-for-Foundry-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Le proc\u00e9d\u00e9 de d\u00e9gazage de la fonte d'aluminium vise principalement \u00e0 r\u00e9duire la concentration d'hydrog\u00e8ne dissous dans le m\u00e9tal en fusion, avant la coul\u00e9e. La m\u00e9thode la plus efficace pour le d\u00e9gazage consiste \u00e0 faire tourner une turbine. Le gaz de purge inject\u00e9 est fragment\u00e9 en petites bulles et r\u00e9parti uniform\u00e9ment dans l'ensemble du bain de fusion.<\/p>\n<p>Les gaz de purge les plus couramment utilis\u00e9s dans <a href=\"http:\/\/www.alalloycasting.com\/fr\/rotary-degassing\/\">d\u00e9gazage rotatif<\/a> sont l'azote et l'argon. \u00c0 mesure que la bulle de purge remonte, l'hydrog\u00e8ne dissous se diffuse dans celle-ci pour former de l'hydrog\u00e8ne mol\u00e9culaire, qui est insoluble et est donc lib\u00e9r\u00e9 lorsque la bulle atteint la surface. Par cons\u00e9quent, la surface de contact entre le m\u00e9tal liquide et les bulles, ainsi que le temps de s\u00e9jour des bulles dans le m\u00e9tal liquide, jouent un r\u00f4le important dans l'efficacit\u00e9 du d\u00e9gazage.<\/p>\n<p>Les bulles plus petites sont pr\u00e9f\u00e9rables car elles pr\u00e9sentent une plus grande surface et remontent lentement. Le taux d'\u00e9limination de l'hydrog\u00e8ne dans le proc\u00e9d\u00e9 de d\u00e9gazage par rotation est r\u00e9gi par les principes de la thermodynamique et de la cin\u00e9tique, ainsi que par la conception du rotor, le facteur de fusion, les param\u00e8tres de fonctionnement et les conditions physiques du <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-equipment\/\">\u00e9quipement de d\u00e9gazage<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Degassing and flux injection practices can help reduce hydrogen and inclusions and improve the quality of the aluminum melt in the foundry. Porosity is a&hellip;<\/p>","protected":false},"author":1,"featured_media":7309,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4366,4363,4320,4316,4311,231,4319,1485,4310,4312,4314,4315,4317,4322,1767,4365,4313,4321,4318,4362,4364],"class_list":["post-7308","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-and-nitrogen","tag-aluminium-flux-powder","tag-aluminium-hydrogen","tag-aluminum-porosity","tag-deaerator-price","tag-define-degassing","tag-degasser-meaning","tag-degassing-equipment","tag-degassing-meaning","tag-degassing-of-aluminum","tag-die-casting-aluminum-radiator","tag-graphite-rotor","tag-how-degasser-works","tag-how-does-a-degasser-work","tag-hydrogen-degassing","tag-hydrogen-melting","tag-metal-degassing","tag-pouring-temperature-of-aluminum","tag-reduced-pressure-test-aluminum","tag-stay-clean-aluminum-flux","tag-what-is-flux-melting"],"yoast_head":"<!-- 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