{"id":5346,"date":"2020-09-30T07:42:02","date_gmt":"2020-09-30T07:42:02","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5346"},"modified":"2020-09-30T07:42:02","modified_gmt":"2020-09-30T07:42:02","slug":"aluminium-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminium-degassing\/","title":{"rendered":"D\u00e9gazage de l'aluminium"},"content":{"rendered":"

Le d\u00e9gazage de l'alliage d'aluminium moul\u00e9 sous pression est essentiel pour garantir les propri\u00e9t\u00e9s m\u00e9caniques de la pi\u00e8ce moul\u00e9e. L'absorption d'hydrog\u00e8ne est la principale cause de la formation de porosit\u00e9s capillaires dans les pi\u00e8ces moul\u00e9es en alliage d'aluminium, ainsi que de la diminution de l'\u00e9tanch\u00e9it\u00e9 \u00e0 l'air et des propri\u00e9t\u00e9s m\u00e9caniques. Il est donc n\u00e9cessaire de mettre en \u0153uvre diverses mesures afin de contr\u00f4ler rigoureusement la teneur en hydrog\u00e8ne et en autres gaz.<\/p>\n

Mesures visant \u00e0 contr\u00f4ler la teneur en hydrog\u00e8ne<\/strong><\/p>\n

    \n
  1. Avant d'introduire la charge dans le four, il est indispensable d'\u00e9liminer soigneusement toute trace de rouille et de graisse et de la pr\u00e9chauffer \u00e0 la temp\u00e9rature sp\u00e9cifi\u00e9e.<\/li>\n
  2. Il convient de faire chauffer le four avant d'y introduire la charge afin d'\u00e9liminer l'humidit\u00e9 pr\u00e9sente dans le four et d'emp\u00eacher ainsi que l'humidit\u00e9 et les hydrocarbures n'entrent en contact avec la charge.<\/li>\n
  3. Avant tout contact avec l'alliage d'aluminium en fusion, il convient de le pr\u00e9chauffer compl\u00e8tement afin d'\u00e9liminer l'humidit\u00e9, et la surface des outils en fer doit \u00eatre recouverte d'un agent de rev\u00eatement.<\/li>\n
  4. Contr\u00f4ler la temp\u00e9rature et la dur\u00e9e de fusion, \u00e9viter la surchauffe de la masse fondue d'alliage d'aluminium et la formation de gaz, et utiliser le agent de raffinage<\/a> pour l'affinage de la masse fondue d'alliage d'aluminium. L'agent d'affinage doit \u00eatre enti\u00e8rement s\u00e9ch\u00e9 avant utilisation.<\/li>\n
  5. L'hydrog\u00e8ne contenu dans l'aluminium fondu est pr\u00e9cipit\u00e9 en injectant un gaz inerte dans l'aluminium fondu se trouvant dans le r\u00e9cipient de transfert, afin de r\u00e9duire la teneur en hydrog\u00e8ne de l'alliage d'aluminium fondu.<\/li>\n<\/ol>\n

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

    Le proc\u00e9d\u00e9 au gaz consiste \u00e0 acheminer l'aluminium fondu contenu dans le conteneur de transfert vers le unit\u00e9 de d\u00e9gazage de l'aluminium<\/a>, et en injectant un gaz inerte dans l'aluminium fondu par les orifices d'a\u00e9ration du rotor en graphite afin de pr\u00e9cipiter l'hydrog\u00e8ne, ce qui permet de r\u00e9duire la teneur en hydrog\u00e8ne du bain de fusion. Dans le cadre d\u2019une op\u00e9ration de fusion normale, le processus de d\u00e9gazage par transfert est optimis\u00e9 et am\u00e9lior\u00e9, et diff\u00e9rents types de gaz inertes sont utilis\u00e9s pour alimenter le bain d\u2019alliage d\u2019aluminium en cours de transfert, de sorte que l\u2019hydrog\u00e8ne contenu dans ce bain puisse \u00eatre efficacement pr\u00e9cipit\u00e9, ce qui permet de r\u00e9duire la densit\u00e9 de l\u2019alliage d\u2019aluminium fondu.<\/p>\n

    Nous avons choisi deux types de gaz inertes : l'azote et l'argon, m\u00e9lang\u00e9s dans diff\u00e9rentes proportions, puis d\u00e9gaz\u00e9s pendant le transport. Les donn\u00e9es exp\u00e9rimentales montrent que si l'on utilise une proportion plus \u00e9lev\u00e9e d'argon pour le d\u00e9gazage par transfert, sa densit\u00e9 diminue consid\u00e9rablement, mais le co\u00fbt de production li\u00e9 au d\u00e9gazage augmente de plus de 25%. Apr\u00e8s une discussion approfondie et la prise en compte de facteurs tels que la ma\u00eetrise des co\u00fbts de production, l\u2019\u00e9quipe de recherche a finalement d\u00e9cid\u00e9 d\u2019utiliser l\u2019azote.<\/p>","protected":false},"excerpt":{"rendered":"

    The aluminium degassing of die-casting aluminum alloy is very important to the mechanical properties of the casting. The hydrogen absorption is the main reason for…<\/p>","protected":false},"author":1,"featured_media":5347,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5346","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminium Degassing with Nitrogen | Degassing Unit<\/title>\n<meta name=\"description\" content=\"The aluminium degassing with nitrogen of die-casting aluminum alloy is very important to the mechanical properties of the casting.\" \/>\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\/aluminium-degassing\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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