{"id":7064,"date":"2020-12-17T08:17:21","date_gmt":"2020-12-17T08:17:21","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7064"},"modified":"2020-12-17T08:17:21","modified_gmt":"2020-12-17T08:17:21","slug":"molten-aluminium-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-aluminium-degassing\/","title":{"rendered":"D\u00e9gazage de l'aluminium fondu"},"content":{"rendered":"<p>Le m\u00e9tal en fusion contient une forte proportion de r\u00e9sidus d'oxydes et\/ou de nitrures, ce qui a un effet n\u00e9gatif sur la solidification de certains alliages. L'\u00e9tat fondu ou liqu\u00e9fi\u00e9 de l'aluminium favorise \u00e9galement la formation et l'absorption d'hydrog\u00e8ne dans l'aluminium fondu. L'hydrog\u00e8ne se pr\u00e9cipite sous forme de pores lors de la solidification de l'alliage d'aluminium, ce qui nuit aux propri\u00e9t\u00e9s m\u00e9caniques de l'alliage solide. Le d\u00e9gazage de l'aluminium fondu est une m\u00e9thode efficace pour r\u00e9duire la porosit\u00e9 caus\u00e9e par l'hydrog\u00e8ne.<\/p>\n<p>L'une des m\u00e9thodes de d\u00e9gazage de l'aluminium fondu consiste \u00e0 introduire dans la masse d'aluminium fondu un m\u00e9lange compos\u00e9 d'un gaz inerte (tel que l'argon ou l'azote) et d'un gaz r\u00e9actif (tel que le chlore) afin de capter l'hydrog\u00e8ne et les impuret\u00e9s solides en suspension. Le m\u00e9lange gazeux remonte \u00e0 la surface en entra\u00eenant avec lui l'hydrog\u00e8ne et les impuret\u00e9s sous forme d'oxydes.<\/p>\n<p>L'aluminium en fusion peut \u00e9galement n\u00e9cessiter un d\u00e9gazage au flux. <a href=\"http:\/\/www.alalloycasting.com\/fr\/flux-degassing\/\">D\u00e9gazage par flux<\/a> Il s'agit d'un proc\u00e9d\u00e9 consistant \u00e0 introduire des m\u00e9langes de sels sous forme de poudre ou de granul\u00e9s, tels que du chlorure et\/ou du fluorure, dans l'aluminium fondu \u00e0 l'aide d'un gaz vecteur tel que l'azote ou l'argon. Le flux de sel peut \u00eatre introduit \u00e0 l'aide d'un \u00e9quipement de d\u00e9gazage rotatif. Un dispositif rotatif exemplaire comprend un arbre creux central fix\u00e9 \u00e0 un rotor qui est ins\u00e9r\u00e9 dans le bain d\u2019aluminium fondu et mis en rotation de mani\u00e8re \u00e0 ce que le flux de sel se d\u00e9place le long de l\u2019arbre creux et soit dispers\u00e9 dans l\u2019aluminium fondu par des orifices pratiqu\u00e9s dans le rotor.<\/p>\n<p>Il reste n\u00e9cessaire de mettre au point un dispositif et un proc\u00e9d\u00e9 permettant de g\u00e9rer de mani\u00e8re efficace et s\u00fbre l'injection d'une quantit\u00e9 pr\u00e9d\u00e9termin\u00e9e de flux de d\u00e9gazage dans le m\u00e9tal en fusion.<\/p>\n<p>Le dispositif d'injection de flux comprend un r\u00e9servoir sous pression adapt\u00e9 pour stocker et fournir du flux sous pression. Un m\u00e9canisme d'alimentation destin\u00e9 \u00e0 d\u00e9verser une quantit\u00e9 pr\u00e9d\u00e9termin\u00e9e de flux vers la sortie du r\u00e9servoir sous pression, ainsi qu'un contr\u00f4leur destin\u00e9 \u00e0 surveiller et \u00e0 faire fonctionner l'\u00e9quipement. Le m\u00e9canisme d'alimentation comprend un bo\u00eetier dot\u00e9 d'une paroi interne qui d\u00e9finit une cavit\u00e9 comportant une entr\u00e9e et une sortie. La roue d'alimentation est positionn\u00e9e dans la cavit\u00e9 et est con\u00e7ue pour recevoir une quantit\u00e9 pr\u00e9d\u00e9termin\u00e9e de flux par l'entr\u00e9e, faire circuler le flux dans la cavit\u00e9 et d\u00e9verser ladite quantit\u00e9 pr\u00e9d\u00e9termin\u00e9e de flux par la sortie du r\u00e9servoir sous pression.<\/p>","protected":false},"excerpt":{"rendered":"<p>Molten metal includes a high content of oxide and\/or nitride debris, which has a negative effect on the solidification of certain alloys. The molten or&hellip;<\/p>","protected":false},"author":1,"featured_media":7065,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7064","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Molten Aluminium Degassing Flux -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Molten aluminium degassing is an effective method to reduce the porosity caused by hydrogen. 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