{"id":2914,"date":"2020-07-18T03:57:11","date_gmt":"2020-07-18T03:57:11","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2914"},"modified":"2020-10-19T05:57:43","modified_gmt":"2020-10-19T05:57:43","slug":"aluminum-alloy-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-alloy-refining\/","title":{"rendered":"Affinage des alliages d'aluminium"},"content":{"rendered":"

La pratique de la production d'alliages d'aluminium a d\u00e9montr\u00e9 que l'hydrog\u00e8ne est le seul gaz pouvant se dissoudre en grande quantit\u00e9 dans l'aluminium ou les alliages d'aluminium, et qu'il s'agit du gaz le plus soluble dans les alliages d'aluminium. L'affinage des alliages d'aluminium constitue donc une \u00e9tape importante. Lors de la fusion d\u2019un alliage d\u2019aluminium, l\u2019agent d\u2019affinage doit \u00eatre ajout\u00e9 en proportion ad\u00e9quate. La quantit\u00e9 d\u2019agent d\u2019affinage est g\u00e9n\u00e9ralement de 0,31 TP3T par rapport \u00e0 l\u2019alliage d\u2019aluminium. Le temps de d\u00e9gazage n\u2019est pas suffisant. On utilise un tube en acier sans soudure. L\u2019agent de nettoyage est pulv\u00e9ris\u00e9 \u00e0 l\u2019azote ou \u00e0 l\u2019argon \u00e0 20 cm sous la surface du bain d\u2019aluminium fondu. Apr\u00e8s le lavage et la pulv\u00e9risation, on injecte de l\u2019azote ou de l\u2019argon pendant encore 15 \u00e0 20 minutes. Apr\u00e8s le lavage, on laisse reposer pendant 10 \u00e0 15 minutes, on retire les scories d\u2019aluminium, puis on coule avec un filtre en mousse c\u00e9ramique<\/a>.<\/p>\n

\"Affinage<\/p>\n

Divers m\u00e9taux non ferreux destin\u00e9s \u00e0 la fonderie ont la particularit\u00e9 d\u2019absorber les gaz. Au cours du processus de fusion ou de maintien \u00e0 temp\u00e9rature, la solubilit\u00e9 des gaz absorb\u00e9s par le bain d\u2019alliage augmente rapidement \u00e0 mesure que la temp\u00e9rature de celui-ci s\u2019\u00e9l\u00e8ve. Par cons\u00e9quent, outre un contr\u00f4le rigoureux de l'ensemble du processus de fusion et de coul\u00e9e, la temp\u00e9rature du bain d'alliage doit \u00eatre maintenue aussi basse que possible afin d'\u00e9viter sa surchauffe. Pour les alliages pr\u00e9sentant une forte capacit\u00e9 d'absorption, il convient de recourir \u00e0 une fusion sous protection d'un agent de recouvrement. C'est la seule fa\u00e7on d'\u00e9viter la formation de pores d'air et de micro-pores.<\/p>\n

Afin de r\u00e9duire l'oxydation de l'alliage d'aluminium, outre le choix d'un four de fusion adapt\u00e9, il convient d'utiliser un four de maintien pour conserver la chaleur lors de la production par moulage sous pression. \u00c9vitez les op\u00e9rations de fusion et de moulage sous pression, r\u00e9duisez autant que possible l'agitation, pr\u00e9servez l'int\u00e9grit\u00e9 du film d'oxyde liquide, \u00e9vitez toute surchauffe inutile de l'alliage liquide et r\u00e9duisez autant que possible la dur\u00e9e de s\u00e9jour de l'alliage dans le four de maintien.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum alloy production practice has proved that hydrogen is the only gas that can be dissolved in a large amount in aluminum or aluminum alloy,…<\/p>","protected":false},"author":1,"featured_media":5755,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[1470],"class_list":["post-2914","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-aluminum-alloy-refining"],"yoast_head":"\nAluminum Alloy Refining,Refining Agent-sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"After aluminum alloy refining, it is sedated for 10-15 minutes, the aluminum slag is stripped off, and poured with a ceramic foam filter.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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