{"id":4044,"date":"2020-08-23T08:03:45","date_gmt":"2020-08-23T08:03:45","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4044"},"modified":"2020-08-25T09:05:19","modified_gmt":"2020-08-25T09:05:19","slug":"molten-aluminum-refining-agent","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-aluminum-refining-agent\/","title":{"rendered":"Agent d'affinage de l'aluminium fondu"},"content":{"rendered":"<p>L'agent d'affinage de l'aluminium fondu est un moyen de garantir la qualit\u00e9 du processus de d\u00e9gazage de l'aluminium. Un agent d'affinage de l'aluminium fondu de haute qualit\u00e9 peut r\u00e9agir pour former des bulles \u00e0 environ 660 \u00b0C. Les bulles produites ne sont pas tr\u00e8s violentes, mais elles se forment de mani\u00e8re homog\u00e8ne. Gr\u00e2ce \u00e0 l'adsorption physique, ces bulles sont en contact total avec l'aluminium liquide. Plus la dur\u00e9e est longue, meilleur est le r\u00e9sultat. La dur\u00e9e de moussage est g\u00e9n\u00e9ralement de 6 \u00e0 8 minutes. Lorsque l\u2019alliage d\u2019aluminium est refroidi \u00e0 300 \u00b0C, la solubilit\u00e9 de l\u2019hydrog\u00e8ne dans l\u2019alliage d\u2019aluminium diminue, ne repr\u00e9sentant plus que 1\/700e de celle \u00e0 l\u2019\u00e9tat liquide. Apr\u00e8s solidification, les pores g\u00e9n\u00e9r\u00e9s par la pr\u00e9cipitation de l\u2019hydrog\u00e8ne se pr\u00e9sentent sous la forme de minuscules trous dispers\u00e9s. Cela n\u2019affecte ni le gaz ni la surface usin\u00e9e, et est pratiquement invisible \u00e0 l\u2019\u0153il nu. Lorsque l\u2019aluminium fondu se solidifie, les bulles produites par la pr\u00e9cipitation de l\u2019hydrog\u00e8ne sont relativement grandes et se trouvent principalement au centre de la zone de solidification finale de l\u2019aluminium fondu. Bien qu\u2019elles soient \u00e9galement dispers\u00e9es, ces bulles provoquent g\u00e9n\u00e9ralement des fuites et entra\u00eenent souvent la mise au rebut de la pi\u00e8ce.<\/p>\n<p>Outre l'hydrog\u00e8ne, il est \u00e9galement n\u00e9cessaire d'emp\u00eacher l'humidit\u00e9 et diverses impuret\u00e9s de p\u00e9n\u00e9trer dans le creuset ou le four, et d'\u00e9liminer les inclusions d'oxyde et l'hydrog\u00e8ne pr\u00e9sents dans l'aluminium fondu. Ce n\u2019est qu\u2019en \u00e9liminant efficacement les inclusions dispers\u00e9es en suspension dans l\u2019aluminium fondu qu\u2019il est possible d\u2019emp\u00eacher l\u2019augmentation de la teneur en hydrog\u00e8ne dans l\u2019aluminium fondu et d\u2019\u00e9liminer les obstacles \u00e0 l\u2019\u00e9limination de l\u2019hydrog\u00e8ne, afin d\u2019obtenir un aluminium fondu pur et de r\u00e9aliser des pi\u00e8ces moul\u00e9es conformes aux sp\u00e9cifications. Au cours de la solidification, l\u2019hydrog\u00e8ne pr\u00e9sent dans l\u2019aluminium fondu se dissout partiellement ou totalement dans la structure de l\u2019alliage, ce qui \u00e9vite la formation de trous dans la pi\u00e8ce moul\u00e9e.<\/p>\n<p>Les trous et les bulles \u00e0 la surface peuvent \u00eatre d\u00e9tect\u00e9s par sablage, tandis que ceux situ\u00e9s \u00e0 l'int\u00e9rieur peuvent \u00eatre d\u00e9tect\u00e9s par fluoroscopie aux rayons K ou par usinage. Les trous et les bulles apparaissent en noir sur le film radiographique.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4047\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/08\/Molten-Aluminum-Refining-Agent-2.jpg\" alt=\"Agent d&#039;affinage de l&#039;aluminium fondu\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Molten-Aluminum-Refining-Agent-2.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Molten-Aluminum-Refining-Agent-2-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Lorsque l'alliage d'aluminium se solidifie, cela permet de r\u00e9duire la teneur en gaz de l'eau d'aluminium et d'emp\u00eacher qu'une grande quantit\u00e9 de gaz ne forme des pores \u00e0 la surface de pr\u00e9cipitation de l'alliage d'aluminium. C'est l\u00e0 l'objectif de <a href=\"http:\/\/www.alalloycasting.com\/fr\/aluminum-alloy-refining-process\/\">proc\u00e9d\u00e9 d'affinage de l'aluminium<\/a> dans la fusion des alliages d'aluminium. Si la teneur en gaz de l'aluminium fondu est r\u00e9duite, la quantit\u00e9 de gaz pr\u00e9cipit\u00e9 lors du processus de solidification diminuera, et le nombre de bulles g\u00e9n\u00e9r\u00e9es sera r\u00e9duit, voire consid\u00e9rablement r\u00e9duit. Par cons\u00e9quent, l'affinage des alliages d'aluminium est une technologie tr\u00e8s importante. Si la qualit\u00e9 de l'affinage est bonne, la porosit\u00e9 doit \u00eatre r\u00e9duite ; si la qualit\u00e9 de l'affinage est m\u00e9diocre, la porosit\u00e9 doit \u00eatre augment\u00e9e.<\/p>\n<p>Lors de la fusion d'un alliage d'aluminium, il faut s'efforcer d'obtenir une fusion rapide et de r\u00e9duire le temps de s\u00e9jour \u00e0 haute temp\u00e9rature. La vitesse de remplissage lors du moulage sous pression de l'aluminium fondu est trop \u00e9lev\u00e9e, ce qui emp\u00eache les gaz pr\u00e9sents dans la cavit\u00e9 du moule d'\u00eatre expuls\u00e9s compl\u00e8tement et de mani\u00e8re stable \u00e0 temps ; le flux d'aluminium fondu participe \u00e9galement \u00e0 ce processus. En raison du refroidissement rapide de la surface de l'alliage d'aluminium, celui-ci se retrouve emprisonn\u00e9 dans la coque d'alliage d'aluminium solidifi\u00e9e et ne peut \u00eatre \u00e9vacu\u00e9, formant ainsi un trou important.<\/p>","protected":false},"excerpt":{"rendered":"<p>Molten aluminum refining agent is the measures to ensure the quality of aluminum degassing process. High quality molten aluminum refining agent can react to form&hellip;<\/p>","protected":false},"author":1,"featured_media":4045,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[122,4289,4331,136,4326,4332,644,4503,4327,4324,4323,4325,833,123,4330,4328,4329],"class_list":["post-4044","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-casting-flux","tag-aluminum-degassing-tablets","tag-aluminum-flux","tag-deslagging-agent","tag-dross-reduction","tag-flux-aluminium","tag-molten-aluminum-refining","tag-molten-aluminum-refining-agent","tag-multi-function-refining-flux","tag-refine-agent","tag-refine-flux","tag-refiner","tag-refining-agent","tag-refining-flux","tag-tundish-covering-compound","tag-tundish-covering-powder","tag-tundish-powder"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Molten Aluminum Refining Agent to prevent the formation of holes<\/title>\n<meta name=\"description\" content=\"Molten aluminum refining agent is the measures to ensure the quality of aluminum degassing process. 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