{"id":2040,"date":"2020-05-26T06:52:54","date_gmt":"2020-05-26T06:52:54","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2040"},"modified":"2020-09-03T04:02:00","modified_gmt":"2020-09-03T04:02:00","slug":"aluminium-alloy-refining-process","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminium-alloy-refining-process\/","title":{"rendered":"Proc\u00e9d\u00e9 d'affinage des alliages d'aluminium"},"content":{"rendered":"

Le proc\u00e9d\u00e9 d'affinage des alliages d'aluminium par syst\u00e8me de d\u00e9gazage rotatif permet d'\u00e9liminer l'hydrog\u00e8ne et les scories, de purifier l'aluminium et d'\u00e9liminer les microperforations. Avec le d\u00e9veloppement rapide de l'industrie automobile, la production de pi\u00e8ces moul\u00e9es en alliage d'aluminium conna\u00eet une croissance fulgurante. La quantit\u00e9 importante de d\u00e9chets de moulage r\u00e9sultant d\u2019un traitement inad\u00e9quat des masses fondues d\u2019alliages d\u2019aluminium constitue un probl\u00e8me que les fabricants de pi\u00e8ces moul\u00e9es en alliage d\u2019aluminium doivent r\u00e9soudre de toute urgence. Ces derni\u00e8res ann\u00e9es, la recherche sur les proc\u00e9d\u00e9s d\u2019affinage des alliages d\u2019aluminium a suscit\u00e9 l\u2019int\u00e9r\u00eat des professionnels du moulage. De nombreux facteurs influent sur la qualit\u00e9 des masses fondues d\u2019alliages d\u2019aluminium, notamment la composition chimique de l\u2019alliage, l\u2019\u00e9tat de fusion, l\u2019affinage de l\u2019alliage et sa modification.<\/p>\n

Les pores de coul\u00e9e pr\u00e9sents dans les pi\u00e8ces moul\u00e9es en alliage d'aluminium constituent la principale cause de rebut. La pr\u00e9sence de porosit\u00e9s ne r\u00e9duit pas seulement la surface utile de la pi\u00e8ce moul\u00e9e, mais constitue \u00e9galement une source de fissures et acc\u00e9l\u00e8re leur propagation. Elle entra\u00eene \u00e0 terme une d\u00e9gradation des propri\u00e9t\u00e9s m\u00e9caniques du mat\u00e9riau. La formation de porosit\u00e9s est principalement due \u00e0 la pr\u00e9sence d\u2019inclusions de scories et \u00e0 la teneur en hydrog\u00e8ne dans la masse fondue. L\u2019hydrog\u00e8ne repr\u00e9sente environ 85% du gaz total pr\u00e9sent dans la masse fondue d\u2019aluminium. En effet, la solubilit\u00e9 de l\u2019hydrog\u00e8ne dans l\u2019aluminium solide est d\u2019environ 1\/20 de celle \u00e0 l\u2019\u00e9tat liquide. Lorsque l\u2019aluminium se solidifie, l\u2019hydrog\u00e8ne qui y est dissous pr\u00e9cipite pour former des porosit\u00e9s. Le processus d\u2019affinage des alliages d\u2019aluminium par rotation syst\u00e8me de d\u00e9gazage<\/a>\u00a0permet d'\u00e9liminer l'hydrog\u00e8ne et les scories, de purifier l'aluminium en fusion et d'\u00e9liminer les microperforations des pi\u00e8ces moul\u00e9es.<\/p>\n

Proc\u00e9d\u00e9 d'affinage des alliages d'aluminium<\/h2>\n

Le principe de fonctionnement est le suivant : lorsque le moteur entra\u00eene le rotor en rotation, l'argon se fragmente en petites bulles. La pr\u00e9sence de ces petites bulles r\u00e9duit la concentration d\u2019hydrog\u00e8ne dans l\u2019aluminium en fusion ainsi que la pression partielle \u00e0 sa surface, ce qui diminue la concentration d\u2019hydrog\u00e8ne dans l\u2019aluminium en fusion. L\u2019hydrog\u00e8ne est extrait de la surface de l\u2019aluminium en fusion par l\u2019argon, puis br\u00fbl\u00e9 et consomm\u00e9 \u00e0 la surface du bain d\u2019aluminium.<\/p>\n

Lorsque de petites bulles d'argon remontent vers la surface du liquide au fond du bain d'aluminium fondu, l'hydrog\u00e8ne dissous dans ce dernier entre en contact avec l'interface entre l'argon et l'aluminium fondu, et passe alors de l'\u00e9tat dissous \u00e0 l'\u00e9tat adsorb\u00e9. Les atomes de gaz pr\u00e9sents dans la couche d'adsorption r\u00e9agissent pour former des mol\u00e9cules d'hydrog\u00e8ne. \u00c0 mesure que les bulles grossissent, elles remontent \u00e0 la surface de l'aluminium fondu et se consument.<\/p>\n

\"Proc\u00e9d\u00e9<\/h2>\n

Lorsque de petites bulles d'argon remontent du fond de la masse d'aluminium en fusion vers la surface, les particules d'inclusions en suspension dans cette masse sont remu\u00e9es ; les inclusions entrent alors en collision les unes avec les autres, s'agglom\u00e8rent et grossissent. Lorsque l\u2019inclusion atteint une certaine taille, elle peut entrer en collision avec les bulles flottantes et y \u00eatre pi\u00e9g\u00e9e. Elle est alors amen\u00e9e \u00e0 la surface du liquide, ce qui permet d\u2019\u00e9liminer les scories.<\/p>\n

Il existe deux mod\u00e8les d'inclusions pi\u00e9geant les bulles, qui entra\u00eenent une capture par collision inertielle pour les inclusions de plus grande taille. Pour les inclusions plus petites, il est difficile qu'elles entrent en collision avec les bulles, mais un pi\u00e9geage tangentiel peut se produire autour de celles-ci.<\/p>\n

En effet, l'argon \u00e9tant un gaz inerte, il ne r\u00e9agit pas avec l'aluminium liquide. Il peut remplacer l'hydrog\u00e8ne dans la masse d'aluminium fondu, ce qui r\u00e9duit consid\u00e9rablement la teneur en hydrog\u00e8ne de celle-ci et am\u00e9liore les propri\u00e9t\u00e9s m\u00e9caniques de l'alliage d'aluminium.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminium alloy refining process by rotating degassing system can remove hydrogen and slag, purify the aluminum, and eliminate the pinholes. With the rapid development of…<\/p>","protected":false},"author":1,"featured_media":4287,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[234,1734,4499,231,1762,1756,1765,116,1777,106,1466,4640,324,4369,4347,1707,835,1767,4367,4513,4641,1771,117,31,4301,92,4371,642,1467,834,1980,1769,1706,4370,1773,1772,235],"class_list":["post-2040","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-alloy-refining-process","tag-aluminum-melt-degassing-and-refining","tag-aluminum-refining-degassing","tag-define-degassing","tag-degassing-aluminum-casting","tag-degassing-and-refining","tag-degassing-in-aluminum-casting","tag-degassing-in-casting","tag-degassing-molten-aluminium","tag-degassing-process","tag-degassing-process-in-aluminum-casting","tag-degassing-refining","tag-degassing-system","tag-degassing-unit-for-sale","tag-degassing-with-nitrogen","tag-dual-rotor-online-degassing-unit","tag-flux-degassing","tag-hydrogen-degassing","tag-main-components-of-degassing-device","tag-melting-degassing","tag-metal-degassing-system","tag-methods-of-degassing-in-foundry","tag-molten-aluminum-degasser","tag-molten-aluminum-refining-degassing","tag-nitrogen-degassing-aluminum","tag-online-degassing-device","tag-online-degassing-of-aluminum","tag-online-degassing-system","tag-refining-and-degassing-in-aluminum-alloy","tag-rotary-degasser","tag-rotary-degassing-aluminum","tag-rotary-degassing-equipment","tag-rotary-degassing-machine","tag-rotary-degassing-machine-manufacturer","tag-rotary-degassing-method","tag-rotary-degassing-unit","tag-rotating-degassing-system"],"yoast_head":"\nAluminium 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