flux de raffinage<\/a>. En effet, une fois que la bulle de gaz inerte a fait remonter les inclusions \u00e0 la surface du liquide, s\u2019il y a une couche de flux \u00e0 la surface du liquide, les inclusions vont p\u00e9n\u00e9trer dans le flux et se transformer en scories fondues, faciles \u00e0 retirer. Dans le cas contraire, les inclusions de densit\u00e9 sup\u00e9rieure retomberont dans l\u2019aluminium fondu, tandis que celles de densit\u00e9 inf\u00e9rieure formeront une \u00e9cume \u00e0 la surface de l\u2019aluminium fondu, difficile \u00e0 s\u00e9parer de ce dernier. L\u2019adsorption se produisant \u00e0 l\u2019interface entre la bulle et le bain de fusion, seule une partie limit\u00e9e du bain peut \u00eatre mise en contact, ce qui restreint l\u2019efficacit\u00e9 de l\u2019\u00e9limination des scories.<\/p>\nPlus le nombre de bulles produites est \u00e9lev\u00e9, plus leur rayon est petit, plus leur r\u00e9partition est homog\u00e8ne et plus la dur\u00e9e de soufflage est longue, plus l'efficacit\u00e9 de l'\u00e9limination des scories est grande.<\/p>\n
Ce proc\u00e9d\u00e9 repose sur le principe du d\u00e9gazage par diff\u00e9rence de pression partielle. Comme la bulle de gaz inject\u00e9e dans la masse fondue ne contient pas d'hydrog\u00e8ne, sa pression partielle d'hydrog\u00e8ne est nulle, tandis que celle de la masse fondue \u00e0 proximit\u00e9 de la bulle est nettement sup\u00e9rieure \u00e0 z\u00e9ro. Il existe donc une diff\u00e9rence de pression partielle d\u2019hydrog\u00e8ne \u00e0 l\u2019int\u00e9rieur et \u00e0 l\u2019ext\u00e9rieur de la bulle, ce qui fait que l\u2019hydrog\u00e8ne dissous dans le m\u00e9tal se diffuse en continu dans la bulle, et que l\u2019hydrog\u00e8ne entrant dans la bulle s\u2019\u00e9chappe dans l\u2019atmosph\u00e8re lorsque celle-ci remonte. De plus, les microbulles d\u2019hydrog\u00e8ne en suspension dans le bain fondu et le gaz pr\u00e9sent dans les inclusions peuvent \u00e9galement \u00eatre \u00e9vacu\u00e9s de la surface du liquide par flottation au cours du processus de remont\u00e9e des bulles, ce qui permet d\u2019atteindre l\u2019objectif de d\u00e9gazage du m\u00e9tal fondu.<\/p>","protected":false},"excerpt":{"rendered":"
Molten Metal Degassing is important step in metal casting process. Degassing with Nitrogen is usually used. Inert gas refers to the gas that does not…<\/p>","protected":false},"author":1,"featured_media":4716,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4347,4686],"class_list":["post-4715","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-degassing-with-nitrogen","tag-molten-metal-degassing"],"yoast_head":"\n
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