Perte lors de la coul\u00e9e d'aluminium<\/a> Terme g\u00e9n\u00e9rique d\u00e9signant le m\u00e9tal et l'alliage d'aluminium perdus au cours du processus de fusion en raison de l'oxydation, de la volatilisation et de la perte de m\u00e9tal irr\u00e9cup\u00e9rable r\u00e9sultant de l'interaction avec la paroi du four et l'agent d'affinage.<\/p>\nLa principale manifestation externe des pertes de coul\u00e9e peut \u00eatre divis\u00e9e en deux cat\u00e9gories : l'une se pr\u00e9sente sous la forme de cendres d'aluminium pur, et l'autre sous la forme d'aluminium en vrac, d'aluminium d\u00e9fectueux et de scories d'aluminium.<\/p>\n
Les \u00e9quations chimiques suivantes permettent de mieux comprendre le principe de la combustion oxydative de l'aluminium.<\/p>\n
Dans la plage de temp\u00e9ratures de fusion, l'aluminium pr\u00e9sente une forte affinit\u00e9 avec l'oxyg\u00e8ne et s'oxyde facilement. Apr\u00e8s oxydation, un film d'Al\u2082O\u2083 se forme \u00e0 la surface ; lorsque la temp\u00e9rature d\u00e9passe 500 \u00b0C, il s'agit alors de r-Al\u2082O\u2083 m\u00e9tastable.
\nAu cours de la transition entre le film d'oxyde m\u00e9tastable et le film d'oxyde stable, un r\u00e9tr\u00e9cissement volumique se produit, accompagn\u00e9 d'une oxydation suppl\u00e9mentaire et de la formation de fissures.
\n\u00c0 mesure que la temp\u00e9rature de l'aluminium fondu augmente et que le temps s'\u00e9coule, le film d'oxyde se d\u00e9veloppe plus rapidement, et la quantit\u00e9 ainsi que l'\u00e9paisseur de l'oxydation augmentent consid\u00e9rablement.<\/p>\n
Les facteurs qui influent sur la perte de coul\u00e9e sont les suivants :
\n1) Temp\u00e9rature de l'aluminium liquide.
\n2) Force de contact entre l'aluminium liquide et l'oxyg\u00e8ne.
\n3) Teneur en aluminium des scories d'aluminium.
\n4) Le m\u00e9tal en fusion d'aluminium \u00e9vacu\u00e9 par les scories.
\n5) Quel est le prix de l'aluminium d\u00e9fectueux et de l'aluminium en vrac ?.
\n6) Autres pertes<\/p>\n
Comment r\u00e9duire les pertes lors de la coul\u00e9e d'aluminium en fonderie ?<\/p>\n
R\u00e9duire la force de contact entre l'aluminium liquide et l'air. Plus la force de contact entre l'aluminium liquide et l'oxyg\u00e8ne est importante, plus les pertes dues \u00e0 l'oxydation sont importantes, et plus les pertes de coul\u00e9e sont \u00e9lev\u00e9es.<\/p>","protected":false},"excerpt":{"rendered":"
Aluminum Foundry Casting converts liquid aluminum into finished products and semi-finished products of aluminum ingots, bars or other shapes through processes such as batching, stirring,…<\/p>","protected":false},"author":1,"featured_media":8140,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8139","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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