{"id":5885,"date":"2020-10-23T02:13:21","date_gmt":"2020-10-23T02:13:21","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5885"},"modified":"2020-10-23T02:13:21","modified_gmt":"2020-10-23T02:13:21","slug":"cast-non-ferrous-metals","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/cast-non-ferrous-metals\/","title":{"rendered":"M\u00e9taux non ferreux moul\u00e9s"},"content":{"rendered":"

Les m\u00e9taux non ferreux moul\u00e9s comprennent les alliages d'aluminium, de magn\u00e9sium, de cuivre, de zinc, de titane et les alliages pour roulements. Les \u00e9quipements destin\u00e9s \u00e0 la fusion et \u00e0 l'affinage des m\u00e9taux non ferreux comprennent des fours, des \u00e9quipements de d\u00e9gazage en ligne et des unit\u00e9s de filtration \u00e0 mousse c\u00e9ramique. Les fours \u00e0 creuset sont g\u00e9n\u00e9ralement utilis\u00e9s dans les usines de petite et moyenne taille.<\/p>\n

M\u00e9taux non ferreux moul\u00e9s<\/strong><\/p>\n

Les alliages d'aluminium destin\u00e9s \u00e0 la fonderie se r\u00e9partissent en quatre cat\u00e9gories : les alliages aluminium-silicium, aluminium-cuivre, magn\u00e9sium en creuset et aluminium-zinc. Parmi ceux-ci, les alliages les plus couramment utilis\u00e9s, \u00e0 savoir les alliages aluminium-silicium, sont g\u00e9n\u00e9ralement fondus dans des fours \u00e0 creuset ou des fours \u00e0 r\u00e9verb\u00e8re.<\/p>\n

L'alliage d'aluminium pr\u00e9sente un point de fusion bas et une bonne fluidit\u00e9, mais il a tendance \u00e0 s'impr\u00e9gner de gaz pendant le processus de fusion. La majeure partie du gaz pr\u00e9sent dans l'aluminium fondu est de l'hydrog\u00e8ne (environ 80%), et on observe une quantit\u00e9 importante de scories d'oxydation telles que l'Al\u2082O\u2083. C'est pourquoi le d\u00e9gazage et l'\u00e9limination des scories sont essentiels \u00e0 la fusion.<\/p>\n

\"M\u00e9taux<\/p>\n

Afin d'\u00e9viter toute surchauffe du m\u00e9tal, il convient de r\u00e9duire autant que possible la dur\u00e9e de fusion et de diminuer l'aspiration. De plus, affinage du grain<\/a> (modification) est \u00e9galement n\u00e9cessaire. On utilise souvent des agents de raffinage dans la production, ou bien on utilise s\u00e9par\u00e9ment des agents de raffinage et des modificateurs.<\/p>\n

L'agent d'affinage \u00e0 base de nitrate de sodium et de graphite est ce qu'on appelle un produit \u201c non toxique \u201d agent de raffinage<\/a> d\u00e9velopp\u00e9 dans les ann\u00e9es 1970. Afin de modifier la microstructure de l'alliage d'aluminium, d'affiner le grain et d'am\u00e9liorer ses propri\u00e9t\u00e9s m\u00e9caniques, il est n\u00e9cessaire de modifier cet alliage ; les modificateurs \u00e0 base de strontium sont largement utilis\u00e9s dans sa fabrication.<\/p>\n

Il existe des dizaines de m\u00e9thodes de purification de la masse fondue d\u2019alliages d\u2019aluminium, qui peuvent \u00eatre regroup\u00e9es en trois cat\u00e9gories : le d\u00e9gazage par r\u00e9action non chimique, le d\u00e9gazage par r\u00e9action chimique et le d\u00e9gazage mixte. Le d\u00e9gazage par r\u00e9action non chimique comprend l'injection de gaz inerte, le traitement sous vide, la filtration, l'\u00e9lectromigration gazeuse et le traitement par ultrasons. Le d\u00e9gazage par r\u00e9action chimique d\u00e9signe principalement l'\u00e9limination de l'hydrog\u00e8ne des terres rares. Le d\u00e9gazage mixte comprend principalement la gaz\u00e9ification du flux, l'injection de gaz actif et l'injection de flux actif, etc.<\/p>","protected":false},"excerpt":{"rendered":"

Cast non-ferrous metals include aluminum alloys, magnesium alloys, copper alloys, zinc alloys, titanium alloys, and bearing alloys. 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