purification par fusion<\/a>\u00a0m\u00e9thodes.<\/p>\nLe filtre en c\u00e9ramique d'alumine moul\u00e9 dans l'aluminium joue un r\u00f4le essentiel dans la qualit\u00e9 de la fonte d'aluminium et a une grande influence sur les performances des \u00e9tapes de transformation suivantes ainsi que sur la qualit\u00e9 du produit final.<\/p>\n
Le retrait et la porosit\u00e9 comptent parmi les principaux d\u00e9fauts des pi\u00e8ces moul\u00e9es. Cela s'explique par le fait que le retrait \u00e0 l'\u00e9tat liquide est sup\u00e9rieur au retrait \u00e0 l'\u00e9tat solide.
\nOn a constat\u00e9, lors de la production, que plus la plage de solidification des alliages d'aluminium moul\u00e9s est \u00e9troite, plus il est facile d'observer la formation de cavit\u00e9s de retrait concentr\u00e9es, et que plus cette plage est large, plus il est facile d'observer la formation de cavit\u00e9s de retrait dispers\u00e9es.<\/p>\n
Par cons\u00e9quent, la conception doit permettre \u00e0 l'alliage d'aluminium moul\u00e9 de respecter le principe de solidification s\u00e9quentielle ; en d'autres termes, le retrait volumique de la pi\u00e8ce moul\u00e9e lors du passage de l'\u00e9tat liquide \u00e0 l'\u00e9tat solide doit \u00eatre compens\u00e9 par l'alliage liquide, de sorte que le retrait et la porosit\u00e9 se concentrent dans la couche externe.<\/p>\n
La fluidit\u00e9 d\u00e9signe la capacit\u00e9 du m\u00e9tal en fusion \u00e0 remplir le moule. C'est la fluidit\u00e9 qui d\u00e9termine si l'alliage permet de r\u00e9aliser des pi\u00e8ces moul\u00e9es complexes. Parmi les alliages d'aluminium, ce sont les alliages eutectiques qui pr\u00e9sentent la meilleure fluidit\u00e9.<\/p>\n
\u00c0 mesure que les exigences en mati\u00e8re de qualit\u00e9 des produits en aluminium ne cessent de s'accro\u00eetre, celles relatives aux plaques filtrantes deviennent elles aussi de plus en plus strictes. Le filtre en c\u00e9ramique d'alumine moul\u00e9 dans l'aluminium permet de r\u00e9duire les inclusions pr\u00e9sentes dans l'aluminium en fusion, de limiter les d\u00e9fauts de retrait et de transformer l'\u00e9coulement turbulent de l'aluminium en fusion en un \u00e9coulement laminaire.<\/p>","protected":false},"excerpt":{"rendered":"
Aluminum cast alumina ceramic filter has many advantages such as good chemical stability, high specific strength, high temperature resistance, thermal shock resistance, and large specific…<\/p>","protected":false},"author":1,"featured_media":11878,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-11877","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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