flux de raffinage<\/a> L'ajout de ces \u00e9l\u00e9ments dans les masses fondues d'aluminium et d'alliages d'aluminium permet de r\u00e9duire consid\u00e9rablement le taux de piq\u00fbres et la porosit\u00e9 des pi\u00e8ces moul\u00e9es obtenues.<\/p>\n![\"\"](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/10\/Molten-Aluminum-Refining-Process.jpg\")
<\/p>\n
L'effet de d\u00e9gazage de l'aluminium fondu \u00e0 l'aide de fondants se manifeste principalement sous les deux aspects suivants :<\/strong><\/p>\n(1) Le composant de flux pr\u00e9sente une plus grande affinit\u00e9 avec l'hydrog\u00e8ne et est capable d'absorber et de dissoudre de grandes quantit\u00e9s d'hydrog\u00e8ne. Les composants de flux et l'hydrog\u00e8ne forment des compos\u00e9s stables \u00e0 haut point de fusion, ce qui r\u00e9duit la teneur en hydrog\u00e8ne dissous dans la masse fondue et diminue consid\u00e9rablement la teneur en hydrog\u00e8ne et le taux de microperforations de l'aluminium, tandis que les compos\u00e9s de flux \u00e0 haut point de fusion sont \u00e9limin\u00e9s sous forme de scories.<\/p>\n
(2) Il est impossible que les bulles d\u2019hydrog\u00e8ne se forment de mani\u00e8re homog\u00e8ne dans l\u2019aluminium et les alliages d\u2019aluminium ; leur formation ne peut se faire que par nucl\u00e9ation h\u00e9t\u00e9rog\u00e8ne. Le noyau de nucl\u00e9ation peut \u00eatre constitu\u00e9 par les particules solides pr\u00e9sentes dans la masse fondue, la paroi du moule, le front de l\u2019interface solide-liquide ou la phase initiale. Une fois le fondant ajout\u00e9 au bain de fusion, ses propri\u00e9t\u00e9s chimiques extr\u00eamement r\u00e9actives lui permettent de r\u00e9agir avec les inclusions d\u2019Al\u2082O\u2083 pr\u00e9sentes dans le bain de fusion afin de r\u00e9duire la teneur en inclusions ou de modifier leur morphologie. De plus, le fondant exerce \u00e9galement un effet m\u00e9tamorphique sur certaines phases primaires du bain de fusion au cours du processus de solidification. La phase primaire passe de bandes grossi\u00e8res \u00e0 de fines sph\u00e8res, ce qui r\u00e9duit consid\u00e9rablement le noyau de nucl\u00e9ation des bulles dans la masse fondue, r\u00e9duisant ainsi les pores dans les pi\u00e8ces moul\u00e9es en aluminium et en alliages d\u2019aluminium.<\/p>","protected":false},"excerpt":{"rendered":"
Aluminum and aluminum alloys are easy to inhale and form inclusions during the smelting and pouring process, which directly affects the quality of their products.…<\/p>","protected":false},"author":1,"featured_media":10608,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10607","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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