{"id":3939,"date":"2020-08-19T10:13:02","date_gmt":"2020-08-19T10:13:02","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3939"},"modified":"2020-08-19T10:13:02","modified_gmt":"2020-08-19T10:13:02","slug":"refining-of-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/refining-of-molten-aluminum\/","title":{"rendered":"Affinage de l'aluminium fondu"},"content":{"rendered":"<p>L'affinage de l'aluminium fondu consiste \u00e0 \u00e9liminer les gaz et les inclusions pr\u00e9sents dans l'alliage d'aluminium. \u00c9tant donn\u00e9 que les deux processus de fusion et d'affinage de l'alliage d'aluminium sont g\u00e9n\u00e9ralement combin\u00e9s, on les d\u00e9signe sous le terme d'\u00ab affinage \u00bb dans la pratique industrielle. Le gaz pr\u00e9sent dans l'alliage d'aluminium \u00e9tant principalement de l'hydrog\u00e8ne, le d\u00e9gazage consiste essentiellement \u00e0 \u00e9liminer cet hydrog\u00e8ne.<\/p>\n<p>\u00c0 l'heure actuelle, la principale m\u00e9thode d'affinage de l'aluminium fondu consiste \u00e0 produire une grande quantit\u00e9 de gaz en <a href=\"http:\/\/www.alalloycasting.com\/fr\/refining-agent\/\">agent de raffinage<\/a> dans l'alliage d'aluminium. Le corps de la bulle peut r\u00e9sulter d'une r\u00e9action chimique interne au sein de l'aluminium liquide, ou bien provenir d'une partie de l'agent de d\u00e9gazage raffin\u00e9 ajout\u00e9 directement selon le principe de la pression partielle, afin de dissoudre l'hydrog\u00e8ne dans l'aluminium ; les particules se diffusent alors vers la bulle. \u00c0 ce stade, la pression partielle de la bulle est nulle et sa densit\u00e9 est inf\u00e9rieure \u00e0 celle de l'aluminium. Lorsque la bulle remonte \u00e0 la surface de l\u2019aluminium fondu, elle \u00e9clate et l\u2019hydrog\u00e8ne s\u2019\u00e9chappe dans l\u2019atmosph\u00e8re, ce qui permet finalement d\u2019atteindre l\u2019objectif d\u2019\u00e9limination de l\u2019hydrog\u00e8ne. Le principe de l\u2019\u00e9limination des scories est le m\u00eame que celui du d\u00e9gazage : \u201c l\u2019\u00e9limination des scories est la base du d\u00e9gazage \u201d.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3940\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/08\/Refining-of-Molten-Aluminum.jpg\" alt=\"Affinage de l&#039;aluminium fondu\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Refining-of-Molten-Aluminum.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Refining-of-Molten-Aluminum-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Bien que la densit\u00e9 de l\u2019alumine solide soit similaire \u00e0 celle de l\u2019aluminium fondu, il lui faut un temps suffisamment long pour atteindre le fond du creuset apr\u00e8s avoir p\u00e9n\u00e9tr\u00e9 dans l\u2019aluminium fondu. Cependant, le film d\u2019oxyde form\u00e9 apr\u00e8s l\u2019oxydation de l\u2019aluminium fondu ne comporte qu\u2019un grand nombre de pores de grand diam\u00e8tre, en contact \u00e9troit avec l\u2019aluminium fondu. Sa surface sp\u00e9cifique \u00e9tant importante, les substances adsorb\u00e9es ont tendance \u00e0 remonter vers la surface. Par cons\u00e9quent, la diff\u00e9rence de densit\u00e9 entre ce film d\u2019oxyde et l\u2019aluminium fondu est faible. Lorsqu\u2019il est m\u00e9lang\u00e9 \u00e0 la masse fondue, sa vitesse de remont\u00e9e et de descente est tr\u00e8s lente, et il est difficile de l\u2019\u00e9liminer de l\u2019aluminium fondu, ce qui entra\u00eene la formation de pores et d\u2019inclusions dans la pi\u00e8ce moul\u00e9e. Par cons\u00e9quent, la cl\u00e9 du transfert de l\u2019aluminium fondu r\u00e9side dans la r\u00e9duction au minimum du m\u00e9lange et du contact entre l\u2019aluminium fondu et l\u2019air.<\/p>\n<p>La m\u00e9thode la plus couramment utilis\u00e9e pour \u00e9liminer les microperforations dans les pi\u00e8ces moul\u00e9es en alliage d'aluminium est l'affinage par flux de l'aluminium fondu. Le proc\u00e9d\u00e9 le plus courant consiste \u00e0 d\u00e9gazer \u00e0 l\u2019aide de sels de chlorure et de chlorures pendant la fusion. Lors de l\u2019utilisation de sels de chlorure et d\u2019agents de d\u00e9gazage \u00e0 base de chlorure, il convient d\u2019utiliser une cloche \u00e0 vide pour enfoncer l\u2019agent de d\u00e9gazage \u00e0 100 m au fond du creuset, puis de le d\u00e9placer \u00e0 vitesse constante. Afin d\u2019\u00e9viter que l\u2019aluminium en fusion ne projette de grandes quantit\u00e9s de projections, l\u2019agent de d\u00e9gazage peut \u00eatre ajout\u00e9 par lots ; une fois le d\u00e9gazage et la formation de scories termin\u00e9s, il convient de laisser reposer le m\u00e9lange pendant un temps d\u00e9termin\u00e9. Pour les autres fondants m\u00e9talliques, l\u2019op\u00e9ration d\u2019affinage est identique.<\/p>","protected":false},"excerpt":{"rendered":"<p>Refining of molten aluminum refers to the removal of gases and inclusions in the aluminum alloy. Because the two processes of aluminum alloy smelting and&hellip;<\/p>","protected":false},"author":1,"featured_media":3940,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4335,4333,122,1708,4290,4289,4331,4336,4342,4344,4337,4343,4338,4332,2218,4334,4341,4339,4376,4375,4340,4374,123,4330,4328,4329],"class_list":["post-3939","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-casting-flux","tag-aluminium-degassing-tablets","tag-aluminum-casting-flux","tag-aluminum-casting-foundry-flux","tag-aluminum-degassing-flux","tag-aluminum-degassing-tablets","tag-aluminum-flux","tag-aluminum-flux-powder","tag-casting-flux","tag-coverall-flux","tag-degas-tablets","tag-degassing-agent","tag-degassing-tablets","tag-flux-aluminium","tag-flux-for-aluminum-melting","tag-flux-for-melting-aluminum-cans","tag-flux-melting","tag-foundry-flux","tag-how-does-de-gas-tablets-work","tag-how-does-degas-tablets-work","tag-low-temperature-flux","tag-molten-flux","tag-refining-flux","tag-tundish-covering-compound","tag-tundish-covering-powder","tag-tundish-powder"],"yoast_head":"<!-- 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