{"id":8611,"date":"2021-04-28T09:06:57","date_gmt":"2021-04-28T09:06:57","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8611"},"modified":"2021-04-28T09:06:57","modified_gmt":"2021-04-28T09:06:57","slug":"aluminum-melt-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-melt-degassing\/","title":{"rendered":"D\u00e9gazage de l'aluminium fondu"},"content":{"rendered":"

Le d\u00e9gazage de l'aluminium en fusion consiste \u00e0 injecter de l'azote dans la masse d'alliage d'aluminium en fusion, o\u00f9 il est broy\u00e9 par un rotor rotatif en nitrure de silicium, ce qui g\u00e9n\u00e8re un grand nombre de bulles de diffusion, permettant ainsi un contact complet entre le liquide d'alliage d'aluminium et l'azote dans la cuve de traitement.<\/p>\n

Conform\u00e9ment au principe de la diff\u00e9rence de pression et de l'adsorption en surface, les bulles absorbent l'hydrog\u00e8ne pr\u00e9sent dans le bain fondu et adsorbent les scories oxyd\u00e9es. Des scories se forment \u00e0 la surface du bain fondu. Le bain d'alliage d'aluminium s'\u00e9coule depuis la sortie du dispositif de d\u00e9gazage (situ\u00e9 dans la partie inf\u00e9rieure du creuset) vers la machine de coul\u00e9e. L'alliage d'aluminium liquide p\u00e9n\u00e8tre en continu dans le dispositif de d\u00e9gazage, et l'azote y est insuffl\u00e9 en continu. Gr\u00e2ce au processus de d\u00e9gazage, l'objectif de purification de l'alliage d'aluminium liquide est atteint.<\/p>\n

L'alliage d'aluminium est le mat\u00e9riau de structure en m\u00e9tal non ferreux le plus utilis\u00e9 dans l'industrie. Il est largement employ\u00e9 dans l'aviation, l'a\u00e9rospatiale, l'automobile, la construction m\u00e9canique, la construction navale, l'industrie chimique et d'autres secteurs. Avec le d\u00e9veloppement rapide de l'\u00e9conomie industrielle, la demande en alliage d'aluminium ne cesse d'augmenter. L'hydrog\u00e8ne se dissout dans le m\u00e9tal en fusion, se diffuse dans les bulles de gaz qui remontent \u00e0 la surface et est transport\u00e9 vers celle-ci. Le gaz et les inclusions ont une incidence sur le produit en aluminium. Le processus de d\u00e9gazage de l'aluminium en fusion est essentiel pour \u00e9liminer l'hydrog\u00e8ne dissous et les impuret\u00e9s non m\u00e9talliques du m\u00e9tal en fusion avant la coul\u00e9e, afin d'obtenir la meilleure qualit\u00e9 possible.<\/p>\n

\"D\u00e9gazage<\/p>\n

Structure principale d'une unit\u00e9 de d\u00e9gazage de l'aluminium fondu<\/h2>\n

M\u00e9canisme de levage hydraulique<\/strong><\/p>\n

Afin de garantir son positionnement pr\u00e9cis, le unit\u00e9 de d\u00e9gazage de l'aluminium fondu<\/a> est \u00e9quip\u00e9 d'un dispositif de levage hydraulique servant \u00e0 contr\u00f4ler le d\u00e9placement vertical du rotor en nitrure de silicium et du syst\u00e8me de chauffage \u00e0 tige en carbure de silicium en forme de U, qui peut pivoter de 90\u00b0 \u00e0 l'horizontale. Le syst\u00e8me hydraulique offre une pr\u00e9cision de positionnement relativement stable.<\/p>\n

Syst\u00e8me de chauffage<\/strong><\/p>\n

Le syst\u00e8me de chauffage utilise un \u00e9l\u00e9ment chauffant \u00e9lectrique, et la tige en carbure de silicium en forme de U recouvre le tube de protection cylindrique en carbure de silicium ou en nitrure de silicium. Un thermocouple destin\u00e9 \u00e0 la mesure de la temp\u00e9rature est plac\u00e9 \u00e0 l'int\u00e9rieur du tube, ce qui permet d'assurer un contr\u00f4le automatique de la temp\u00e9rature ; la puissance peut \u00eatre r\u00e9gl\u00e9e librement dans une plage comprise entre 2 kW et 26 kW.<\/p>\n

Le syst\u00e8me de r\u00e9gulation de la temp\u00e9rature utilise un module d'alimentation int\u00e9gr\u00e9 plus sophistiqu\u00e9 afin d'assurer un contr\u00f4le enti\u00e8rement automatique et d'\u00e9viter ainsi les \u00e0-coups fr\u00e9quents lors de la mise en marche et de l'arr\u00eat du chauffage.
\nLes \u00e9l\u00e9ments chauffants en carbure de silicium en forme de U sont souvent affect\u00e9s par le courant principal lors de cycles fr\u00e9quents de mise en marche et d'arr\u00eat.<\/p>\n

Le dispositif de chauffage de l'\u00e9tage sans r\u00e9servoir tampon s'use facilement et a une dur\u00e9e de vie r\u00e9duite.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum Melt Degassing uses the nitrogen blown into the aluminum alloy melt to be crushed by the rotating silicon nitride rotor, forming a large number…<\/p>","protected":false},"author":1,"featured_media":8612,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8611","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminum Melt Degassing with Nitrogen Used for Foundry<\/title>\n<meta name=\"description\" content=\"The aluminum melt degassing process is essential to remove dissolved hydrogen and non-metallic content from molten metal.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/aluminum-melt-degassing\/\" \/>\n<meta property=\"og:locale\" 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