{"id":6004,"date":"2020-10-25T02:57:52","date_gmt":"2020-10-25T02:57:52","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6004"},"modified":"2020-10-26T03:23:48","modified_gmt":"2020-10-26T03:23:48","slug":"aluminum-nitrogen-degasser","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-nitrogen-degasser\/","title":{"rendered":"D\u00e9gazeur \u00e0 azote pour l'aluminium"},"content":{"rendered":"

Le d\u00e9gazeur \u00e0 azote pour l'aluminium sert \u00e0 contr\u00f4ler la teneur en hydrog\u00e8ne, en m\u00e9taux alcalins et en inclusions dans la masse d'aluminium fondu avant la coul\u00e9e.
\nAu cours des deux derni\u00e8res d\u00e9cennies, les machines de d\u00e9gazage \u00e0 l'aluminium et \u00e0 l'azote ont connu un d\u00e9veloppement relativement complet.<\/p>\n

Solubilit\u00e9 de l'hydrog\u00e8ne et param\u00e8tres influents : L'aluminium en fusion interagit en permanence avec l'atmosph\u00e8re, ce qui entra\u00eene l'\u00e9tablissement d'un \u00e9quilibre entre l'hydrog\u00e8ne gazeux pr\u00e9sent dans l'air et l'hydrog\u00e8ne contenu dans l'aluminium en fusion.
\nMais la pression partielle (c'est-\u00e0-dire la concentration) d'hydrog\u00e8ne dans l'atmosph\u00e8re est pratiquement n\u00e9gligeable.
\nPar cons\u00e9quent, l'hydrog\u00e8ne provient de la vapeur d'eau pr\u00e9sente dans l'atmosph\u00e8re, et celle-ci r\u00e9agit facilement avec l'aluminium liquide pour former deux produits de r\u00e9action probl\u00e9matiques, \u00e0 savoir l'oxyde d'aluminium (inclusion) et l'hydrog\u00e8ne (gaz).
\nL'aluminium pose un probl\u00e8me li\u00e9 \u00e0 l'hydrog\u00e8ne, non pas parce que celui-ci est particuli\u00e8rement soluble dans l'aluminium liquide, mais parce qu'il est particuli\u00e8rement insoluble dans l'aluminium solide ; l'hydrog\u00e8ne va donc se pr\u00e9cipiter hors de la solution lors de la solidification.
\nLa solubilit\u00e9 d\u00e9pend principalement de la temp\u00e9rature de l'aluminium. Veuillez vous procurer un d\u00e9gazeur d'aluminium sur le site sales@alalloycasting.com.<\/p>\n

\"D\u00e9gazeur<\/p>\n

Le d\u00e9gazeur \u00e0 azote pour l'aluminium doit \u00e9liminer l'hydrog\u00e8ne de la masse fondue avant de purger celle-ci avec de l'azote, un gaz inerte.
\nComprendre le \u00e9limination de l'hydrog\u00e8ne<\/a> Ce m\u00e9canisme est essentiel pour identifier et agir sur les facteurs qui d\u00e9terminent la meilleure m\u00e9thode d'\u00e9limination.
\nL'hydrog\u00e8ne atomique est dissous dans de l'aluminium liquide et r\u00e9parti de mani\u00e8re homog\u00e8ne.
\nLorsque les bulles inertes s\u00e8ches sont introduites dans la masse fondue, la pression partielle interne d'hydrog\u00e8ne est pratiquement nulle.
\nDans la bulle d'azote, un \u00e9quilibre local s'\u00e9tablit rapidement entre la concentration en H et la pression partielle de H dans la couche limite fondue.
\nLe taux de diffusion de l'hydrog\u00e8ne du corps humain vers la couche limite est limit\u00e9, et la recombinaison de l'hydrog\u00e8ne, passant de l'\u00e9tat atomique \u00e0 l'\u00e9tat mol\u00e9culaire, est tr\u00e8s rapide.
\nLa concentration en hydrog\u00e8ne dans les bulles augmente \u00e0 mesure qu'elles remontent vers la surface de la masse fondue.
\nLe d\u00e9bit de transfert de l'hydrog\u00e8ne d\u00e9pend non seulement de la vitesse de diffusion, mais aussi de la surface totale de l'interface de la bulle.
\nUn flux donn\u00e9 de gaz inerte pr\u00e9sente une surface d'interface plus importante et peut contenir des bulles plus petites.<\/p>\n

De plus, \u00e0 mesure que les bulles deviennent plus petites, la dur\u00e9e pendant laquelle chacune d'elles reste dans la masse fondue s'allonge. Cela s'explique par la r\u00e9duction de la vitesse finale, ce qui allonge le temps n\u00e9cessaire \u00e0 l'apport d'hydrog\u00e8ne.
\nUne zone de r\u00e9action plus profonde permet de disposer de plus de temps pour atteindre l'\u00e9quilibre, car les bulles restent plus longtemps dans la masse fondue avant d'atteindre la surface.
\nPar cons\u00e9quent, le d\u00e9gazeur \u00e0 azote pour l'aluminium doit produire les bulles les plus fines au fond de la cuve de traitement.
\nCe r\u00e9sultat est obtenu \u00e0 des vitesses de rotor \u00e9lev\u00e9es. La masse fondue est \u00e9galement m\u00e9lang\u00e9e afin d'obtenir une r\u00e9partition homog\u00e8ne de l'hydrog\u00e8ne.
\nLe proc\u00e9d\u00e9 par pistolet de pulv\u00e9risation constitue la premi\u00e8re \u00e9tape du d\u00e9gazage industriel ; toutefois, les pistolets de pulv\u00e9risation produisent g\u00e9n\u00e9ralement des bulles grossi\u00e8res d'un diam\u00e8tre compris entre 10 et 50 mm, avec une large distribution des tailles de bulles et une homog\u00e9n\u00e9it\u00e9 limit\u00e9e de la masse fondue.
\nLes briques respirantes, qu'elles soient raccord\u00e9es \u00e0 la sortie du pistolet de projection ou au fond du four, g\u00e9n\u00e8rent de petites bulles dont le diam\u00e8tre est g\u00e9n\u00e9ralement compris entre 10 et 20 mm ; mais m\u00eame avec celles-ci, l'homog\u00e9n\u00e9isation et la r\u00e9partition des bulles ne sont pas optimales.
\nEnfin, la mise au point d'un syst\u00e8me \u00e0 jet rotatif \u00e9quip\u00e9 d'un rotor r\u00e9sout le probl\u00e8me de la distribution insuffisante du gaz et permet d'obtenir des bulles dont le diam\u00e8tre est compris entre 3 et 10 mm.<\/p>","protected":false},"excerpt":{"rendered":"

The aluminum nitrogen degasser is used to control the content of hydrogen, alkali metals and inclusions in the aluminum melt before casting. In the past…<\/p>","protected":false},"author":1,"featured_media":6005,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[5305,5301,5304,5303,5302,5297,5286,5300,5310,5287,5299,5307,5298,5289,5309,5288,5311,5313,5312,5314,5315,5308,5306,5291,5292,5296,5293,5294,5295,5290],"class_list":["post-6004","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-aluminum-nitrogen-degasser-for-alpha-aluminium-singapore","tag-aluminum-nitrogen-degasser-for-aluminium-singapore","tag-aluminum-nitrogen-degasser-for-aluminium-singapore-buy","tag-aluminum-nitrogen-degasser-for-aluminium-singapore-price","tag-aluminum-nitrogen-degasser-for-aluminium-singapore-supplier","tag-aluminum-nitrogen-degasser-for-aluminum-singapore","tag-aluminum-nitrogen-degasser-for-alva-aluminum-thailand","tag-aluminum-nitrogen-degasser-for-anodized-aluminum-singapore","tag-aluminum-nitrogen-degasser-for-apex-aluminium-singapore","tag-aluminum-nitrogen-degasser-for-hal-aluminum-thailand","tag-aluminum-nitrogen-degasser-for-lhl-aluminum-singapore","tag-aluminum-nitrogen-degasser-for-nanshan-aluminium-singapore","tag-aluminum-nitrogen-degasser-for-nanshan-aluminum-singapore","tag-aluminum-nitrogen-degasser-for-nikkei-mc-aluminium","tag-aluminum-nitrogen-degasser-for-pacific-aluminium-singapore","tag-aluminum-nitrogen-degasser-for-rec-aluminum-thailand","tag-aluminum-nitrogen-degasser-for-singapore-aluminium","tag-aluminum-nitrogen-degasser-for-singapore-aluminium-group-pte-ltd","tag-aluminum-nitrogen-degasser-for-singapore-aluminium-suppier","tag-aluminum-nitrogen-degasser-for-singapore-aluminum","tag-aluminum-nitrogen-degasser-for-singapore-aluminum-supplier","tag-aluminum-nitrogen-degasser-for-sunjet-aluminium-singapore","tag-aluminum-nitrogen-degasser-for-tc-aluminium-singapore","tag-aluminum-nitrogen-degasser-for-thailand-aluminum","tag-aluminum-nitrogen-degasser-for-thailand-aluminum-factory","tag-aluminum-nitrogen-degasser-for-thailand-aluminum-foil","tag-aluminum-nitrogen-degasser-for-thailand-aluminum-industry","tag-aluminum-nitrogen-degasser-for-thailand-aluminum-scrap","tag-aluminum-nitrogen-degasser-for-thailand-aluminum-smelter","tag-aluminum-nitrogen-degasser-for-united-aluminum-thailand"],"yoast_head":"\nAluminum Nitrogen Degasser used to Remove Hydrogen<\/title>\n<meta name=\"description\" content=\"The aluminum nitrogen degasser is used to control the content of hydrogen, alkali metals and inclusions in the aluminum melt before casting.\" \/>\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-nitrogen-degasser\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aluminum Nitrogen Degasser used to Remove Hydrogen\" \/>\n<meta property=\"og:description\" content=\"The aluminum nitrogen degasser is used to control the content of hydrogen, alkali metals and inclusions in the aluminum melt before casting.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.alalloycasting.com\/fr\/aluminum-nitrogen-degasser\/\" \/>\n<meta property=\"og:site_name\" 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