{"id":3244,"date":"2020-08-01T07:52:54","date_gmt":"2020-08-01T07:52:54","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3244"},"modified":"2020-08-20T09:55:59","modified_gmt":"2020-08-20T09:55:59","slug":"degassing-in-aluminum-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-in-aluminum-casting\/","title":{"rendered":"D\u00e9gazage dans la fonderie d'aluminium"},"content":{"rendered":"

Le d\u00e9gazage dans la coul\u00e9e d\u2019aluminium est important en raison de la particularit\u00e9 de l\u2019hydrog\u00e8ne dans l\u2019aluminium fondu : il s\u2019agit d\u2019un gaz pr\u00e9sentant une solubilit\u00e9 \u00e9vidente. Lorsque la temp\u00e9rature du m\u00e9tal fondu descend jusqu\u2019\u00e0 la temp\u00e9rature de solidification, la solubilit\u00e9 de l\u2019hydrog\u00e8ne diminue consid\u00e9rablement. Une fois la solidification termin\u00e9e, environ 5% du fluorure pr\u00e9sent dans l\u2019aluminium fondu y subsiste. Les 95% restants se trouvent dans la turbine. D\u00e8s qu\u2019ils atteignent le stade o\u00f9 ils peuvent former des bulles, ceux-ci sont \u00e9vacu\u00e9s dans le liquide.<\/p>\n

Cependant, l'aluminium est tr\u00e8s r\u00e9actif et a tendance \u00e0 r\u00e9duire ou \u00e0 d\u00e9composer l'eau avec laquelle il entre en contact.<\/p>\n

Afin d'obtenir des lingots de haute qualit\u00e9, il est n\u00e9cessaire d'\u00e9liminer les particules de poudre microm\u00e9triques jusqu'\u00e0 un niveau acceptable avant la solidification. La solution industrielle permettant d'\u00e9liminer ou de r\u00e9duire la teneur en glucides consiste \u00e0 faire passer un gaz inerte ou semi-inerte directement \u00e0 travers le bain d'aluminium fondu afin de le purifier avant la coul\u00e9e et la solidification.<\/p>\n

Par cons\u00e9quent, l'air peut de pr\u00e9f\u00e9rence \u00eatre purifi\u00e9 \u00e0 l'aide d'un gaz inerte ou trait\u00e9 sous vide.<\/p>\n

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

D\u00e9gazage dans la fonderie d'aluminium<\/h2>\n

Le taux d'\u00e9limination, c'est-\u00e0-dire la valeur r\u00e9siduelle finale de l'hydrog\u00e8ne, d\u00e9pend de plusieurs param\u00e8tres tels que la temp\u00e9rature du m\u00e9tal, la solubilit\u00e9 thermodynamique, le d\u00e9bit du gaz de purification, le d\u00e9bit du m\u00e9tal dans des conditions de d\u00e9gazage continu, la taille du four dans des conditions de d\u00e9gazage statique, ainsi que le rapport d'\u00e9limination du gaz et la taille des bulles ou la surface sp\u00e9cifique. Si le d\u00e9bit du gaz de purge est donn\u00e9, le taux d\u2019\u00e9limination de l\u2019hydrog\u00e8ne est d\u00e9termin\u00e9 par la taille des bulles. Plus les bulles sont petites, plus la vitesse de diffusion est \u00e9lev\u00e9e, et donc plus le taux d\u2019\u00e9limination est \u00e9lev\u00e9. Un simple pistolet pulv\u00e9risateur ou un tube peut g\u00e9n\u00e9rer de tr\u00e8s grosses bulles, ce qui se traduit par un taux d\u2019\u00e9limination relativement faible. Le taux d\u2019\u00e9limination peut \u00eatre am\u00e9lior\u00e9 en introduisant le gaz dans de petites bulles \u00e0 l\u2019aide d\u2019un bouchon poreux ou d\u2019un moteur rotatif qui cisaille le flux de gaz. Plus les bulles sont petites, plus la surface de contact augmente \u00e0 mesure que le taux de transfert augmente. Plus le diam\u00e8tre de Stoke de la bulle est petit, plus sa vitesse de remont\u00e9e est lente.<\/p>\n

L'utilisation de bulles inertes pour \u00e9liminer l'hydrog\u00e8ne de l'aluminium fondu pr\u00e9sente certaines limites. Pour que l'\u00e9limination soit efficace, il faut des bulles d'air relativement petites afin de maximiser la surface de contact. Les bulles les plus petites sont g\u00e9n\u00e9ralement obtenues \u00e0 l'aide d'un dispositif de d\u00e9gazage \u00e0 turbine rotative. Ce dispositif peut g\u00e9n\u00e9rer de tr\u00e8s petites bulles, capables de rester en suspension pendant longtemps. Le dispositif de d\u00e9gazage \u00e0 turbine rotative est g\u00e9n\u00e9ralement install\u00e9 \u00e0 une certaine distance de la machine de coul\u00e9e, afin que les bulles aient suffisamment de temps pour flotter et se s\u00e9parer.<\/p>\n

Lorsque l\u2019humidit\u00e9 contient des mat\u00e9riaux de contact r\u00e9fractaires, cette distance laisse \u00e9galement suffisamment de temps \u00e0 l\u2019hydrog\u00e8ne pour \u00eatre r\u00e9absorb\u00e9 dans l\u2019aluminium fondu \u00e0 partir de l\u2019humidit\u00e9 environnante. Compte tenu de l\u2019\u00e9quilibre entre la solubilit\u00e9 de l\u2019hydrog\u00e8ne et la temp\u00e9rature, la teneur minimale en hydrog\u00e8ne pouvant \u00eatre atteinte d\u00e9pend de la temp\u00e9rature. Plus la temp\u00e9rature est basse pendant le processus d'\u00e9limination de l'hydrog\u00e8ne, plus la teneur finale en hydrog\u00e8ne apr\u00e8s solidification est faible. Id\u00e9alement, l'\u00e9limination de l'hydrog\u00e8ne devrait avoir lieu juste avant le d\u00e9but de la solidification, mais cela est incompatible avec le processus de purification des gaz.<\/p>\n

Lorsque le dispositif de d\u00e9gazage rotatif<\/a> Si le syst\u00e8me ne produit pas suffisamment de petites bulles, d'autres probl\u00e8mes apparaissent \u00e9galement. Il est bien connu qu'outre le traitement de d\u00e9gazage, un traitement par filtration est \u00e9galement n\u00e9cessaire, qui fait appel \u00e0 des filtres \u00e0 lit profond ou \u00e0 des filtres en mousse c\u00e9ramique.<\/p>","protected":false},"excerpt":{"rendered":"

Degassing in aluminum casting is important because of the uniqueness of hydrogen in molten aluminum is a gas with obvious solubility. When the temperature of…<\/p>","protected":false},"author":1,"featured_media":3462,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[1765,2036,2004,2003,2005,2032,2035,2034,2033,2007,2028,2016,2017,2031,2041,2015,2008,2018,2030,2009,2010,2006,2002,2038,2029,2020,2014,2040,2019,2012,2011,2042,2044,2043,2045,2047,2046,2013,2039,2037,2022,2023,2027,2024,2025,2026,2021,1766],"class_list":["post-3244","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-degassing-in-aluminum-casting","tag-degassing-in-aluminum-casting-alpha-aluminium-singapore","tag-degassing-in-aluminum-casting-aluminium-empire-myanmar","tag-degassing-in-aluminum-casting-aluminium-factory-in-myanmar","tag-degassing-in-aluminum-casting-aluminium-scrap-myanmar","tag-degassing-in-aluminum-casting-aluminium-singapore","tag-degassing-in-aluminum-casting-aluminium-singapore-buy","tag-degassing-in-aluminum-casting-aluminium-singapore-price","tag-degassing-in-aluminum-casting-aluminium-singapore-supplier","tag-degassing-in-aluminum-casting-aluminium-thailand","tag-degassing-in-aluminum-casting-aluminum-singapore","tag-degassing-in-aluminum-casting-aluminum-thailand","tag-degassing-in-aluminum-casting-alva-aluminum-thailand","tag-degassing-in-aluminum-casting-anodized-aluminum-singapore","tag-degassing-in-aluminum-casting-apex-aluminium-singapore","tag-degassing-in-aluminum-casting-asahi-tec-aluminium-thailand","tag-degassing-in-aluminum-casting-fletcher-aluminium-thailand","tag-degassing-in-aluminum-casting-hal-aluminum-thailand","tag-degassing-in-aluminum-casting-lhl-aluminum-singapore","tag-degassing-in-aluminum-casting-lynn-aluminium-thailand","tag-degassing-in-aluminum-casting-meyer-aluminium-thailand","tag-degassing-in-aluminum-casting-myanmar-aluminium","tag-degassing-in-aluminum-casting-myanmar-aluminium-industry-co-ltd","tag-degassing-in-aluminum-casting-nanshan-aluminium-singapore","tag-degassing-in-aluminum-casting-nanshan-aluminum-singapore","tag-degassing-in-aluminum-casting-nikkei-mc-aluminium","tag-degassing-in-aluminum-casting-nikkei-siam-aluminium-thailand","tag-degassing-in-aluminum-casting-pacific-aluminium-singapore","tag-degassing-in-aluminum-casting-rec-aluminum-thailand","tag-degassing-in-aluminum-casting-reynaers-aluminium-thailand","tag-degassing-in-aluminum-casting-schimmer-aluminium-thailand","tag-degassing-in-aluminum-casting-singapore-aluminium","tag-degassing-in-aluminum-casting-singapore-aluminium-group-pte-ltd","tag-degassing-in-aluminum-casting-singapore-aluminium-suppier","tag-degassing-in-aluminum-casting-singapore-aluminum","tag-degassing-in-aluminum-casting-singapore-aluminum-company","tag-degassing-in-aluminum-casting-singapore-aluminum-supplier","tag-degassing-in-aluminum-casting-sms-aluminium-thailand","tag-degassing-in-aluminum-casting-sunjet-aluminium-singapore","tag-degassing-in-aluminum-casting-tc-aluminium-singapore","tag-degassing-in-aluminum-casting-thailand-aluminum","tag-degassing-in-aluminum-casting-thailand-aluminum-factory","tag-degassing-in-aluminum-casting-thailand-aluminum-foil","tag-degassing-in-aluminum-casting-thailand-aluminum-industry","tag-degassing-in-aluminum-casting-thailand-aluminum-scrap","tag-degassing-in-aluminum-casting-thailand-aluminum-smelter","tag-degassing-in-aluminum-casting-united-aluminum-thailand","tag-rotating-degassing-device"],"yoast_head":"\nDegassing In Aluminum Casting - 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