{"id":6017,"date":"2020-10-25T03:19:43","date_gmt":"2020-10-25T03:19:43","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6017"},"modified":"2020-10-26T03:21:22","modified_gmt":"2020-10-26T03:21:22","slug":"degassing-device-for-aluminium","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-device-for-aluminium\/","title":{"rendered":"Dispositif de d\u00e9gazage pour l'aluminium"},"content":{"rendered":"

Le dispositif de d\u00e9gazage de l'aluminium permet d'\u00e9liminer les impuret\u00e9s pr\u00e9sentes dans la masse fondue afin d'obtenir un m\u00e9tal plus pur et de meilleure qualit\u00e9. Il s'agit de l'une des m\u00e9thodes de purification les plus couramment utilis\u00e9es et les plus efficaces dans les fonderies.<\/p>\n

L'aluminium fondu contient deux impuret\u00e9s principales : l'hydrog\u00e8ne dissous et les mati\u00e8res solides<\/p>\n

Inclusions non m\u00e9talliques. Lorsque le m\u00e9tal refroidit, l'hydrog\u00e8ne dissous s'\u00e9chappe de la solution et forme des pores nuisibles. Cette porosit\u00e9 et ces inclusions solides non m\u00e9talliques r\u00e9duisent la r\u00e9sistance et nuisent aux propri\u00e9t\u00e9s finales des pi\u00e8ces moul\u00e9es en aluminium.<\/p>\n

D\u00e9gazeur en ligne<\/p>\n

Dans le cas de l'aluminium, la r\u00e9action avec la vapeur d'eau se d\u00e9roule comme suit :<\/p>\n

\u00b72 Al + 3 H\u2082O = Al\u2082O\u2083 + 3 H\u2082<\/p>\n

L'hydrog\u00e8ne mol\u00e9culaire se dissocie ensuite dans le m\u00e9tal fondu :<\/p>\n

\u00b73 H2 = 6 heures<\/p>\n

L'aluminium fondu interagit \u00e9galement avec l'oxyg\u00e8ne de l'atmosph\u00e8re ; ainsi, outre la r\u00e9action d'oxydation repr\u00e9sent\u00e9e par l'\u00e9quation (a), les r\u00e9actions suivantes se produisent \u00e9galement :<\/p>\n

\u00b74 Al + 3 O\u2082 = 2 Al\u2082O\u2083<\/p>\n

Cette r\u00e9action entra\u00eene la formation de crasses \u00e0 la surface du m\u00e9tal en fusion pendant le processus de fusion, et tout transfert du m\u00e9tal en fusion s'ensuit.
\nLes oxydes produits sont pi\u00e9g\u00e9s dans la majeure partie de la masse fondue, puis transf\u00e9r\u00e9s dans la pi\u00e8ce moul\u00e9e finie.
\nD'autres inclusions non m\u00e9talliques, telles que les carbures, les nitrures ou les borures, peuvent provenir de sources telles que les mat\u00e9riaux des creusets ou d'autres mat\u00e9riaux r\u00e9fractaires.<\/p>\n

\"Dispositif<\/p>\n

Par cons\u00e9quent, dispositif de d\u00e9gazage<\/a> Pour l'aluminium, il faut utiliser un proc\u00e9d\u00e9 permettant d'\u00e9liminer l'hydrog\u00e8ne dissous et les inclusions non m\u00e9talliques de l'aluminium fondu avant la coul\u00e9e afin d'obtenir la meilleure qualit\u00e9 possible.
\nLe proc\u00e9d\u00e9 mis au point pour le nettoyage des m\u00e9taux est un proc\u00e9d\u00e9 physique faisant appel \u00e0 un flux de gaz inerte.
\nL'hydrog\u00e8ne dissous dans le bain fondu se diffuse dans les bulles ascendantes du gaz de flux et est transport\u00e9 vers la surface du bain fondu. Ce processus comporte deux \u00e9tapes principales :<\/p>\n

La vitesse \u00e0 laquelle l'hydrog\u00e8ne se diffuse dans des bulles inertes \u00e0 travers la couche limite de diffusion
\nConcentration d'hydrog\u00e8ne dans des bulles inertes
\nLa diffusion est l'\u00e9tape d\u00e9terminante du taux de d\u00e9gazage. Par cons\u00e9quent, afin d'obtenir la meilleure efficacit\u00e9 de d\u00e9gazage possible, les conditions suivantes doivent \u00eatre respect\u00e9es :<\/p>\n

Les bulles de gaz inerte sont plus petites et leur temps de s\u00e9jour dans le m\u00e9tal en fusion est plus long. Cela garantit une grande surface de contact entre les bulles de gaz inerte et le m\u00e9tal en fusion, assurant ainsi un coefficient de transfert de masse plus \u00e9lev\u00e9 par rapport \u00e0 la couche de diffusion.<\/p>\n

La r\u00e9partition des bulles inertes sur l'ensemble de la section transversale du m\u00e9tal en fusion est tr\u00e8s \u00e9tendue
\nLa vitesse \u00e9lev\u00e9e du mat\u00e9riau en fusion acc\u00e9l\u00e8re le transfert d'hydrog\u00e8ne vers la bulle inerte
\nLa surface statique du bain de fusion doit \u00eatre prot\u00e9g\u00e9e afin d'\u00e9viter toute r\u00e9action avec l'atmosph\u00e8re susceptible d'entra\u00eener l'absorption d'hydrog\u00e8ne frais.<\/p>","protected":false},"excerpt":{"rendered":"

The degassing device for aluminium can remove impurities in the melt to provide cleaner and better quality metal. It is one of the most commonly…<\/p>","protected":false},"author":1,"featured_media":6018,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[5188,5189,5195,5205,5182,5181,5203,5204,5187,5183,5199,5209,5201,5206,5196,5208,5193,5190,5191,5192,5194,5186,5207,5197,5185,5198,5210,5184,5202,5200],"class_list":["post-6017","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-degassing-device-for-aluminium-philippine","tag-degassing-device-for-aluminium-supplier-philippine","tag-degassing-device-for-aluminium-vietnam","tag-degassing-device-for-aluminum-factory-in-vietnam","tag-degassing-device-for-aluminum-philippines-location","tag-degassing-device-for-aluminum-philippines-news","tag-degassing-device-for-aluminum-vietnam","tag-degassing-device-for-aluminum-vietnamese","tag-degassing-device-for-anodized-aluminum-philippines","tag-degassing-device-for-brothers-aluminum-philippines","tag-degassing-device-for-daiki","tag-degassing-device-for-global-aluminum-vietnam","tag-degassing-device-for-goldwell-aluminium-vietnam","tag-degassing-device-for-hiroshima-aluminum-vietnam","tag-degassing-device-for-hyundai-aluminium-vietnam","tag-degassing-device-for-hyundai-aluminum-vietnam","tag-degassing-device-for-philippines-aluminium","tag-degassing-device-for-philippines-aluminum","tag-degassing-device-for-philippines-aluminum-supplier","tag-degassing-device-for-philippines-sheet-aluminum","tag-degassing-device-for-philippines-supplier-aluminium","tag-degassing-device-for-reynolds-aluminum-philippines","tag-degassing-device-for-sapa-aluminum-vietnam","tag-degassing-device-for-schuco-aluminium-vietnam","tag-degassing-device-for-t-slot-aluminum-philippines","tag-degassing-device-for-thq-aluminium-vietnam","tag-degassing-device-for-tung-shin-aluminum-vietnam","tag-degassing-device-for-unicom-aluminum-philippines","tag-degassing-device-for-vietnam-aluminium-association","tag-degassing-device-for-xinfa-aluminium-vietnam"],"yoast_head":"\nDegassing Device for Aluminium Melt Hydrogen Removal<\/title>\n<meta name=\"description\" content=\"The degassing device for aluminium can remove hydrogen and impurities to provide cleaner metal. 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