{"id":5049,"date":"2020-09-25T03:23:57","date_gmt":"2020-09-25T03:23:57","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5049"},"modified":"2020-09-25T03:23:57","modified_gmt":"2020-09-25T03:23:57","slug":"online-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/online-degassing\/","title":{"rendered":"D\u00e9gazage en ligne"},"content":{"rendered":"

Le d\u00e9gazage en ligne \u00e9tant effectu\u00e9 pendant l'\u00e9coulement de la masse d'aluminium en fusion, et le temps de contact entre l'azote et la masse \u00e9tant court, son efficacit\u00e9 de d\u00e9gazage est inf\u00e9rieure \u00e0 celle de l'affinage en four. Apr\u00e8s le d\u00e9gazage en ligne, les inclusions restantes et l\u2019hydrog\u00e8ne adsorb\u00e9 dans le bain fondu sont d\u00e9j\u00e0 tr\u00e8s faibles. Cependant, au cours de l\u2019\u00e9coulement du bain fondu, les inclusions sont entra\u00een\u00e9es et aspir\u00e9es, ce qui fait que la partie restante d\u2019hydrog\u00e8ne est la plus difficile \u00e0 \u00e9liminer.<\/p>\n

Apr\u00e8s filtration, la teneur en hydrog\u00e8ne a de nouveau baiss\u00e9, ce qui indique que le proc\u00e9d\u00e9 CFF a un certain effet d'\u00e9limination de l'hydrog\u00e8ne. Le m\u00e9canisme r\u00e9side dans le fait que la teneur en hydrog\u00e8ne de l'aluminium fondu est fortement influenc\u00e9e par la teneur en inclusions. \u00c0 teneur en hydrog\u00e8ne \u00e9gale, plus la teneur en inclusions est \u00e9lev\u00e9e, plus le taux de piq\u00fbres du lingot est important. M\u00eame \u00e0 faible concentration en hydrog\u00e8ne, ce taux reste tr\u00e8s \u00e9lev\u00e9 et il est difficile de l'\u00e9liminer par des m\u00e9thodes classiques. \u00c0 l'inverse, lorsque la teneur en inclusions dans l'aluminium fondu est tr\u00e8s faible, la teneur en hydrog\u00e8ne est \u00e9galement faible. M\u00eame si de l\u2019hydrog\u00e8ne est inject\u00e9 artificiellement dans l\u2019aluminium fondu, celui-ci s\u2019\u00e9chappe automatiquement pour revenir \u00e0 sa teneur initiale. C\u2019est ce qu\u2019on appelle le m\u00e9canisme parasitaire des inclusions d\u2019hydrog\u00e8ne. Autrement dit, la sursaturation atteinte avant la formation de la bulle d\u2019hydrog\u00e8ne est fonction du nombre de sites de nucl\u00e9ation des bulles d\u2019hydrog\u00e8ne, et les inclusions d\u2019oxyde et autres jouent le r\u00f4le de noyau de bulle.<\/p>\n

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

AdTech filtre en mousse c\u00e9ramique<\/a> Ce syst\u00e8me repose sur le principe de l'adsorption pour la filtration, ce qui permet d'\u00e9liminer efficacement les grosses inclusions pr\u00e9sentes dans l'aluminium en fusion et d'adsorber efficacement les inclusions de l'ordre du micron ; la pr\u00e9cision de filtration est \u00e9lev\u00e9e pour une m\u00eame taille de maille. Il permet d'am\u00e9liorer la qualit\u00e9 de surface, les performances du produit et la microstructure. Il ne laisse pas tomber de scories et r\u00e9duit efficacement la pollution de l'aluminium fondu. Bonne r\u00e9sistance aux chocs thermiques et r\u00e9sistance am\u00e9lior\u00e9e \u00e0 la corrosion par le m\u00e9tal fondu. Production automatis\u00e9e sur cha\u00eene de montage, trois proc\u00e9dures d'\u00e9talonnage, dimensions pr\u00e9cises, mieux adapt\u00e9 au caisson de filtration.<\/p>","protected":false},"excerpt":{"rendered":"

Because online degassing is degassing during the flow of the aluminum melt, and the time for nitrogen to contact the melt is short, its degassing…<\/p>","protected":false},"author":1,"featured_media":5089,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5049","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nOnline Degassing and Filtering for Molten Aluminum<\/title>\n<meta name=\"description\" content=\"After online degassing, the remaining inclusions and hydrogen in melt are very small. 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