{"id":4938,"date":"2020-09-19T05:25:53","date_gmt":"2020-09-19T05:25:53","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4938"},"modified":"2020-09-19T05:25:53","modified_gmt":"2020-09-19T05:25:53","slug":"degassing-rotor","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-rotor\/","title":{"rendered":"Rotor de d\u00e9gazage"},"content":{"rendered":"

Le rotor de d\u00e9gazage constitue le meilleur choix pour une op\u00e9ration de d\u00e9gazage hautement efficace. Des gaz inertes tels que l'argon ou l'azote sont inject\u00e9s dans l'aluminium fondu via des arbres ou des rotors en c\u00e9ramique ou en graphite usin\u00e9. \u00c0 une certaine vitesse de rotation, de petites bulles de gaz inerte se forment et se r\u00e9partissent dans toute la masse fondue, r\u00e9duisant ainsi la teneur en hydrog\u00e8ne dissous au niveau le plus bas pouvant \u00eatre v\u00e9rifi\u00e9 par l'indice de densit\u00e9 du m\u00e9tal d\u00e9gaz\u00e9 %.<\/p>\n

La source d'hydrog\u00e8ne dans les alliages d'aluminium provient de l'humidit\u00e9 de la charge du four, des outils de construction, des mat\u00e9riaux r\u00e9fractaires et des additifs utilis\u00e9s pour le traitement des m\u00e9taux. Le niveau d'absorption d'hydrog\u00e8ne par les alliages d'aluminium d\u00e9pend du type d'alliage, de la temp\u00e9rature de travail et de l'atmosph\u00e8re.<\/p>\n

L'absorption d'hydrog\u00e8ne dans l'aluminium fondu est g\u00e9n\u00e9ralement comprise entre 0,01 et 0,8 ml\/100 g \u00e0 la temp\u00e9rature de fonctionnement. La pr\u00e9sence d'hydrog\u00e8ne entra\u00eene souvent la formation de pores gazeux, c'est-\u00e0-dire de vides dans les pi\u00e8ces moul\u00e9es, dont la surface est lisse, sans oxydation, ou pr\u00e9sentant quelques points d'oxydation superficiels. R\u00e9duire la teneur en hydrog\u00e8ne dissous au niveau le plus bas possible avant la coul\u00e9e est un facteur cl\u00e9 pour ma\u00eetriser le taux de rebut des pi\u00e8ces moul\u00e9es.<\/p>\n

Nous savons que si les bulles sont produites et r\u00e9parties de mani\u00e8re plus fine dans la masse fondue, l'efficacit\u00e9 du d\u00e9gazage s'en trouvera am\u00e9lior\u00e9e. Rotor de d\u00e9gazage en carbure de silicium d'AdTech unit\u00e9 de d\u00e9gazage <\/a>adopte une conception unique de la t\u00eate de rotor offrant une r\u00e9sistance \u00e9lev\u00e9e \u00e0 la corrosion, ce qui permet une r\u00e9partition plus homog\u00e8ne des bulles et garantit ainsi une efficacit\u00e9 de d\u00e9gazage \u00e9lev\u00e9e tout au long de sa dur\u00e9e de vie.<\/p>\n

\"Rotor<\/p>\n

Les essais montrent que les performances du rotor de d\u00e9gazage en SiC restent stables tout au long de sa dur\u00e9e de vie. La dur\u00e9e de vie du rotor en SiC est trois fois sup\u00e9rieure \u00e0 celle d'un rotor en graphite. M\u00eame apr\u00e8s une utilisation prolong\u00e9e, l'efficacit\u00e9 de d\u00e9gazage reste au niveau le plus bas, \u00e0 savoir 2,60 GM\/cc.<\/p>\n

Face \u00e0 une concurrence croissante, le secteur de la fonderie doit r\u00e9aliser des \u00e9conomies en roupies, en dollars am\u00e9ricains, en yens japonais, en euros, en RMB, etc. En g\u00e9n\u00e9ral, les consommables sont achet\u00e9s uniquement \u00e0 leur prix d\u2019achat, sans tenir compte des intrants li\u00e9s \u00e0 la production, \u00e0 la qualit\u00e9 ou \u00e0 la maintenance. M\u00eame si l\u2019on prend en compte les intrants d\u2019autres services, le co\u00fbt indirect r\u00e9el ne sera pas calcul\u00e9 par manque de temps, de ressources ou de compr\u00e9hension. Cette vision globale des d\u00e9cisions d\u2019achat est appel\u00e9e \u00ab co\u00fbt total de possession \u00bb dans le domaine financier.<\/p>\n

\u201cFacteurs de co\u00fbts \u201d directs \u201c et \u201d indirects \u00bb li\u00e9s \u00e0 l'utilisation d'un creuset : dur\u00e9e de vie du rotor de d\u00e9gazage, nombre de conversions, variables de processus, d\u00e9chets dus \u00e0 des probl\u00e8mes de performance, co\u00fbt de production, co\u00fbt \u00e9nerg\u00e9tique et co\u00fbt de la main-d'\u0153uvre qualifi\u00e9e.<\/p>\n

Les rotors de d\u00e9gazage en carbure de silicium ont \u00e9t\u00e9 test\u00e9s dans de nombreuses fonderies \u00e0 travers le monde. Leurs performances, caract\u00e9ris\u00e9es par une efficacit\u00e9 de d\u00e9gazage sup\u00e9rieure et une dur\u00e9e de vie plus longue, commencent \u00e0 offrir des avantages majeurs. Ces avantages sont actuellement quantifi\u00e9s afin d'\u00e9laborer des mod\u00e8les de co\u00fbt total de possession (TCO) destin\u00e9s \u00e0 aider les clients \u00e0 appr\u00e9hender la valeur de leurs produits au-del\u00e0 de leur simple co\u00fbt. Les op\u00e9rations de fusion doivent tenir compte des temps d'arr\u00eat, de la fiabilit\u00e9, de la main-d'\u0153uvre, des pi\u00e8ces non consommables, des stocks locaux et des d\u00e9lais de livraison.<\/p>","protected":false},"excerpt":{"rendered":"

Degassing rotor is the best choice for high efficiency degassing operation. Inert gases such as argon \/ nitrogen are blown into molten aluminum via ceramic…<\/p>","protected":false},"author":1,"featured_media":4939,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4938","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nDegassing Rotor for Hydrogen Removal in Molten Aluminum<\/title>\n<meta name=\"description\" content=\"Degassing rotor is the best choice for high efficiency degassing operation. 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