{"id":6823,"date":"2020-12-03T00:48:25","date_gmt":"2020-12-03T00:48:25","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6823"},"modified":"2020-12-03T00:48:25","modified_gmt":"2020-12-03T00:48:25","slug":"molten-aluminium-filtration-for-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-aluminium-filtration-for-casting\/","title":{"rendered":"Filtration de l'aluminium en fusion pour la coul\u00e9e"},"content":{"rendered":"<p>En effet, le m\u00e9tal en fusion, en particulier l'aluminium en fusion, contient souvent des solides entra\u00een\u00e9s, qui nuisent \u00e0 la qualit\u00e9 du produit moul\u00e9 final. Ces solides entra\u00een\u00e9s apparaissent sous forme d\u2019inclusions dans le produit moul\u00e9 final apr\u00e8s la solidification du m\u00e9tal en fusion, et entra\u00eenent une diminution de la ductilit\u00e9 du produit final ou une alt\u00e9ration de la finesse de surface et des propri\u00e9t\u00e9s d\u2019anodisation de celui-ci. Les inclusions peuvent provenir de plusieurs sources. Par exemple, elles peuvent provenir d\u2019un film d\u2019oxyde de surface qui se brise et est entra\u00een\u00e9 dans le m\u00e9tal en fusion. De plus, elles peuvent r\u00e9sulter d\u2019impuret\u00e9s insolubles, telles que des carbures, des borures, ou encore de la corrosion des mat\u00e9riaux r\u00e9fractaires du four et de la cuve. C\u2019est pourquoi la filtration de l\u2019aluminium en fusion destin\u00e9 \u00e0 la coul\u00e9e est indispensable.<\/p>\n<p>Il va de soi que il existe un besoin important de concevoir un filtre am\u00e9lior\u00e9 permettant d\u2019\u00e9liminer ou de r\u00e9duire les solides entra\u00een\u00e9s dans le produit moul\u00e9 final, en particulier pour la filtration de l\u2019aluminium fondu destin\u00e9 \u00e0 la coul\u00e9e, notamment lorsque le m\u00e9tal obtenu est utilis\u00e9 dans des produits d\u00e9coratifs, tels que des s\u00e9ries de bordures ou de plaques d\u00e9coratives en alliages d\u2019aluminium, comme les alliages 5252 et 5657. Parmi les autres alliages d\u2019aluminium qui b\u00e9n\u00e9ficient d\u2019une filtration am\u00e9lior\u00e9e, on peut citer les feuilles d\u2019aluminium pour condensateurs fabriqu\u00e9es \u00e0 partir d\u2019alliages de la s\u00e9rie 1000, tels que les alliages 1145 et 1188. Afin de r\u00e9duire les d\u00e9fauts de piq\u00fbres sur les produits destin\u00e9s au m\u00e9tro l\u00e9ger et d\u2019optimiser l\u2019efficacit\u00e9 du laminage ; les alliages extrud\u00e9s \u00e0 haute r\u00e9sistance, tels que les alliages d\u2019aluminium 2024 et 7075, pour obtenir une qualit\u00e9 ultrasonique \u00e9lev\u00e9e ; et les alliages extrud\u00e9s de la s\u00e9rie 6000, tels que l\u2019alliage d\u2019aluminium 6061, afin d\u2019obtenir une productivit\u00e9 plus \u00e9lev\u00e9e lors de l\u2019op\u00e9ration d\u2019extrusion.<\/p>\n<p>Les inclusions susmentionn\u00e9es entra\u00eenent une perte de performances de l'alliage solidifi\u00e9 final, ainsi qu'une baisse du rendement de fabrication et une perte de performances du produit fini. Par exemple, parmi les d\u00e9fauts de finition particuli\u00e8rement importants dans les bandes ou t\u00f4les d\u00e9coratives en alliage d'aluminium 5252, on trouve un d\u00e9faut de nature plus fine appel\u00e9 \u00ab d\u00e9faut lin\u00e9aire \u00bb.<\/p>\n<p>Les proc\u00e9d\u00e9s de traitement de la masse fondue rigoureux (tels que la fusion sous flux gazeux) r\u00e9duisent au minimum l\u2019apparition de ces d\u00e9fauts. Cependant, ces m\u00e9thodes ne permettent pas de les ramener \u00e0 un niveau satisfaisant pour les applications critiques. Classiquement, on recourt \u00e0 la filtration de la masse fondue pour r\u00e9duire l\u2019ampleur de ces d\u00e9fauts et d\u2019autres d\u00e9fauts caus\u00e9s par des inclusions dans la masse fondue. La forme la plus courante de filtration de la masse fondue consiste \u00e0 utiliser un tamis en tissu de verre \u00e0 mailles ouvertes, plac\u00e9 dans une cuve de transfert et de coul\u00e9e ou dans un bain de m\u00e9tal en fusion au-dessus d\u2019un lingot solidifi\u00e9. Il a \u00e9t\u00e9 constat\u00e9 que ces filtres ne sont que partiellement efficaces, car ils n\u2019\u00e9liminent que les inclusions de grande taille. Un autre filtre couramment utilis\u00e9 est, par exemple, un filtre \u00e0 lit constitu\u00e9 d\u2019alumine en forme de plaques. Ces filtres pr\u00e9sentent de nombreux inconv\u00e9nients, dont le plus grave est l\u2019\u00e9norme difficult\u00e9 rencontr\u00e9e pour contr\u00f4ler et maintenir la taille des pores n\u00e9cessaire \u00e0 une filtration efficace. Une autre difficult\u00e9 li\u00e9e \u00e0 ces filtres est qu\u2019ils ont tendance \u00e0 produire un m\u00e9tal de mauvaise qualit\u00e9 initiale au d\u00e9but de chaque cycle de coul\u00e9e continue. Ce comportement entra\u00eene ce que l\u2019on appelle \u201c l\u2019effet de jonction \u201d des lingots : les parties de jonction des lingots, de qualit\u00e9 relativement m\u00e9diocre, doivent \u00eatre rejet\u00e9es et recycl\u00e9es. De plus, m\u00eame en l\u2019absence de filtre, le m\u00e9tal pr\u00e9sent dans le filtre \u00e0 lit doit rester en fusion.<\/p>\n<p>C'est pourquoi AdTech a con\u00e7u <a href=\"http:\/\/www.alalloycasting.com\/fr\/ceramic-filter-for-aluminum\/\">filtre en mousse c\u00e9ramique<\/a> et un proc\u00e9d\u00e9 de filtration de l'aluminium fondu destin\u00e9 \u00e0 la coul\u00e9e, particuli\u00e8rement utile pour filtrer le m\u00e9tal en fusion. Un filtre en mousse c\u00e9ramique pr\u00e9sente de nombreux avantages pour la filtration du m\u00e9tal en fusion, notamment de l'aluminium fondu, et peut \u00eatre facilement fabriqu\u00e9 \u00e0 un co\u00fbt raisonnable. Il ne contamine pas la masse fondue et n'entra\u00eene pas de d\u00e9t\u00e9rioration des caract\u00e9ristiques requises du produit m\u00e9tallique final.<\/p>","protected":false},"excerpt":{"rendered":"<p>In fact, molten metal, especially molten aluminum, often contains entrained solids, which are harmful to the final cast metal product. These entrained solids appear as&hellip;<\/p>","protected":false},"author":1,"featured_media":6829,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[433,7374,127,7367,7381,105,1753,429,7382,1743,7379,825,7375,7377,7368,7378,9,7369,7328,7380,487,7373,7383,4683,1441,7372,1729,7347,655,298,7371,7376,7370],"class_list":["post-6823","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-alumina-ceramic-foam-filter","tag-alumina-filter-ceramic-foam","tag-alumina-foam-ceramic-filter","tag-aluminium-filtration","tag-aluminium-foam-ceramic-filter","tag-ceramic-filter-for-foundry","tag-ceramic-filters-for-foundry","tag-ceramic-filtration","tag-ceramic-foam-filter-aluminium","tag-ceramic-foam-filter-canada","tag-ceramic-foam-filter-dubal","tag-ceramic-foam-filter-for-foundry","tag-ceramic-foam-filter-for-sale","tag-ceramic-foam-filter-norway","tag-ceramic-foam-filter-production-process","tag-ceramic-foam-filter-rusal","tag-ceramic-foam-filters","tag-ceramic-foam-filters-for-sale","tag-ceramic-foam-filtration-mechanism","tag-ceramic-foundry-filters-manufacturer","tag-cff-filter","tag-cff-filter-system","tag-cff-filtration","tag-cff-system","tag-foam-ceramic-filter","tag-foam-ceramic-filter-for-sale","tag-foam-ceramic-filters","tag-foam-ceramic-filtration-technology","tag-molten-aluminum-filtration","tag-porous-ceramic-filter","tag-porous-ceramic-filter-for-sale","tag-porous-ceramic-filtration","tag-porous-ceramic-material"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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