{"id":10806,"date":"2021-10-23T07:37:16","date_gmt":"2021-10-23T07:37:16","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10806"},"modified":"2021-10-22T07:42:04","modified_gmt":"2021-10-22T07:42:04","slug":"ceramic-foam-filters-for-metal-purification","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filters-for-metal-purification\/","title":{"rendered":"Filtres en mousse c\u00e9ramique pour la purification des m\u00e9taux"},"content":{"rendered":"<p>Les filtres en mousse c\u00e9ramique destin\u00e9s \u00e0 la purification des m\u00e9taux fonctionnent selon deux modes : la filtration par g\u00e2teau, dans laquelle les particules en suspension sont plus grosses que la taille des pores du filtre et se d\u00e9posent \u00e0 l'entr\u00e9e de celui-ci, formant un g\u00e2teau dont l'\u00e9paisseur ne cesse d'augmenter, ce qui constitue un milieu filtrant efficace. La filtration en profondeur, dans laquelle la taille des particules en suspension est inf\u00e9rieure \u00e0 celle des pores du filtre, ce qui leur permet de p\u00e9n\u00e9trer dans le filtre et de s'y d\u00e9poser.<\/p>\n<p>La pr\u00e9sence d'inclusions dans les alliages d'aluminium a des effets n\u00e9fastes sur la qualit\u00e9 et les propri\u00e9t\u00e9s des produits en aluminium \u00e0 bien des \u00e9gards. Cela nuit \u00e0 la r\u00e9sistance \u00e0 la fatigue des alliages d'aluminium sp\u00e9cialement utilis\u00e9s dans les secteurs de l'automobile et de l'a\u00e9ronautique.<\/p>\n<p>La pr\u00e9sence d'inclusions entra\u00eene \u00e9galement des d\u00e9fauts lors de la transformation : des stries longitudinales sur les produits lamin\u00e9s (dans le cas d'inclusions \u00e0 haute duret\u00e9), un d\u00e9collement sur les produits forg\u00e9s et des d\u00e9chirures lors de d\u00e9formations plastiques importantes (extrusion, laminage et moulage).<\/p>\n<p>Dans l'industrie de la conserve, les contraintes relatives \u00e0 la teneur en impuret\u00e9s sont strictes : la concentration en impuret\u00e9s doit \u00eatre inf\u00e9rieure \u00e0 10\u207b\u2074 ppm pour r\u00e9pondre aux exigences des fabricants de conserves.<\/p>\n<p>Dans le cas de l'aluminium liquide, l'\u00e9limination des inclusions rev\u00eat une importance particuli\u00e8re. Bien que des efforts aient \u00e9t\u00e9 d\u00e9ploy\u00e9s pour r\u00e9duire la concentration en inclusions, la forte r\u00e9activit\u00e9 de l'aluminium liquide et la pr\u00e9sence de mat\u00e9riaux r\u00e9fractaires entra\u00eenent in\u00e9vitablement la formation de nouvelles inclusions dans le m\u00e9tal liquide, depuis l'\u00e9tape de traitement de la masse fondue jusqu'\u00e0 la coul\u00e9e des produits semi-finis.<\/p>\n<p>Les filtres en mousse c\u00e9ramique destin\u00e9s \u00e0 la purification des m\u00e9taux servent \u00e0 \u00e9liminer les inclusions pr\u00e9sentes dans la masse d'aluminium en fusion. <a href=\"http:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filters-foundry\/\">Filtres en mousse c\u00e9ramique<\/a> Ils sont largement utilis\u00e9s pour la filtration et la purification des m\u00e9taux en fusion. Ils sont fabriqu\u00e9s \u00e0 partir de mousse de polyur\u00e9thane, puis s\u00e9ch\u00e9s et fritt\u00e9s. Leur porosit\u00e9 atteint 80% \u2013 90%. Le filtre en mousse c\u00e9ramique pr\u00e9sente une structure r\u00e9ticulaire et poss\u00e8de une certaine r\u00e9sistance. Il peut supporter la diff\u00e9rence de pression \u00e0 la surface du m\u00e9tal en fusion ainsi que l\u2019impact du flux m\u00e9tallique, mais il reste fragile et cassant. Gr\u00e2ce \u00e0 la structure pr\u00e9cise du mat\u00e9riau, \u00e0 sa qualit\u00e9 homog\u00e8ne et \u00e0 sa grande surface sp\u00e9cifique, l\u2019efficacit\u00e9 de filtration est tr\u00e8s bonne.<\/p>","protected":false},"excerpt":{"rendered":"<p>Ceramic foam filters for metal purification are filtered in two modes: cake filtration, where suspended particles are larger than the pore size of the filter,&hellip;<\/p>","protected":false},"author":1,"featured_media":10809,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10806","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ceramic Foam Filters for Metal Purification, CFF Filtering<\/title>\n<meta name=\"description\" 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