{"id":3200,"date":"2020-07-30T13:53:41","date_gmt":"2020-07-30T13:53:41","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3200"},"modified":"2020-08-18T06:05:01","modified_gmt":"2020-08-18T06:05:01","slug":"ceramic-foam-filters-for-casting","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filters-for-casting\/","title":{"rendered":"Filtres en mousse c\u00e9ramique pour la fonderie"},"content":{"rendered":"<p>Les filtres en mousse c\u00e9ramique destin\u00e9s \u00e0 la coul\u00e9e et aux fondants sont utilis\u00e9s par la plupart des fonderies d'aluminium pour \u00e9liminer les inclusions. L'aluminium liquide r\u00e9agit chimiquement avec l'oxyg\u00e8ne, l'azote, le soufre, le carbone et d'autres \u00e9l\u00e9ments, ce qui g\u00e9n\u00e8re des impuret\u00e9s non m\u00e9talliques. Parmi celles-ci, les inclusions d'oxyde (Al\u2082O\u2083) constituent la source de contamination m\u00e9tallique la plus grave. En g\u00e9n\u00e9ral, la quantit\u00e9 totale d\u2019inclusions d\u2019oxyde dans le lingot est comprise entre 0,002% et 0,02%.<\/p>\n<p><a href=\"http:\/\/www.alalloycasting.com\/fr\/foam-ceramic-filters\/\">Filtres en mousse c\u00e9ramique<\/a> Le proc\u00e9d\u00e9 de coul\u00e9e \u00e9limine les inclusions non m\u00e9talliques pr\u00e9sentes dans la masse fondue d'alliage d'aluminium et fait appel \u00e0 un traitement au fondant en four. La technologie de filtration par mousse c\u00e9ramique \u00e0 l'ext\u00e9rieur du four est depuis longtemps devenue un moyen important de purification de l'aluminium fondu.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3210\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/07\/Ceramic-Foam-Filters-for-Casting.jpg\" alt=\"Filtres en mousse c\u00e9ramique pour la fonderie\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Ceramic-Foam-Filters-for-Casting.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Ceramic-Foam-Filters-for-Casting-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Les sources d'inclusions dans l'alliage d'aluminium sont les suivantes :<\/p>\n<p>(1) L'oxyde form\u00e9 par l'interaction entre la surface de l'alliage d'aluminium et le gaz oxydant pr\u00e9sent dans les gaz du four, tel que l'Al\u2082O\u2083. Ce film d'oxyde permet de prot\u00e9ger l'aluminium liquide contre l'oxydation. Cependant, d\u00e8s que ce film de surface est rompu, il se retrouve enrob\u00e9 d\u2019aluminium fondu. L\u2019Al\u2082O\u2083 ayant un point de fusion \u00e9lev\u00e9 (2 050 degr\u00e9s) et une densit\u00e9 (3,5 \u00e0 4,0) sup\u00e9rieure \u00e0 celle de l\u2019aluminium fondu, il ne flotte pas, ce qui favorise la formation d\u2019inclusions d\u2019oxyde dans la pi\u00e8ce moul\u00e9e.<\/p>\n<p>(2) L'oxyde pr\u00e9sent dans la charge constitue \u00e9galement une source importante d'inclusions d'oxyde dans l'alliage. Par exemple, les lingots d'aluminium et les alliages interm\u00e9diaires contiennent des inclusions telles que l'Al\u2082O\u2083, et la \u00ab rouille \u00bb d'aluminium (Al(OH)\u2083) pr\u00e9sente \u00e0 la surface des lingots d'aluminium peut contaminer directement l'aluminium fondu pendant le processus de fusion.<\/p>\n<p>Par rapport \u00e0 l'aluminium, les \u00e9l\u00e9ments d'alliage tels que le silicium, le zinc, le cuivre, etc., qui pr\u00e9sentent une affinit\u00e9 moindre pour l'oxyg\u00e8ne, ne s'oxydent pas facilement sous la protection du film d'oxyde. M\u00eame si une petite quantit\u00e9 de ces \u00e9l\u00e9ments s'oxyde, l'oxyde ainsi form\u00e9 est dense et ne compromet pas l'int\u00e9grit\u00e9 du film d'oxyde d'aluminium. Par cons\u00e9quent, la fusion des alliages Al-Si, Al-Cu et Al-Zn ne n\u00e9cessite pas l'ajout de <a href=\"http:\/\/www.alalloycasting.com\/fr\/tundish-flux\/\">agents de rev\u00eatement<\/a>.<\/p>\n<p>Dans les alliages d'aluminium, l'\u00e9l\u00e9ment qui pr\u00e9sente une affinit\u00e9 pour l'oxyg\u00e8ne est le magn\u00e9sium. Le magn\u00e9sium est plus l\u00e9ger que l'aluminium et s'oxyde plus facilement que ce dernier. Le MgO form\u00e9 apr\u00e8s oxydation n'est pas dense et d\u00e9truit le film d'oxyde d'aluminium, qui est lui dense. \u00c9tant donn\u00e9 que le magn\u00e9sium d\u00e9truit l'effet protecteur du film d'oxyde d'aluminium, la fusion de l'alliage aluminium-magn\u00e9sium doit \u00eatre effectu\u00e9e dans le respect des consignes relatives au flux.<\/p>","protected":false},"excerpt":{"rendered":"<p>Ceramic Foam Filters for Casting and fluxes are used to remove the inclusions by most aluminum foundries. Liquid aluminum reacts chemically with oxygen, nitrogen, sulfur,&hellip;<\/p>","protected":false},"author":1,"featured_media":3210,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,138],"tags":[1695,1680,1697,1685,1683,1687,1690,222,1698,1699,1694,1691,1684,1682,1686,1696,1688,1692,1693,223,1681,1689,752],"class_list":["post-3200","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ceramic-foam-filter","category-seo","tag-alumina-ceramic-foam-filter-aluminum-casting-industry","tag-alumina-ceramic-foam-filter-for-alumina-alloys","tag-alumina-ceramic-foam-filter-for-casting-metal-purification","tag-alumina-ceramic-foam-filter-for-molten-aluminum-filtration","tag-alumina-ceramic-foam-filter-manufacturers","tag-alumina-ceramic-foam-filter-porous-ceramic-filter","tag-alumina-filter-ceramic-foam-for-precision-casting-filter","tag-aluminium-ceramic-foam-filter-purchasing","tag-aluminum-casting-using-alumina-ceramic-foam-filter","tag-ceralu-ai203-ceramic-foam-filters-for-aluminum","tag-ceramic-foam-filter-cff-a-for-aluminum-casting","tag-ceramic-foam-filter-with-fiber-blanket-sides","tag-china-ceramic-foam-filter-cff","tag-foam-filters-with-gasket","tag-industrial-filters-for-filtration-of-molten-aluminium","tag-molten-metal-cleanliness-when-casting-aluminium","tag-porous-silicon-carbide-ceramic-foam-filter","tag-produce-alumina-ceramic-foam-filters","tag-produce-aluminium-casting-ceramic-foam-filters","tag-sell-ceramic-foam-filters","tag-specifics-of-aluminium-alloys-filtration","tag-square-porous-alumina-ceramic-foam-filter","tag-zirconia-ceramic-foam-filter"],"yoast_head":"<!-- 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