{"id":4404,"date":"2020-09-01T08:03:05","date_gmt":"2020-09-01T08:03:05","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4404"},"modified":"2020-09-01T08:03:05","modified_gmt":"2020-09-01T08:03:05","slug":"molten-aluminium-filtration","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-aluminium-filtration\/","title":{"rendered":"Filtration de l'aluminium en fusion"},"content":{"rendered":"<p>La filtration de l'aluminium en fusion rev\u00eat une grande importance pour les fonderies de m\u00e9taux. La plaque filtrante en mousse c\u00e9ramique est largement utilis\u00e9e dans le monde entier en raison de sa praticit\u00e9, de son bon rendement de filtration et de son faible co\u00fbt. La mousse c\u00e9ramique de filtration permet d\u2019\u00e9liminer efficacement les particules fines pr\u00e9sentes dans le bain d\u2019aluminium afin d\u2019atteindre une taille d\u2019inclusion de l\u2019ordre du micron, de conf\u00e9rer au bain d\u2019aluminium un \u00e9coulement laminaire stable et de favoriser le moulage par poin\u00e7onnage. Elle pr\u00e9sente une structure unique \u00e0 base de mullite et de corindon, une bonne r\u00e9sistance m\u00e9canique et une bonne stabilit\u00e9 chimique, ainsi qu\u2019une excellente r\u00e9sistance au lavage par le bain d\u2019aluminium.<\/p>\n<h2>M\u00e9canisme de filtration de l'aluminium en fusion<\/h2>\n<p>Fonctionnement du g\u00e2teau : <a href=\"http:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filter\/\">filtre en mousse c\u00e9ramique<\/a> La structure composite permet une \u00e9limination m\u00e9canique efficace des scories : lorsque le m\u00e9tal en fusion traverse la structure complexe du filtre en c\u00e9ramique alv\u00e9ol\u00e9e, la s\u00e9paration m\u00e9canique op\u00e9r\u00e9e par le milieu filtrant permet de filtrer et de pr\u00e9cipiter les particules dont la taille est sup\u00e9rieure \u00e0 celle des pores du filtre ; le m\u00e9tal en fusion est ainsi achemin\u00e9 vers l'extr\u00e9mit\u00e9, formant ainsi un ensemble de filtres. Les inclusions s\u2019accumulent \u00e0 la surface du filtre et forment progressivement une couche de g\u00e2teau de filtration, ce qui affine encore davantage le flux de m\u00e9tal liquide. L\u2019augmentation de la surface du milieu filtrant permet d\u2019\u00e9liminer davantage de petites inclusions. Parall\u00e8lement, le milieu filtrant exerce \u00e9galement un effet de filtration : dans le corps c\u00e9ramique, le nombre de pores, la pr\u00e9sence de petits interstices ou de zones mortes varient selon les zones ; ces variations constituent les emplacements potentiels o\u00f9 les inclusions sont intercept\u00e9es, ce qui engendre un effet de \u201c g\u00e2teau de filtration \u201d au sein du filtre.<\/p>\n<p>Effet de surface : lorsque la structure du m\u00e9tal liquide s'\u00e9coulant \u00e0 travers le corps en c\u00e9ramique est complexe et se divise en de nombreux courants, la surface de contact et la probabilit\u00e9 de contact entre les inclusions de m\u00e9tal liquide et le milieu filtrant sont accrues, car la surface du filtre pr\u00e9sente de minuscules parties convexes et concaves, la taille des blocs concaves est d\u2019environ 1 \u00e0 10 m\u00e8tres, ce qui permet d\u2019intercepter les inclusions ainsi que l\u2019adsorption \u00e9lectrostatique et l\u2019adh\u00e9rence.<\/p>\n<p>Effet de rectification : le m\u00e9tal liquide s'\u00e9coulant \u00e0 travers le filtre c\u00e9ramique alv\u00e9ol\u00e9 est divis\u00e9 en de nombreux petits flux de diam\u00e8tre r\u00e9duit, ce qui fait diminuer le nombre de Reynolds (Re = VD \/ R) et tend \u00e0 rendre l'\u00e9coulement du liquide laminaire. Lorsque le m\u00e9tal en fusion est en \u00e9coulement laminaire, la densit\u00e9 du m\u00e9tal liquide \u00e9tant bien sup\u00e9rieure \u00e0 celle des inclusions, il faut suffisamment de temps pour \u00e9liminer les inclusions flottantes ; la plaque filtrante en c\u00e9ramique alv\u00e9ol\u00e9e peut alors faciliter l\u2019\u00e9limination des scories. La r\u00e9sistance \u00e0 l\u2019\u00e9coulement du filtre plac\u00e9 dans le syst\u00e8me de coul\u00e9e augmente, et l\u2019\u00e9coulement du m\u00e9tal en fusion g\u00e9n\u00e8re un mouvement suffisant pendant le processus de coul\u00e9e pour r\u00e9duire le d\u00e9bit, ce qui favorise la remont\u00e9e \u00e0 la surface des inclusions et leur r\u00e9tention sur la surface sup\u00e9rieure du canal de coul\u00e9e.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4408\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Molten-Aluminium-Filtration-1-1.jpg\" alt=\"Filtration de l&#039;aluminium en fusion\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Molten-Aluminium-Filtration-1-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Molten-Aluminium-Filtration-1-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h2>Effet de filtration du filtre en mousse c\u00e9ramique<\/h2>\n<p>L'utilisation de <a href=\"http:\/\/www.alalloycasting.com\/fr\/alumina-ceramic-foam-filter\/\">filtre en mousse c\u00e9ramique d'alumine<\/a> La purification des plaques d'aluminium liquide, des bandes et des feuilles d'aluminium, ainsi que de leurs produits d\u00e9riv\u00e9s (tels que les flans pour wagons-citernes, les mat\u00e9riaux d\u00e9coratifs haut de gamme et les plaques en PS) a apport\u00e9 de grands avantages. Les fabricants b\u00e9n\u00e9ficient des avantages \u00e9vidents suivants pour les profil\u00e9s en alliage d'aluminium :<\/p>\n<p>Augmentation du rendement d'extrusion : lorsque la plaque filtrante est utilis\u00e9e pour purifier une billette d'extrusion en alliage 15%, nous recourons \u00e0 un suivi sp\u00e9cifique du moule et constatons que la vitesse d'extrusion augmente de 20% et que le rendement de production s'am\u00e9liore de pr\u00e8s de 6063.<\/p>\n<p>La dur\u00e9e de vie du moule est prolong\u00e9e et les d\u00e9lais de r\u00e9paration sont r\u00e9duits.<\/p>\n<p>R\u00e9duire la pression d'extrusion : lorsque la plaque filtrante est utilis\u00e9e pour purifier l'aluminium liquide, la pression du 6063 est sup\u00e9rieure de 3% \u00e0 celle obtenue sans filtration.<\/p>\n<p>La qualit\u00e9 de surface des profil\u00e9s en aluminium est nettement am\u00e9lior\u00e9e.<\/p>","protected":false},"excerpt":{"rendered":"<p>Molten aluminium filtration is important for metal smelter. The ceramic foam filter plate is widely used all over the world for its convenience, good filtering&hellip;<\/p>","protected":false},"author":1,"featured_media":4407,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,138],"tags":[433,1695,1680,1697,1685,1683,1690,222,1698,1699,1694,1691,1684,1682,1686,1696,298,1688,1692,1693,223,1681,1689,752],"class_list":["post-4404","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ceramic-foam-filter","category-seo","tag-alumina-ceramic-foam-filter","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-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-ceramic-filter","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":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Molten Aluminium Filtration by Ceramic Foam Filter<\/title>\n<meta name=\"description\" content=\"Molten aluminium filtration is important for metal smelter. 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