{"id":4894,"date":"2020-09-18T07:06:30","date_gmt":"2020-09-18T07:06:30","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4894"},"modified":"2020-09-18T07:06:30","modified_gmt":"2020-09-18T07:06:30","slug":"ceramic-filter-filtration","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/ceramic-filter-filtration\/","title":{"rendered":"Filtration par filtre c\u00e9ramique"},"content":{"rendered":"<p>Les principaux facteurs d\u00e9terminant l'efficacit\u00e9 de filtration d'un filtre c\u00e9ramique sont la pr\u00e9cision de filtration et le d\u00e9bit de filtration. La pr\u00e9cision de filtration fait r\u00e9f\u00e9rence \u00e0 la taille des plus petites particules solides pr\u00e9sentes dans le fluide que le filtre est capable de retenir. Pour un m\u00eame fluide, plus la taille des pores est petite, plus la pr\u00e9cision de filtration est \u00e9lev\u00e9e, et inversement. Pour les milieux liquides, les particules d\u2019impuret\u00e9s pouvant \u00eatre retenues repr\u00e9sentent environ 1\/15 \u00e0 1\/5 de la taille des pores de l\u2019\u00e9l\u00e9ment filtrant. Pour les milieux gazeux, en raison du mouvement brownien relativement actif, l\u2019effet de capture par diffusion est consid\u00e9rablement renforc\u00e9, et la pr\u00e9cision de filtration est augment\u00e9e en cons\u00e9quence pour atteindre 1\/30 \u00e0 1\/20 de la taille des pores. Le d\u00e9bit de filtration correspond au d\u00e9bit du milieu fluide traversant la c\u00e9ramique poreuse par unit\u00e9 de temps. La viscosit\u00e9 du fluide, la pression de service du fluide et la microporosit\u00e9 de l\u2019\u00e9l\u00e9ment filtrant lui-m\u00eame constituent les principaux facteurs d\u2019influence.<\/p>\n<p>Le <a href=\"http:\/\/www.alalloycasting.com\/fr\/alumina-ceramic-foam-filter\/\">filtre en mousse c\u00e9ramique<\/a>\u00a0s\u00e9pare les inclusions pr\u00e9sentes dans l'alliage de coul\u00e9e liquide gr\u00e2ce aux effets physiques et chimiques exerc\u00e9s sur le m\u00e9tal en fusion, et permet d'obtenir l'efficacit\u00e9 de filtration du filtre c\u00e9ramique pour purifier le m\u00e9tal en fusion. Le m\u00e9canisme de filtration repose principalement sur le m\u00e9canisme du g\u00e2teau de filtration, l'effet de surface et l'effet de rectification.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4896\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Ceramic-Filter-Filtration-2.jpg\" alt=\"Filtration par filtre c\u00e9ramique\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Ceramic-Filter-Filtration-2.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Ceramic-Filter-Filtration-2-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>La structure complexe de la mousse c\u00e9ramique permet de bloquer efficacement les scories par voie m\u00e9canique. Lorsque le m\u00e9tal en fusion traverse le filtre en mousse c\u00e9ramique \u00e0 structure complexe, la s\u00e9paration m\u00e9canique op\u00e9r\u00e9e par le milieu filtrant retient les inclusions plus grosses que les pores de la surface du filtre et les fait pr\u00e9cipiter \u00e0 l\u2019extr\u00e9mit\u00e9 du filtre par laquelle s\u2019\u00e9coule le m\u00e9tal liquide ; elles deviennent alors partie int\u00e9grante du filtre. \u00c0 mesure que le nombre d\u2019inclusions accumul\u00e9es \u00e0 la surface du filtre augmente, une couche de \u201c g\u00e2teau de filtration \u201d se forme progressivement, ce qui r\u00e9tr\u00e9cit encore davantage le canal d\u2019\u00e9coulement du m\u00e9tal en fusion, permettant ainsi \u00e0 la surface du nouveau milieu filtrant de retenir des inclusions plus fines. Parall\u00e8lement, l\u2019int\u00e9rieur du m\u00e9dia exerce \u00e9galement un effet filtrant. Parmi les nombreux petits trous qui traversent le corps en c\u00e9ramique, certains pr\u00e9sentent de minuscules fentes, tandis que d\u2019autres sont en cul-de-sac. Ces diff\u00e9rentes zones de variation constituent des emplacements potentiels pour l\u2019interception des inclusions. Un effet de \u201c g\u00e2teau de filtration \u201d se produit \u00e9galement \u00e0 l\u2019int\u00e9rieur du filtre.<\/p>\n<p>Lorsque le m\u00e9tal en fusion s'\u00e9coule \u00e0 travers le corps en c\u00e9ramique \u00e0 structure complexe, il se divise en de nombreux petits flux, ce qui augmente la surface de contact et la probabilit\u00e9 de contact entre les inclusions pr\u00e9sentes dans le m\u00e9tal en fusion et le milieu filtrant. La surface du filtre \u00e9tant constitu\u00e9e d\u2019innombrables micro-surfaces convexes et concaves, elle permet une adsorption \u00e9lectrostatique et une interception par adh\u00e9rence des inclusions.<\/p>\n<p>Lorsque le m\u00e9tal en fusion s'\u00e9coule \u00e0 travers le filtre en c\u00e9ramique alv\u00e9ol\u00e9e, il se divise en nombreux petits flux de faible diam\u00e8tre, et l'\u00e9coulement tend \u00e0 devenir laminaire. Lorsque le m\u00e9tal en fusion se trouve dans un \u00e9tat d\u2019\u00e9coulement laminaire, la densit\u00e9 du m\u00e9tal en fusion \u00e9tant bien sup\u00e9rieure \u00e0 celle des inclusions, ces derni\u00e8res ont suffisamment de temps pour remonter \u00e0 la surface et \u00eatre \u00e9limin\u00e9es ; en d\u2019autres termes, le filtre en c\u00e9ramique alv\u00e9olaire aide le canal transversal \u00e0 retenir les scories. Une fois le filtre plac\u00e9 dans le syst\u00e8me de coul\u00e9e, la force d\u2019assistance \u00e0 l\u2019\u00e9coulement du m\u00e9tal en fusion est accrue ; le m\u00e9tal en fusion s\u2019\u00e9coulant dans le canal de coul\u00e9e a ainsi tendance \u00e0 adopter un mouvement plus lent, et le d\u00e9bit est r\u00e9duit, ce qui favorise la remont\u00e9e des inclusions \u00e0 la surface du canal de coul\u00e9e et leur r\u00e9tention \u00e0 cet endroit.<\/p>","protected":false},"excerpt":{"rendered":"<p>Ceramic filter filtration efficiency main factors are filtration accuracy and filtration rate. Filtration accuracy refers to the size of the smallest solid particles in the&hellip;<\/p>","protected":false},"author":1,"featured_media":4895,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[4181,1778,4128,1749,1744,1455,1774,1745,1451,4702,1438,1757,1753,21,1743,427,219,1740,425,1741,1742,1747,1729,165,1781,1737,1782,1739,1780,1746],"class_list":["post-4894","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-30-ppi-foam-filter","tag-alumina-ceramic-foam-filters","tag-alumina-foam-ceramic-filters","tag-aluminum-melt-filtering-devices","tag-asian-foundry-filter","tag-asian-foundry-filters","tag-cast-filters","tag-casting-filters-for-molten-aluminum","tag-ceramic-disc-filter","tag-ceramic-filter-filtration","tag-ceramic-filter-suppliers","tag-ceramic-filters","tag-ceramic-filters-for-foundry","tag-ceramic-foam-filter","tag-ceramic-foam-filter-canada","tag-ceramic-foam-filter-manufacturers","tag-ceramic-foam-filter-suppliers","tag-ceramic-foam-filter-with-fiber","tag-ceramic-foam-filters-for-casting","tag-ceramic-foam-filters-producers","tag-ceramic-foam-filters-sizing","tag-deep-bed-filter","tag-foam-ceramic-filters","tag-foam-filter-manufacturers","tag-foam-furnace-filters","tag-foundry-ceramic-foam-filter","tag-metal-foam-filters","tag-molten-metal-ceramic-foam-filter","tag-porous-ceramic-filters","tag-use-of-molten-aluminum-filter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ceramic Filter Filtration of Purifying the Molten Metal<\/title>\n<meta name=\"description\" content=\"Ceramic filter filtration efficiency main factors are filtration accuracy and filtration rate. 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La pr\u00e9cision de filtration fait r\u00e9f\u00e9rence \u00e0 la taille...","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.alalloycasting.com\/fr\/ceramic-filter-filtration\/","og_locale":"fr_FR","og_type":"article","og_title":"Ceramic Filter Filtration of Purifying the Molten Metal","og_description":"Ceramic filter filtration efficiency main factors are filtration accuracy and filtration rate. 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