{"id":2234,"date":"2020-06-11T06:17:03","date_gmt":"2020-06-11T06:17:03","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2234"},"modified":"2020-09-04T09:05:08","modified_gmt":"2020-09-04T09:05:08","slug":"cff-filtration-mechanism","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/cff-filtration-mechanism\/","title":{"rendered":"M\u00e9canisme de filtration CFF"},"content":{"rendered":"

Avec le d\u00e9veloppement de l'industrie m\u00e9tallurgique, les fonderies d'aluminium accordent de plus en plus d'importance \u00e0 la puret\u00e9 de l'aluminium. La m\u00e9thode de filtration CFF est actuellement la plus r\u00e9pandue et la plus \u00e9conomique au monde. Connaissez-vous le m\u00e9canisme de filtration CFF ? D\u00e9couvrons-le ensemble.<\/p>\n

M\u00e9canisme de filtration CFF<\/h2>\n

Gr\u00e2ce au tamisage, \u00e0 l'interception par diffusion, au frottement, \u00e0 la s\u00e9dimentation et \u00e0 d'autres principes de filtration m\u00e9canique, plaques filtrantes en mousse c\u00e9ramique<\/a> Il permet de retenir les impuret\u00e9s pr\u00e9sentes dans l'aluminium fondu, tandis que l'aluminium fondu pur peut s'\u00e9couler librement \u00e0 travers les pores du filtre. L'efficacit\u00e9 de filtration est proportionnelle \u00e0 la taille des pores du treillis c\u00e9ramique alv\u00e9ol\u00e9. Plus les mailles sont fines, plus la capacit\u00e9 \u00e0 retenir les petites particules est \u00e9lev\u00e9e.<\/p>\n

Effet de la couche de s\u00e9diments ou de la couche de g\u00e2teau de filtration. \u00c0 mesure que les particules se d\u00e9posent dans la masse fondue, les grilles courbes interconnect\u00e9es font office de parois de soutien, ce qui am\u00e9liore la capacit\u00e9 \u00e0 retenir les particules h\u00e9t\u00e9rophasiques.<\/p>\n

\"\"<\/p>\n

La surface rugueuse form\u00e9e par les interstices \u00e0 la surface du corps de l'\u00e9chafaudage augmente la surface d'interface entre le flux d'aluminium liquide et la surface solide en c\u00e9ramique. Cela permet aux particules pr\u00e9sentes dans le flux d'aluminium liquide d'\u00eatre davantage d\u00e9sordonn\u00e9es, ce qui favorise la capture et le d\u00e9p\u00f4t des particules solides.<\/p>\n

En raison des microfissures et des pores minuscules pr\u00e9sents \u00e0 la surface de la structure en treillis, des fluorures pr\u00e9sentant une forte affinit\u00e9 pour des particules telles que l'Al\u2082O\u2083 se sont d\u00e9pos\u00e9s au pr\u00e9alable. Cela permet de favoriser la formation d'une couche de g\u00e2teau de filtration compl\u00e8te et d'exercer une forte force d'adsorption chimique, ce qui renforce la capacit\u00e9 \u00e0 capturer les particules h\u00e9t\u00e9rog\u00e8nes restantes.<\/p>\n

Filtration sur mousse c\u00e9ramique<\/h2>\n

De plus, l\u2019effet du champ de temp\u00e9rature r\u00e9sultant du processus de fusion et du processus de transmission de la structure du m\u00e9tal en fusion entra\u00eenera in\u00e9vitablement une forte concentration du solut\u00e9 de l\u2019alliage au fond du creuset. Le m\u00e9tal en fusion subit un cycle de redistribution \u2014 int\u00e9gration \u2014 redistribution \u2014 int\u00e9gration, ce qui constitue \u00e9galement un bon processus d\u2019alliage. Certaines phases et certains compos\u00e9s m\u00e9talliques \u00e0 haut point de fusion se r\u00e9agr\u00e8gent et croissent, tandis que les phases h\u00e9t\u00e9rog\u00e8nes fines s\u2019agr\u00e8gent et croissent, ce qui favorise la filtration et la capture. Ce ph\u00e9nom\u00e8ne s\u2019explique \u00e9galement par les variations de concentration en H, Al\u2082O\u2083, en phase Fe et en phase Ti avant et apr\u00e8s la filtration. Ce ph\u00e9nom\u00e8ne est particuli\u00e8rement marqu\u00e9 dans le cas d\u2019une filtration en deux \u00e9tapes ou d\u2019une filtration sur plaque \u00e9paisse \u00e0 gradient de pores.<\/p>","protected":false},"excerpt":{"rendered":"

With the development of the metallurgical industry, aluminum foundries pay more and more attention to the purity of aluminum. The CFF filtering method is currently…<\/p>","protected":false},"author":1,"featured_media":4519,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[380,379],"class_list":["post-2234","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-ceramic-foam-filter-for-aluminum-foundry","tag-cff-filtration-mechanism"],"yoast_head":"\nCFF Filtration Mechanism, Ceramic Foam Filter for Aluminum Foundry<\/title>\n<meta name=\"description\" content=\"CFF Filtration Mechanism by ceramic foam filiter is currently the most widely used and most economical filtering method in the world.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/cff-filtration-mechanism\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" 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