{"id":4914,"date":"2020-09-18T08:48:05","date_gmt":"2020-09-18T08:48:05","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4914"},"modified":"2020-09-19T03:22:46","modified_gmt":"2020-09-19T03:22:46","slug":"20-ppi-ceramic-foam","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/20-ppi-ceramic-foam\/","title":{"rendered":"Mousse c\u00e9ramique 20 PPI"},"content":{"rendered":"<p>Le filtre en mousse c\u00e9ramique \u201c 20 ppi \u201d pr\u00e9sente un effet de rectification tr\u00e8s important, ce qui permet de r\u00e9soudre efficacement le probl\u00e8me des fissures \u00e0 la surface des pi\u00e8ces moul\u00e9es. Le filtre en mousse c\u00e9ramique \u00e9limine efficacement la plupart des inclusions pr\u00e9sentes dans la masse fondue, ce qui permet de r\u00e9duire les \u00e9carts au niveau de la r\u00e9sistance \u00e0 la traction, de la limite d'\u00e9lasticit\u00e9 et de l'allongement de la pi\u00e8ce, et d'\u00e9viter la forte baisse des propri\u00e9t\u00e9s m\u00e9caniques provoqu\u00e9e par certaines inclusions grossi\u00e8res. Cependant, le \u201c 20 ppi \u201d <a href=\"http:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filter-pal\/\">filtre en mousse c\u00e9ramique<\/a> Il ne permet pas d'\u00e9liminer les inclusions relativement petites ; il ne peut donc pas am\u00e9liorer le niveau global de r\u00e9sistance \u00e0 la traction et de limite d'\u00e9lasticit\u00e9. Cependant, l'\u00e9limination des inclusions grossi\u00e8res individuelles contribue \u00e0 l'am\u00e9lioration des propri\u00e9t\u00e9s m\u00e9caniques du mat\u00e9riau.<\/p>\n<p>La structure des jantes en alliage d'aluminium d\u00e9termine en grande partie la difficult\u00e9 du moulage \u00e0 basse pression. Les fissures observ\u00e9es \u00e0 la surface de la pi\u00e8ce moul\u00e9e s'expliquent par le fait que, pendant le processus de remplissage du moule, l'\u00e9coulement turbulent du m\u00e9tal en fusion entra\u00eene une oxydation secondaire et l'inclusion d'impuret\u00e9s, ce qui provoque l'apparition de fissures \u00e0 la surface de la pi\u00e8ce moul\u00e9e et de pores internes.<\/p>\n<p>Afin d'\u00e9viter l'oxydation secondaire et l'emprisonnement provoqu\u00e9s par l'\u00e9coulement turbulent du m\u00e9tal en fusion, et de r\u00e9duire ainsi les fissures superficielles et les pores internes de la pi\u00e8ce moul\u00e9e qui en r\u00e9sultent, apr\u00e8s avoir test\u00e9 de nombreux types, mod\u00e8les et sp\u00e9cifications de filtres diff\u00e9rents, le choix s'est finalement port\u00e9 sur le filtre en mousse c\u00e9ramique \u201c 20 ppi \u201d fabriqu\u00e9 par AdTech.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4915\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/20PPI-Ceramic-Foam-Filter-1.jpg\" alt=\"Filtre en mousse c\u00e9ramique 20 PPI\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/20PPI-Ceramic-Foam-Filter-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/20PPI-Ceramic-Foam-Filter-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Le mod\u00e8le \u201c 20 ppi \u201d d\u00e9signe une plaque filtrante en c\u00e9ramique alv\u00e9ol\u00e9e pr\u00e9sentant une uniformit\u00e9 des pores comprise entre 17 et 23 trous sur une longueur de 25,4 mm. Le filtre en c\u00e9ramique alv\u00e9ol\u00e9e \u00ab 20 ppi \u00bb est g\u00e9n\u00e9ralement plus efficace pour retenir les impuret\u00e9s dont la taille des particules est sup\u00e9rieure ou \u00e9gale \u00e0 50 \u03bcm. Apr\u00e8s le passage d\u2019une certaine quantit\u00e9 de m\u00e9tal en fusion, un g\u00e2teau de filtration se forme \u00e0 la surface de l\u2019entr\u00e9e du filtre, ce qui r\u00e9duit consid\u00e9rablement le d\u00e9bit du m\u00e9tal en fusion \u00e0 travers le filtre. D\u2019une part, en raison de la diminution du diam\u00e8tre int\u00e9rieur de l\u2019entr\u00e9e, la probabilit\u00e9 d\u2019interception des inclusions de petite taille augmente, tout comme l\u2019efficacit\u00e9 d\u2019\u00e9limination de ces derni\u00e8res ; d\u2019autre part, en raison de la r\u00e9duction de la section transversale du canal d\u2019\u00e9coulement du m\u00e9tal en fusion, le r\u00e9approvisionnement en m\u00e9tal en fusion est bloqu\u00e9, ce qui peut entra\u00eener des d\u00e9fauts de coul\u00e9e tels qu\u2019un retard d\u2019alimentation et un retrait.<\/p>\n<p>L'utilisation du filtre en mousse c\u00e9ramique permet de mettre pleinement en \u00e9vidence son effet rectificateur. Le filet de m\u00e9tal en fusion qui s'\u00e9coule \u00e0 travers le filtre en mousse c\u00e9ramique se fond dans le flux principal de l'\u00e9coulement laminaire. L'\u00e9coulement laminaire du m\u00e9tal en fusion permet un remplissage en douceur, \u00e9vitant ainsi l'oxydation secondaire et le pi\u00e9geage du m\u00e9tal en fusion, et r\u00e9solvant efficacement le probl\u00e8me des fissures \u00e0 la surface de la pi\u00e8ce moul\u00e9e.<\/p>","protected":false},"excerpt":{"rendered":"<p>The &#8220;20 ppi&#8221; ceramic foam filter has a very significant rectification effect, which can effectively solve the casting surface cracks. The ceramic foam filter effectively&hellip;<\/p>","protected":false},"author":1,"featured_media":4916,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[1722,1778,4699,1454,432,1726,4680,4677,1447,4682,653,426,4696,4678,1721,1731,1456,1727,4676,4681,1605,1781,1453,4697,412,1782,4679,4126,1604,4698,1780,1446,1602,406,4701,4700],"class_list":["post-4914","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-alumina-ceramic-filter","tag-alumina-ceramic-foam-filters","tag-buy-ceramic-foam-filter","tag-casting-filter","tag-ceramic-filter-foundry","tag-ceramic-filter-manufacturing-process","tag-ceramic-filter-media-for-aluminum","tag-ceramic-foam-filter-board","tag-ceramic-foam-filter-china","tag-ceramic-foam-filter-for-casting","tag-ceramic-foam-filter-manufacturer","tag-ceramic-foam-filter-manufacturing-process","tag-ceramic-foam-filter-size","tag-ceramic-foam-filters-china","tag-ceramic-foam-filters-for-molten-aluminum","tag-ceramic-foam-filters-supplier","tag-ceramic-foundry-filter","tag-ceramic-foundry-filters","tag-filter-media","tag-foam-ceramic-filters-for-casting","tag-foam-furnace-filter","tag-foam-furnace-filters","tag-foundry-filter","tag-honeycomb-ceramic-filters","tag-metal-foam-filter","tag-metal-foam-filters","tag-molten-aluminum-ceramic-foam-filter","tag-molten-metal-filters","tag-open-cell-foam-filter-material","tag-open-cell-foam-filter-materials","tag-porous-ceramic-filters","tag-porous-filter-material","tag-sic-ceramic-foam-filter","tag-silicon-carbide-ceramic-foam-filter","tag-zirconia-ceramic-filter","tag-zirconia-ceramic-foam-filters"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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