{"id":4890,"date":"2020-09-18T06:33:07","date_gmt":"2020-09-18T06:33:07","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4890"},"modified":"2020-09-18T06:33:07","modified_gmt":"2020-09-18T06:33:07","slug":"foam-ceramic","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/foam-ceramic\/","title":{"rendered":"Espuma cer\u00e2mica"},"content":{"rendered":"

A espuma cer\u00e2mica de alumina \u00e9 uma cer\u00e2mica espumosa de baixa temperatura, utilizada principalmente para filtrar metais n\u00e3o ferrosos fundidos, como o alum\u00ednio e suas ligas. \u00c9 o maior tipo de cer\u00e2mica espumosa produzida na China. Ao mesmo tempo, como a fundi\u00e7\u00e3o de alum\u00ednio l\u00edquido \u00e9, em sua maioria, um processo de fundi\u00e7\u00e3o em barra, o tamanho da filtro de espuma cer\u00e2mica de alumina<\/a>\u00a0\u00e9 maior do que a da zirc\u00f4nia e do carboneto de sil\u00edcio.<\/p>\n

Como o alum\u00ednio l\u00edquido filtrado possui uma densidade menor, seus requisitos de desempenho, como a resist\u00eancia do filtro de espuma cer\u00e2mica \u2013 PAl<\/a> s\u00e3o relativamente baixos. A pesquisa nacional sobre cer\u00e2mica de espuma de alumina come\u00e7ou cedo, o processo de produ\u00e7\u00e3o est\u00e1 maduro e os requisitos do processo n\u00e3o s\u00e3o muito elevados; a qualidade dos produtos fabricados pelos fabricantes nacionais \u00e9 relativamente est\u00e1vel.<\/p>\n

As principais mat\u00e9rias-primas da cer\u00e2mica de espuma de alumina s\u00e3o a \u03b1-alumina, o caulim, o p\u00f3 de s\u00edlica, o feldspato e o dihidrogenofosfato de alum\u00ednio. O componente de \u03b1-alumina representa mais de 80%, e a densidade da pasta \u00e9 de 2,3 a 2,6 g\/cm\u00b3. Ela \u00e9 mais leve e apresenta requisitos menores quanto \u00e0 elasticidade e resist\u00eancia da espuma de poliuretano.<\/p>\n

\"Espuma<\/p>\n

Por se tratar de uma cer\u00e2mica de espuma para altas temperaturas, a cer\u00e2mica de espuma de zirc\u00f4nia \u00e9 utilizada principalmente na filtragem de metais fundidos a altas temperaturas, como a\u00e7o fundido e ligas de alta temperatura. O consumo total n\u00e3o \u00e9 elevado, e h\u00e1 poucos fabricantes nacionais desse tipo de cer\u00e2mica de espuma, como a AdTech filtro de espuma cer\u00e2mica - PZr<\/a>. As dificuldades t\u00e9cnicas na produ\u00e7\u00e3o de cer\u00e2micas de espuma de zirc\u00f4nia incluem, principalmente, a qualidade do suporte de espuma de poliuretano, o controle da temperatura de sinteriza\u00e7\u00e3o da zirc\u00f4nia e a expans\u00e3o volum\u00e9trica causada pela transforma\u00e7\u00e3o de fase cristalina da zirc\u00f4nia. Entre elas, a temperatura de sinteriza\u00e7\u00e3o da zirc\u00f4nia e a transi\u00e7\u00e3o de fase cristalina da zirc\u00f4nia s\u00e3o problemas t\u00e9cnicos, enquanto a escolha do suporte de espuma de poliuretano \u00e9 um problema relacionado \u00e0 qualidade da mat\u00e9ria-prima.<\/p>\n

A densidade real do p\u00f3 de zirc\u00f4nia \u00e9 de 5,7 g\/cm\u00b3 e sua gravidade espec\u00edfica \u00e9 relativamente elevada. A pasta cer\u00e2mica composta por p\u00f3 de zirc\u00f4nia parcialmente estabilizado e aditivos apresenta caracter\u00edsticas de alta gravidade espec\u00edfica e boa fluidez. No processo de dimensionamento de cer\u00e2mica em espuma, o suporte de esponja de poliuretano deve ter bom desempenho de adsor\u00e7\u00e3o da pasta, boa taxa de perfura\u00e7\u00e3o, malha de esponja espessa e elasticidade. Boa e elevada resist\u00eancia \u00e0 tra\u00e7\u00e3o. A densidade da esponja de poliuretano de c\u00e9lula aberta \u00e9 de apenas 0,03 a 0,05 g\/cm\u00b3, e a pr\u00f3pria esponja n\u00e3o \u00e9 muito el\u00e1stica, sendo dif\u00edcil que sua resist\u00eancia atenda aos requisitos do processo de produ\u00e7\u00e3o de cer\u00e2micas de espuma de zirc\u00f4nia.<\/p>","protected":false},"excerpt":{"rendered":"

Alumina ceramic foam is a low-temperature foam ceramic, which is mainly used for filtering non-ferrous metal melts such as aluminum and aluminum alloy. It is…<\/p>","protected":false},"author":1,"featured_media":4891,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[242],"class_list":["post-4890","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-foam-ceramic"],"yoast_head":"\nFoam Ceramic Filter for Casting of Aluminium Alloys<\/title>\n<meta name=\"description\" content=\"Alumina ceramic foam is a low-temperature foam ceramic, which is mainly used for filtering non-ferrous metal melts such as aluminum.\" \/>\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\/pt\/foam-ceramic\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Foam Ceramic Filter for Casting 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