{"id":6524,"date":"2020-11-18T03:32:20","date_gmt":"2020-11-18T03:32:20","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6524"},"modified":"2020-11-18T03:32:20","modified_gmt":"2020-11-18T03:32:20","slug":"porous-ceramics-application","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/porous-ceramics-application\/","title":{"rendered":"Cer\u00e2micas porosas"},"content":{"rendered":"

Com o avan\u00e7o do processo de fabrica\u00e7\u00e3o, as cer\u00e2micas passaram a apresentar formas mais inovadoras, como as estruturas porosas. Devido ao grande n\u00famero de poros interconectados ou fechados nas cer\u00e2micas porosas, elas apresentam caracter\u00edsticas como baixa densidade volum\u00e9trica, alta \u00e1rea superficial espec\u00edfica e baixa condutividade t\u00e9rmica. Nos \u00faltimos anos, a aplica\u00e7\u00e3o das cer\u00e2micas porosas tem se destacado nas \u00e1reas de prote\u00e7\u00e3o ambiental, fundi\u00e7\u00e3o, qu\u00edmica e em outros campos.<\/p>\n

Aplica\u00e7\u00f5es da cer\u00e2mica porosa<\/strong><\/p>\n

A elevada \u00e1rea superficial espec\u00edfica das cer\u00e2micas porosas confere-lhes boa capacidade de adsor\u00e7\u00e3o e atividade. Como suporte de catalisador, elas podem aumentar a \u00e1rea de contato efetiva e melhorar o efeito catal\u00edtico. Ao mesmo tempo, devido \u00e0 sua excelente resist\u00eancia ao choque t\u00e9rmico e \u00e0 corros\u00e3o, podem ser utilizadas em ambientes extremamente adversos.<\/p>\n

Um excelente suporte de catalisador n\u00e3o deve apenas possuir propriedades qu\u00edmicas est\u00e1veis e ser capaz de resistir \u00e0 corros\u00e3o causada por \u00e1cidos, \u00e1lcalis e outros solventes org\u00e2nicos, mas tamb\u00e9m precisa suportar grandes varia\u00e7\u00f5es de temperatura durante o processo de produ\u00e7\u00e3o sem formar esc\u00f3ria; o mais importante \u00e9 que a \u00e1rea superficial espec\u00edfica seja suficientemente grande. A densidade deve ser a menor poss\u00edvel para reduzir o peso. Se o g\u00e1s puder formar pulsos ao passar, o efeito catal\u00edtico ser\u00e1 melhor.<\/p>\n

Filtragem e Separa\u00e7\u00e3o<\/strong><\/p>\n

A chamada separa\u00e7\u00e3o por filtra\u00e7\u00e3o consiste na separa\u00e7\u00e3o de part\u00edculas s\u00f3lidas suspensas em um l\u00edquido ou g\u00e1s, ou entre dois l\u00edquidos imisc\u00edveis.<\/p>\n

O filtro cer\u00e2mico poroso<\/a> O dispositivo apresenta as caracter\u00edsticas de uma ampla \u00e1rea de filtragem e alta efici\u00eancia de filtragem. Gra\u00e7as \u00e0 sua resist\u00eancia \u00e0 alta temperatura, \u00e0 abras\u00e3o e \u00e0 corros\u00e3o, al\u00e9m de aplica\u00e7\u00f5es convencionais, como tratamento de \u00e1gua e filtragem de g\u00e1s, ele \u00e9 utilizado em alguns setores que envolvem altas temperaturas. Ele tamb\u00e9m pode desempenhar fun\u00e7\u00f5es como a filtragem de metal fundido.<\/p>\n

\"Cer\u00e2micas<\/p>\n

Atualmente, com o aprimoramento dos requisitos de qualidade dos produtos de alum\u00ednio, a aplica\u00e7\u00e3o de filtro de espuma cer\u00e2mica<\/a> O uso de placas tamb\u00e9m tem sido promovido. A porosidade da placa de filtro cer\u00e2mica situa-se entre 80% e 90%, o que permite eliminar efetivamente as inclus\u00f5es finas do tamanho de m\u00edcrons presentes no alum\u00ednio fundido \u2014 algo que o processo convencional n\u00e3o consegue fazer. Ao mesmo tempo, como as inclus\u00f5es finas s\u00e3o filtradas, o n\u00famero efetivo de n\u00facleos cristalinos no alum\u00ednio fundido \u00e9 reduzido. Assim, o alum\u00ednio l\u00edquido nucleia e cresce sob condi\u00e7\u00f5es de super-resfriamento relativamente elevadas, o tempo de solidifica\u00e7\u00e3o \u00e9 reduzido e a estrutura \u00e9 refinada. Al\u00e9m disso, por meio da adsor\u00e7\u00e3o, a placa de filtro cer\u00e2mica tamb\u00e9m pode remover os elementos nocivos (Na, K) do alum\u00ednio l\u00edquido. Quando a liga de alum\u00ednio \u00e9 filtrada, a placa de filtro \u00e9 aquecida e se expande instantaneamente; por isso, \u00e9 necess\u00e1rio que a placa de filtro tenha um baixo coeficiente de expans\u00e3o t\u00e9rmica para garantir que n\u00e3o se rache ao ser aquecida.<\/p>","protected":false},"excerpt":{"rendered":"

With the advancement of the preparation process, ceramics have acquired more novel forms, such as porous structures. Due to the large number of interconnected or…<\/p>","protected":false},"author":1,"featured_media":6525,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6524","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nPorous Ceramics Application | Porous Ceramic Filter<\/title>\n<meta name=\"description\" content=\"Due to the large number of interconnected or closed pores in porous ceramics, it has low volume density, high specific surface area.\" \/>\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\/porous-ceramics-application\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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