{"id":1212,"date":"2020-04-17T09:14:28","date_gmt":"2020-04-17T09:14:28","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=1212"},"modified":"2020-08-28T06:45:33","modified_gmt":"2020-08-28T06:45:33","slug":"alumina-foam-ceramics","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/alumina-foam-ceramics\/","title":{"rendered":"Cer\u00e2micas de espuma de alumina"},"content":{"rendered":"

A cer\u00e2mica de espuma de alumina \u00e9 um importante ramo dos tr\u00eas tipos de cer\u00e2mica de espuma (alumina, carboneto de sil\u00edcio e zirc\u00f4nia), sendo tamb\u00e9m o tipo mais antigo de cer\u00e2mica de espuma. \u00c9 amplamente utilizada na ind\u00fastria de fundi\u00e7\u00e3o de alum\u00ednio e ligas. Atualmente, com o aprimoramento cont\u00ednuo dos requisitos de desempenho dos produtos de alum\u00ednio e ligas de alum\u00ednio, novos requisitos t\u00eam sido continuamente estabelecidos para filtragem de alum\u00ednio l\u00edquido<\/a>, o que exige caracter\u00edsticas de fundi\u00e7\u00e3o como alta pureza, menor forma\u00e7\u00e3o de esc\u00f3ria e vaz\u00e3o uniforme do alum\u00ednio l\u00edquido para que a fundi\u00e7\u00e3o seja bem-sucedida. Os produtos de alum\u00ednio apresentam melhores propriedades f\u00edsicas e qu\u00edmicas, al\u00e9m de melhor desempenho na usinagem, de modo a atender a condi\u00e7\u00f5es de uso mais rigorosas e alcan\u00e7ar o objetivo de prolongar a vida \u00fatil desses produtos.<\/p>\n

Produ\u00e7\u00e3o de cer\u00e2micas de espuma de alumina<\/h2>\n

Todos os processos tecnol\u00f3gicos envolvidos na produ\u00e7\u00e3o de cer\u00e2micas espumadas t\u00eam impacto na qualidade dos produtos cer\u00e2micos espumados, sendo que os principais ingredientes do processo \u2014 o processamento da esponja e a sinteriza\u00e7\u00e3o \u2014 s\u00e3o os que mais influenciam a qualidade do produto. O processo de pulveriza\u00e7\u00e3o afeta principalmente a qualidade e a apar\u00eancia do produto e, ao mesmo tempo, tamb\u00e9m exerce certa influ\u00eancia sobre a qualidade interna.<\/p>\n

Tamanho da pasta<\/strong><\/p>\n

O tamanho das part\u00edculas da pasta determina a dispers\u00e3o da pasta pulverizada. Quanto mais finas forem as part\u00edculas da pasta, melhor ser\u00e1 a dispers\u00e3o da pasta pulverizada e mais uniforme ser\u00e1 a aplica\u00e7\u00e3o da pasta sobre o corpo verde. Ao mesmo tempo, quanto menor for o tamanho das part\u00edculas da pasta, menor ser\u00e1 o desgaste do bico. O tamanho das part\u00edculas da pasta tamb\u00e9m determina as condi\u00e7\u00f5es de sinteriza\u00e7\u00e3o da superf\u00edcie do produto. Em geral, utiliza-se uma pasta com res\u00edduo na peneira de malha 400 inferior a 0,5% como pasta de pulveriza\u00e7\u00e3o para placas filtrantes de cer\u00e2mica espumada, e a temperatura de sinteriza\u00e7\u00e3o da f\u00f3rmula \u00e9 inferior \u00e0 temperatura de sinteriza\u00e7\u00e3o do corpo verde.<\/p>\n

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

Teor de umidade da pasta<\/strong><\/p>\n

O teor de umidade da pasta \u00e9 um fator direto que determina a consist\u00eancia da pasta, o que afeta diretamente a qualidade do efeito de pulveriza\u00e7\u00e3o. Para o processo de pulveriza\u00e7\u00e3o ap\u00f3s o dimensionamento, o teor de \u00e1gua da pasta n\u00e3o pode ser muito baixo. Caso contr\u00e1rio, surgir\u00e3o orif\u00edcios cegos ap\u00f3s a pulveriza\u00e7\u00e3o, e o efeito da pulveriza\u00e7\u00e3o n\u00e3o ser\u00e1 bom. O teor de \u00e1gua da pasta \u00e9 geralmente controlado entre 35% e 40%. Para o processo de pulveriza\u00e7\u00e3o ap\u00f3s a secagem, a superf\u00edcie do corpo verde est\u00e1 seca e dura, e apresenta um grande efeito de adsor\u00e7\u00e3o sobre a pasta de pulveriza\u00e7\u00e3o com alta consist\u00eancia. Portanto, o teor de \u00e1gua da pasta pulverizada deve ser mantido mais baixo, o que melhora o efeito da pulveriza\u00e7\u00e3o na superf\u00edcie. O teor de \u00e1gua da pasta pulverizada \u00e9 geralmente controlado entre 25% e 35%. Quando o teor de \u00e1gua da pasta pulverizada \u00e9 baixo, \u00e9 necess\u00e1rio selecionar um compressor de ar com press\u00e3o mais alta e um bico de di\u00e2metro maior para obter um bom efeito de pulveriza\u00e7\u00e3o.<\/p>\n

Volume de pulveriza\u00e7\u00e3o de lama<\/strong><\/p>\n

A quantidade de pasta pulverizada \u00e9 um indicador importante para avaliar se o efeito da pulveriza\u00e7\u00e3o \u00e9 ideal e tamb\u00e9m um fator importante para determinar se a pulveriza\u00e7\u00e3o de cada pe\u00e7a em bruto \u00e9 uniforme. Por isso, muitas empresas utilizam esse indicador e definem par\u00e2metros espec\u00edficos para diferentes especifica\u00e7\u00f5es de placas de filtro, a fim de garantir que a pulveriza\u00e7\u00e3o do produto atenda aos requisitos do processo e alcance o efeito de pulveriza\u00e7\u00e3o especificado.<\/p>\n

Para placas de filtragem<\/a> Dependendo dos diferentes tamanhos, a quantidade de pasta pulverizada varia. \u00c9 claro que, para pastas com diferentes teores de \u00e1gua, a quantidade pulverizada tamb\u00e9m varia. O tamanho das part\u00edculas, o teor de \u00e1gua e o volume pulverizado da pasta pulverizada desempenham, todos, um papel importante no efeito da pulveriza\u00e7\u00e3o. Entre eles, o tamanho das part\u00edculas da pasta determina a dispers\u00e3o e a uniformidade da pulveriza\u00e7\u00e3o, bem como a sinteriza\u00e7\u00e3o final da superf\u00edcie; o teor de umidade da pasta afeta a consist\u00eancia da pasta; a consist\u00eancia da pasta determina o efeito do espessamento da linha de rede na superf\u00edcie da pe\u00e7a em bruto; a quantidade pulverizada \u00e9 um par\u00e2metro importante para avaliar se a pulveriza\u00e7\u00e3o atende aos requisitos tecnol\u00f3gicos.<\/p>","protected":false},"excerpt":{"rendered":"

Alumina foam ceramics is an important branch of three types of foam ceramics (alumina, silicon carbide, zirconia), and it is also the earliest type of…<\/p>","protected":false},"author":1,"featured_media":4277,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,138],"tags":[1595,127,128,485,1455,1454,1451,104,432,1440,486,1447,427,1439,426,219,9,425,1456,422,1597,1441,165,418,1448,1453,417,416,1444,412,1452,298,1446,1596,406,1594,405],"class_list":["post-1212","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ceramic-foam-filter","category-seo","tag-alumina-filter","tag-alumina-foam-ceramic-filter","tag-alumina-foam-ceramics","tag-aluminum-casting-filter","tag-asian-foundry-filters","tag-casting-filter","tag-ceramic-disc-filter","tag-ceramic-filter","tag-ceramic-filter-foundry","tag-ceramic-filter-malaysia","tag-ceramic-filter-manufacturers","tag-ceramic-foam-filter-china","tag-ceramic-foam-filter-manufacturers","tag-ceramic-foam-filter-manufacturers-in-india","tag-ceramic-foam-filter-manufacturing-process","tag-ceramic-foam-filter-suppliers","tag-ceramic-foam-filters","tag-ceramic-foam-filters-for-casting","tag-ceramic-foundry-filter","tag-filter-foam-manufacturers","tag-filter-foundry","tag-foam-ceramic-filter","tag-foam-filter-manufacturers","tag-foundry-ceramic-filters","tag-foundry-coatings","tag-foundry-filter","tag-foundry-filters","tag-honeycomb-ceramic-filter","tag-lanik-ceramic-foam-filters","tag-metal-foam-filter","tag-molten-metal-filtration","tag-porous-ceramic-filter","tag-porous-filter-material","tag-silicon-carbide-ceramic-filter","tag-silicon-carbide-ceramic-foam-filter","tag-silicon-carbide-filter","tag-silicon-carbide-foam-filter"],"yoast_head":"\nAlumina Foam Ceramics Filter - sales@alalloycasting.com\/<\/title>\n<meta name=\"description\" content=\"Alumina foam ceramics is an important branch of three types of foam ceramics. 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