{"id":7348,"date":"2021-01-05T05:18:41","date_gmt":"2021-01-05T05:18:41","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=7348"},"modified":"2022-03-16T01:46:36","modified_gmt":"2022-03-16T01:46:36","slug":"alumina-ceramic-foam-filter-material","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/alumina-ceramic-foam-filter-material\/","title":{"rendered":"Material filtrante de espuma cer\u00e2mica de alumina"},"content":{"rendered":"<p>Para quem est\u00e1 familiarizado com os materiais refrat\u00e1rios utilizados para conter o alum\u00ednio fundido e suas ligas, o uso de part\u00edculas de alumina em material filtrante de espuma cer\u00e2mica parece ser uma escolha \u00f3bvia.<\/p>\n<p>A alumina \u00e9 relativamente inerte quimicamente no alum\u00ednio fundido e em suas ligas comuns, incluindo as ligas de magn\u00e9sio. Tamb\u00e9m \u00e9 amplamente utilizada como material particulado em refrat\u00e1rios para a fus\u00e3o e reten\u00e7\u00e3o de ligas de alum\u00ednio fundidas em fornos. Al\u00e9m disso, antes do desenvolvimento de um filtro de espuma cer\u00e2mica descart\u00e1vel, utilizava-se um filtro de leito de alumina em forma de placa para <a href=\"http:\/\/www.alalloycasting.com\/pt\/molten-aluminum-filtration\/\">filtrar alum\u00ednio fundido<\/a>.<\/p>\n<p>O <a href=\"http:\/\/www.alalloycasting.com\/pt\/deep-bed-filter\/\">filtro de leito<\/a> \u00e9 um grande recipiente de aquecimento que cont\u00e9m part\u00edculas de alumina em forma de escamas n\u00e3o aglutinadas, que podem ser utilizadas para fundi\u00e7\u00f5es repetidas durante dias ou at\u00e9 semanas. Assim como nos filtros de leito e nos refrat\u00e1rios, a exposi\u00e7\u00e3o prolongada do metal fundido a agregados n\u00e3o aglutinados exige o uso de materiais particulados quimicamente inertes, como a alumina.<\/p>\n<p>No entanto, a alumina possui um alto coeficiente de expans\u00e3o t\u00e9rmica linear (8,0\u00d710\u207b\u2076\/\u00b0C) e, devido \u00e0 elevada tens\u00e3o t\u00e9rmica gerada pela combina\u00e7\u00e3o, a forma geral da alumina \u2014 como nos filtros de espuma cer\u00e2mica \u2014 apresenta baixa resist\u00eancia ao choque t\u00e9rmico. As varia\u00e7\u00f5es no gradiente t\u00e9rmico s\u00e3o causadas pelo aquecimento desigual e pelo alto coeficiente de expans\u00e3o t\u00e9rmica. Durante o pr\u00e9-aquecimento e o contato inicial com o metal fundido, o material do filtro de espuma cer\u00e2mica pode sofrer ruptura t\u00e9rmica ou descascar, fazendo com que o material do filtro seja liberado no lingote ou no tarugo na forma de inclus\u00f5es. Al\u00e9m disso, quando o filtro de alumina espumada fica confinado na cuba do filtro durante o pr\u00e9-aquecimento e o uso, pode ser gerada uma alta tens\u00e3o de compress\u00e3o lateral devido \u00e0 alta taxa de expans\u00e3o t\u00e9rmica do filtro, resultando em falha por compress\u00e3o do filtro.<\/p>\n<p>O ortofosfato de alum\u00ednio (Al(H\u2082PO\u2084)\u2083) \u00e9 amplamente utilizado como aglutinante refrat\u00e1rio na ind\u00fastria metal\u00fargica. Apresenta boa resist\u00eancia em estado fresco quando seco a uma temperatura relativamente baixa, baixo encolhimento em estado fresco e tamb\u00e9m boa resist\u00eancia durante o processo de queima subsequente. O ortofosfato de alum\u00ednio \u00e9 relativamente barato, amplamente dispon\u00edvel e requer uma temperatura de queima relativamente baixa (1.100 \u00b0C) para se obter a liga\u00e7\u00e3o final de fosfato de alum\u00ednio (AlPO\u2084). Por essas raz\u00f5es, e devido ao custo relativamente baixo do ortofosfato de alum\u00ednio, esse material \u00e9 amplamente utilizado na fabrica\u00e7\u00e3o de filtros de espuma cer\u00e2mica para a filtragem de alum\u00ednio fundido. No entanto, em muitas ligas de alum\u00ednio dispon\u00edveis no mercado, a liga\u00e7\u00e3o de fosfato de alum\u00ednio resultante reage facilmente com o magn\u00e9sio.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7287\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/12\/Alumina-Ceramic-Foam-Filter-for-Refining-1.jpg\" alt=\"Filtro de espuma cer\u00e2mica de alumina para refino\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Alumina-Ceramic-Foam-Filter-for-Refining-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Alumina-Ceramic-Foam-Filter-for-Refining-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>A AdTech oferece <a href=\"http:\/\/www.alalloycasting.com\/pt\/alumina-ceramic-foam-filter\/\">filtro de espuma cer\u00e2mica de alumina<\/a> para alum\u00ednio fundido. O filtro apresenta alta resist\u00eancia ao choque t\u00e9rmico, alta resist\u00eancia \u00e0 corros\u00e3o, resist\u00eancia mec\u00e2nica suficiente, produ\u00e7\u00e3o econ\u00f4mica, respeito ao meio ambiente e menor densidade em compara\u00e7\u00e3o com a t\u00e9cnica anterior. A pasta de produ\u00e7\u00e3o dos filtros de espuma cer\u00e2mica cont\u00e9m alumina, s\u00edlica, composto de c\u00e1lcio, composto de boro e outros. A espuma de c\u00e9lula aberta \u00e9 impregnada com a pasta para volatilizar e sinterizar o suporte.<\/p>\n<h2>Vantagens do material do filtro de espuma cer\u00e2mica de alumina<\/h2>\n<ul>\n<li>Alta resist\u00eancia ao choque t\u00e9rmico \u2014 durante o pr\u00e9-aquecimento ou o contato com o metal fundido, o material n\u00e3o deve rachar nem descascar. Quando o material de espuma cer\u00e2mica \u00e9 instalado no <a href=\"http:\/\/www.alalloycasting.com\/pt\/cff-filter-box\/\">cuba do filtro<\/a>, deve apresentar um baixo coeficiente de expans\u00e3o t\u00e9rmica para minimizar a tens\u00e3o de compress\u00e3o lateral.<\/li>\n<li>Resist\u00eancia \u00e0 corros\u00e3o: O material do filtro de espuma cer\u00e2mica de alumina n\u00e3o deve reagir significativamente na faixa de aplica\u00e7\u00e3o prevista (tempo, temperatura, teor de liga) e deve manter a molhabilidade do alum\u00ednio fundido e de suas ligas comuns.<\/li>\n<li>Resist\u00eancia \u00e0 flex\u00e3o e \u00e0 compress\u00e3o suficiente.<\/li>\n<li>Economia da produ\u00e7\u00e3o.<\/li>\n<li>Baixa densidade e peso leve, f\u00e1cil de operar.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>For those familiar with the refractory materials used to contain molten aluminum and its alloys, the use of alumina particles in ceramic foam filter material&hellip;<\/p>","protected":false},"author":1,"featured_media":7349,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7348","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Alumina Ceramic Foam Filter Material for Molten Aluminum<\/title>\n<meta name=\"description\" content=\"The alumina ceramic foam filter material is also widely used as a particulate material in refractories for holding molten 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\/alumina-ceramic-foam-filter-material\/\" \/>\n<meta property=\"og:locale\" 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