{"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\/pt\/20-ppi-ceramic-foam\/","title":{"rendered":"Espuma cer\u00e2mica de 20 PPI"},"content":{"rendered":"<p>O filtro de espuma cer\u00e2mica de \u201c20 ppi\u201d possui um efeito de retifica\u00e7\u00e3o muito significativo, capaz de resolver de forma eficaz as rachaduras na superf\u00edcie da pe\u00e7a fundida. O filtro de espuma cer\u00e2mica remove com efic\u00e1cia a maior parte das inclus\u00f5es na massa fundida, de modo que o desvio da resist\u00eancia \u00e0 tra\u00e7\u00e3o, do limite de escoamento e do alongamento da pe\u00e7a tende a ser reduzido, al\u00e9m de evitar a queda acentuada das propriedades mec\u00e2nicas causada por inclus\u00f5es grosseiras isoladas. No entanto, o \u201c20 ppi\u201d <a href=\"http:\/\/www.alalloycasting.com\/pt\/ceramic-foam-filter-pal\/\">filtro de espuma cer\u00e2mica<\/a> n\u00e3o consegue filtrar inclus\u00f5es relativamente pequenas; portanto, n\u00e3o consegue melhorar o n\u00edvel geral da resist\u00eancia \u00e0 tra\u00e7\u00e3o e do limite de escoamento. No entanto, a filtragem de inclus\u00f5es grossas isoladas \u00e9 ben\u00e9fica para a melhoria das propriedades mec\u00e2nicas do material.<\/p>\n<p>A estrutura das rodas de liga de alum\u00ednio determina, em grande parte, a dificuldade da fundi\u00e7\u00e3o por baixa press\u00e3o. A causa das fissuras na superf\u00edcie da pe\u00e7a fundida \u00e9 que, durante o processo de preenchimento do molde, o fluxo turbulento do metal fundido provoca oxida\u00e7\u00e3o secund\u00e1ria e inclus\u00f5es, resultando em fissuras na superf\u00edcie da pe\u00e7a fundida e poros internos.<\/p>\n<p>Com o objetivo de evitar a oxida\u00e7\u00e3o secund\u00e1ria e o aprisionamento causados pelo fluxo turbulento do metal fundido, bem como reduzir as rachaduras na superf\u00edcie da pe\u00e7a fundida e os poros internos decorrentes disso, ap\u00f3s testar diversos tipos, modelos e especifica\u00e7\u00f5es de filtros, foi finalmente selecionado o filtro de espuma cer\u00e2mica \u201c20 ppi\u201d fabricado pela 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=\"Filtro de espuma cer\u00e2mica de 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>20 ppi \u00e9 um modelo que representa uma placa filtrante de cer\u00e2mica espumosa com uniformidade de poros de 17 a 23 orif\u00edcios em qualquer comprimento de 25,4 mm. O filtro de cer\u00e2mica espumosa \u201c20 ppi\u201d costuma ser mais eficaz no bloqueio de inclus\u00f5es com tamanho de part\u00edcula igual ou superior a 50 \u03bcm. Com a passagem de uma determinada quantidade de metal fundido, forma-se um bolo de filtra\u00e7\u00e3o na superf\u00edcie da entrada do filtro e, a partir da\u00ed, a vaz\u00e3o do metal fundido atrav\u00e9s do filtro \u00e9 significativamente reduzida. Por um lado, devido \u00e0 diminui\u00e7\u00e3o do di\u00e2metro interno da entrada, aumenta a probabilidade de intercepta\u00e7\u00e3o de inclus\u00f5es de tamanho de part\u00edcula menor, e a efici\u00eancia de remo\u00e7\u00e3o dessas inclus\u00f5es tamb\u00e9m aumenta; por outro lado, devido \u00e0 redu\u00e7\u00e3o da \u00e1rea transversal do canal de fluxo do metal fundido, o reabastecimento do metal fundido \u00e9 bloqueado, e \u00e9 prov\u00e1vel que ocorram defeitos de fundi\u00e7\u00e3o, como atraso na alimenta\u00e7\u00e3o e retra\u00e7\u00e3o.<\/p>\n<p>Ap\u00f3s a utiliza\u00e7\u00e3o do filtro de espuma cer\u00e2mica, o efeito retificador do filtro de espuma cer\u00e2mica pode ser plenamente demonstrado. O fio de metal fundido que flui atrav\u00e9s do filtro de espuma cer\u00e2mica se funde com a corrente principal do fluxo laminar. O estado de fluxo laminar do metal fundido permite um preenchimento suave, evitando a oxida\u00e7\u00e3o secund\u00e1ria e o aprisionamento do metal fundido, al\u00e9m de resolver de forma eficaz as rachaduras na superf\u00edcie da pe\u00e7a fundida.<\/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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