{"id":11498,"date":"2021-11-28T06:57:20","date_gmt":"2021-11-28T06:57:20","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=11498"},"modified":"2021-11-28T06:57:20","modified_gmt":"2021-11-28T06:57:20","slug":"inclusions-in-aluminum-alloys","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/inclusions-in-aluminum-alloys\/","title":{"rendered":"Inclus\u00f5es em ligas de alum\u00ednio"},"content":{"rendered":"

As ligas de alum\u00ednio caracterizam-se por seu baixo peso espec\u00edfico, baixo ponto de fus\u00e3o, solubilidade de gases insignificante \u2014 com exce\u00e7\u00e3o do hidrog\u00eanio \u2014, excelente fluidez, boa usinabilidade e boa resist\u00eancia \u00e0 corros\u00e3o. Pe\u00e7as fundidas de qualidade superior s\u00e3o um requisito essencial para componentes estruturais cr\u00edticos utilizados nas ind\u00fastrias automotiva e aeroespacial. A produ\u00e7\u00e3o dessas pe\u00e7as fundidas exige que as inclus\u00f5es e a porosidade nas ligas de alum\u00ednio sejam minimizadas (ou mesmo eliminadas) a fim de eliminar sua influ\u00eancia prejudicial sobre as propriedades mec\u00e2nicas, de modo que essas propriedades sejam ent\u00e3o controladas principalmente pela microestrutura das pe\u00e7as fundidas.<\/p>\n

A presen\u00e7a de inclus\u00f5es n\u00e3o met\u00e1licas duras em ligas de alum\u00ednio pode n\u00e3o apenas prejudicar as propriedades mec\u00e2nicas do produto final, mas tamb\u00e9m causar uma s\u00e9rie de outros problemas de processamento na fundi\u00e7\u00e3o sob press\u00e3o, incluindo:<\/p>\n

Redu\u00e7\u00e3o das propriedades mec\u00e2nicas da pe\u00e7a fundida
\nA resist\u00eancia \u00e0 tra\u00e7\u00e3o e o alongamento s\u00e3o significativamente reduzidos com o aumento do teor de inclus\u00f5es. O metal puro, em geral, \u00e9 caracterizado por elevadas propriedades de tra\u00e7\u00e3o (limite de escoamento, resist\u00eancia \u00e0 tra\u00e7\u00e3o m\u00e1xima e porcentagem de alongamento).<\/p>\n

Baixa usinabilidade e alto desgaste das ferramentas
\nAlgumas das inclus\u00f5es que costumam estar presentes na pe\u00e7a fundida s\u00e3o part\u00edculas cer\u00e2micas fr\u00e1geis e extremamente duras. A dureza de certas inclus\u00f5es pode ser medida na escala de Mohs, em que o diamante tem dureza 10. Quando uma liga fundida \u00e9 purificada por filtra\u00e7\u00e3o antes da fundi\u00e7\u00e3o, a usinabilidade melhora significativamente.<\/p>\n

Perda de fluidez e de propriedades nutritivas
\nAs inclus\u00f5es no metal fundido provocam uma diminui\u00e7\u00e3o da fluidez. A produ\u00e7\u00e3o de metal fundido puro por meio de filtra\u00e7\u00e3o por filtro de espuma cer\u00e2mica<\/a> pode aumentar drasticamente a fluidez, em at\u00e9 30% em temperaturas normais de opera\u00e7\u00e3o.<\/p>\n

Aumento da porosidade dos gases
\nO n\u00edvel de hidrog\u00eanio dissolvido nas ligas de alum\u00ednio fundidas \u00e9 o principal fator respons\u00e1vel pela forma\u00e7\u00e3o de porosidade por g\u00e1s durante a solidifica\u00e7\u00e3o. O limite de solubilidade do hidrog\u00eanio no alum\u00ednio fundido \u00e9 elevado, mas diminui drasticamente \u00e0 medida que o metal se solidifica, levando \u00e0 forma\u00e7\u00e3o de porosidade por g\u00e1s. A porosidade gaseosa ap\u00f3s a solidifica\u00e7\u00e3o depende n\u00e3o apenas do teor de hidrog\u00eanio no metal fundido, mas tamb\u00e9m da pureza do metal. Os \u00f3xidos atuam como locais de nuclea\u00e7\u00e3o de poros, e os hidretos se decomp\u00f5em durante o resfriamento, produzindo hidrog\u00eanio dissolvido.<\/p>\n

Baixa qualidade da superf\u00edcie e falta de estanqueidade \u00e0 press\u00e3o
\nDefeitos em produtos de alum\u00ednio, como poros min\u00fasculos em chapas finas e riscos em placas litogr\u00e1ficas, s\u00e3o geralmente causados por inclus\u00f5es. As inclus\u00f5es, cujo di\u00e2metro efetivo varia de 10 a 20 m, podem, mesmo em concentra\u00e7\u00f5es de poucas partes por milh\u00e3o, ser prejudiciais em produtos de alum\u00ednio laminado.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum alloys are characterized by their low specific weight, low melting point, negligible gas solubility with the exception of hydrogen, excellent flowability, good machinability and…<\/p>","protected":false},"author":1,"featured_media":11499,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[7325,12984],"class_list":["post-11498","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-ceramic-foam-filter-filtration","tag-inclusions-in-aluminum-alloys"],"yoast_head":"\nInclusions in Aluminum Alloys, Ceramic Foam Filter Filtration<\/title>\n<meta name=\"description\" content=\"The presence of hard non-metallic inclusions in aluminum alloys can not only degrade the mechanical properties of the final product,.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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