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Modificação da liga Al-Si por via não convencional
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ISBN10: 6208639670
ISBN13: 9786208639679
Publisher: Edicoes Nosso Conhecimento
Published: Feb 9 2025
Pages: 84
Weight: 0.27
Height: 0.20 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786208639679
Publisher: Edicoes Nosso Conhecimento
Published: Feb 9 2025
Pages: 84
Weight: 0.27
Height: 0.20 Width: 6.00 Depth: 9.00
Language: Portuguese
As ligas hipereutécticas Al-Si têm aplicação em pequenos motores, pistões para compressores de ar condicionado e outros componentes da transmissão automática. São leves e têm uma excelente resistência ao desgaste, um coeficiente de expansão térmica mais baixo e muito boas caraterÃsticas de fundição. A utilização destas ligas é limitada devido à presença de uma fase primária de silÃcio extremamente dura que reduz a sua maquinabilidade. O presente trabalho tenta melhorar as propriedades mecânicas das ligas hipereutécticas Al-17Si através da modificação do silÃcio primário e do silÃcio eutéctico por via não convencional. As ligas são modificadas através da adição de óxidos e cloretos. Investiga-se o efeito dos óxidos e dos cloretos na morfologia e no tamanho das fases de Si nas ligas hipereutécticas Al-Si. Observou-se que as propriedades mecânicas como a dureza, a resistência à tração e a % de alongamento aumentam nas ligas modificadas. As propriedades melhoradas dependem da distribuição uniforme de finas partÃculas fibrosas eutécticas de Al-silÃcio e de finas partÃculas primárias de Si. Os resultados do trabalho devem ser úteis para investigadores académicos e outros interessados em informações úteis sobre ligas Al-Si.
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