Obtenção e caracterização de ligas de Cu-Ni-Cr de alta condutividade elétrica e alta resistência mecânica

• Autor(a) principal: Carvalhal, Marcelo de Almeida
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do Mackenzie
• Texto Completo: http://dspace.mackenzie.br/handle/10899/24153
• topic: cobre-níquel-cromo; condutividade elétrica; análise estrutural; copper-nickel-chromium; electrical conductivity; structural analysis; CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA

In this work were synthesized several samples of ternary alloys of Cu-Ni-Cr by powder metallurgy. The alloys were submitted to different thermal treatments of sintering and homogeneizing and all of them were metallographic characterized. In various compositions were performed micro hardness and electrical resistance measurements. Samples with the compositions 98,5%Cu-1,0%Ni-0,5%Cr and 97,0%Cu-1,5%Ni-1,5%Cr presented electrical conductivity higher than 70% IACS and high mechanical resistance, which indicates proper thermal treatments for these compositions. From Rietveld Method refinements, a structural and micro structural study was performed for some samples, from which X rays diffraction data were collected with synchrotron and conventional radiation. The average crystallite size determined for samples with the composition 98,5%Cu-1,0%Ni-0,5%Cr was approximately of 100 nm. For these samples the grain size lies between 15 e 25 μm.