Effects of Nb Element on Mircostructure, Thermal Conductivity and Melting Point of Cu-Ni-Nb Alloy Prepared by Vacuum Arc-Melting

Abstract:

Effects of niobium element adding method and addition content on the microstructure, thermal conductivity and melting point of Cu-Ni-Nb alloys prepared by vacuum non-consumable arc-melting were studied. We found that it is difficult to dissolve high melting point element Nb into Cu-Ni alloy by one-step smelting. However, Nb can be dissolved into Cu-Ni alloy in style of Nb-Ni master alloy by two-steps smelting. New phases Ni₃Nb and Ni₈Nb generate in matrix of Cu-Ni alloy. In addition, the thermal conductivity coefficient of Cu-Ni-Nb alloy increases as increasing the content of Nb, while melting point of that alloy decreases as increasing the content of Nb. Moreover, the thermal conductivity coefficient of Cu-20Ni-3Nb alloy is 43.23W/m•k, while melting point of that alloy is 1146°C. That meets the requirement of pure copper casting process.

• Periodical: Advanced Materials Research (Volumes 941-944)
• Pages: 8-12
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.941-944.8
• Online since: June 2014
• Authors: Bai Ping Lu*, Jun Zhe Zhang, Yu Feng Fang
• Keywords: Cu-Ni-Nb Alloy, Melting Point, Microstructure, Thermal Conductivity, Vacuum Arc-Melting

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