Mechanical properties and expansion coefficient of Mo-Cu composites with different Ni contents

Mo-Cu composites were fabricated by powder metallurgy with addition of various Ni contents.The effect of Ni contents on mechanical and thermal properties of Mo-Cu composites was investigated.The results show that mechanical and thermal properties of Mo-Cu composites are greatly affected by the addition of Ni contents.The composite powders with Ni addition exhibits high sinterability.The sintering temperature is greatly decreased and the comprehensive properties of Mo-Cu composites are obviously improved.Mo-Cu composites with a content of 1.5 wt.% Ni have relative density 99.2%,bending strength 1057.9 MPa,hardness 72.5 HRA,electronic resistivity 1.28×10^-7Ω·m^-1,thermal conductivity 139 W.m^-1.K^-1,and lower coefficient of thermal expansion 7.4×10^-6K^-1.Mo-Cu composites have homogeneous and fine microstructure.The fracture mechanism is ductile fracture.