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 1.28x10(-7) Omega.m(-1), thermal conductivity 139 W.m(-1).K-1, and lower coefficient of thermal expansion 7.4x10(-6)K(-1). Mo-Cu composites have homogeneous and fine microstructure. The fracture mechanism is ductile fracture.