Abstract：The powder metallurgy vacuum hot-pressed sintered technology was used to prepare SiC， Si3N4， B4C multivariate ceramics/Cu composite. The thermal conductivity of the composite at room temperature was tested through laser pulse method. Results show that the thermal conductivity of the composite decreases gradually with the content increase of SiC， Si3N4， B4C multivariate ceramics， especially when the mass percent of the ceramic is more than 15.0%. Pores， grain boundary， lattice distortion， dislocation and other defects are the main factors that affect the thermal conductivity of the composite. To obtain composite materials with good thermal conductivity， the mass percent of multivariate ceramics particles should be controlled below 15.0%. Moreover， annealing or two times extrusion can be used to improve the density and reduce internal defects of the composite， thus increase the thermal conductivity.
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2017, Vol. 27 
