Equivalent thermal conductivity coefficient of particle dispersion strengthened metal ceramic material

YING Jingxin1, PANG Xuming2, ZHOU Jianqiu1,2, QIAN Lijia1, LIN Shishun1

(1.College of Energy Engineering, Nanjing Tech University, Nanjing 211816, China;
2.School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China)

Abstract: Aiming at the problems of effective thermal conductivity of particle dispersion strengthened metal ceramic composites was difficult to measure, traditional theoretical model was flawed and uncertainty in the modern industrial manufacturing, a new model based on the integral average method and thermal resistance series parallel mtehod were investigated. After the analysis of interfacial thermal resistance, particle properties and porosity on effective thermal conductivity, a general mathematical model to describe the equivalent thermal conductivity of this composite material was established. A new method of the model was presented to predict the thermal conductivity of the composite material. The interface thermal resistance and porosity and particle shape were evaluated as the influences to the composite material coefficient. The results indicate that the effective thermal conductivity of composite materials increases with the volume fraction of filler particles and shape factor, and decreases with the increases of porosity. The experimental data tallies with the calculate value and the correctness of the formula is proved.

Key words: equivalent thermal conductivity; shape factor; interfacial thermal resistance; porosity; composite;