J. Mater. Sci. Technol. ›› 2022, Vol. 97: 123-133.DOI: 10.1016/j.jmst.2021.04.036

• Research Article • Previous Articles     Next Articles

A new model for thermal conductivity of “continuous matrix / dispersed and separated 3D-particles” type composite materials and its application to WC-M (M = Co, Ag) systems

Shiyi Wena, Yong Dua,*(), Jing Tana, Yuling Liua, Peng Zhoub, Jianzhan Longc, George Kaptayd,*()   

  1. aState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
    bHunan Provincial Key Defense Laboratory of High Temperature Wear-Resisting Materials and Preparation Technology, Hunan University of Science and Technology, Xiangtan 411201, China
    cState Key Laboratory of Cemented Carbide, Zhuzhou 412000, China
    dUniversity of Miskolc, Miskolc, Egyetemváros, 3515, Hungary
  • Received:2021-02-23 Revised:2021-04-08 Accepted:2021-04-08 Published:2021-06-17 Online:2021-06-17
  • Contact: Yong Du,George Kaptay
  • About author:kaptay@hotmail.com (G. Kaptay).
    * E-mail addresses: yong-du@csu.edu.cn (Y. Du),

Abstract:

In the present work a new thermal conductivity model is developed for two-phase composite materials, which are consisted of a continuous matrix and dispersed 3D-particles separated from each other by the matrix as a function of grain size and volume ratio of the dispersed particles at different temperatures. The model is applied to reproduce experimental thermal conductivity values of cemented carbide systems WC-Co and WC-Ag. Good agreement was found between measured thermal conductivity data originating from both this work and recent literature and the calculated ones only using semi-empirical parameters for the interfacial thermal resistance (ITR) values at WC/Co, WC/Ag and WC/WC interfaces as a function of temperature. Additionally, the temperature and grain size dependence of the thermal conductivity for WC is established for the first time. The model works well for the case when the matrix (Ag) has a higher thermal conductivity compared to that of the WC particles and also for the case when the matrix (Co) has a lower thermal conductivity compared to that of the WC particles. The new model forms a physically sound basis for further development / materials design of cemented carbides and particle-reinforced composite materials.

Key words: Thermal conductivity, WC-Co, WC-Ag, Modeling, Cemented carbides, Composite materials