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  

作　　者：Shiyi Wen Yong Du Jing Tan Yuling Liu Peng Zhou Jianzhan Long George Kaptay 

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China [2]Hunan Provincial Key Defense Laboratory of High Temperature Wear-Resisting Materials and Preparation Technology,Hunan University of Science and Technology,Xiangtan 411201,China [3]State Key Laboratory of Cemented Carbide,Zhuzhou 412000,China [4]University of Miskolc,Miskolc,Egyetemváros,3515,Hungary

出　　处：《Journal of Materials Science & Technology》2022年第2期123-133,共11页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52031017);the National Key R&D Program of China(No.2019YFC1904901);the Special Funds for the Construction of Hunan Innovation Province(No.2019GK2052);supported by nano-Ginop Project GINOP-2.3.2-15-2016-00027 in the framework of the Szechenyi 2020 program supported by the European Union。

摘　　要：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 3 D-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 particlereinforced composite materials.

关 键 词：Thermal conductivity WC-CO WC-Ag Modeling Cemented carbides Composite materials 

分 类 号：TB33[一般工业技术—材料科学与工程]