Microstructure,Mechanical,and Thermal Properties of B4C-TiB2-SiC Composites Prepared by Reactive Hot-pressing  

作　　者：CAO Yaoqin HE Qianglong WANG Weimin CAO Yaoqin;何强龙;王为民(China Helicopter Research and Development Institute,Tianjin 300450,China;The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]China Helicopter Research and Development Institute,Tianjin 300450,China [2]The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第6期1031-1037,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Key Research and Development Plan of China(2017YFB0310400);the National Natural Science Foundation of China(5167020705)。

摘　　要：B4C-TiB2-SiC composites with excellent properties were prepared by reactive hot-pressing using B4C,TiC,and Si powders as the raw materials.The phase transition process was investigated by heating the powder mixture to different temperatures and combined with XRD tests.TiB2 and SiC phases were synthesized through an in situ reaction,and the mechanical and thermal properties were improved simultaneously.Microstructure and mechanical properties were also studied,and the 60wt% B4C-21.6wt% TiB2-18.4wt% SiC composite showed a relative density of 99.1%,Vickers hardness of 34.6 GPa,flexural strength of 582 MPa,and fracture toughness of 5.08 MPa·m1/2.In addition,the values of thermal conductivity and thermal expansion coefficient were investigated,respectively.

关 键 词：B4C-TiB2-SiC reactive hot pressing MICROSTRUCTURES mechanical properties thermal properties 

分 类 号：TB332[一般工业技术—材料科学与工程]