摘要
B_(4)C-SiC-TiB_(2)ceramics were prepared by in situ reactive hot-pressing sintering with TiSi_(2)as an additive.The reaction pathways of TiSi_(2)and B_(4)C were investigated.The sintering was found to be a multistep process.The reaction started at approximately 1000℃,and TiB_(2)was formed first.Part of Si and C started to react at 1300℃,and the unreacted Si melted at 1400℃to form a liquid phase.TiSi_(2)predominantly affected the intermediate sintering process of B_(4)C and increased the sintering rate.Due to the unique reaction process of TiSi_(2)and B_(4)C,a large number of aggregates composed of SiC and TiB_(2)were generated.The results showed that composite ceramics with the optimal flexural strength of 807 MPa,fracture toughness of 3.2 MPa·m1/2,and hardness of 32 GPa,were obtained when the TiSi_(2)content was 10 wt%.
作者
夏涛
涂晓诗
张帆
ZHANG Jinyong
REN Lin
XIA Tao;TU Xiaoshi;ZHANG Fan;ZHANG Jinyong;REN Lin(Hubei Longzhong Laboratory,Wuhan University of Technology,Xiangyang Demonstration Zone,Xiangyang 441000,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;School of Science,Wuhan University of Technology,Wuhan 430070,China)
基金
Funded by the National Natural Science Foundation of China(No.52002299)。
