In Situ Reaction Strengthening and Toughening of B4C/TiSi2 Ceramics

被引：0
作者：
Xia, Tao [2 ]
Tu, Xiaoshi [2 ]
Zhang, Fan [1 ,2 ]
Zhang, Jinyong [2 ]
Ren, Lin [3 ]
机构：
[1] Wuhan Univ Technol, Hubei Longzhong Lab, Xiangyang Demonstrat Zone, Xiangyang 441000, Peoples R China
[2] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China
[3] Wuhan Univ Technol, Sch Sci, Wuhan 430070, Peoples R China
来源：
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION | 2023年 / 38卷 / 01期
基金：
中国国家自然科学基金;
关键词：
in situ reaction; hot pressing sintering; TiSi2; B4C composite ceramics; reaction mechanism; MECHANICAL-PROPERTIES; B4C-TIB2-SIC COMPOSITES; TITANIUM DIBORIDE; MICROSTRUCTURE; B4C; DENSIFICATION; CARBIDE; FINE;
D O I：
10.1007/s11595-023-2662-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
B4C-SiC-TiB2 ceramics were prepared by in situ reactive hot-pressing sintering with TiSi2 as an additive. The reaction pathways of TiSi2 and B4C were investigated. The sintering was found to be a multi-step process. The reaction started at approximately 1 000 degrees C, and TiB2 was formed first. Part of Si and C started to react at 1 300 degrees C, and the unreacted Si melted at 1 400 degrees C to form a liquid phase. TiSi2 predominantly affected the intermediate sintering process of B4C and increased the sintering rate. Due to the unique reaction process of TiSi2 and B4C, a large number of aggregates composed of SiC and TiB2 were generated. The results showed that composite ceramics with the optimal flexural strength of 807 MPa, fracture toughness of 3.2 MPa center dot m(1/2), and hardness of 32 GPa, were obtained when the TiSi2 content was 10 wt%.
引用
收藏
页码：12 / 19
页数：8
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