中国物理B ›› 2021, Vol. 30 ›› Issue (3): 38105-.doi: 10.1088/1674-1056/abd7d8

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

  

  • 收稿日期:2020-10-07 修回日期:2020-11-25 接受日期:2021-01-04 出版日期:2021-02-22 发布日期:2021-02-22

Properties of B4C-TiB2 ceramics prepared by spark plasma sintering

Jingzhe Fan(范静哲), Weixia Shen(沈维霞), Zhuangfei Zhang(张壮飞)†, Chao Fang(房超), Yuewen Zhang(张跃文), Liangchao Chen(陈良超)‡, Qianqian Wang(王倩倩), Biao Wan(万彪), and Xiaopeng Jia(贾晓鹏)§   

  1. 1 Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China
  • Received:2020-10-07 Revised:2020-11-25 Accepted:2021-01-04 Online:2021-02-22 Published:2021-02-22
  • Contact: †Corresponding author. E-mail: zhangzf@zzu.edu.cn ‡Corresponding author. E-mail: chenlc@zzu.edu.cn §Corresponding author. E-mail: xpjia@zzu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11704340 and 11804305) and the Scientific and Technology Project in Henan Province, China (Grant No. 202102210198).

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Abstract: By doping titanium hydride (TiH2) into boron carbide (B4C), a series of B4C+x wt% TiH2 (x = 0, 5, 10, 15, and 20) composite ceramics were obtained through spark plasma sintering (SPS). The effects of the sintering temperature and the amount of TiH2 additive on the microstructure, mechanical and electrical properties of the sintered B4C-TiB2 composite ceramics were investigated. Powder mixtures of B4C with 0-20 wt% TiH2 were heated from 1400 °C to 1800 °C for 20 min under 50 MPa. The results indicated that higher sintering temperatures contributed to greater ceramic density. With increasing TiH2 content, titanium diboride (TiB2) formed between the TiH2 and B4C matrix. This effectively improved Young's modulus and fracture toughness of the composite ceramics, significantly improving their electrical properties: the electrical conductivity reached 114.9 Scm -1 at 1800 °C when x = 20. Optimum mechanical properties were obtained for the B4C ceramics sintered with 20 wt% TiH2, which had a relative density of 99.9 0.1%, Vickers hardness of 31.8 GPa, and fracture toughness of 8.5 MPa m1 / 2. The results indicated that the doping of fine Ti particles into the B4C matrix increased the conductivity and the fracture toughness of B4C.

Key words: boron carbide ceramics, conductivity, hardness, fracture toughness

中图分类号:  (Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))

  • 81.05.Je
61.72.U- (Doping and impurity implantation) 81.20.Ev (Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation) 81.65.Ps (Polishing, grinding, surface finishing)