Properties of B4C-TiB2 ceramics prepared by spark plasma sintering

doi:10.1088/1674-1056/abd7d8

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 m^{1 / 2}. The results indicated that the doping of fine Ti particles into the B₄C matrix increased the conductivity and the fracture toughness of B₄C.

Keywords: boron carbide ceramics conductivity hardness fracture toughness

Received: 07 October 2020
Revised: 25 November 2020
Accepted manuscript online: 04 January 2021

PACS:	81.05.Je	(Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))
	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)

Fund: 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).

Corresponding Authors: ^†Corresponding author. E-mail: zhangzf@zzu.edu.cn ^‡Corresponding author. E-mail: chenlc@zzu.edu.cn ^§Corresponding author. E-mail: xpjia@zzu.edu.cn

Cite this article:

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) Properties of B₄C-TiB₂ ceramics prepared by spark plasma sintering 2021 Chin. Phys. B 30 038105

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Properties of B4C-TiB2 ceramics prepared by spark plasma sintering

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Properties of B₄C-TiB₂ ceramics prepared by spark plasma sintering