Effect of Titanium Boride on Microstructure and Properties of Boron Carbide by Pressureless Sintering

被引：0
|
作者：
Li Z. [1 ]
Zhang J. [1 ]
Cheng H. [1 ,2 ]
Wang Y. [1 ,2 ]
Zhu Y. [1 ]
An R. [1 ]
机构：
[1] School of Material Science and Engineering, Beijing Institute of Technology, Beijing
[2] National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing Institute of Technology, Beijing
来源：
Cheng, Huanwu (chenghuanwu@bit.edu.cn) | 2020年 / Chinese Ceramic Society卷 / 48期
关键词：
Boron carbide; Multiphase ceramics; Pressureless sintering; Titanium boride; Toughening;
D O I：
10.14062/j.issn.0454-5648.20190308
中图分类号：
学科分类号：
摘要：
B4C-TiB2 multi-phase ceramics were prepared in a pressureless vacuum sintering-furnace at different temperatures with TiB2 added into B4C matrix as a second phase substance, and C and Si as sintering aids. The density, hardness, bending strength and fracture toughness of the samples were determined. The influences of composition ratio of B4C-TiB2 and sintering temperature on the microstructure and mechanical properties of the multiphase ceramics were investigated by X-ray diffraction, energy dispersive spectroscopy and scanning electron microscopy. The toughening mechanism of ceramics was discussed. The results show that the optimum density and comprehensive mechanical properties of the multiphase ceramics (i.e., the relative density of 94.59%, the Rockwell hardness of 87.62, the bending strength of 182MPa, and the fracture toughness of 3.97 MPa•m1/2 can be obtained at a sintering temperature of 2200℃ and TiB2 content of 30%. The TiB2 particles can effectively nail the grain boundary, inhibit the growth of B4C grains and play a role in fine-grain strengthening. The TiB2 and laminated graphite phase hinder the crack growth, thus improving the fracture toughness. © 2020, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.
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页码：356 / 361
页数：5
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