Preparation of Tungsten Boride Ceramic by Pressureless Sintering

doi:10.3724/SP.J.1077.2014.13411

Journal of Inorganic Materials ›› 2014, Vol. 29 ›› Issue (5): 498-502.DOI: 10.3724/SP.J.1077.2014.13411

• Research Paper • Previous Articles Next Articles

Preparation of Tungsten Boride Ceramic by Pressureless Sintering

CAO Xiao-Zhou^{1, 2, 3, 4}, WANG Chao^{1, 2, 3, 4}, XUE Xiang-Xin^{1, 2, 3, 4}, YANG He^{1, 2, 3, 4}

(1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China; 2. Institute of Metallurgical Resources and Environmental Engineering, Northeastern University, Shenyang 110819, China; 3. Liaoning Key Laboratory of Metallurgical Resource Recycling Science, Shenyang 110819, China; 4. Liaoning Engineering and Technology Research Center of Boron Resources Comprehensive Utilization, Shenyang 110819, China)

Received:2013-08-13 Revised:2013-10-01 Published:2014-05-20 Online:2014-04-24
About author:CAO Xiao-Zhou. E-mail: caoxz@smm.neu.edu.cn
Supported by:
Major Program of National Natural Science Foundation of China (51090384); National Natural Science Foundation of China (51204043); Fundamental Research Funds for the?Central?Universities (N120402003)

Abstract

Abstract: WB₂ ceramic was prepared by a two-step sintering method. Firstly, WB₂ powder was synthesized by solid phase reaction using the mixed boron and tungsten powder as raw materials at high temperature. Secondly, WB₂ ceramic was prepared by pressureless sintering using the above synthesized powder. The effect of boron/tungsten molar ratio on the phase composition of synthesized product, and the effect of temperature on the microstructure and mechanical properties of WB₂ ceramic were investigated. The results showed that phase-pure WB₂ could be obtained with B/W molar ratio of 2.5. The apparent porosity decreased, the relative density increased and the mechanical properties were improved greatly with the increase of sintering temperature. When the sintering temperature was up to 1800℃, the porosity, relative density, flexural strength and Vickers micro-hardness of WB₂ ceramic were 5.2%, 86.0%, 72 MPa and 2088.5 MPa, respectively. The main fracture model of WB₂ ceramic was changed from intergranular fracture to transgranular fracture.

Key words: WB₂ ceramic, pressureless sintering, mechanical properties

CLC Number:

TQ174

CAO Xiao-Zhou, WANG Chao, XUE Xiang-Xin, YANG He. Preparation of Tungsten Boride Ceramic by Pressureless Sintering[J]. Journal of Inorganic Materials, 2014, 29(5): 498-502.

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Preparation of Tungsten Boride Ceramic by Pressureless Sintering

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