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-Zhou1, 2, 3, 4, WANG Chao1, 2, 3, 4, XUE Xiang-Xin1, 2, 3, 4, YANG He1, 2, 3, 4   

  1. (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 Online:2014-05-20 Published:2014-04-24
  • Contact: XUE Xiang-Xin. E-mail:xuexx@mail.neu.edu.cn
  • 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: 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