无压烧结制备硼化钨陶瓷

doi:10.3724/SP.J.1077.2014.13411

无机材料学报 ›› 2014, Vol. 29 ›› Issue (5): 498-502.DOI: 10.3724/SP.J.1077.2014.13411

无压烧结制备硼化钨陶瓷

曹晓舟^{1, 2, 3, 4}, 王超^{1, 2, 3, 4}, 薛向欣^{1, 2, 3, 4}, 杨合^{1, 2, 3, 4}

(1. 东北大学材料与冶金学院, 沈阳110819; 2. 东北大学冶金资源与生态环境研究所, 沈阳110819; 3. 辽宁省冶金资源循环科学重点实验室, 沈阳 110819; 4. 辽宁省硼资源综合开发利用工程技术研究中心, 沈阳110819)

收稿日期:2013-08-13 修回日期:2013-10-01 出版日期:2014-05-20 网络出版日期:2014-04-24
作者简介:曹晓舟(1979–), 男, 博士, 讲师. E-mail: caoxz@smm.neu.edu.cn
基金资助:
国家自然科学基金重大项目(51090384); 国家自然科学基金(51204043); 中央高校基本科研业务费(N120402003)

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)

摘要/Abstract

摘要： 采用两步法制备硼化钨陶瓷, 首先将硼粉与钨粉按一定比例混合, 在高温下合成硼化钨粉体, 再以此为原料采用冷压和高温烧结制备硼化钨陶瓷。研究硼钨比例对合成粉体物相组成的影响, 以及烧结温度对硼化钨陶瓷微观结构及力学性能的影响。研究结果表明: 硼钨摩尔比为2.5时, 可以得到纯度较高的WB₂粉体。随着烧结温度的升高, WB₂陶瓷的显气孔率减小, 相对密度增加, 材料的抗弯强度与显微硬度明显增大, 当烧结温度达到1800℃时, WB₂陶瓷的开口孔隙率为5.2%, 相对密度86.0%, 抗弯强度72 MPa, 显微硬度2088.5 MPa。WB₂陶瓷的断裂行为也从沿晶断裂转变为穿晶断裂模式。

关键词: WB₂, 无压烧结, 力学性能

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

中图分类号:

TQ174

曹晓舟, 王超, 薛向欣, 杨合. 无压烧结制备硼化钨陶瓷[J]. 无机材料学报, 2014, 29(5): 498-502.

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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无压烧结制备硼化钨陶瓷

Preparation of Tungsten Boride Ceramic by Pressureless Sintering

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