MATCHING OF PARTICLE SIZES OF WC/Co POWDERS AND SPARK PLASMA SINTERING DENSIFICATION

Acta Metall Sin

2009, Vol. 45

Issue (4): 497-502 DOI:

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MATCHING OF PARTICLE SIZES OF WC/Co POWDERS AND SPARK PLASMA SINTERING DENSIFICATION

ZHAO Shixian; SONG Xiaoyan; WANG Mingsheng; WEI Chongbin; ZHANG Jiuxing; LIU Xuemei

Key Laboratory of Advanced Functional Materials; Ministry of Education; School of Materials Science and Engineering; Beijing University of Technology; Beijing 100124

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ZHAO Shixian SONG Xiaoyan WANG Mingsheng WEI Chongbin ZHANG Jiuxing LIU Xue. MATCHING OF PARTICLE SIZES OF WC/Co POWDERS AND SPARK PLASMA SINTERING DENSIFICATION. Acta Metall Sin, 2009, 45(4): 497-502.

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Abstract

The particle size of raw powders to prepare the cemented carbides plays a significant role not only in the properties of the resultant bulk material, but also in the sintering process. WC/Co composite powders with various size matches were prepared by spark plasma sintering (SPS), and the variations of shrinkage rate, which is an important factor describing SPS process, with the sintering temperature and the relationship between the shrinkage rate and the relative density of the sintered sample were analyzed. The results show that the temperature of shrinkage starting, the temperature corresponding to the peak of the shrinkage rate, and the temperature of full densification are almost the same for different sized WC particles, however, all of the above temperatures reduce with the decrease of the Co particle size. It indicates that the shrinkage process of SPS has a rather very weak relationship with the WC particle size, whereas has a close relationship with the Co particle size. As compared with the conventional sintering methods, the above temperatures and the relative density corresponding to the maximum of the shrinkage rate are all lowered. It implies that in the conventional process, at the stage with the maximum of the shrinkage rate, most of the shrinkage has been accomplished. However, in the SPS process, at the same stage the shrinkage degree is lower. Finally, he secial SPS mechanisms for comosite powders with various size matces were analyzed.

Key words: spark plasma sintering(SPS) WC/Co composite powder shrinkage rate particle size matching

Received: 16 September 2008

ZTFLH:

TG146

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Supported by National Natural Science Foundation of China (No.50671001), Program for New Century Excellent Talents in University (No.NCET–06–0182), the Specialized Research Fund for the Doctoral Program of Higher Education (No.20070005010), and the Program of New Materials and Advanced Techniques of Beijing Science and Technology Commission (No.Z08000003220000)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I4/497

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