期刊
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
卷 118, 期 1374, 页码 157-160出版社
CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI
DOI: 10.2109/jcersj2.118.157
关键词
Cubic boron nitride; Mullite; Spark plasma sintering; Densification; Phase transformation
资金
- Asian CORE Program
- Global COE Program
- MEXT, Japan
- New Energy and Industrial Technology Development Organization
- Mitsubishi Materials Corporation
- [18860009]
Mullite-cubic boron nitride (cBN) composites were prepared using mullite and cBN powders by spark plasma sintering at temperatures of 1500-1700 degrees C for a holding time of 600 s under a pressure of 400 MPa. Densification, microstructure and hardness of the mullite-BN composites and the phase transformation of cBN to hexagonal BN (hBN) in the mullite-BN composites were studied. Fully dense mullite-cBN composites originally containing 10-30 vol% cBN with relative density of over 95% were obtained at 1500 degrees C without the phase transformation of cBN. At the cBN content of 10 vol%, the densification of the mullite-BN composite was not inhibited. When more than 20 vol% cBN was added to mullite, the densification of the mullite-BN composites was suppressed. The phase transformation of cBN in the mullite-BN composites started at 1600-1700 degrees C. The hardness of mullite-BN composites originally containing 20 vol% cBN sintered at 1500 degrees C without the phase transformation of cBN reached a maximum value of 16 GPa. (C) 2010 The Ceramic Society of Japan. All rights reserved.
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