Spark plasma sintering of βSiAlON-cBN composite

被引：14
|
作者：
Hotta, Mikinori [1 ]
Goto, Takashi [1 ]
机构：
[1] Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
来源：
PRICM 6: SIXTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-3 | 2007年 / 561-565卷
关键词：
SiAlON; cubic boron nitride; spark plasma sintering; densification; phase transformation; hardness;
D O I：
10.4028/www.scientific.net/MSF.561-565.599
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
beta SiAlON-cubic boron nitride (cBN) composites were prepared from beta-SiAlON and cBN powders using spark plasma sintering (SPS) at firing temperature of 1600-1900 degrees C under pressure of 100MPa, and densification, phase transformation and hardness of the composites were investigated. The phase transformation of cBN to hexagonal BN (hBN) was inhibited in beta SiAlON-cBN composite. beta SiAlON-cBN composites containing 10-30 vol% cBN fired at 1650 degrees C were densified to 95-98% of theoretical density with no transformation of cBN to hBN. Vickers hardness of the beta SiAlON-cBN composite containing 20 vol% cBN fired at 1650 degrees C was 17.5 GPa in maximum value, and the hardness significantly decreased as cBN phase was transformed to hBN in the composites.
引用
收藏
页码：599 / 602
页数：4
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