Mechanical properties of Si3N4/BN composites by chemical processing

被引：19
作者：
Kusunose, T [1 ]
Choa, YH [1 ]
Sekino, T [1 ]
Niihara, K [1 ]
机构：
[1] Osaka Univ, ISIR, Ibaraki, Osaka 567, Japan
来源：
SCIENCE OF ENGINEERING CERAMICS II | 1999年 / 2卷
关键词：
urea; boric acid; silicon nitride; boron nitride; thermal shock resistance;
D O I：
10.4028/www.scientific.net/KEM.161-163.475
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The Si3N4/BN nanocomposites containing up to 15vol% hexagonal BN (h-BN) were fabricated by hot-pressing alpha-Si3N4 powders on which turbostratic BN (t-BN) with disordered layer structure was coated partly. The t-BN coating on alpha-Si3N4 particles was prepared by heating alpha-Si3N4 particles covered with a mixture of boric acid and urea in hydrogen gas. TEM observations of this nanocomposite revealed that nano-sized h-BN particles were homogeneously dispersed within Si3N4 grains as well as at grain boundaries. The strength and thermal shock resistance were significantly improved in comparison with the Si3N4/BN microcomposites.
引用
收藏
页码：475 / 479
页数：5
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