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

页码：475 / 479

页数：5

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