Study on the fracture behavior and toughening mechanism of Si3N4/SiC(n)/SiC(w) nanocomposites

被引：0

作者：

Dong, LM ^{[1
]}

Wang, C ^{[1
]}

Tian, JM ^{[1
]}

机构：

[1] Tsing Hua Univ, Inst Nucl Energy Technol, Beijing 102201, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2003年 / 32卷

关键词：

SiC particles; SiC whiskers; reinforced;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The methods for synergistically reinforcing Si3N4 by using SiC nanoparticles and SiC whiskers are adopted to improve strength and fracture toughness of Si3N4, and the origin and propagating path of cracks under stresses are investigated. By indentation method and in-situ observation with scanning electron microscope. The result shows that the fracture properties of Si3N4/ SiC(n)/SiC(w) nanocomposites is mainly cracking along whiskers accompanied by a few cracking through whiskers. cracks deflect, twist, diverse, stop during their propagating when meeting particles, which control expanding of main cracks, expend the energy of main cracks and act functions of strengthening and toughening. The reinforced mechanism of SiC particles is mainly strengthening grain boundary, reducing grain size and making cracks deflecting and stopping. The reinforced mechanism of SiC whiskers is whisker bridging, pulling-out, and crack deflecting.

引用

页码：196 / 198

页数：3

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