Comparison in microstructure and mechanical properties of porous Si3N4 ceramics with SiC and Si3N4 coatings

被引：25

作者：

Li, Xiangming ^{[1
]}

Yin, Xiaowei ^{[1
]}

Zhang, Litong ^{[1
]}

Pan, Tianhao ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Natl Key Lab Thermostruct Composite Mat, Xian 710072, Shaanxi, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 527卷 / 1-2期

关键词：

Si3N4; SiC; Porosity; Mechanical properties; Chemical vapor deposition; SILICON-NITRIDE CERAMICS; MATRIX COMPOSITES; FRACTURE-TOUGHNESS; OXIDATION PROTECTION; STRENGTH; ADDITIVES; POROSITY; CARBIDE; YB2O3;

D O I：

10.1016/j.msea.2009.08.053

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Porous Si3N4 ceramic is gaining interest for its wide applications, but the low surface hardness decreases the mechanical erosion resistance, and many surface open pores decrease the moisture resistance seriously. Using chemical vapor deposition (CVD) of Sic and Si3N4, respectively, the surface of porous Si3N4 ceramic was densified. During CVD, the SiC and Si3N4 particulates deposited on the inner and on the outer surface of the porous Si3N4 ceramic leading to an obvious improvement of mechanical properties, especially for surface hardness. As the deposition content of SiC and Si3N4 increased, the mechanical properties of porous Si3N4 ceramic increased gradually with the total porosity decreasing slowly. After CVD, the pore size of porous Si3N4 ceramic decreased obviously, and the inner part of the porous Si3N4 ceramic was still porous. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：103 / 109

页数：7

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