Role of sintering aids in phase transformation, microstructure and mechanical properties of Si3N4/SiC nanocomposites

被引：1

作者：

Yang, JF ^{[1
]}

Ohji, T

Niihara, K

机构：

[1] Japan Sci & Technol Corp JST, Synergy Mat Res Ctr, AIST, Moriyama Ku, Nagoya, Aichi 4638687, Japan

[2] Natl Inst Adv Ind Sci & Technol, Synergy Mat Res Ctr, AIST, Moriyama Ku, Nagoya, Aichi 4638687, Japan

[3] Osaka Univ, ISIR, Ibaraki, Osaka 5670047, Japan

来源：

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN | 2001年 / 109卷 / 11期

关键词：

ceramic nanocomposites; sintering aids; nucleation; phase transformation; grain growth; properties;

D O I：

10.2109/jcersj.109.1275_920

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：

Details of alpha-->beta Si3N4 phase transformation, microstructural development and mechanical properties of SiC reinforced-Si3N4 matrix nanocomposites were investigated. Two sintering aid systems were used: 7.5 mass% MgAl2O4+7.5 mass% ZrO2 (MA-Z) and 10 mass% Y2O3+4 mass% Al2O3 (Y-A). The MA-Z system enhanced alpha-->beta phase transformation at low temperatures (1400-1550 degreesC), which was interpreted to arise from nucleation of beta -Si3N4 upon the SiC addition. This phenomenon was not observed in composites added with the Y-A system. Due to a large number of beta -Si3N4 nuclei, microstructure of Si3N4/SiC nanocomposites added with the MA-Z system exhibited a reduced grain growth and high flexural strength.

引用

页码：920 / 923

页数：4

共 21 条

[1] High-temperature strength and microstructural analysis in Si3/N4/20-vol%-SiC nanocomposites [J].