THE LOW-TEMPERATURE HEXAGONAL TO ORTHORHOMBIC TRANSFORMATION IN SI3N4 REINFORCED BAS MATRIX COMPOSITES

被引：25

作者：

BANDYOPADHYAY, A

ASWATH, PB

PORTER, WD

CAVIN, OB

机构：

[1] UNIV TEXAS,MAT SCI & ENGN PROGRAM,ARLINGTON,TX 76019

[2] OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831

来源：

JOURNAL OF MATERIALS RESEARCH | 1995年 / 10卷 / 05期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1557/JMR.1995.1256

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The amount of Si3N4 in a Si3N4-BaO . Al2O3 . 2SiO(2) (BAS) composite and the time of sintering was examined in the context of the low temperature hexagonal to orthorhombic transformation in BAS. It was found that with increasing amounts of Si3N4 in the composite, the temperature of the hexagonal to orthorhombic transformation was decreased. As the sintering time was increased for a given composite composition, a drop in the temperature of the hexagonal to orthorhombic transformation was observed, which was linked to an increase in the beta-Si3N4 content in the composite. In addition, as the Si3N4 content in the composite was increased, a resultant drop in the coefficient of thermal expansion of the composite occurred. The extent of the linear dimensional change of the composite during the BAS hexagonal to orthorhombic transformation is reported.

引用

页码：1256 / 1263

页数：8

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