STUDY OF FRACTURE-BEHAVIOR OF VERY FINE-GRAINED SILICON-CARBIDE CERAMICS

被引：47

作者：

KODAMA, H

MIYOSHI, T

机构：

[1] Hitachi Research Laboratory, Hitachi, Ltd., Hitachi, Ibaraki

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1990年 / 73卷 / 10期

关键词：

fracture toughness; grain size; hot pressing; pyrolysis; silicon carbide;

D O I：

10.1111/j.1151-2916.1990.tb06720.x

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：

Dense, fine‐grained silicon carbide (SiC) ceramics were fabricated by a hot‐pressing technique using pyrolyzed polycarbosilane powders. Hot‐isostatic pressing treatments were also applied to some of these hot‐pressed samples. The grainsize range of the obtained sintered bodies was from 0.2 to 1.4 μm, which was much finer than that of ordinary sintered SiC ceramics. Relationships among sintering conditions, microstructures, and fracture toughness of the obtained ceramics were investigated. A clear grain‐size dependence of fracture toughness was observed in this very fine‐grain region (0.2 to 1.4 μm). Fracture toughness showed its maximum (5.1 MPa.m1/2) at the average grain size of ∼0.7 μm. Also, the fracture toughness of the samples having similar grain sizes increased with increasing relative density. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：3081 / 3086

页数：6

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