Fabrication and Fracture Behavior of Novel SiC Ceramics Having Rodlike Grains
作者:
Hironori Kodama,
Tadahiko Miyoshi,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 6
页码: 1558-1561
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb04224.x
出版商: Blackwell Publishing Ltd
关键词: silicon carbide;fabrication;whiskers;fracture;hot pressing
数据来源: WILEY
摘要:
A new type of silicon carbide having rodlike grains has been fabricated by hot‐pressing or hot‐pressing followed by hot isostatic pressing using SiC whiskers as the raw powder. Preliminary relationships between sintering conditions and microstructure and fracture toughness of the processed ceramics were established. Ceramics with relative density greater than 98% were prepared at temperatures of 2050°C or greater. The fracture toughness of these ceramics was better than that of ordinary SiC, and its maximum value was 7.3 MPa · m1/2. Grain pullout, grain bridging, and crack deflection were considered to be the main operative mechanisms which led to improved fractrue toug
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