Comparison of High‐Temperature Crack Growth in SiC‐Whisker‐Reinforced Mullite and Si3N4
作者:
John E. Ritter,
Karl Jakus,
Micheal H. Godin,
Robert Ruh,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 7
页码: 1760-1766
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb07194.x
出版商: Blackwell Publishing Ltd
关键词: crack growth;high temperature;whiskers;mullite;silicon nitride
数据来源: WILEY
摘要:
Crack growth behavior under creep conditions was studied in SiC‐whisker‐reinforced mullite and silicon nitride. Tests of four‐point bend specimens with indentation cracks were periodically interrupted to observe the creep behavior. At each interruption the bulk creep strain of the specimen, the growth of the indentation cracks, and the nucleation and growth of creep‐induced cracks were measured. A strong linear correlation was observed in both materials between the crack growth rate and the creep strain rate. For a given strain rate, cracks in the silicon nitride composite propagated at velocities about an order of magnitude greater than those in the mullite composite. On the other hand, for similar nominal stresses, creep rates in the silicon nitride composites were about an order of magnitude less than with the mullite co
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