Dynamic and Static Fatigue Behavior of Sintered Silicon Nitrides: II, Microstructure and Failure Analysis

The microstructures and failure mechanisms of a sintered silicon nitride, tested under dynamic and static fatigue conditions, were studied. For longer test times at 1000°C, all specimens showed a slow crack growth mechanism of failure, with failure generally initiating at a defect. Even more importa...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1989-08, Vol.72 (8), p.1338-1342
Main Authors: Rawlins, Mary H., Nolan, Theodore A., Allard, Lawrence F., Tennery, Victor J.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
fatigue
mechanical properties
microstructure
silicon nitride
sintering
Technical ceramics
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Summary:The microstructures and failure mechanisms of a sintered silicon nitride, tested under dynamic and static fatigue conditions, were studied. For longer test times at 1000°C, all specimens showed a slow crack growth mechanism of failure, with failure generally initiating at a defect. Even more importantly, these specimens contained cracks in addition to the failure fracture which extended into the material surrounding the initiation site. The cracking always appeared to occur within an amorphous grain‐boundary phase.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1989.tb07648.x