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Damage‐Resistant SiC–AlN Layered Composites with Surface Compressive Stresses

 

作者: Rengaswamy Sathyamoorthy,   Anil V. Virkar,   Raymond A. Cutler,  

 

期刊: Journal of the American Ceramic Society  (WILEY Available online 1992)
卷期: Volume 75, issue 5  

页码: 1136-1141

 

ISSN:0002-7820

 

年代: 1992

 

DOI:10.1111/j.1151-2916.1992.tb05550.x

 

出版商: Blackwell Publishing Ltd

 

关键词: silicon carbide;aluminum nitride;surface;compression;damage

 

数据来源: WILEY

 

摘要:

Three‐layer samples in the SiC‐AlN system with outer layers richer in SiC, as well as monolithic samples of uniform composition, were fabricated by hot‐pressing. The strain gage technique, previously described, was used to estimate residual compressive stress in the outer layers developed because of the difference in coefficients of thermal expansion between inner and outer layers. Bar‐shaped samples were indented using a Vickers indenter under loads as high as 20 kg (196 N) on outer layers and were fractured in three‐point bending. Three‐layer samples with outer layers under compression exhibited increased resistance to the contact‐induced damage in comparison to the monoc

 

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