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Journal of the Korean Ceramic Society 1997;34(12): 1268. |
| 질화규소 이층 층상재료에서 코팅층의 파괴에 관한 연구 : I. Elastic/Plastic Mismatch의 영향 |
| 이기성, 이승건1, 김도경 |
한국과학기술원 재료공학과
1미국 표준과학연구소 |
| A Study on the Coating Fracture in Silicon Nitride Bilayer : I. Effect of Elastic/Plastic Mismatch |
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| ABSTRACT |
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Effect of elastic/plastic mismatch on the fracture of Si3N4 coating in Si3N4/Si3N4 -BN bilayer was investigated by Hertzian indentation testing. A different amount of mismatch between two layers was induced by different BN addition in the substrate layer, and Hertizian cracks were induced by using WC ball indenter. As a result, as the elastic/plastic mismatch between coating and substrate layer increased, the coating fracture easily occurred. A bending stress induced by different elastic/plastic mismatch was main reason to cause the fracture of coating. |
| Key words:
Coating fracture, Contact damage, Elastic/plastic mismatch, Hertzian test |
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