R-Curve Behavior of Silicon Nitride–Titanium Nitride Composites |
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| Authors: | Heon-Jin Choi Kyeong-Sik Cho June-Gunn Lee Young-Wook Kim |
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| Affiliation: | Division of Ceramics, Korea Institute of Science and Technology, Cheongryang, Seoul 130-650, Korea;Department of Materials Science and Engineering, Seoul City University, Seoul 130-743, Korea |
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| Abstract: | The R –curve for Si3N4−40 wt% TiN composites was estimated by the indentation-strength method and compared to that of monolithic Si3N4 with duplex microstructure. Both materials exhibited rising R -curve behavior. The Si3N4-TiN composites, however, displayed better damage tolerance and higher resistance to crack growth. From TEM observation, it was inferred that this superior performance of Si3N4-TiN composites can be attributed mainly to stress-induced microcracking at hete rophase (Si3N4/TiN) boundaries. |
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