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Journal of the Korean Ceramic Society 1999;36(5): 547. |
| 상압소결에 의해 제조한 자체 강인화 질화규소 세리믹의 미세조직과 기계적 성질 |
| 김완중, 이영규, 조원승, 최상욱 |
| 인하대학교 무기재료공학과 |
| Microstructure and Mechanical Properties of Self-Reinforced Si3N4 Ceramic Prepared by Pressureless-Sintering |
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| ABSTRACT |
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The self-reinforced Si3N4 ceramics were prepared by pressureless-sintering using ${beta}$-Si3N4 whiskers as a seed. Effects of ${beta}$-Si3N4 whiskers on microstructure and mechanical properties and the ${alpha}$ to ${beta}$ phase transition of Si3N4 were investigated. The self-reinforced Si3N4 ceramics were densified(relative density$geq$98%) by pressureless-sintering (1800$^{circ}C$ 2h) using 8mol% Y2O3 and 6mol% Al2O3 as sintering aids and 5 vol% ${beta}$-Si3N4 whiskers within self-reinforced Si3N4 ceramic seemed to hinder the densification owing to their acicular shapes but accelerated the ${alpha}$ to ${beta}$ phase transition because they acted as pre-existing nuclei. It was found that the more ${beta}$-Si3N4 nucei the faster ${alpha}$ to ${beta}$ phase transition. |
| Key words:
Pressureless-sintering, Self-reinforced silicon nitride, Microsttructure, Fracture toughness, Phase tran-sition |
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