Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Microstructure and Mechanical Properties of Self-Reinforced Si3N4 Ceramic Prepared by Pressureless-Sintering

상압소결에 의해 제조한 자체 강인화 질화규소 세리믹의 미세조직과 기계적 성질

  • 김완중 (인하대학교 무기재료공학과) ;
  • 이영규 (인하대학교 무기재료공학과) ;
  • 조원승 (인하대학교 무기재료공학과) ;
  • 최상욱 (인하대학교 무기재료공학과)
  • Published : 1999.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

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.

Keywords

References

  1. 한국요업학회 춘계총회;초청·특별강연;연구발표회 초록집 v.114 Si₃N₄의 기계적 성질과 미세조직에 미치는 β-Si₃N₄휘스커 첨가의 영향 김완중;이영규;장병국;조원승;최상욱
  2. 요업학회지 v.36 no.4 미세구조 제어에 의해 제조한 자체 강인화 질화규소 세라믹의 기계적 성질과 미세조직 김완중;이영규;조원승;최상욱
  3. Acta Metall. v.31 no.4 Crack Deflection Process Theory K.T. Faber;A. G. Evans
  4. J. Am. Ceram. Soc. v.74 no.9 Matrix-Grain-Bridging Contributions to the Toughness of Whiskers-Reinforced Ceramics P. F. Becher;E. R. Fuller;P. Angelini
  5. Acta Metall. v.36 no.3 Effects of Pull-Out on the Mechanical Properties of Ceramic-Matrix Composites M. D. Thouless;A. G. Evans
  6. J. Am. Ceram. Soc. v.79 no.9 High Termal Conductivity in Silicon Nitride with Anisotropic Microstructure K. Hirao;K. Watari;M. E. Brito;M. Tonyama;S. Kanzaki
  7. J. Am. Ceram. Soc. v.78 no.11 Fracture Resistance Behavior of Highly Anisotropic Silicon Nitride T. Ohji;K. Hirao;S. Kazaki
  8. J. Mater. Sci. v.13 The α/β Silicon Nitride Phase Transformation D. R. Messier;F. L. Filey;R. J. Brook
  9. Ceramics v.20 no.1 Indentation Microfracture of Ceramics K. Niibara
  10. Am. Ceram. Soc. Bull. v.56 no.9 Determiation of Phase Content of Si₃N₄by X-ray Diffraction Analysis C. P. Gazzara;D. R. Messier
  11. J. Jpn. Soc. Powder & Powder Metallurgy v.40 no.1 Effect of Uni-Directional Orientation of SiC Whiskers on Pressureless-Sintering Densification of SiC Whisker/Si₃N₄ Ceramics Composite W. S. Cho;K. Hayashi
  12. J. Ceram. Soc. Jpn. v.102 no.9 TEM Analysis of Core-Rim Structure in β-Silicon Nitride Ceramics N. Hirosaki;M. Tanimura;Y. Akimune;M. Mimoto
  13. Nonoxide Technical and Engineering Ceramics Microstructural Development, Microstructural Characterization and Relation to Mechanical Properties of Dense Silicon Nitride G. $W\"{o}tting$;B. Kanka;G. Ziegler;S. Hampshire(ed.)
  14. J. Jpn. Inst. Metals v.57 no.11 Observation of Fracture Source in High Strength Silicon Nitride-Based Ceramics Y. Yanaba;W. S. Cho;K. Hayashi
  15. J. Ceram. Soc. Jpn. v.100 no.7 Effect of Kinds of Sintering Aids of Rare Earth Oxides on Si₃N₄Grain size and Fracture Toughness of SiC Whisker/Si₃N₄Composite Ceramics W. S. Cho;K. Hayashi
  16. J. Mater. Sci. v.13 Hot-pressing and the α-β Phase Transformation in Silicon Nitride L. J. Bowen;R. J. Weston;T. G. Carruthers;R. J. Brook