DOI QR코드

DOI QR Code

Effect of Phase Stability on the Microstructure Development of α-SiAlON Ceramics

  • Kim, Joosun (Nano-Materials Research Center, Korea Institute of Sci. & Tech.) ;
  • Lee, Hae-Weon (Nano-Materials Research Center, Korea Institute of Sci. & Tech.) ;
  • Chen, I-Wei (Dept. of material Sci. & Eng., Univ. of Pennsylvania)
  • 발행 : 2003.04.01

초록

Alpha-SiAlON ceramics having various compositions and modifying cations were investigated with respect to their phase stability, transformation kinetics. and resulting microstructures. Each composition was heat treated at 150$0^{\circ}C$ for 1h and measured the $\alpha$-SiAlON transformation. The phase-boundary composition in the single-phase $\alpha$-SiAlON region showed sluggish transformation from $\alpha$-$Si_3N_4$ to $\alpha$-SiAlON compared to the phase-center composition in the diagram. Using the different rare earth modifying cations, dependence of transformation kinetics on the phase stability in a fixed composition was also explained. By changing size of the stable u-phase region with exchanging cations, systematic change in transformation was observed. Transformation rate of $\alpha$-SiAlON at low temperature has an important role on controlling the final microstructure. Less transformation gives more chances to develop elongated grain in the microstructure.

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참고문헌

  1. Proc. of 4th Intl Symp. Ceram. Mater. Comp. for Engines H.Takao
  2. J. Am. Ceram. Soc. v.75 T.Ekstrom;M.Nygren https://doi.org/10.1111/j.1151-2916.1992.tb08175.x
  3. J. Am. Ceram. Soc. v.84 M.Zenotchkine;R.Shuba;J.Kim;I.Chen https://doi.org/10.1111/j.1151-2916.2001.tb00894.x
  4. J. Am. Ceram. Soc. v.85 R.Shuba;I.Chen https://doi.org/10.1111/j.1151-2916.2002.tb00255.x
  5. J. Am. Ceram. Soc. v.85 M.Zenotchkine;R.Shuba;J.Kim;I.Chen https://doi.org/10.1111/j.1151-2916.2002.tb00254.x
  6. J. Am. Ceram. Soc. v.84 M.Zenotchkine;R.Shuba;J.Kim;I.Chen https://doi.org/10.1111/j.1151-2916.2001.tb00760.x
  7. J. Eu. Ceram. Soc. v.19 A.Rosenflanz;I.Chen https://doi.org/10.1016/S0955-2219(99)00099-0
  8. J. Am. Ceram. Soc. v.82 A.Rosenflanz;I.Chen https://doi.org/10.1111/j.1151-2916.1999.tb01869.x
  9. Nature v.389 I.Chen;A.Rosenflanz https://doi.org/10.1038/39542
  10. J. Am. Ceram. Soc. v.83 J.Kim;A.Rosenflanz;I.Chen https://doi.org/10.1111/j.1151-2916.2000.tb01472.x
  11. J. Am. Ceram. Soc. v.74 W.Y.Sun;T.Y.Tien;T.S.Yen https://doi.org/10.1111/j.1151-2916.1991.tb06797.x
  12. J. Am. Ceram. Soc. v.74 W.Y.Sun;T.Y.Tien;T.S.Yen https://doi.org/10.1111/j.1151-2916.1991.tb06839.x
  13. J. Am. Ceram. Soc. v.81 L.Nordberg;M.Nygren https://doi.org/10.1111/j.1151-2916.1998.tb02504.x
  14. J. Am. Ceram. Soc. v.69 Z.K.Huang;D.S.Yan;T.Y.Tien