한국분말재료학회지 (Journal of Powder Materials)

  • 제10권2호
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  • Pages.118-122
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  • 2003
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  • 2799-8525(pISSN)
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  • 2799-8681(eISSN)
한국분말재료학회 (*구 분말야금학회) (The Korean Powder Metallurgy & Materials Institute)
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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
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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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