Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Influence of Alumina-dispersion on the Microstructure and Fracture Toughness of Y-TZP Ceramics

알루미나 분산이 지르코니아 복합체의 미세구조와 파괴인성에 미치는 영향

  • 김민정 (조선대학교 금속.재료공학부) ;
  • 이종국 (조선대학교 금속.재료공학부) ;
  • 이은구 (조선대학교 금속.재료공학부)
  • Published : 2001.02.01
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Abstract

고 인성의 Y-TZP 세라믹스에 0.5$\mu\textrm{m}$, 1$\mu\textrm{m}$, 3$\mu\textrm{m}$ 알루미나를 20 vol% 분산시킨 후 입자크기에 따른 미세구조와 파괴인성 변화를 관찰하였다. 알루미나 분산 지르코니아 세라믹스는 98% 이상의 높은 밀도를 나타내었으며, 알루미나 입자가 균질하게 분산된 치말한 미세구조를 나타내었다. 알루미나를 분산시킨 시편에서는 순수 지르코니아에 비하면 파괴인성이 증가하였고, 분산시킨 알루미나 입자크기가 증가함에 따라 파괴인성이 증가하였다. 파괴인성은 분산된 알루미나 입자크기가 3$\mu\textrm{m}$일 때 3Y-TZP는 8.6 MPa.m$^{1}$2/에서 12.5 MPa.m$^{1}$2/로, 2Y-TZP는 13.5 MPa.m$^{1}$2/에서 18.9 MPa.m$^{1}$2/로 각각 증가하였는데, 이는 파괴시 알루미나 입자에 의한 균열편향 효과로 인하여 균열길이가 증가하기 때문이었다.

Keywords

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