Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Low Temperature Degradation Behavior of $^{18}O$-Containing Y-TZP

$^{18}O$을 함유하는 X-TZP의 저온열화거동

  • 김병국 (한국과학기술연구원 세라믹스연구부)
  • Published : 1997.02.01
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Abstract

It was experimentally identified, for the first time, that oxygen phonons play an important role in the low temperature degradation(tetragonallongrightarrowmonoclinic phase transformation) of yttria stabilized tetragonal zir-conia polycrystals (Y-TZP). The degradation accompanied by immersing the samples in the boiling water were markedly reduced by substituting of 18O for 16O in Y-TZP. This was attributed to the heavier mass of 18O which leads to the smaller probability to find oxygen atoms beyond certain critical displacements.

산소포논(phonon)이 Yttiria안정화 정방정 지르코니아 소결체(Yttria Stabilized Tetragonal Zirconia Po-lycrystals, Y-TZP)의 저온열화에 큰 영향을 미치는 사실을 실험적으로 밝혔다. Y-TZP의 저온열화 (정방정$\longrightarrow$단사정 상전이) 현상은 Y-TZP의 16O을 18O으로 치환함으로써 급격히 저하되었다. 이는 16O이 보다 무거운 18O으로 치환됨에 따라 임계변위 이상에서 산소원자가 존재할 확률이 감소하는 데 기인하는 것으로 설명하였다.

Keywords

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