Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Influence of Applied Electric Field on Low Temperature Degradation of Y-TZP

인가 전압이 Y-TZP의 저온열화에 미치는 영향

  • 장주웅 (연세대학교 세라믹공학과) ;
  • 이홍림 (연세대학교 세라믹공학과) ;
  • 김대준 (한국과학기술연구원 세라믹스부) ;
  • 오남식 (한국과학기술연구원 세라믹스부) ;
  • 이득용 (대림전문대학 금속재료과)
  • Published : 1997.12.01
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Abstract

Influence of applied electric field on the low temperature degradation of 3 mol% YaO3 stabilized tetragonal zirconia polycrystals(3Y-TZP) was investigated using X-ray diffractometry of specimens aged under the dc field of 1.1 kV/mm in silicone oil both of 12$0^{\circ}C$-21$0^{\circ}C$. After the aging, the tetragonal to monoclinic phase transformation was observed only on the specimen surface of 3Y-TZP faced to the anode. This indicated that the surface was overcrowded with oxygen ions as a result of diffusion of oxygen vacancies toward the cathode-sided surface. To elucidate an influence of the applying time of the electric field on the extent of the degradation of 3Y-TZP in air, specimens were aged fore 0-2 hours under the electric field in the oil bath of 12$0^{\circ}C$ and then subsequently aged for 3h at 22$0^{\circ}C$ in air. The longer the specimens were aged under the field, the more extensive the transformation to the monoclinic phase was on the specimen surface faced to the cathode, probably originated from a high diffusion rate of oxygen ions due to a steep oxygen vacancy concentration gradient.

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References

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