The Influence of External Stress on the Degradation Phenomena of PZT Ceramics

외부응력에 의한 PZT압전세라믹스의 열화현상

  • 임진호 (경북대학교 무기재료공학과) ;
  • 이준형 (경북대학교 무기재료공학과) ;
  • 김진호 (경북대학교 무기재료공학과) ;
  • 조상희 (경북대학교 무기재료공학과)
  • Published : 1994.06.01

Abstract

The influence of the direction of applied compressive stress on degradation mechanism ofpoled PZT sample was studied. When compressive stress perpendicular to poling direction was appliedon poled PZT sample, the degradation phenomena was explained by the diffusion of space chargepolarization. On the contrary, compressive stress parallel to poling direction was applied, it wasexplained by the rearrangement of 90" domains. As the grain size increased, the degradation phenomenawas promoted. It is attributed to different internal stress due to difference of grain size. of grain size.

분극처리된 PZT세라믹스에 외부응력을 인가하였을때 인가되는 응력의 방향에 따른 열화기구의 차이를 조사하였다. 그 결과 분극축과 수직으로 응력을 인가할때의 열화현상은 공간전하분극의 확산으로, 분극축과 평행하게 응력을 인가할때는 분역재배열현상으로 설명하였다. 소결체의 입자 크기가 커지면 열화폭이 커짐을 알 수 있었는데 이것은 입자크기에 따른 내부응력의 차이로 해석하였다.

Keywords

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