Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Fabrication of 1-3 Piezo-composites with a "Dice & Fill" Method and Characterization of Their Piezoelectric Properties as a Function of Lateral Spatial Scale

"Dice와 fill" 방식을 이용한 1-3 압전복합재의 제조와 횡방향 단위 크기에 따른 압전특성 평가

  • Kim, Young-Deog (Research Institute of Industrial Science & Technology, Process Automation Research Center, Sensor & Instrumentation Team) ;
  • Kim, Kwang-Il (Research Institute of Industrial Science & Technology, Process Automation Research Center, Sensor & Instrumentation Team) ;
  • Jeong, Woo-Cheol (Research Institute of Industrial Science & Technology, Process Automation Research Center, Sensor & Instrumentation Team) ;
  • Kim, Heung-Rak (Research Institute of Industrial Science & Technology, Process Automation Research Center, Sensor & Instrumentation Team) ;
  • Kim, Dong-Su (Research Institute of Industrial Science & Technology, Process Automation Research Center, Sensor & Instrumentation Team)
  • 김영덕 (포항산업과학연구원 설비자동화연구센터 센서계측연구팀) ;
  • 김광일 (포항산업과학연구원 설비자동화연구센터 센서계측연구팀) ;
  • 정우철 (포항산업과학연구원 설비자동화연구센터 센서계측연구팀) ;
  • 김흥락 (포항산업과학연구원 설비자동화연구센터 센서계측연구팀) ;
  • 김동수 (포항산업과학연구원 설비자동화연구센터 센서계측연구팀)
  • Published : 2002.08.30
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Abstract

The piezoelectric composites had many advantages in comparison with conventional piezoelectric ceramics and piezopolymers for ultrasonic transducers used in NDT and in medical ultrasionic imaging. The electromechanical coupling coefficient should be high and the acoustic impedance should be low in these applications. However, the cross-coupling with spurious oscillations caused by laterally running plate waves exhibited complex motions in the surface of piezoelectric composites with coarse lateral spatial scale. The thickness mode electromechanical coupling coefficient of 1-3type of piezoelectric compoistes were 0.36 to 0.64, and the acoustic impedance of them were 9.8 to 22.7 MRayl. The lateral resonance frequency of 1-3 type piezoelectric composites shifted to high frequency region with decreasing lateral spatial scale.

NDT나 의료용 영장장치에 응용되는 압전복합재는 일반적인 세라믹이나 고분자 압전재료에 비하여 많은 장점을 가진다. 이들 응용분야에서는 전기기계결합계수가 높아야 하고 음향임피던스가 낮아야 한다. 그러나, 압전복합재의 횡방향 단위 크기가 조밀하지 못할 경우 횡방향으로 진행하는 판파에 의한 불필요한 진통이 표면에 발생하게 된다. 횡방향 단위 크기와 세라믹 체적비에 따른 압전 특성을 조사하기 위하여 PMN-PZT 세라믹과 Epofix 에폭시로 에폭시의 폭의 달리하면서 1-3형 압전복합채를 제작하였다. 제작된 1-3형 압전복합재의 두께방향 진동모드의 전기기계결합계 수, 음향임피던스는 각각 $0.36{\sim}0.64,\;9.8{\sim}22.7MRayl$ MRayl로 나타났으며, 횡방향 단위크기가 줄어들수록 횡방향 모드 공진 주파수가 증가하였다.

Keywords

References

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