A Study on the Fabrication and Acoustic Properties of Piezocomposites

압전복합재료의 제작 및 음향특성 고찰

  • 이상욱 (영남대학교 전자정보공학과) ;
  • 남효덕 (영남대학교 전자정보공학과) ;
  • 류정탁 (대구대학교 정보통신공학부) ;
  • 김연보 (대구대학교 정보통신공학부)
  • Published : 2003.08.22

Abstract

In this paper, we investigated the electric and acoustic properties of piezoelectric composites, which were fabricated using polymer and piezoelectric ceramics, when the volume fraction of PZT varies. Practically, the shrinkage rate of polymer is an important factor in ultrasonic transducer fabrication. When 10 wt% filler A was added into polymer(Epofix), the lowest shrinkage was resulted. The electromechanical coupling factor($k_t$) of the fabricated piezoelectric composites showed its highest when the volume fraction PZT was 0.6. It decreased if the volume fraction was higher than the value. The relative permittivity and acoustic impedance of piezoelectric composites decreased linearly when PZT volume fraction was decreased. The lowest acoustic impedance was 3.2 when the volume fraction of PZT was 0.2.