Title :
1-3 piezoelectric composites for high power ultrasonic transducer applications
Author :
Gen, X. ; Ritter, T.A. ; Shung, K.K.
Author_Institution :
Blatek Inc., State College, PA, USA
Abstract :
The authors demonstrated that 1-3 PZT/polymer composites, fabricated using PZT-4 ceramic and a polymer possessing a high glass transition temperature and low loss, can be used as high power ultrasonic transducer materials for high intensity focused ultrasound (HIFU) applications. The mechanical quality factor of the 1-3 composite with 64% ceramic volume fraction is over 200. The dielectric loss tangent is the same as that of the ceramic used in the 1-3 composite at 1 kHz. The electromechanical coupling coefficients were 0.64 for pure epoxy filler and 0.68 for epoxy incorporating microspheres. The 1-3 composite transducers demonstrated a large operating bandwidth and elevated power capacity
Keywords :
biomedical transducers; biomedical ultrasonics; composite materials; piezoelectric transducers; radiation therapy; ultrasonic transducers; 1 kHz; 1-3 piezoelectric composites; dielectric loss tangent; electromechanical coupling coefficients; epoxy incorporating microspheres; high glass transition temperature; high power ultrasonic transducer applications; mechanical quality factor; operating bandwidth; pure epoxy filler; Ceramics; Composite materials; Dielectric losses; Dielectric materials; Glass; Polymers; Q factor; Temperature; Ultrasonic imaging; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE
Conference_Location :
Caesars Tahoe, NV
Print_ISBN :
0-7803-5722-1
DOI :
10.1109/ULTSYM.1999.849210
