Title :
Investigation of high frequency (2.45 GHz, 30 GHz) processing of Pb-based piezoelectrics for ultrasound transducers
Author :
Rhee, S. ; Shrout, T.R. ; Ritter, T.A. ; Thumm, M.
Author_Institution :
NIH Transducer Resource Center, Pennsylvania State Univ., PA, USA
Abstract :
Microwave sintering of PZT based ceramics was investigated using multimode heating at 2.45 and 30 GHz and compared to conventional processing. For PZT 5 and PZT 5H microwave processing resulted in reduction of sintering temperature by more than 150°C. Of significance to the production of high surface area lead-based components, minimal PbO volatility was detected for samples processed as high as 1200°C. Microwave sintered fine scale 1-3 piezo composites prepared by the molding technique resulted in a thickness coupling coefficient of 56% and an acoustic impedance of 11.6 MRayls. Bandwidths of greater than 80% were modeled for optimally matched transducers
Keywords :
acoustic impedance; densification; lead compounds; microwave heating; moulding; piezoceramics; piezoelectric transducers; powder technology; sintering; ultrasonic transducers; 1-3 piezo composites; 2.45 GHz; 30 GHz; HF processing; PZT; PbZrO3TiO3; acoustic impedance; densification; high surface area components; microwave sintering; minimal PbO volatility; molding technique; multimode heating; optimally matched transducers; piezoelectric ceramics; sintering temperature reduction; thickness coupling coefficient; ultrasound transducers; Acoustic signal detection; Acoustic transducers; Bandwidth; Ceramics; Electromagnetic heating; Frequency; Microwave theory and techniques; Production; Surface impedance; Temperature;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.921489
