The dynamic characteristics of ultrasonic therapeutic transducers using lead-free Na0.5K0.5NbO3, based ceramics

Ming Ru Yang, Sheng Yuan Chu, Cheng Che Tsai, Cheng Shong Hong, Chih Lung Lin

研究成果: Chapter


In this paper, lead-free Na0.5K0.5NbO3 (NKN) based piezoelectric ceramics are synthesized by the conventional mixed-oxide methods with sintering temperature at 900-1050 °C. Microstructural analyses of un-doped and CuO-doped ceramics have been carried out and compared using X-ray diffraction (XRD) and scanning electron microscope (SEM). The dependence of the sintering temperatures of the CuO-doped NKN ceramics on the piezoelectric and dielectric properties have been investigated. The results show that the CuO-doped NKN specimens sintered at 1020 °C present the high thickness coupling factor, kt (>0.50), mechanical quality factor Qm = 1100 and the lower temperature coefficient of resonance frequency in thickness mode (dfr/fr < 2%) within the temperature range 20-100 °C. Then, we successfully construct 3-MHz transducers (LF transducer) utilizing our fabricated piezoceramics and examine their static resonant characteristics. Simultaneously, their dynamic acoustic power is measured by the acoustic force balance under a power circuit driving with the intermittent pulse control as compared to the commercial transducers. We find the effective coupling factor of LF transducer (0.05) is superior to that of commercial transducer (0.45).

主出版物標題Ceramics for Environmental and Energy Applications
出版狀態Published - 2010 一月 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Materials Science(all)

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