To improve the performance of ultrasonic transducer, the samples of PZT were improved by doping. The doped PZT was observed and analyzed from the following aspects： the crystal phase structures, the surface morpholog...To improve the performance of ultrasonic transducer, the samples of PZT were improved by doping. The doped PZT was observed and analyzed from the following aspects： the crystal phase structures, the surface morphologies and the dielectric constant. According to the transducer parameter requirements for ultrasonic machining, there are also requirements for the parameters of piezoelectric ceramics. The high performance PZT was prepared by doping the elements of Ga, Ba, Nb, Sn, and Sr in PZT. The doped PZT is suitable for power ultrasonic machining at 20 kHz through analysis using X-ray diffraction（XPD）, a scanning electron microscope（SEM） and LCR meter. Therefore, the excellent performance of transducer for power ultrasonic machining is guaranteed.展开更多
Novel PZT-5A ceramic-polymer composite was prepared via freezing technology.This composite exhibited good dielectric and ferroelectric behaviors.At 1 kHz,the dielectric constant and the dielectric loss were 546 and 0....Novel PZT-5A ceramic-polymer composite was prepared via freezing technology.This composite exhibited good dielectric and ferroelectric behaviors.At 1 kHz,the dielectric constant and the dielectric loss were 546 and 0.046,respectively,while the remnant polarization was 13.0μC=cm^(2)at room temperature.The electromechanical coupling coe±cient ekt T of PZT-5A composite was measured to be 0.54,which is similar to that of PZT piezoelectric ceramic.The piezoelectric coefficient(d_(33))of PZT-5A composite was determined to be~250 pC=N.Using this composite,a 58MHz single element transducer with the bandwidth of 70%at-6dB was built,and the insertion loss was tested to be-29dB around the central frequency.展开更多
The explosive demands for facial masks as vital personal protection equipment(PPE)in the wake of Covid-19 have challenged many industries and enterprises in technology and capacity,and the piezoelectric ceramic(PZT)tr...The explosive demands for facial masks as vital personal protection equipment(PPE)in the wake of Covid-19 have challenged many industries and enterprises in technology and capacity,and the piezoelectric ceramic(PZT)transducers for the production of facial masks in the welding process are in heavy demand.In the earlier days of the epidemic,the supply of ceramic transducers cannot meet its increasing demands,and efforts in materials,development,and production are mobilized to provide the transducers to mask producers for quick production.The simplest solution is presented with the employment of Rayleigh-Ritz method for the vibration analysis,then different materials can be selected to achieve the required frequency and energy standards.The fully tailored method and results can be utilized by the engineers for quick development of the PZT transducers to perform precise function in welding.展开更多
基金the National Natural Science Foundation of China(51275490)
文摘To improve the performance of ultrasonic transducer, the samples of PZT were improved by doping. The doped PZT was observed and analyzed from the following aspects： the crystal phase structures, the surface morphologies and the dielectric constant. According to the transducer parameter requirements for ultrasonic machining, there are also requirements for the parameters of piezoelectric ceramics. The high performance PZT was prepared by doping the elements of Ga, Ba, Nb, Sn, and Sr in PZT. The doped PZT is suitable for power ultrasonic machining at 20 kHz through analysis using X-ray diffraction（XPD）, a scanning electron microscope（SEM） and LCR meter. Therefore, the excellent performance of transducer for power ultrasonic machining is guaranteed.
基金This work has been partially supported by NIH grant#P41-EB2182.
文摘Novel PZT-5A ceramic-polymer composite was prepared via freezing technology.This composite exhibited good dielectric and ferroelectric behaviors.At 1 kHz,the dielectric constant and the dielectric loss were 546 and 0.046,respectively,while the remnant polarization was 13.0μC=cm^(2)at room temperature.The electromechanical coupling coe±cient ekt T of PZT-5A composite was measured to be 0.54,which is similar to that of PZT piezoelectric ceramic.The piezoelectric coefficient(d_(33))of PZT-5A composite was determined to be~250 pC=N.Using this composite,a 58MHz single element transducer with the bandwidth of 70%at-6dB was built,and the insertion loss was tested to be-29dB around the central frequency.
基金supported in part by the National Natural Science Foundation of China(No.11672142)the Technology Innovation 2025 Program of the Municipality of Ningbo(No.2019B10122)。
文摘The explosive demands for facial masks as vital personal protection equipment(PPE)in the wake of Covid-19 have challenged many industries and enterprises in technology and capacity,and the piezoelectric ceramic(PZT)transducers for the production of facial masks in the welding process are in heavy demand.In the earlier days of the epidemic,the supply of ceramic transducers cannot meet its increasing demands,and efforts in materials,development,and production are mobilized to provide the transducers to mask producers for quick production.The simplest solution is presented with the employment of Rayleigh-Ritz method for the vibration analysis,then different materials can be selected to achieve the required frequency and energy standards.The fully tailored method and results can be utilized by the engineers for quick development of the PZT transducers to perform precise function in welding.
