超快激光制备高频1-3型PIN-PMN-PT复合材料超声换能器

Fabrication of High-Frequency PIN-PMN-PT 1-3 Piezoelectric Composite Transducers Based on Ultrafast Laser

与其他压电材料相比,1-3型压电单晶复合材料具有优异的压电性能和更匹配的声学特性,更有利于制备出性能优异的超声换能器。该文通过有限元软件COMSOL对复合材料的振动模态及阻抗特性进行了系统的研究,同时采用皮秒激光制备了高频1-3型Pb(In_(1/2)Nb_(1/2))O_(3)-Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)(PIN-PMN-PT)铁电单晶/环氧树脂复合材料,并进行了性能表征。该1-3复合材料机电耦合系数为0.65,声阻抗为19.96 MRayls。该复合材料可用于制备高频超声换能器,结果表明,换能器中心频率为17.68 MHz,-6 dB带宽为84.38%,插入损耗为-25.4 dB。

Compared with other piezoelectric materials,1-3 piezoelectric single crystal composite materials have excellent piezoelectric properties and better acoustic matching properties,which are better for preparing high-performance ultrasonic transducers.In this paper,the vibration mode and impedance characteristics of the composites were systematically investigated by the finite element software COMSOL,and the high-frequency Pb(In_(1/2)Nb_(1/2))O_(3)-Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)(PIN-PMN-PT)ferroelectric single crystal/epoxy resin 1-3 composites were prepared by picosecond laser and their performance was characterized.The electromechanical coupling coefficient of the prepared 1-3 piezoelectric composites is 0.65,acoustic impedance is 19.96 MRayls.A high-frequency ultrasound transducer is fabricated by using the 1-3 composites.The transducer has center frequency of 17.68 MHz,-6 dB bandwidth of 84.38%and insertion loss of-25.4 dB.