Fabrication and Properties of Lead-free Piezoelectric Buzzers Made from K0.5Na0.5NbO3-based Ceramics
Lead-free piezoelectric buzzers based on (K0.975Li0.025Na0.5)Nb0.95Sb0.05O3 (KLNNS2.5-5) ceramics were fabricated and their properties were investigated. The KLNNS2.5-5 ceramic membranes with diameter of 15–16 mm and thickness of 0.10–0.11 mm were prepared by the roll forming process. The electrical properties of the lead-free piezo-ceramic membranes are kp=0.445, d33=150 pC/N, εr=466 (at 1 kHz), and tan δ=0.033 (at 1 kHz). The resonance frequency (fr) of the super-thin buzzer disks is about 4.68 kHz. The sound pressure level (SPL) of the KLNNS2.5-5 buzzers reaches 84.2 dB at 2 kHz, and reaches a maximum value of 88.8 dB at 2.81 kHz, which are comparable to that of the lead-based ones. The electro-acoustic properties of the KLNNS2.5-5 buzzers can basically satisfy the requirements (≥ 80 dB) of microwave ovens applications. Results show that the KLNNS2.5-5 ceramics are promising candidates for practical application in buzzers.
lead-free piezoelectric buzzers K0.5Na0.5NbO3 electro-acoustic properties temperature stability
L. Wu D.Q. Xiao J.G. Zhu P. Yu Q. Wei Y. Zhuang
School of Material Science and Engineering,Sichuan University,Chengdu 610064,China School of Materia School of Material Science and Engineering,Sichuan University,Chengdu 610064,China GCI Science and Technology Co.Ltd.,Guangzhou 510310,China
国际会议
西安
英文
172-175
2009-08-23（万方平台首次上网日期，不代表论文的发表时间）