低频窄带压电陶瓷滤波器材料的研究

Study on Materials with Low Frequency and Narrow Bandwidth Piezoelectric Ceramic Filter

采用传统的压电陶瓷制备方法,研究锆钛比(r(Zr/Ti)、掺杂、烧成工艺对低频窄带Pb(Zn1/3Nb2/3)x(Sn1/3Nb2/3)yTiAZrBO3四元系压电陶瓷性能的影响,并研究压电振子的杂波抑制方法。结果表明,r(Zr/Ti)为0.71,w(MnO2)=0.5%时,材料的性能达到最佳:机械品质因数Qm=2 600,机电耦合系数k15=0.43,频率温度系数τf=29×10-6/℃;倒去振子两对角的棱角,可以有效地抑制低频厚度切变振动模式的杂波。

By using traditional piezoelectric ceramics preparation methods, influences of Zr/Ti ratio, doping and sintering technique on Pb（Zn1/3 Nb2/3 ）X （Sn1/3 Nb2/3 ）y TiAZrBO3 quaternary system piezoelectric ceramics were investigated and methods of clutter rejection were investigated. The results showed that the piezoelectric properties were optimal （Qm=2 600,k15=0.43,τf=29×10^-6/℃） when Zr/Ti= 0. 71 and adding w（MnO2）=0.5%. Chamfer angle could restrain noise of thickness shear vibration mode ceramic vibrators.