The Vibrational Characteristic in Annular Piezoelectric Ceramics

• Main Authors: Chin-Yen Liu, 劉錦燕
• Other Authors: Long Wu
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/46408112253265105096

碩士 === 國立成功大學 === 電機工程研究所 === 82 === The annular piezoelectric ceramics are different in shape and vibrational modes to that of disk,so the coupling factor of annular structure can't calculate by the general formula used for disk.In annular structure the coupling factor is caused-and- effect with vibrational modes and capacitance. And the vibrational mode and capacitance are effect by the wave number and poling method. In this thesis,the Pb.(Zr.Ti.).Nb.O +0.5wt% Mn is used as the base material for annular piezo- electric ceramics. The samples with 3λ, 5λand7λelectrode had been made, the sinter temperature is 1290℃. Two poling conditions are used, 1.both postive and negative regions are poling simultaneo us for 1hr. 2.the positive regions are poling first for 30 min and then the negative regions are poling with the same time. The poling field and temperature for both cases are 3KV/mm and 100℃, respectively. For study the influence of geometry parameters to the vibr- ational characteristic , the 5λstructure with different thickness and annular radial are used.