Piezoelectric Ceramic Ring PZT8 50X17X6mm

Piezoelectric Ceramic Ring PZT8 50X17X6mm PZT8 and PZT4 are the common “hard” piezoceramic materials used in power ultrasonic transducers (e.g., welding, cutting, sonar, etc.). PZT8 is perceived as the better choice for resonant devices, primarily due to its higher mechanical quality factor Qm....
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Piezoelectric Ceramic Ring PZT8 50X17X6mm


PZT8 and PZT4 are the common “hard” piezoceramic materials used in power ultrasonic  transducers (e.g., welding, cutting, sonar, etc.).  


PZT8 is perceived as the better choice for resonant devices, primarily due to its higher mechanical quality factor Qm. PZT8 is also considered a “harder” material compared to PZT4, since it has  better stability at higher preloads and drive levels.  


Many transducer designers never consider PZT4 for their applications, even though it has clear  advantages such as higher output (i.e., higher d33).  Even the perceived advantage of PZT8 regarding Qm may not be significant for most Langevin,  bolted stack type transducers if the mechanical joint losses dominate.  


This research is a case study on the performance of identical ultrasonic transducers used for  semiconductor wire bonding, assembled with either PZT8 or PZT4 materials.  


The main purpose of the study is to establish rule-of-thumb transducer design guidelines for the  selection of PZT8 versus PZT4 materials. Several metrics are investigated such as impedance,  frequency, capacitance, dielectric loss, Qm, heating, displacement gain, and electro-mechanical  coupling factor.  


The experimental and theoretical research methods include Bode plots, thermal IR camera  imaging, scanning laser vibrometry and coupled-field finite element analysis.

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