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http://dx.doi.org/10.4313/JKEM.2016.29.10.601

Characteristics and Fabrication of Multi-Layered Piezoelectric Ceramic Actuators for Speaker Application  

Lee, Min-seon (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology)
Yun, Ji-sun (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology)
Park, Woon Ik (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology)
Hong, Youn-Woo (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology)
Paik, Jong Hoo (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology)
Cho, Jeong Ho (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology)
Park, Yong-Ho (Department of Material Science and Engineering, Pusan University)
Jeong, Young-Hun (Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.29, no.10, 2016 , pp. 601-607 More about this Journal
Abstract
Piezoelectric thick films of soft $Pb(Zr,Ti)O_3$ (PZT) based commercial material (S55) were fabricated using a conventional tape casting method. Ag-Pd electrodes were printed on the piezoelectric film at room temperature and all 5 layered films with a dimension of $12mm{\times}16mm$ were successfully laminated for a multi-layered piezoelectric ceramic actuator. The laminated specimens were co-fired at $1,100^{\circ}C$ for 1 h. A flat layered and dense microstructure was obtained for the $112{\mu}m$ thick piezoelectric actuator after sintering process. Thereafter, a prototype piezoelectric speaker was fabricated using the multi-layered piezoelectric ceramic actuator which can operate as a bimorph. Its SPL (sound pressure level) characteristic was also evaluated for speaker application. Frequency response revealed that the output SPL with a root mean square voltage of 10 V increased gradually to the highest peak of 87.5 dB for 1.5 kHz and exhibited a relatively stable behavior over the measured frequency range (${\leq}20kHz$) at a distance of 10 cm, implying that the fabricated piezoelectric speaker is potential for speaker applications.
Keywords
Tape casting; Piezoelectric; Actuator; Speaker; Bimorph; PZT;
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