ACTUATOR 2014 Manuscript A1.4


Author: Hubert Borgmann
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Pages: 4
Language: English
Publication date: 07/04/2015
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Manuscript A1.4 published in Conference Proceedings ACTUATOR 2014
Hardening Mechanism in Lead-Free Piezoelectric Ceramics and Their Behavior Under High Power Conditions

E.A. Gurdal1, L. Zhang2, T. Tou3, M. Hajezi4, A. Safari4, K. Uchino5
1 The Pennsylvania State University, Pennsylvania, USA
2 Xi'an Jiaotong University, Xi'a, China
3 Honda Electronics Co., Toyohashi, Japan
4 Rutgers University, Piscataway, New Jersey, USA
5 ONR Global-Asia, Office of Naval Research, Tokyo, Japan

Abstract:
Na0.5K0.5(Nb0.97Sb0.03)O3:NKN was prepared with mixed oxides method and mixed with Yb2O3, NiO, MnO2, and CuO at 1.5 mol%. Pellets were sintered around 1100˚C for 3h in ambient atmosphere. All ceramics showed pure perovskite phase with high relative density (~99%). Doping improved both coercive (Ec) and internal bias field (Ei). Cu-doped NKN ceramics possessed the highest coercive and internal bias fields (Ec=1.23 kV/mm and Ei=0.37 kV/mm). Longer calcination time (+4h) futher improved both coercive and internal bias fields (Ec=1.70 kV/mm and Ei=0.60 kV/mm). NKN-Cu and NKN-Mn showed hard characteristics with lower dielectric loss (tanδ≤0.01) and higher mechanical quality factor (Qm≥200) when compared to Yb-doped, Ni-doped and the
base NKN ceramics. Increase in Qm and thus the hardening started above a threshold around E=0.20 kV/mm. Above 0.2 kV/mm, Ei and Qm were proportional to each other. High power behavior of several lead-free piezoelectric ceramics was also investigated. Bismuth perovskite and alkali-niobate ceramics were chosen and compared to a commercially available hard-PZT. Disk shape ceramics were continuously excited at high vibration velocity levels in radial mode. Hard lead-free ceramics were much more durable at high power conditions when compared to hard-PZT’s. Hard lead-free ceramics also possessed higher maximum vibration velocity (vmax=0.4 m/s) when compared to hard-PZT’s (vmax=0.3 m/s). This superior behavior makes lead-free piezoelectric ceramics very promising for high power applications in the future.
El vendedor asume toda la responsabilidad de esta entrada.
Hubert Borgmann, MESSE BREMEN,
Project Manager ACTUATOR, International Conference and Exhibition on New Actuators and Drive Systems, Bremen, Germany, and Editor of the ACTUATOR Conference Proceedings (www.actuator.de)
Project Manager ITHEC, International Conference and Exhibition on Thermoplastic Composites, Bremen, Germany, and Editor of the ITHEC Conference Proceedings (www.ithec.de)

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