Electromechanical Displacement of Soft/Hard PZT Bi-Layer Composite Actuator

Abstract:

PZTs can be classified into two types, i.e., soft and hard PZTs, which are categorized by the piezoelectric and ferroelectric properties such as coercive field, piezoelectric strain, mechanical quality factor etc. It is known that the combination effect of the soft/hard PZT composites can generate large strain/actuation compared to monolithic PZT ceramics. In this study, soft and hard PZT powders were co-pressed into bi-layer disks with various ratios between soft and hard PZT powders, ranging from 0:100~100:0 vol. % (with 10 % increments) and then they were co-sintered. Due to the difference in the planar shrinkage of the two layers and thermal expansion coefficient mismatch, dome-shaped bi-layer composites with various dome heights were obtained. It was shown that the constrained layer either soft PZT or hard PZT affected various properties including the dome geometry, the strain-E-field response, and the displacement hysteresis loop. The electromechanical properties and actuation performance of such bi-layer composite actuators have been investigated and compared to the soft and hard PZT single layer counterparts.

• Periodical: Key Engineering Materials (Volume 659)
• Pages: 96-101
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.659.96
• Online since: August 2015
• Authors: Piyalak Ngernchuklin*, Arjin Boonruang, Chalearmchai Jeerapan, Pracha Laoauyporn, Sittichai Kanchanasutha, Jung Ho Ryu
• Keywords: Actuator, Bi Layer Composite, Hard PZT, Soft PZT

References

[1] B. Jaffe, W. R. Cook, JR and H. Jaffe, Piezoelectric Ceramics, Academic Press Inc., USA (1971).

[2] K. Uchino, K. Uchino, Ferroelectric Devices, Marcel Dekker Inc.; New York, USA , (2000).

[3] S. Park and T. R. Shrout, Ultrahigh strain and piezoelectric behavior in relaxor based ferroelectric single crystal, J. Appl. Phys. 82 4 (1997) 1804-1811.

DOI: 10.1063/1.365983

[4] K. Uchino, Piezoelectric actuators and Ultrasonic motors, Kluwer Academic Publishers, USA, (1997).

[5] G.H. Heartling, Ultra-High-Displacement Actuator , Am. Ceram. Soc. Bull. 73 1 (1994) 93-96.

[6] Chandra R., and Chopra I., Actuation of Trailing Edge Flap in a Wing Model Using a Piezostack Device, J. Int. Mat. Sys. Struc. 9 (1995) 847-853.

DOI: 10.2514/6.1997-1195

[7] J. G. Smits, S. I. Dalke and T. K. Cooney, The constitutent equation of piezoelectric Bimorphs, Sens Actuators A. 28 (1991) 41-61.

DOI: 10.1016/0924-4247(91)80007-c

[8] X. Li, W. Y. Shih, I.A. Aksay, and W-H. Shih, Electromechanical Behavior of PZT-Brass Unimorph, J. Am. Ceram. Soc. 82 7 (1999) 1733-1740.

DOI: 10.1111/j.1151-2916.1999.tb01993.x

[9] K.M. Mossi, G.V. Selby and R.G. Bryant, Thin-layer composite unimorph ferroelectric driver and sensor properties, Materials Lett. 35 (1998) 39-49.

DOI: 10.1016/s0167-577x(97)00214-0

[10] S.A. Wise, Displacement properties of RAINBOW and THUNDER piezoelectric actuators, Sens Actuators A. 69 (1998) 33-38.

DOI: 10.1016/s0924-4247(97)01745-7

[11] C. Xu, A. Dogan, J. Tressler, S. Yoshikawa and R.E. Newnham, Ceramic-metal composite actuator, Ferroelectrics. 160 (1994) 337-346.

DOI: 10.1080/00150199408222471

[12] A. Doğan, K. Uchino and R.E. Newnham, Composite piezoelectric transducer with truncated conical endcaps Cymbal, IEEE Trans. on Ultrason., Ferroelec. & Freq. Contr. 44 3 (1997) 597-605.

DOI: 10.1109/58.658312

[13] K.A. Klicker, J. V. Biggers, and R.E. Newham, Composites of PZT and Epoxy for Hydrostatic Transducer Applications, J. Am. Ceram. Soc. 64 1 (1980) 5-9.

[14] P. Ngernchuklin, J. Ryu, C. Eamchotchawalit, D.S. Park, Soft/hard monolithic bi-layer composite actuator, Ceram. Int. 39 (2013) S541-S544.

DOI: 10.1016/j.ceramint.2012.10.131