High performance piezoelectric composite fabricated at ultra low temperature
Siponkoski, Tuomo; Nelo, Mikko; Ilonen, Niklas; Juuti, Jari; Jantunen, Heli (2021-11-13)
Siponkoski, T., Nelo, M., Ilonen, N., Juuti, J., & Jantunen, H. (2022). High performance piezoelectric composite fabricated at ultra low temperature. Composites Part B: Engineering, 229, 109486. https://doi.org/10.1016/j.compositesb.2021.109486
© 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2022042029695
Tiivistelmä
Abstract
This work presents the next leap in piezoelectric all-ceramic composites fabricated at ultra low temperatures. The “Upside-down” composite method is further developed and instead of the water-soluble lithium molybdate used in our earlier study, an organotitanate based precursor gel is used as a binder. Utilizing heat and pressure the precursor transforms into titanium oxide which, together with lead zirconate titanate particles, forms a high-performance piezoelectric composite. The two-step fabrication method is based only on mixing and uniaxial hot-pressing sequences. The all-ceramic samples are fabricated at ultra low temperatures 275–350 °C with exceptionally high fractions of filler (filler to matrix 84:16 vol ratio) resulting in low porosity and showing excellent dielectric and piezoelectric properties. The charge coefficient d₃₃ ∼150 pC N−1 and the voltage coefficient, g₃₃ ∼52 mVm N−1 obtained with the developed composite outperforms many other known composites (80% and 70% higher than achieved with lithium molybdate bound upside-down composite, respectively) and are comparable even to some bulk piezoceramics and low permittivity polymer-ceramic piezocomposites. The sensor properties of the developed composite and the feasibility of the material from the application point of view are successfully demonstrated by utilizing sample elements in a charge mode acceleration sensor and sensitivities comparable to commercial devices are achieved.
Kokoelmat
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