Effect Of Freeze-Thaw Cycles On Electrical Properties Of 2-2 Cement-Based Piezoelectric Composites

Composite with 2-2 connectivity was fabricated from Portland cement and PZT-5H by the cutting-filling-re-cutting. The effects of freeze-thaw cycles on the piezoelectric and dielectric properties of the 2-2 cement-based piezoelectric composites were analyzed using a quasi-static d
33
tester and a precision impedance analyzer. The results show that with the increase in freeze-thaw cycles, the piezoelectric strain factor d
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and piezoelectric voltage factor g
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decreased nonlinearly. In the first 30 freeze-thaw cycles, the mechanical quality Q
m
decreased linearly. The relative dielectric constant at the resonance absorption peak decreased gradually, and the impedance value at the resonance frequency of thickness vibration also gradually decreased. At higher frequencies, the relative dielectric constant remained stable, showing good dielectric-frequency stability.