BiScO₃-BiFeO₃-PbTiO₃-BaTiO3 high-temperature piezoelectric ceramic and its application on high-temperature acoustic emission sensor

Abstract

Piezoelectric ceramic based high-temperature acoustic emission (AE) sensor is required urgently in the structural health monitoring of high-temperature fields. In this research, a series of 0.45(BiSc_xO₃-BiFe_1−xO₃)-0.48PbTiO₃-0.07BaTiO₃ (BSc_xFe_1−x-PT-BT, n(Sc)/n(Fe) =0.4/0.6 − 0.6/0.4) ceramics with both high Curie temperature and large piezoelectric constant were presented. The structure and electrical properties of BSc_xFe_1−x-PT-BT ceramics as a function of n(Sc)/n(Fe) have been systematically investigated. All the ceramics possess a perovskite structure, and the phase approaches from the rhombohedral toward the tetragonal phase with the decrease of n(Sc)/n(Fe). The BSc_0.5Fe_0.5-PT-BT and BSc_0.55Fe_0.45-PT-BT piezoelectric ceramics exhibit good piezoelectricity (d₃₃=250−281 pC/N), high Curie temperature (T_C=430−450 °C) and excellent temperature stability. These improvements are greatly attributed to the balance between rhombohedral and tetragonal phase near morphotropic phase boundary with dense microstructure of ceramics. AE sensor based BSc_0.5Fe_0.5-PT-BT piezoelectric ceramic was designed, prepared and tested. The high-temperature stability of AE sensor was characterized through pencil-lead breaking with in situ high-temperature test. The noise of AE sensor is less than 40 dB, and the acoustic signal is up to 90 dB at 200 °C. As a result, AE sensors based on BSc_xFe_1−x-PT-BT piezoelectric ceramics are expected to be applied into the structural health monitoring of high temperature fields.

Keywords

piezoelectric ceramics / high temperature / morphotropic phase boundary / phase transition / acoustic emission sensor

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