Potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof: Fid-Bau Portal

Potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof

YAO FANGZHOU / LI JIAJIU / YANG WANRONG

The invention discloses a sodium potassium niobate-based leadless piezoelectric ceramic and a preparation method thereof, the general formula of the sodium potassium niobate-based leadless piezoelectric ceramic is (1-x) (Na, K, Li) (Nb, Ta) O3-xCaZrO3-yMnO2, x is greater than or equal to 0 and less than or equal to 0.1, y is greater than or equal to 0 and less than or equal to 0.04, x is the atomic percent of CaZrO3 in the total amount of raw materials, y is the mass percent of MnO2 in the total amount of the raw materials, the sodium potassium niobate-based leadless piezoelectric ceramic has the piezoelectric constant d33 of 280-360 pC/N, and the piezoelectric constant d33 is greater than or equal to 0 and less than or equal to 0. The fluctuation of the reverse piezoelectric constant d33 * of the potassium-sodium niobate-based leadless piezoelectric ceramic within the temperature range from room temperature to 150 DEG C does not exceed 10%. According to the method, the potassium-sodium niobate-based leadless piezoelectric ceramic with excellent piezoelectric property and temperature stability can be effectively prepared, the piezoelectric constant d33 of the potassium-sodium niobate-based leadless piezoelectric ceramic reaches 280-360 pC/N, the temperature stability of the piezoelectric property of the potassium-sodium niobate-based leadless piezoelectric ceramic is very excellent, and the fluctuation range of the potassium-sodium niobate-based leadless piezoelectric ceramic is kept within +/-10% within the temperature range of room temperature to 150 DEG C.

本发明公开了一种铌酸钾钠基无铅压电陶瓷及其制备方法，铌酸钾钠基无铅压电陶瓷的通式为(1‑x)(Na,K,Li)(Nb,Ta)O3‑xCaZrO3‑yMnO2,0≤x≤0.1,0≤y≤0.04，其中x为CaZrO3的占原料总量的原子百分比，y为MnO2占原料总量的质量百分比，所述铌酸钾钠基无铅压电陶瓷具有280‑360pC/N的压电常数d33，所述铌酸钾钠基无铅压电陶瓷的反向压电常数d33*在室温至150℃的温度范围内的波动不超过10％。本发明通过本方法，可以有效制备得到具有优异压电性能与温度稳定性的铌酸钾钠基无铅压电陶瓷，且其压电常数d33达280‑360pC/N，其压电性能的温度稳定性非常优异，在室温至150℃的温度范围内保持在±10％的波动范围之内。

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