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Potassium-sodium niobate-based textured piezoelectric ceramic with high Curie temperature and temperature stability and preparation method of potassium-sodium niobate-based textured piezoelectric ceramic
The invention relates to potassium-sodium niobate based textured piezoelectric ceramic with high Curie temperature and temperature stability and a preparation method thereof. The textured piezoelectric ceramic has the chemical general formula of (0.99-x) ((K0. 5Na0. 5) (Nb0. 98Ta. 02) O3)-0.01 (Bi (Ni0. 67Nb0. 33) O3)-x (Bi0. 5K0. 5) HfO3 + 3wt.% NaNbO3, wherein x is greater than or equal to 0 and less than or equal to 0.04; the method comprises a solid-phase synthesis method, a two-step molten salt method combined separation method, a template grain growth method, a tape casting process, a hot pressing process, a glue discharging process, a two-step sintering process, a silver firing process and a polarization process. Compared with the prior art, the lead-free textured piezoelectric ceramic with high Curie temperature and high piezoelectric property can be obtained by combining a solid-phase synthesis method and a template grain growth method with a tape casting process and a two-step sintering process, and more importantly, the ceramic is of a single tetragonal phase structure, has high positive and negative piezoelectric coefficients, and can be used for preparing the piezoelectric ceramic with high Curie temperature and high piezoelectric property. And the change rate of the piezoelectric coefficient and the inverse piezoelectric coefficient in a wide temperature range is small, and the temperature stability is excellent.
本发明涉及具有高居里温度和温度稳定性的铌酸钾钠基织构压电陶瓷及其制备方法，该织构压电陶瓷化学通式为(0.99‑x)((K0.5Na0.5)(Nb0.98Ta0.02)O3)‑0.01(Bi(Ni0.67Nb0.33)O3)‑x(Bi0.5K0.5)HfO3+3wt.％NaNbO3，0≤x≤0.04；该方法包括固相合成法、两步熔盐法结合分离法、模板晶粒生长法、流延工艺、热压工艺、排胶工艺、两步法烧结工艺、烧银工艺和极化工艺。与现有技术相比，本发明通过固相合成法、模板晶粒生长法结合流延工艺、两步法烧结工艺，可以获得同时具备高居里温度和较高压电性能的无铅织构压电陶瓷，更重要的是，该陶瓷表现为单一四方相结构，具有较高的正逆压电系数，并且压电系数和逆压电系数在宽温度范围内变化率小，具有优异温度稳定性。
Potassium-sodium niobate-based textured piezoelectric ceramic with high Curie temperature and temperature stability and preparation method of potassium-sodium niobate-based textured piezoelectric ceramic
The invention relates to potassium-sodium niobate based textured piezoelectric ceramic with high Curie temperature and temperature stability and a preparation method thereof. The textured piezoelectric ceramic has the chemical general formula of (0.99-x) ((K0. 5Na0. 5) (Nb0. 98Ta. 02) O3)-0.01 (Bi (Ni0. 67Nb0. 33) O3)-x (Bi0. 5K0. 5) HfO3 + 3wt.% NaNbO3, wherein x is greater than or equal to 0 and less than or equal to 0.04; the method comprises a solid-phase synthesis method, a two-step molten salt method combined separation method, a template grain growth method, a tape casting process, a hot pressing process, a glue discharging process, a two-step sintering process, a silver firing process and a polarization process. Compared with the prior art, the lead-free textured piezoelectric ceramic with high Curie temperature and high piezoelectric property can be obtained by combining a solid-phase synthesis method and a template grain growth method with a tape casting process and a two-step sintering process, and more importantly, the ceramic is of a single tetragonal phase structure, has high positive and negative piezoelectric coefficients, and can be used for preparing the piezoelectric ceramic with high Curie temperature and high piezoelectric property. And the change rate of the piezoelectric coefficient and the inverse piezoelectric coefficient in a wide temperature range is small, and the temperature stability is excellent.
本发明涉及具有高居里温度和温度稳定性的铌酸钾钠基织构压电陶瓷及其制备方法，该织构压电陶瓷化学通式为(0.99‑x)((K0.5Na0.5)(Nb0.98Ta0.02)O3)‑0.01(Bi(Ni0.67Nb0.33)O3)‑x(Bi0.5K0.5)HfO3+3wt.％NaNbO3，0≤x≤0.04；该方法包括固相合成法、两步熔盐法结合分离法、模板晶粒生长法、流延工艺、热压工艺、排胶工艺、两步法烧结工艺、烧银工艺和极化工艺。与现有技术相比，本发明通过固相合成法、模板晶粒生长法结合流延工艺、两步法烧结工艺，可以获得同时具备高居里温度和较高压电性能的无铅织构压电陶瓷，更重要的是，该陶瓷表现为单一四方相结构，具有较高的正逆压电系数，并且压电系数和逆压电系数在宽温度范围内变化率小，具有优异温度稳定性。
Potassium-sodium niobate-based textured piezoelectric ceramic with high Curie temperature and temperature stability and preparation method of potassium-sodium niobate-based textured piezoelectric ceramic
具有高居里温度和温度稳定性的铌酸钾钠基织构压电陶瓷及其制备方法
HUA YIN (Autor:in) / ZHAI JIWEI (Autor:in) / SHEN BO (Autor:in)
16.07.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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