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

LI JINGFENG

The invention relates to the technical field of functional ceramic materials, in particular to potassium-sodium niobate-based leadless piezoelectric ceramic and a preparation method thereof. According to the preparation method disclosed by the invention, a solid-phase method is adopted, and the ceramic powder is directly prepared into the potassium-sodium niobate-based lead-free piezoelectric ceramic with the multilayer structure, so that good temperature stability is realized. Components of each layer of the potassium-sodium niobate-based leadless piezoelectric ceramic with the multilayer structure prepared by the preparation method can be regulated and controlled, each layer of ceramic has a multiphase coexistence structure, and the transformation temperature is sequentially increased from one layer to another layer. Components of each layer employ similar chemical components to ensure good co-firing and easy control of diffusion at high temperature. Finally, the obtained multi-layer potassium sodium niobate-based piezoelectric ceramic sample has relatively high piezoelectric property and relatively good temperature stability at the same time. The preparation method is simple and convenient to operate, short in period, low in cost and low in energy consumption.

本发明涉及功能陶瓷材料技术领域，具体而言涉及一种铌酸钾钠基无铅压电陶瓷及其制备方法。本发明制备方法采用固相法，直接将陶瓷粉制备成多层结构铌酸钾钠基无铅压电陶瓷，从而实现良好的温度稳定性。本发明制备方法制备的多层结构铌酸钾钠基无铅压电陶瓷中每层的成分可调控，每层陶瓷均具有多相共存结构，转变温度从一层依次上升到另一层。每层组分采用相似的化学成分，以确保良好的共烧和易于控制在高温下的扩散。最终使得到的多层铌酸钾钠基压电陶瓷样品在保留较高的压电性能的同时兼具较好的温度稳定性。本发明制备方法操作简便、周期短、成本低、能耗少。

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