High-performance lead-free piezoelectric potassium-sodium niobate-based ceramic and preparation method thereof

CN119528570AActive Publication Date: 2025-02-28XIAN UNIV OF TECH
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Patent Information

Application Number
CN202411724911.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2025-02-28
Estimated Expiration
2044-11-28

AI Technical Summary

Technical Problem

The existing KNN-based ceramics have problems with poor piezoelectric and mechanical properties during the preparation process, and the co-doping of multiple components leads to chemical heterogeneity and processing conditions sensitivity, which affects the repeatability and stability of industrial production.

Method used

Potassium sodium niobate-based ceramics were prepared by three-step sintering method. By optimizing the sintering kinetic parameters of pre-calcined powder and ceramic blocks, the grain size uniformity is improved, internal stress is suppressed, and grain growth is promoted from two-dimensional nucleation to diffusion control.

Benefits of technology

While ensuring the piezoelectric properties of ceramics, it significantly improves its mechanical properties, improves the long-term service reliability of KNN-based ceramics and their vibration sensors, and provides a new way to coordinate and improve electrical and mechanical properties.

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Abstract

The invention discloses a preparation method of high-performance lead-free piezoelectric potassium sodium niobate-based ceramic. The preparation method is specifically implemented according to the following steps: step 1, preparing pre-calcined powder; and 2, preparing the potassium-sodium niobate-based ceramic by adopting a three-step sintering method. The invention also discloses a high-performance lead-free piezoelectric potassium sodium niobate-based ceramic, which is prepared by weighing and mixing analytically pure Na2CO3, K2CO3, Nb2O5, Sb2O3, Bi2O3, ZrO2 and CaCO3 according to the stoichiometric ratio of 0.957: 0.48: Na: 0.52: Nb2O5: 0.96: Sb: 0.04: O < 3 >-0.04: Bi: 0.5: Na: 0.5: ZrO < 3 >-0.003: CaZrO < 3 >. The invention solves the problem of low piezoelectric and mechanical properties of the existing method for preparing the KNN-based ceramic.
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Citation Information

Patent Citations

  • Calcium zirconate and tantalum doped potassium sodium niobate-based piezoelectric ceramic and preparation method and application thereof

    CN111072385A

  • Potassium-sodium niobate-based leadless piezoelectric ceramic as well as preparation method and application thereof

    CN114262228A