Integrated asymmetric sandwich structure lead-free piezoelectric ceramic and preparation method thereof

Through the preparation method of integrated asymmetric sandwich structure, the problem of difficult to balance the mechanical properties and piezoelectric properties of lead-free piezoelectric ceramic materials is solved, and ceramic materials with high fracture toughness and wide temperature zone stability are achieved, which are suitable for large-scale industrial production.

CN119698225AInactive Publication Date: 2025-03-25GUILIN UNIV OF ELECTRONIC TECH
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Patent Information

Application Number
CN202411765600.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-04
Publication Date
2025-03-25
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing lead-free piezoelectric ceramic materials are difficult to balance between mechanical properties and piezoelectric properties, and have poor temperature stability, resulting in problems of deterioration in complex environments and low reliability.

Method used

The preparation method of integrated asymmetric sandwich structure is adopted, and a variety of composite structure asymmetric sandwich structures are formed through the specific composition and proportion of outer layer one, outer layer two and intermediate layer (1:1:1), combined with the pressing and sintering process, to form a variety of composite structure asymmetric sandwich structures to improve the mechanical properties and piezoelectric properties of the ceramics.

Benefits of technology

It achieves high fracture toughness, excellent piezoelectric properties and wide temperature zone stability of ceramic materials, stable performance and low cost, and is suitable for large-scale industrial production.

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Abstract

The invention relates to the technical field of ceramic materials, in particular to an integrated asymmetric sandwich structure leadless piezoelectric ceramic and a preparation method thereof.The prepared integrated asymmetric sandwich structure leadless piezoelectric ceramic material is of a 1-3 composite structure, a 0-3 composite structure and a 2-2 layered composite structure. The composite structure simultaneously generates an interface diffusion gradient composition and a gradient structure, so that the mechanical property, the piezoelectric property and the temperature stability are effectively improved. According to experimental measurement, the product has very excellent fracture toughness, piezoelectric property and wide temperature range stability, the fracture toughness KIC is 4.1 MPa.m < 1 / 2 >, the piezoelectric constant d33 is 206pC / N, d33 / d33 is lower than 10% within the temperature range of 25-262 DEG C, the performance is stable, the cost is low, and the ceramic material is suitable for large-scale industrial production, so that the problems that the mechanical property and the piezoelectric property of an existing ceramic material cannot be considered at the same time, and the ceramic material is not suitable for large-scale industrial production are solved. And the temperature stability is poor.
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