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Piezoelectric ceramic with piezoelectric coefficient of d36 and preparation method thereof

A piezoelectric ceramic and piezoelectric coefficient technology, applied in the field of piezoelectric ceramics, can solve the problems of inability to produce, restricting industrial application, poor mechanical properties, etc.

Inactive Publication Date: 2015-07-29
PEKING UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, in the past ten years, d 36 mode has not attracted much interest from the industry
The main reason is d 36 mode can only be achieved in single crystals with very few special cuts, and ceramics cannot produce d due to their symmetry limitations. 36 model
The preparation cost of single crystal is high, it is difficult to form large pieces, and its mechanical properties are poor, which seriously restricts the d 36 Patterns for Industrial Applications

Method used

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  • Piezoelectric ceramic with piezoelectric coefficient of d36 and preparation method thereof
  • Piezoelectric ceramic with piezoelectric coefficient of d36 and preparation method thereof
  • Piezoelectric ceramic with piezoelectric coefficient of d36 and preparation method thereof

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with specific examples, but the scope of the present invention is not limited in any way.

[0038] see figure 1 , follow the steps below to generate the piezoelectric coefficient d in the piezoelectric ceramic 36 :

[0039] (1) if figure 1 As shown in a), the polarized piezoelectric ceramic material is cut into a cube of a×a×a, the polarization direction is as shown, and its coordinate system is x 1 x 2 x 3 . The cube meets international standards for compression test pieces.

[0040] (2) if figure 1 As shown in b), for the cubic piezoelectric ceramic of a×a×a along x 1 direction for uniform compression. The compressive stress T is loaded quasi-statically from zero to 2 to 4 times the coercive stress of piezoelectric ceramics, and kept for about 24 hours, and then slowly unloaded to zero. Aging the compressed ceramics at room temperature for 2-3 days.

[0041] (3) if figure 1 As shown in mi...

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Abstract

The invention discloses a piezoelectric ceramic with a piezoelectric coefficient of d36 and a preparation method thereof. The preparation method comprises uniformly compressing a polarized cuboid piezoelectric ceramic, perpendicularly applying compressive stress onto two opposite surfaces parallel to a polarization direction, and ageing the compressed ceramic at room temperature for 2-3 days, cutting the aged ceramic in a manner of Z*t+-45 degrees to obtain the piezoelectric ceramic with the piezoelectric coefficient of d36 in a local coordinate system, namely, applying an electric field E3 in a direction parallel to the polarization direction so that the piezoelectric ceramic can generate shear strain S6 in the surfaces perpendicular to the polarization direction; or, applying a shear stress T6 on the surfaces perpendicular to the polarization direction so that the piezoelectric ceramic can generate electric displacement D3 on an electrode surface perpendicular to the polarization direction. The piezoelectric ceramic with the piezoelectric coefficient of d36 and the preparation method thereof are expected to promote scientific study and industrial application of a d36 mode.

Description

technical field [0001] The invention belongs to the technical field of intelligent materials, in particular to a method for generating piezoelectric coefficient d in piezoelectric ceramics. 36 method and the piezoelectric ceramics prepared therefrom. Background technique [0002] Piezoelectric materials are widely used in the preparation of various actuators, sensors and transducers due to their excellent electromechanical coupling properties. d of piezoelectric material 33 mode is currently the most widely used piezoelectric mode, and most of the piezoelectric devices on the market are based on d 33 model. Various types based on d 31 (or d 32 ) The application of the mode is also emerging in an endless stream, such as based on d 31 Mode energy recovery device. whether d 33 still d 31 mode, the material is stretched and deformed. In some special fields, people often hope to produce shear deformation. For example, in the field of structural health monitoring, wheth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/187H01L41/333H01L41/338C04B35/491H10N30/853H10N30/084H10N30/088
Inventor 李法新苗鸿臣
Owner PEKING UNIV
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