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A flexural piezoelectric composite material

A flexoelectric and composite material technology, applied in the direction of material selection for piezoelectric devices or electrostrictive devices, device material selection, etc., can solve complex structure, small apparent piezoelectric response, cumbersome preparation process, etc. question

Active Publication Date: 2017-12-22
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it has been proved feasible in experiments that there are two types of flexoelectric materials. The first is a pyramid-like structure of flexoelectric composite materials, which can convert external forces into corresponding strain gradients and generate flexoelectricity. effect, thus exhibiting an apparent piezoelectric response, however, the apparent piezoelectric response produced by this composite material is small
The second type of flexural voltage-electric composite material can produce a large strain gradient, and also has a good flexural voltage-to-electricity conversion efficiency, but the structure of the curved flexural voltage-electric composite material is complicated, and the preparation process is cumbersome.
Therefore, these two materials are greatly limited in practical applications.

Method used

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  • A flexural piezoelectric composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Preparation of 0.92Na by traditional solid-phase synthesis 1 / 2 Bi 1 / 2 TiO3 -0.08BaTiO 3 Ceramics: a certain proportion of Bi 2 o 3 、Na 2 CO 3 、BaCO 3 、TiO 2 (Analytical grade, Sinopharm Group) was added into alcohol and ball milled for 6-8 hours, dried, and synthesized at 850°C for 2 hours. Then, ball mill the synthesized powder, add appropriate binder, and press it into a disc with a diameter of 25.4mm. After sintering at 1180-1200°C for 1 hour, a ceramic sheet with a diameter of about 20mm is obtained. The ceramic sheet is ground on both sides, and gold electrodes are plated on both surfaces by ion sputtering, and then placed on a flat substrate, and an external force is applied to the sample with a spherical indenter with a diameter of 6mm. ZJ-6A quasi-static d 33 Instrument measurement, the apparent piezoelectric properties of 2 ~ 3pC / N.

Embodiment 2

[0034] BaTiO prepared by traditional solid-phase synthesis 3 Ceramics, that is, a certain amount of BaCO according to the chemical formula 3 and TiO 2 (Analytical grade, Sinopharm Group) was mixed with alcohol ball milled for 6 hours, dried, and synthesized at 1200°C for 2 hours. Then the synthesized powder was ball-milled, added an appropriate binder, and pressed into a disc with a diameter of 25.4mm. After plastic discharge, it was kept at 1300°C for 2 hours and sintered to obtain a ceramic sheet with a diameter of about 21mm. Grind both sides of the ceramic sheet to a thickness of about 0.5mm, plate gold electrodes on both surfaces by ion sputtering, apply an external force to the sample with a spherical indenter with a diameter of 6mm, and use ZJ-6A quasi-static d 33 Instrument measurement, the apparent piezoelectric performance of 80 ~ 100pC / N.

Embodiment 3

[0036] Using the purchased soft-doped lead zirconate titanate ferroelectric ceramics (PZT-51) (Zibo Bailing Functional Ceramics Co., Ltd.), the ceramics were ground on both sides (diameter 25mm, thickness 0.5mm), and silver electrodes were prepared on both sides. On the flat substrate, use a spherical indenter with a diameter of 6mm to apply external force to the sample, and use ZJ-6A quasi-static d 33 Instrument measurement, the apparent piezoelectric properties of 10 ~ 50pC / N.

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Abstract

A flexible piezoelectric composite material, including an indenter, a dielectric material, and a support plate that are stacked in sequence; the contact area between the indenter and the dielectric material and the contact between the dielectric material and the support plate Different areas, the surface of the dielectric material on the contact side with the indenter and the surface of the dielectric material on the contact side with the support plate are coated with electrode material, and the dielectric material is in the shape of a sheet. This application applies pressure to the flexural electrical composite material through the indenter. Due to the structure of the composite material, the force on both sides of the material is asymmetrical, and the dielectric material will have a relatively strong strain gradient near the stress point, resulting in flexoelectric effect. And then show the apparent piezoelectric effect.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a flexural piezoelectric composite material. Background technique [0002] Piezoelectric material is a functional material that can produce a polarization response (forward piezoelectric effect) when subjected to pressure or a strain response (inverse piezoelectric effect) under an electric field, and usually exists in a crystal structure without a center of symmetry. Piezoelectric materials can realize the conversion between mechanical energy and electrical energy. Based on this feature, piezoelectric materials can be applied to the preparation of devices such as sensors, drivers, transducers, and energy recovery. Piezoelectric materials widely used at present are lead-containing piezoelectric ceramic materials, such as lead zirconate titanate-based piezoelectric ceramic materials. This kind of lead-containing piezoelectric ceramic material has good piezoelectric ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/18
Inventor 初宝进周万丰潘祺章小同陈攀
Owner UNIV OF SCI & TECH OF CHINA
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