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Deflection voltage electrical composite

A flexoelectric and composite material technology, which is applied in the direction of material selection and device material selection for piezoelectric devices or electrostrictive devices, and can solve problems such as complex structures, material limitations, and cumbersome preparation processes

Active Publication Date: 2015-12-09
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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  • Deflection voltage electrical composite

Examples

Experimental program
Comparison scheme
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

The invention provides a deflection voltage electrical composite which comprises a press head, a dielectric material and a support plate, wherein the press head, the dielectric material and the support plate are successively superimposed. The contact area of the press head and the dielectric material is different from the contact area of the dielectric material and the support plate. Electrode materials are coated on the surface of the side, which contacts the press head, of the dielectric material and the surface of the side, which contacts the support plate, of the dielectric material. The dielectric material is sheet-shaped. According to the invention, the press head presses the deflection voltage electrical composite; due to the structure of the composite, stress on both sides of the composite are asymmetric; strong strain gradient is generated near a force bearing point of the dielectric material; a deflection electrical effect is generated; and an apparent piezoelectric effect is shown.

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 Applications(China)
IPC IPC(8): H01L41/18H10N30/85
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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