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A kind of shear piezoelectric composite material

A piezoelectric composite material, shear type technology, applied in the direction of material selection for piezoelectric devices or electrostrictive devices, device material selection, etc., can solve problems such as endangering personnel safety, high polarization voltage, hidden dangers, etc. Achieving the effects of wide adjustment range, reduced polarization voltage, and high integration

Active Publication Date: 2018-06-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure needs to apply a higher polarization voltage; on the one hand, the use of a higher polarization voltage puts forward higher requirements on the polarization equipment, on the other hand, it will also bring certain hidden dangers, endangering the safety of personnel

Method used

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  • A kind of shear piezoelectric composite material
  • A kind of shear piezoelectric composite material
  • A kind of shear piezoelectric composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The lead zirconate titanate piezoelectric ceramics are processed into slices of 30mm×10mm×0.5mm. After washing and drying, silver paste is applied on the upper and lower surfaces to make electrodes, and a polarization voltage of 1.5kV is applied to obtain 3kV / mm in the thickness direction. The polarizing electric field makes it polarized along the thickness direction. It is cut by a cutting machine, and a piezoelectric ceramic fiber array with fiber width and fiber spacing equal to 0.5 mm is obtained by selecting blades of appropriate thickness and setting the cutting distance. Fill the array with E-51 epoxy resin, and after curing, obtain a 30mm×10mm×0.18mm lead zirconate titanate / E-51 epoxy resin composite layer 3 through thinning treatment. In this process, the upper and lower surfaces of the original piezoelectric ceramics The coated silver paste electrode has been worn away. The interdigital electrodes were printed on the polyimide film by screen printing. The dist...

Embodiment 2

[0036] The pre-fired lead zirconate titanate powder and carbon black powder are mixed with the binder, plasticizer, dispersant and solvent, respectively, and made into sheet-shaped green bodies by the casting method. After alternate stacking, they are pressed, decarburized and combined. After sintering, a matrix of lead zirconate titanate sheets is formed. Fill the matrix with 711 epoxy resin, and cut to obtain a lead zirconate titanate / E-51 epoxy resin composite layer after curing. In the above process, by controlling the green thickness, cutting distance and other parameters, the size of the lead zirconate titanate / E-51 epoxy resin composite layer finally obtained is 10mm×5mm×0.2mm, and the fiber width and fiber spacing are both 0.4mm. The interdigital electrodes are printed on the upper and lower sides of the lead zirconate titanate / 711 epoxy resin composite layer by screen printing. The distance between the positive and negative fingers of the interdigital electrode is 0.4...

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Abstract

A shear type piezoelectric composite material, the outermost two layers of the composite material structure are flexible insulating films, the middle layer is a piezoelectric phase / epoxy resin composite layer, and interdigitated electrodes are placed between the middle layer and the flexible insulating film; The positive and negative fingers of the interdigitated electrodes are arranged alternately and equidistantly, and the upper and lower two interdigitated electrodes are mirror-symmetrical and aligned; the fingers of the interdigitated electrodes are aligned with the piezoelectric phase / The piezoelectric phases of the epoxy resin composite layer are parallel, and the electrode fingers are located on the upper and lower sides of the edge of the piezoelectric phase and the epoxy resin bonding surface; the polarization direction of the piezoelectric phase is a direction perpendicular to the plane of the composite layer. The invention provides a sheet-shaped piezoelectric composite material with thin thickness, compact structure, capable of fitting curved surface structures and realizing a certain degree of flexible deformation, which is suitable for making drivers, sensors and the like.

Description

Technical field [0001] The invention relates to a shear type piezoelectric composite material. Background technique [0002] In the past decade or so, various adaptive structures with structural health self-diagnosis, environmental self-adaptation, self-monitoring and other functions have become research hotspots. This type of composite structure integrating main structure, sensor and driver is widely used Fields such as structural inspection, energy harvesting and vibration control. Piezoelectric ceramics have become the most widely used driver material in adaptive structures due to their high energy density, fast electromechanical response conversion, and large driving force. [0003] Piezoelectric ceramics deform under the action of an external electric field, and are a functional material that can realize the conversion of electrical energy and mechanical energy. The direction of deformation of piezoelectric ceramics is closely related to the direction of the applied electric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/18H10N30/85
Inventor 张斗陈子琪周科朝朱松陈超
Owner CENT SOUTH UNIV
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