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Preparation method of shearing type piezoelectric fiber composite material

A piezoelectric fiber, composite material technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, material selection for piezoelectric devices or electrostrictive devices, device material selection, etc., can solve difficult practical applications and other problems, to achieve the effect of clear piezoelectric fiber, simple process flow, and reduced polarization voltage

Active Publication Date: 2018-04-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since a whole piece of piezoelectric ceramic is used as the raw material, this structure ensures the consistency of the polarization direction of the ceramic fiber in the fiber length direction. However, a very high polarization voltage is required to polarize the piezoelectric ceramic in the fiber length direction. Therefore, this structure is only suitable for preparing small-sized samples in the laboratory, and it is difficult for practical application

Method used

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  • Preparation method of shearing type piezoelectric fiber composite material
  • Preparation method of shearing type piezoelectric fiber composite material
  • Preparation method of shearing type piezoelectric fiber composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Polarize the PZT-5H piezoelectric ceramic sheet along the thickness direction at a dielectric strength of 2.5kV / mm and a temperature of 80°C for 20 minutes to obtain a lead zirconate titanate piezoelectric ceramic sheet polarized along the thickness direction; after polarization One side of the lead zirconate titanate piezoelectric ceramic sheet is cut with a blade with a thickness of 500 μm to form a plurality of piezoelectric fibers uniformly arranged. The width of the piezoelectric fiber is 690 μm and the thickness is 200 μm. It has fiber gaps, and the width of the fiber gaps is 530 μm.

[0058] Fill the epoxy resin (commodity code is Araldite 2020) in the fiber gap, and then solidify at a temperature of 40°C. After curing, the elastic modulus of the epoxy resin is 3.38GPa, and its Poisson's ratio is 0.27, so that the fiber gap is filled Piezoelectric fibers with epoxy resin.

[0059] The side of the lead zirconate titanate piezoelectric ceramic sheet opposite to th...

Embodiment 2

[0067] The preparation method was the same as in Example 1, except that the thickness of the piezoelectric fiber was 180 μm to obtain a shear-type piezoelectric fiber composite material, and the equivalent material parameters of the piezoelectric fiber composite material were obtained by numerical calculation.

Embodiment 3

[0069] The preparation method was the same as in Example 1, except that the thickness of the piezoelectric fiber was 240 μm to obtain a shear-type piezoelectric fiber composite material, and the equivalent material parameters of the piezoelectric fiber composite material were obtained by numerical calculation.

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Abstract

The invention discloses a preparation method of a shearing type piezoelectric fiber composite material. The preparation method comprises the following steps of performing cutting on one surface of a lead zirconate titanate piezoelectric ceramic sheet polarized in the thickness direction to form uniformly arranged piezoelectric fibers; filling the fiber gaps with epoxy resin and performing curing to obtain piezoelectric fibers filled with epoxy resin; performing thinning on one surface, opposite to the cutting surface, of the lead zirconate titanate piezoelectric ceramic sheet to obtain a leadzirconate titanate piezoelectric ceramic-epoxy resin composite layer; enabling the upper and lower surfaces of the lead zirconate titanate piezoelectric ceramic-epoxy resin composite layer to be compounded with flexible interdigital electrodes by epoxy resin, wherein the flexible interdigital electrodes on the upper and lower surfaces are in mirror symmetry, and the finger parts of the flexible interdigital electrodes are parallel to the piezoelectric fibers; and performing curing on the epoxy resin. The method is simple in process, and the obtained piezoelectric fiber composite material has high overall performance and clear piezoelectric fibers, certain flexibility and bending deformation resistance, and high electrical performance, strain performance and driving performance.

Description

technical field [0001] The invention relates to the technical field of piezoelectric materials, in particular to a preparation method of a shear-type piezoelectric fiber composite material. Background technique [0002] Piezoelectric ceramics widely used at present and including d 33 Piezoelectric ceramic composite materials, including piezoelectric fiber composite materials, are based on the axial piezoelectric effect of piezoelectric ceramics, that is, the direction of the driving electric field acting on piezoelectric ceramics is parallel to the polarization direction of ceramics, and piezoelectric ceramics generate along the Polarization direction (d 33 ) or perpendicular to the polarization direction (d 31 ) deformation, such as Figure 21 shown. In addition to the axial piezoelectric effect, including PZT (piezoelectric ceramic transducer, lead zirconate titanate piezoelectric ceramics), BaTiO 3 Piezoelectric ceramic materials such as Piezoelectric ceramics also ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/08H01L41/18H01L41/37H10N30/00H10N30/092H10N30/85
CPCH10N30/852H10N30/092H10N30/702
Inventor 张斗袁晰王晓宇李林凌何德华高峰周科朝
Owner CENT SOUTH UNIV
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