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A longitudinal gradient short fiber piezoelectric composite material and its preparation method

A piezoelectric composite material and piezoelectric composite technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, device material selection, etc., can solve problems such as the polarization dead zone of piezoelectric fibers, and achieve accurate and reliable structural dimensions. control, low requirements, simple and easy process

Active Publication Date: 2020-06-30
HUBEI ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a longitudinally gradient short-fiber piezoelectric composite material, aiming to improve the problem that piezoelectric fibers are prone to polarization dead zones during the polarization process, and at the same time enhance the adaptability to non-planar structures

Method used

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  • A longitudinal gradient short fiber piezoelectric composite material and its preparation method
  • A longitudinal gradient short fiber piezoelectric composite material and its preparation method
  • A longitudinal gradient short fiber piezoelectric composite material and its preparation method

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preparation example Construction

[0037] Please refer to figure 2 and image 3 , the embodiment of the present invention also provides a method for preparing a longitudinal gradient short fiber piezoelectric composite material, comprising the following steps:

[0038] S1. A piezoelectric composite structure 5 is obtained by alternately stacking multiple piezoelectric thin layers 11 and multiple polymer thin layers 22 , and each polymer thin layer 22 is connected to a piezoelectric thin layer 11 on both sides.

[0039] For the convenience of subsequent description, the length direction along the plane where the piezoelectric thin layer 11 is located is defined as the first direction, and the width direction along the plane where the piezoelectric thin layer 11 is located is defined as the second direction.

[0040] Specifically, a plurality of piezoelectric thin layers 11 and a plurality of polymer thin layers 22 are spliced ​​alternately, and the piezoelectric thin layers 11 are located on the top and bottom...

Embodiment 1

[0053] This embodiment provides a method for preparing a longitudinally gradient short fiber piezoelectric composite material. PZT is used as the piezoelectric phase and epoxy resin is used as the polymer phase. The method of the present invention is used to prepare the longitudinally gradient short fiber reinforced piezoelectric composite material. The specific process as follows:

[0054] 1. Using PZT ceramics and epoxy resin as raw materials, the lamination-cutting method is used to prepare such as figure 2 The piezoelectric composite structure 5 shown in the above, wherein the number of piezoelectric thin layers 11 is 9, and the thickness is 0.3 mm; the number of polymer thin layers 22 is 8, and the thickness is 0.2 mm; the thickness of the piezoelectric composite structure 5 is The sum of the thicknesses of the electric thin layer 11 and the polymer thin layer 22 is 4.3 mm; the length and width of the piezoelectric fiber composite structure 5 and the piezoelectric thin l...

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Abstract

The invention discloses a longitudinal gradient short fiber piezoelectric composite material and a preparation method thereof, and relates to the technical field of material preparation. The longitudinal gradient short fiber piezoelectric composite material includes an interdigital electrode and a piezoelectric fiber composite layer located between the upper and lower electrodes of the interdigital electrode. The piezoelectric fiber composite layer includes a plurality of short fiber piezoelectric composites bonded sequentially along the axial direction. unit, the axial length of multiple short fiber piezoelectric composite units changes in a gradient manner, and each short fiber piezoelectric composite unit includes multiple polarized short piezoelectric fibers and multiple polymer fibers. It completes the polarization before packaging, and the polarization is complete and uniform without the problem of polarization "dead zone". It also enhances the adaptability to non-planar structures. This method for preparing the longitudinal gradient short fiber piezoelectric composite material prepares the above longitudinal gradient short fiber piezoelectric composite material. The structure size of the composite material is accurately controllable, and it is easy to realize serialization and batch preparation of the structure and performance of the piezoelectric fiber composite material. .

Description

technical field [0001] The invention relates to the technical field of material preparation, and in particular to a longitudinal gradient short fiber piezoelectric composite material and a preparation method thereof. Background technique [0002] Piezoelectric composite materials are a kind of functional composite materials based on the mutual coupling between electrical energy and mechanical energy. According to the different composite principles and structures, there are many types. Piezoelectric fiber composite materials are composed of piezoelectric fibers and polymer fibers. Combining the excellent piezoelectric performance of piezoelectric crystal materials and the flexibility of polymer fibers, it overcomes the shortcomings of high brittleness and poor flexibility of piezoelectric crystal materials, and has the characteristics of outstanding unidirectional performance and excellent designability. It is widely used in many fields such as sensing, actuation, structural ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/16H01L41/22H01L41/37H10N30/01H10N30/092
Inventor 杨雄王锋付争兵丁瑜杜军
Owner HUBEI ENG UNIV
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