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Longitudinal gradient short-fiber piezoelectric composite material and preparation method thereof

A piezoelectric composite material and piezoelectric composite technology, which are applied in the manufacturing/assembly of piezoelectric/electrostrictive devices, and the selection of device materials. It can solve the problems of piezoelectric fiber polarization dead zone and other problems, and achieve accurate and scalable structural dimensions. Control, uniform polarization, complete polarization effect

Active Publication Date: 2018-01-09
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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  • Longitudinal gradient short-fiber piezoelectric composite material and preparation method thereof
  • Longitudinal gradient short-fiber piezoelectric composite material and preparation method thereof
  • Longitudinal gradient short-fiber piezoelectric composite material and preparation method thereof

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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 comprises an interdigital electrode and a piezoelectric fiber composite layer, wherein the piezoelectric fiber composite layer is arranged between an upper electrode and a lower electrode of the interdigital electrode and comprises a plurality short-fiber piezoelectric composite units, the plurality of short-fiber piezoelectric composite units are sequentially pasted along an axial direction, the axial lengths of the plurality of short-fiber piezoelectric composite units are changed in a gradient way, and each short-fiber piezoelectriccomposite unit comprises a plurality of polarization short piezoelectric fibers and a plurality of polymer fibers. Polarization is completed before package of the longitudinal gradient short-fiber piezoelectric composite material, the polarization is complete and uniform, the problem of polarization dead zone is prevented, and meanwhile, the adaptability of a non-planar structure is improved. According to the preparation method of the longitudinal gradient short-fiber piezoelectric composite material, the longitudinal gradient short-fiber piezoelectric composite material is prepared, the structural size of the composite material is accurately controlled, and series and mass production of the piezoelectric composite material in structure and performance are easily achieved.

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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IPC IPC(8): H01L41/16H01L41/22H01L41/37
Inventor 杨雄王锋付争兵丁瑜杜军
Owner HUBEI ENG UNIV
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