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

A piezoelectric composite material, piezoelectric composite technology, applied in the direction of material selection for piezoelectric devices or electrostrictive devices, manufacturing/assembly of piezoelectric/electrostrictive devices, device material selection, etc., can solve the problem of pressure Problems such as the dead zone of electrical fiber polarization, to achieve the effect of complete and uniform polarization, enhanced adaptability, and low requirements

Active Publication Date: 2020-06-26
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 bidirectional gradient short-fiber piezoelectric composite material, aiming to improve the problem that the piezoelectric fiber is prone to polarization dead zone during the polarization process, and at the same time enhance the adaptability to non-planar structures

Method used

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

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preparation example Construction

[0040] Please refer to figure 2 and image 3 , the embodiment of the present invention also provides a method for preparing a bidirectional gradient short fiber piezoelectric composite material, comprising the following steps:

[0041] S1. Alternately stacking multiple piezoelectric thin layers 11 and multiple polymer thin layers 22 to obtain a piezoelectric composite structure 5. Both sides of each polymer thin layer 22 are respectively connected to a piezoelectric thin layer 11, and multiple The width of the piezoelectric thin layer 11 changes in a gradient.

[0042] 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.

[0043] Specifically, a plurality of piezoelectric thin layers 11 and a plurality of polymer thin layers 22 are splice...

Embodiment 1

[0056] This example provides a method for preparing a bidirectional gradient short fiber piezoelectric composite material, using PZT as the piezoelectric phase and epoxy resin as the polymer phase, and using the method of the present invention to prepare a bidirectional gradient short fiber reinforced piezoelectric composite material, the specific process as follows:

[0057] 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, the initial thickness of piezoelectric thin layers 11 is 0.2 mm, and the thickness increment is 0.05 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 all piezoelectric thin layers 11 and polymer thin layers 22, which is 5.2 mm; the thickness of the piezoe...

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Abstract

The invention discloses a bidirectional gradient short fiber piezoelectric composite material and a preparation method thereof, and relates to the technical field of material preparation. The bidirectional gradient short-fiber piezoelectric composite material includes interdigitated electrodes and a piezoelectric fiber composite layer. The piezoelectric fiber composite layer includes a plurality of short-fiber piezoelectric composite units connected in sequence along the axial direction, and a plurality of short-fiber piezoelectric composite units. The axial length changes in a gradient, and each short-fiber piezoelectric composite unit includes a plurality of polarized short piezoelectric fibers and a plurality of polymer fibers, and the width of the plurality of polarized short piezoelectric fibers in the splicing direction changes in a gradient. It completes the polarization before packaging, the polarization is complete and uniform without the problem of polarization "dead zone", and at the same time, it enhances the adaptability to non-planar structures. The structure size of the composite material obtained by the preparation method of the bidirectional gradient short-fiber piezoelectric composite material is accurate and controllable, and it is easy to realize serial 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 bidirectional 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): H01L41/18H01L41/193H01L41/37H01L41/45H10N30/85H10N30/092H10N30/098H10N30/857
CPCH10N30/852H10N30/857H10N30/092H10N30/098
Inventor 杨雄王锋付争兵丁瑜杜军
Owner HUBEI ENG UNIV
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