A piezoelectric fiber composite material micro-driver for pipelines and its preparation method

A technology of piezoelectric fibers and composite materials, applied in piezoelectric devices/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve problems such as the influence of driving effects

Active Publication Date: 2020-10-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the piezoelectric device prepared by this process can retain the sensing performance of the original piezoelectric ceramic, its driving effect is greatly affected due to the small cross-sectional size.

Method used

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  • A piezoelectric fiber composite material micro-driver for pipelines and its preparation method
  • A piezoelectric fiber composite material micro-driver for pipelines and its preparation method
  • A piezoelectric fiber composite material micro-driver for pipelines and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A piezoelectric fiber composite micro-driver for pipelines, the structure of which is as follows Figure 1-3 As shown, it includes: piezoelectric fiber layer 3, which is composed of laminated piezoelectric ceramic fibers 4, and two adjacent ceramic fibers 4 are bonded by pressure-sensitive adhesive 5, wherein the piezoelectric ceramic fibers are made of 1 mm thick pressure-sensitive adhesive. The electric ceramic sheet is cut into 1*0.5mm rectangular cross-section macrofiber. The pressure-sensitive adhesive 5 used is a thermoplastic pressure-sensitive adhesive. What is used in this embodiment is ethylene-vinyl acetate polymer resin (EVA), with an elastic modulus of 80 MPa, an ultimate strain rate of 200%, and a softening temperature of 90°C. It has good elasticity, flexibility, waterproof and corrosion resistance. Correspondingly, by utilizing the softening property of EVA at 90°C, the complex thermal curing process after casting is abandoned during the preparation, an...

Embodiment 2

[0039] A piezoelectric fiber composite micro-driver for pipelines, comprising laminated piezoelectric ceramic fibers, a piezoelectric fiber layer bonded by pressure-sensitive adhesive between two adjacent ceramic fibers, coated on the piezoelectric fiber layer The epoxy structural adhesive film layer containing dicyandiamide curing agent on the upper and lower surfaces; the interdigitated electrode layer attached to the outer surface of the adhesive film layer. The pressure-sensitive adhesive is a thermoplastic pressure-sensitive adhesive, and polyethylene terephthalate (PET) hot-melt adhesive is used in this embodiment, the strain rate at break is >200%, and the peel strength at 180°C is >4N cm. Softening temperature>80℃. The interdigitated electrode layer is made of polyimide film, and the inner side of the polyimide film is engraved with copper interdigitated electrodes.

[0040] The preparation method of the piezoelectric fiber composite material micro-driver for the pipe...

Embodiment 3

[0046]A piezoelectric fiber composite micro-driver for pipelines, comprising laminated piezoelectric ceramic fibers, a piezoelectric fiber layer bonded by pressure-sensitive adhesive between two adjacent ceramic fibers, coated on the piezoelectric fiber layer The epoxy structural adhesive film layer containing dicyandiamide curing agent on the upper and lower surfaces; the interdigitated electrode layer attached to the outer surface of the adhesive film layer. The pressure-sensitive adhesive is a thermoplastic pressure-sensitive adhesive. In this embodiment, polyamide (PA) hot-melt adhesive is used, with tensile strain rate at break>200%, peel strength at 180°C>4N·cm, and softening temperature at 110°C. The interdigitated electrode layer is made of polyimide film, and the inner side of the polyimide film is engraved with copper interdigitated electrodes. Its preparation method is with embodiment 2.

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Abstract

The invention relates to a piezoelectric fiber composite material micro-driver for pipelines and a preparation method thereof. The micro-driver includes a piezoelectric fiber layer, which is composed of laminated piezoelectric ceramic fibers, and two adjacent pieces of ceramic fibers are bonded by pressure-sensitive adhesives. , the adhesive film layer is coated on the upper and lower surfaces of the piezoelectric fiber layer; the interdigitated electrode layer is attached to the outer surface of the adhesive film layer. Compared with the prior art, the present invention retains strong piezoelectric properties, and at the same time has high toughness, and is not easy to crack and damage the piezoelectric fiber composite material layer in the process of installation deformation, which can solve the problem of conventional epoxy resin materials in large When used on a curved surface, the sensor itself is damaged due to insufficient toughness of the resin matrix, and at the same time, a higher piezoelectric driving force can be improved.

Description

technical field [0001] The invention belongs to the field of intelligent composite materials, and in particular relates to a piezoelectric fiber composite material micro-driver for pipelines and a preparation method thereof. Background technique [0002] As one of the five modern modes of transportation, pipeline transportation plays a very important role in resource allocation and communication between regions. Investment in pipelines also occupies a significant proportion of the total project investment. However, pipeline accidents have occurred frequently recently, causing serious harm to public safety, economy and environment. From an objective point of view, the large span of the pipeline covers a wide range, the service conditions are harsh, the damage is relatively localized, it is difficult to observe and diagnose, and it is very difficult to detect its structural health. The pipeline mainly bears static force (a small amount of environmental vibration), while hidd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/083H01L41/09H01L41/277
CPCH10N30/2047H10N30/50H10N30/057
Inventor 李文晓李素贞袁玮鸿
Owner TONGJI UNIV
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