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Micro driver of piezoelectric fiber composite material for pipeline and fabrication method of micro driver

A piezoelectric fiber and composite material technology, 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: 2018-09-07
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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  • Micro driver of piezoelectric fiber composite material for pipeline and fabrication method of micro driver
  • Micro driver of piezoelectric fiber composite material for pipeline and fabrication method of micro driver
  • Micro driver of piezoelectric fiber composite material for pipeline and fabrication method of micro driver

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, which consists of 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 interdigital electrode layer attached to the outer surface of the adhesive film layer. The pressure-sensitive adhesive is a thermoplastic pressure-sensitive adhesive, and polyamide (PA) hot-melt adhesive is used in this embodiment, 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 micro driver of a piezoelectric fiber composite material for a pipeline and a fabrication method of the micro driver. The micro driver comprises a piezoelectric fiber layer,glue film layers and an interdigital electrode layer, wherein the piezoelectric fiber layer comprises piezoelectric ceramic fibers which are laminated, two adjacent ceramic fibers are pasted by pressure-sensitive glue, the glue film layers are coated on an upper surface and a lower surface of the piezoelectric fiber layer, and the interdigital electrode layer is attached onto an outer surface ofthe glue film layer. Compared with the prior part, the micro driver has the advantages that relatively high piezoelectric performance is maintained, the micro driver is provided with the piezoelectricfiber composite material layer which has relatively high flexibility and is difficult to crack and damage during the installation and deformation process, the problem that a sensor is damaged due toinsufficient flexibility of resin matrix used on a large-curvature surface of a conventional epoxy resin material can be solved, and meanwhile, relatively high piezoelectric driving force can be increased.

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 Applications(China)
IPC IPC(8): H01L41/083H01L41/09H01L41/277H10N30/50H10N30/057H10N30/20
CPCH10N30/2047H10N30/50H10N30/057
Inventor 李文晓李素贞袁玮鸿
Owner TONGJI UNIV
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