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Ferroelectric single crystal/epoxy 2-2 structure and 2-2 structure composite materials reinforced by stress plates

A composite material and ferroelectric single crystal technology, which is applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problem of large equivalent noise and sound pressure , Instable performance, complex processing process and other problems, to achieve the effect of improving hydrostatic piezoelectric performance

Inactive Publication Date: 2015-01-21
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

smaller d h and g h It will inevitably lead to its hydrostatic pressure sensitivity figure of merit d h * g h drop, so the hydrophone made of traditional piezoelectric materials has the disadvantages of low sensitivity and high equivalent noise sound pressure
In order to solve this problem, in the past, porous ceramics and composite materials with 3-3 structure were used to improve the hydrostatic piezoelectric performance of piezoelectric materials, but these materials generally have the disadvantages of complex processing and unstable performance.

Method used

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  • Ferroelectric single crystal/epoxy 2-2 structure and 2-2 structure composite materials reinforced by stress plates
  • Ferroelectric single crystal/epoxy 2-2 structure and 2-2 structure composite materials reinforced by stress plates
  • Ferroelectric single crystal/epoxy 2-2 structure and 2-2 structure composite materials reinforced by stress plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The single crystal material used in this embodiment is the trigonal phase Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 Binary ferroelectric single crystal. The crystals were oriented by the Laue diffraction method, and [011], [100] and direction, and then cut into [011] oriented square pieces of 10×10×2mm for later use. Fix the sample on the sample stage of the diamond automatic dicing machine, and then use a 0.350mm diamond knife to cut the sample along the direction, the cutting depth is 2.5mm, by adjusting the cutting step to 0.58mm, 0.64mm, 0.70mm, 0.80mm, 0.87mm, 0.95mm and 1.03mm respectively, the single crystal integral number is 40% to 66%. 7 array samples. After the cutting is completed, the intact array sample is obtained, and then epoxy resin (EPO-TEK301 from Epoxy Technology Company of the United States, the mass ratio of resin / curing agent is 100:25) is poured into the sample, so that the resin is filled into the inside of the cut, at room temperature After curi...

Embodiment 2

[0044] This embodiment uses the Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 Ferroelectric single crystals were fabricated into 2-2 composites. The orientation method of the single crystal and the processing technology of the 2-2 composite material are the same as in Example 1, the volume fraction of the single crystal is set to 50%, and the polymer filled in the composite material is also the same as in Example 1. Table 3 shows the basic performance test results of single crystal 2-2 composite materials with different components, and compares them with the performance of pure PMN-PT single crystal. It can be seen from Table 3 that compared with pure single crystal, the single crystal 2-2 composite materials of each component have higher electromechanical coupling coefficient and lower acoustic impedance. Figure 4 That is to say, the designer of the present invention uses the isostatic pressure test system of Xi'an Jiaotong University to measure the variation of the charge released per...

Embodiment 3

[0050] From the 2-2 composite material of the monoclinic phase and the 2-2 composite material of the trigonal phase away from the phase boundary in Example 2, lead the wires out from the upper and lower electrode surfaces, and then add a 0.3mm thick epoxy-based copper-clad laminate for each. Reinforcement yields panel-reinforced 2-2 structure single crystal composites. The epoxy conductive adhesive is used to bond the 2-2 composite material and the stress plate, and the sample can be tested after curing at room temperature for 24 hours. The method for testing and analyzing the hydrostatic piezoelectric performance of the 2-2 structure single crystal composite material strengthened by the stress plate is the same as that in Example 1. Figure 5 and Figure 6 The graphs of the release charge per unit area of ​​the monoclinic phase and the stress plate-strengthened 2-2 structure far away from the phase boundary trigonal phase as a function of pressure are given respectively. Ac...

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Abstract

The invention relates to a ferroelectric single crystal / epoxy 2-2 structure, 2-2 structure composite materials reinforced by stress plates, and preparation methods of the ferroelectric single crystal / epoxy 2-2 structure and the 2-2 structure composite materials reinforced by the stress plates. The 2-2 structure composite materials are composed of a Relaxor-PbTiO3 ferroelectric single crystal of a composite perovskite structure and polymer. The width of the section of the 2-2 composite material single crystal wafer obtained by a cutting-filling method is 200MUm-1mm, and the aspect ratio of the 2-2 composite material mono-crystal is 2-5. The single crystal wafer with the section width being 200Mum-1mm and epoxy resin are arranged alternately. The 2-2 structure composite materials reinforced by the stress plates are obtained when the upper electrode faces and the lower electrode faces of the 2-2 structure composite materials are reinforced by panels. The orderly-composite piezoelectric materials which are of 2-2 array structures and reinforced by the panels can be applied to underwater acoustic transducers.

Description

technical field [0001] The invention belongs to the technical field of ferroelectric single crystal material and its manufacture, and relates to a 2-2 structure composite material with a binary ferroelectric single crystal / epoxy 2-2 structure and stress plate reinforcement and a preparation method thereof. Background technique [0002] A hydrophone is a transducer that converts an acoustic signal into an electrical signal. It is used to receive an acoustic signal in water, and it can also be called a receiving transducer. Hydrophones are widely used in underwater communication, detection, target positioning, tracking, etc., and are important components of sonar. For example, in reconnaissance systems and UUV (unmanned underwater vehicle) systems, hydrophones are an important part of them . Underwater detection, identification, communication, as well as marine environment monitoring and the development of marine resources are inseparable from hydrophones. In hydrophone appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187H01L41/39
Inventor 李丽丽张树君徐卓耿学仓汶飞马明李振荣
Owner XI AN JIAOTONG UNIV
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