CN101304067A - Piezoelectricity composite material and preparation method thereof - Google Patents
Piezoelectricity composite material and preparation method thereof Download PDFInfo
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- CN101304067A CN101304067A CN 200810067783 CN200810067783A CN101304067A CN 101304067 A CN101304067 A CN 101304067A CN 200810067783 CN200810067783 CN 200810067783 CN 200810067783 A CN200810067783 A CN 200810067783A CN 101304067 A CN101304067 A CN 101304067A
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Abstract
The invention discloses a piezoelectric composite material and a preparation method thereof. The piezoelectric composite material comprises filling material and at least two layers of piezoelectric materials; based on the polarity of the piezoelectric materials in each layer, the piezoelectric materials in adjacent layers are arranged in reverse; the piezoelectric materials in each layer are arranged with three-dimensional communication; the filling material is arranged with one-dimensional communication; work face electrodes are respectively arranged on each work face of the piezoelectric composite material; in the section parallel to the work face of the piezoelectric composite material, the piezoelectric materials are communicated and arranged in the form of regular strip combination; the filling material is arranged in isolation. The product of the invention can be used for manufacturing multi-layer ultrasonic transducers and sensors, avoiding and solving the problem of inaccurate positioning of adjacent layers; besides, the process flow is simple with only two piezoelectric single-crystal cutting directions, thus saving processing time and cost.
Description
Technical field
The present invention relates to piezo-electricity composite material, in particular, a kind of multi-layer piezoelectric composite material and preparation method thereof.
Background technology
Ultrasonic transducer is widely used in biomedical image, diagnosis and treatment, industrial nondestructive testing (flaw detection) and aspect such as sonar under water.Ultrasonic transducer adopts the piezoelectric with piezoelectric effect usually, mechanical energy can be converted to electric energy, perhaps converts electrical energy into mechanical energy.Piezoelectric ultrasonic transducer can adopt the form mode of single or multiple lift.The multi-layer piezoelectric ultrasonic transducer adopts the polarised direction of adjacent layer opposite, and the mode by mechanical structure series connection and circuit structure parallel connection between each layer combines.Compare with the single layer structure of same thickness, the multi-layer piezoelectric ultrasonic transducer has the impedance with square proportional reduction of the number of plies, under given electric excitation signal condition, has mechanical response output with the proportional increase of the number of plies, simultaneously, by changing each layer thickness of sandwich construction, the multi-layer piezoelectric ultrasonic transducer has wideer frequency bandwidth response.
Usually be widely used in the piezoelectric crystal material of ultrasonic transducer, comprise that materials such as piezoelectric ceramic and piezoelectric monocrystal have high electromechanical coupling factor and dielectric constant, can effectively electric energy and mechanical energy be changed mutually, also easy and relevant circuit system carries out electronic match.Yet the very high acoustic impedance that piezoelectric crystal material has simultaneously often is difficult to mate well with the medium of low acoustic impedances such as tissue, water and air.Piezo-electricity composite material combines piezoelectric crystal material and polymeric material with certain volume or weight ratio and certain space structure distribution, form the new material of the advantage that has piezoelectric crystal material high tension performance and the impedance of polymeric material low acoustic concurrently.The piezo-electricity composite material piezoelectric property is very even, and acoustic impedance is very low, and is in light weight, can make bent type structure.The ultrasonic transducer of piezo-electricity composite material has very high electromechanical conversion efficiency, very wide frequency bandwidth, high sensitivity and signal to noise ratio.
The various combination mode of piezoelectric crystal and polymer is determining the characteristic that they are different in the piezo-electricity composite material.Under the given condition of piezoelectric crystal and combination of polymers ratio, their space combination structure is determining the performance of piezo-electricity composite material.According to the definition of Newnhan, piezo-electricity composite material can be classified according to the mode of communicating of piezoelectric crystal material and polymer.The basic thought of " connectedness " is: any in the mixture is to be interconnected on zero dimension, one dimension, two dimension or three-dimensional, thereby arbitrarily the connectedness of disperse and isolated particle is 0, and the medium that surrounds them is communicated with on three-dimensional.Form if mixture is piled up mutually by two kinds different " flat boards ", then the connectedness of system can be thought 2-2.Usually the mixture by two phase compositions has 10 kinds of mode of communicating, comprises 0-0,1-0,2-0,3-0,1-1,2-1,3-1,2-2,3-2,3-3.
The typical piezo-electricity composite material that is widely used is the 1-3 type.1-3 type composite material is made up of several column type piezoelectric crystal units that are aggregated the encirclement of thing material, 1-3 type piezo-electricity composite material is that the piezoelectric phase by one dimension connect is parallel in the polymer of three-dimensional communication and forms, piezoelectric crystal material in this material is only at one dimension connect, and polymeric material then is a three-dimensional communication.1-3 type composite material has extremely low lateral vibration pattern and higher electromechanical coupling factor.
Yet, in the process of making multilayer ultrasonic transducer, adopt typical 1-3 type piezo-electricity composite material can run into the problem of the mutual contraposition of adjacent layer.The inaccurate problem of the mutual contraposition of adjacent layer usually can greatly influence the performance of multilayer ultrasonic transducer, reduces the electromechanical coupling factor and the amplitude output signal of transducer, brings other unnecessary unwanted vibration mode simultaneously.Because each layer of the ultrasonic transducer of sandwich construction be processing respectively normally, so the whole accurately contraposition of maintenance adjacent layer guarantees simultaneously that also piezoelectric crystal column structure and the accurate contraposition of piezoelectric crystal column structure in the middle of the adjacent layer in each layer centre are very difficult in the process of processing multilayer ultrasonic transducer.
Therefore, there is defective in prior art, needs to improve.
Summary of the invention
Technical problem to be solved by this invention is because the fault of construction of multilayer 1-3 type piezo-electricity composite material causes in manufacture process the inaccurate problem of the mutual contraposition of adjacent layer
Technical scheme of the present invention is as follows:
A kind of piezo-electricity composite material, it comprises piezoelectric and filler; Wherein, it comprises two layers of piezoelectric material at least, and wherein, according to the polarity of each layer of piezo-electric material, the adjacent layer piezoelectric oppositely is provided with; Each layer of piezo-electric material three-dimensional communication is provided with, and described filler one dimension connect is provided with; Each working face at described piezo-electricity composite material is provided with the working face electrode respectively; In the cross section that is parallel to described piezo-electricity composite material working face, described piezoelectric is communicated with setting with the form of regular bar shaped combination, and described filler is isolated setting.
Described piezo-electricity composite material, wherein, the adjacent surface of each layer of piezo-electric material is provided with the adjacent surface electrode respectively.
Described piezo-electricity composite material wherein, respectively in the side of the described adjacent surface of each layer of piezo-electric material, is provided with the side electrode that is connected with the adjacent surface electrode of this layer of piezo-electric material.
Described piezo-electricity composite material, wherein, in the described regular bar shaped combination, described regular bar shaped comprise at least following shape one of them: rectangle, ellipse, triangle, arc; Described combination comprise at least following shape one of them: C shape, I shape, N shape, S shape, U-shaped, V-arrangement.
Described piezo-electricity composite material, wherein, described working face comprise at least following shape one of them: circle, ellipse, triangle, parallelogram.
Described piezo-electricity composite material, wherein, each layer of piezo-electric material shape is identical, and bonding setting adds up to account for 15% to 85% of cumulative volume.
A kind of preparation method of piezo-electricity composite material, it may further comprise the steps: A1, for two layers of piezoelectric material at least according to the polarity of each layer of piezo-electric material, oppositely is communicated with the adjacent layer piezoelectric is set; A2, in the polarised direction of piezoelectric, cutting connects at least two filling slots of each layer of piezo-electric material, to form the piezoelectric that adopts regular bar shaped combining form to be communicated with; A3, in each filling slot, filler is set; A4, at each working face of described piezo-electricity composite material, the working face electrode is set respectively.
Described preparation method wherein, in the steps A 1, is provided with the adjacent surface electrode respectively by the adjacent surface in each layer of piezo-electric material, oppositely is communicated with the adjacent layer piezoelectric is set; And steps A 1 is further comprising the steps of: respectively in the side of the described adjacent surface of each layer of piezo-electric material, the side electrode that is connected with the adjacent surface electrode of this layer of piezo-electric material is set.
Described preparation method, wherein, described filler has viscosity; And, in the steps A 1, adopt the bonding adjacent layer piezoelectric that is provided with of sticky object; Before the steps A 4, also carry out following steps: in the hypobaric that is not more than 20,000 handkerchiefs, described piezo-electricity composite material is carried out degassing processing.
Described preparation method, wherein, steps A 3 specifically may further comprise the steps: described piezo-electricity composite material is placed on builds in the mould, pour described filler into the described mould of building, until being full of each filling slot.
Adopt such scheme, the present invention proposes a kind of multilayer 3-1 type piezo-electricity composite material that is easy to process of new structure, replace 1-3 type piezo-electricity composite material, can be used for making multilayer ultrasonic transducer or transducer etc., avoid and solved the inaccurate problem of the mutual contraposition of adjacent layer.The processing technology of product of the present invention is simple, and the direction of piezoelectric monocrystal cutting is had only both direction, has saved process time and cost.
Description of drawings
Fig. 1 to Fig. 9 is respectively the schematic cross-section of the piezo-electricity composite material working face of the various execution modes of the present invention;
Figure 10 is the two layers of piezoelectric material schematic diagram of one embodiment of the present invention;
Figure 11 is the adjacent surface electrode and the side electrode schematic diagram of execution mode shown in Figure 10;
Figure 12 is provided with schematic diagram for the adjacent layer piezoelectric connection of execution mode shown in Figure 10;
Figure 13 is an execution mode cutting effect schematic diagram shown in Figure 10;
Figure 14 builds mould for execution mode shown in Figure 13 adopts and pours filler effect schematic diagram into;
The moulding material schematic diagram that Figure 15 obtains for execution mode shown in Figure 14;
The piezo-electricity composite material schematic diagram that Figure 16 obtains for execution mode shown in Figure 15.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present invention is directed to adopt 1-3 type piezo-electricity composite material multilayer ultrasonic transducer in manufacture process, the problem of the mutual contraposition of adjacent layer, what propose a kind of new structure is easy to the multilayer 3-1 type piezo-electricity composite material processed more; Adopt this piezo-electricity composite material, can replace 1-3 type piezo-electricity composite material, make multilayer ultrasonic transducer, avoided and solved the problem of the mutual contraposition of adjacent layer.
The invention provides a kind of 3-1 type multi-layer piezoelectric composite material, comprise: multilayer is by the piezoelectric crystal material of the three-dimensional communication mode relative according to adjacent layer polarity, the piezo-electricity composite material of the epoxy resin adhesive combination of the low-viscosity that framework that the cutting back forms and viscosity are not more than 80Pas (8000centipoise, i.e. 8000 centipoises).In the multi-layer piezoelectric composite material of the present invention, each layer thickness can be identical also can be inequality; And each lamination electric crystal material can be identical, also can be different, as long as adjacent layer piezoelectric crystal material polarised direction is on the contrary.
Piezoelectric crystal material framework wall thickness after the cutting should be not more than 1/3rd of whole 3-1 type piezo-electricity composite material thickness.Piezoelectric can comprise piezoelectric monocrystal, i.e. piezoelectric quartz crystal and other piezoelectric monocrystals; Piezoelectric ceramic; Piezoelectric semiconductor and organic polymer piezoelectric or the like.
As shown in figure 10, the invention provides a kind of piezo-electricity composite material, it comprises two layers of piezoelectric material at least; In the embodiment shown in fig. 10, this piezo-electricity composite material only comprises two layers of piezoelectric material: ground floor piezoelectric 101 and second layer piezoelectric 102.
According to the polarity of each layer of piezo-electric material, promptly according to the polarised direction of each layer of piezo-electric material, the adjacent layer piezoelectric oppositely is provided with; As shown in figure 16, the polarised direction 201 of ground floor piezoelectric 101 is downward, and then the polarised direction 202 of second layer piezoelectric 102 upwards; And each working face at described piezo-electricity composite material is provided with working face electrode 203 respectively.
Each layer of piezo-electric material three-dimensional communication is provided with, and described filler one dimension connect is provided with; Just form the piezo-electricity composite material of a 3-1 type.In the cross section that is parallel to described piezo-electricity composite material working face, described piezoelectric is communicated with setting with the form of regular bar shaped combination, and described filler is isolated setting.
For example, in the described regular bar shaped combination, described regular bar shaped comprise at least following shape one of them: rectangle, ellipse, triangle, arc; It can certainly be the combination of above-mentioned figure.Described shape be should give the explanation of maximum magnitude, and for example described rectangle has comprised round rectangle, and the parallelogram that obtains by triangle combination or the like.
And for example, described combination comprise at least following shape one of them: C shape, I shape, N shape, S shape, U-shaped, V-arrangement, combination is derived from and can be obtained A shape, B shape, D shape, E shape, F shape, G shape, H shape, J-shaped, K shape, L shaped, M shape, O shape, P shape, Q shape, R shape, T shape, W shape, X-shaped, Y shape, Z-shaped thus; And A shape, B shape, C shape, D shape, E shape, F shape, G shape, H shape, I shape, J-shaped, K shape, L shaped, M shape, N shape, O shape, P shape, Q shape, R shape, S shape, T shape, U-shaped, V-arrangement, W shape, X-shaped, Y shape, Z-shaped; And A shape, B shape, C shape, D shape, E shape, F shape, G shape, H shape, I shape, J-shaped, K shape, L shaped, M shape, N shape, O shape, P shape, Q shape, R shape, S shape, T shape, U-shaped, V-arrangement, W shape, X-shaped, Y shape, Z-shaped; And seven fonts, cross, mountain font, wooden font or the like.
For example, the arbitrary cross section that is parallel to this piezo-electricity composite material working face of 9 kinds of execution modes of the present invention is respectively as Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, shown in Figure 9, it is respectively the arbitrary schematic cross-section that is parallel to this piezo-electricity composite material working face of 9 kinds of execution modes, like this, for the arbitrary cross section that is parallel to this piezo-electricity composite material working face, described piezo-electricity composite material all is communicated with.Need to prove that Fig. 1 extremely execution mode shown in Figure 9 only is a part execution mode of the present invention, when specifically implementing, can be improved or conversion according to Fig. 1 to Fig. 9 meeting on the basis of described piezoelectric with the form connection setting of regular bar shaped combination.
In the described piezo-electricity composite material, described working face comprise at least following shape one of them: circle, ellipse, triangle, parallelogram; Can certainly be the combination of above-mentioned figure, for example trapezoidal, pentagon, hexagon, positive heptagon or the like, parallelogram has comprised rhombus, rectangle and square.
As shown in figure 11, in the described piezo-electricity composite material, the adjacent surface of each layer of piezo-electric material is provided with adjacent surface electrode 104 respectively.Afterwards, can also be respectively in the side of the described adjacent surface of each layer of piezo-electric material, the side electrode 105 that is connected with the adjacent surface electrode of this layer of piezo-electric material is set, and the side electrode 106 that is connected at the adjacent surface electrode of its adjacent layer piezoelectric.Need to prove that side electrode 105 and side electrode 106 are changeable, the position is not limit, and only needs to realize drawing from the side the adjacent surface electrode and gets final product.
In the described piezo-electricity composite material, each layer of piezo-electric material shape is identical, bonding setting, and all the piezoelectric total accounts for 15% to 85% of cumulative volume.
And the present invention also provides a kind of preparation method of piezo-electricity composite material, and it may further comprise the steps.
A1, for two layers of piezoelectric material at least, according to the polarity of each layer of piezo-electric material, oppositely be communicated with the adjacent layer piezoelectric be set.
For example, in steps A 1, by the adjacent surface in each layer of piezo-electric material the adjacent surface electrode is set respectively, oppositely connection is provided with the adjacent layer piezoelectric; And steps A 1 is further comprising the steps of: respectively in the side of the described adjacent surface of each layer of piezo-electric material, the side electrode that is connected with the adjacent surface electrode of this layer of piezo-electric material is set.
A2, in the polarised direction of piezoelectric, cutting connects at least two filling slots of each layer of piezo-electric material, to form the piezoelectric that adopts regular bar shaped combining form to be communicated with.
Wherein, in the described regular bar shaped combination, described regular bar shaped comprise at least following shape one of them: rectangle, ellipse, triangle, arc; It can certainly be the combination of above-mentioned figure.
And for example, described combination comprise at least following shape one of them: C shape, I shape, N shape, S shape, U-shaped, V-arrangement, combination is derived from and can be obtained different shape thus.
Described working face comprise at least following shape one of them: circle, ellipse, triangle, parallelogram; It can certainly be the combination of above-mentioned figure.
Described regular bar shaped, described combination, described working face are specifically same as above.
A3, in each filling slot, filler is set.The present invention does not limit concrete filler and fill method, and the filler and the fill method that only need to be applied in this area get final product.
For example, steps A 3 specifically may further comprise the steps: described piezo-electricity composite material is placed on builds in the mould, pour described filler into the described mould of building, until being full of each filling slot.
A4, at each working face of described piezo-electricity composite material, the working face electrode is set respectively.
In steps A 1, can adopt the bonding adjacent layer piezoelectric that is provided with of sticky object; Being about to adjacent two layers of piezoelectric material glues with sticky object; And, before steps A 4, also need carry out following steps: in the hypobaric that is not more than 20,000 handkerchiefs, described piezo-electricity composite material is carried out degassing processing.
Need to prove that bonding agent can be identical with above-mentioned filler, also can be inequality, for example, can adopt filler with viscosity; Then in steps A 1, adopt the bonding adjacent layer piezoelectric that is provided with of described filler; And, before steps A 4, also carry out following steps: in the hypobaric that is not more than 20,000 handkerchiefs, described piezo-electricity composite material is carried out degassing processing.
For example, the vacuum of the epoxy resin adhesive of low-viscosity or low pressure degasification can be carried out before building mould pouring into, also can carry out after building mould pouring into.
Provide a concrete example below again, the step that adopts cutting-completion method to prepare the two-layer piezo-electricity composite material of 3-1 type of the present invention is described.
1) two blocks of piezoelectric crystals of preparing processing, as shown in figure 10, i.e. ground floor piezoelectric 101 and second layer piezoelectric 102.As shown in figure 11, on the bonding plane of the piezoelectric crystal that two preparations are processed, the preparation conductive electrode, it is adjacent surface electrode 104, and adjacent surface electrode 104 is extended to the side of piezoelectric crystal, as shown in figure 11, also can be that the side electrode 105 that ground floor piezoelectric 101 is connected is set respectively, and the side electrode 106 that is connected at the adjacent surface electrode of its adjacent layer piezoelectric.
This step, be on the bonding plane of the piezoelectric crystal that two preparations are processed, to prepare conductive electrode, and electrode is extended to the side of piezoelectric crystal, an interface that is used to connect electricity promptly is set in the side, more particularly, be the conductive region that is used for external wire, thereby introduce the excitation signal of telecommunication or draw the response signal of telecommunication; Adjacent surface electrode and side electrode can pass through on two surfaces up and down of piezo-electricity composite material, brushing conducting metal paste materials, and perhaps bonding conductive solids metal level perhaps adopts the method formation conductive film or the thick film of physics or chemistry to prepare.
2) as shown in figure 12, adopt the epoxy resin adhesive of low-viscosity, two blocks of piezoelectric crystals of preparing processing are bonded together by opposite polarised direction; And thin as far as possible by the epoxy resin adhesive assurance thickness of adhibited layer of low-viscosity, generally be lower than 100 microns, be more preferably, be lower than 10 microns.This example adopts epoxy resin as filler, and the present invention does not limit the use of filler.
3), cut out as shown in figure 13, for building several trough epoxy resin, that connect along the cutting of piezoelectric crystal material polarised direction along direction perpendicular to piezoelectric crystal polarization; Can cut sidewards, can endwaysly cut yet, the present invention does not do outer restriction to this; Obtain the piezoelectric crystal 100 of well cutting at last.
This step, use cutting tool, to choose perpendicular to a direction of piezoelectric crystal polarization piezoelectric crystal is cut, cutting not exclusively connects piezoelectric crystal in this direction, and cutting runs through fully in the direction along the piezoelectric crystal polarization.Like this, just can obtain the piezoelectric crystal 100 of three-dimensional communication.
4) as shown in figure 14, the piezoelectric crystal of well cutting is placed build mould 200; The general selection by with behind the employed epoxy resin cure mould of building that strong sticking glutinous material makes not taking place, these materials can be polytetrafluoroethylene etc.
Like this, this build epoxy resin after mould and the employed curing do not take place strong sticking glutinous, thereby make its piezo-electricity composite material that breakage can not take place with moulding, separation smoothly.
5) configure the epoxy resin adhesive 210 of low-viscosity.For example, the epoxy resin adhesive each several part of the low-viscosity proportioning according to operation instruction is configured, and evenly stirs.
6) as shown in figure 14, the epoxy resin adhesive 210 of the low-viscosity that configures poured into build in the mould, and epoxy resin adhesive is carried out degassing processing in being not more than the hypobaric of 20kPa; Preferably carry out degassing processing in a vacuum; Degassing processing is not till having bubble to overflow.As shown in figure 15, obtain the material 110 of moulding.
3-1 piezo-electricity composite material blank after the moulding with build mould separating after, can cut further, polish, process and other processing.
7) as shown in figure 16, treat that epoxy resin adhesive solidifies after, prepare conductive electrode on the two layers of surface up and down at composite material, promptly the working face electrode 203.Working face electrode 203 can pass through on two surfaces up and down of piezo-electricity composite material, and the method for brushing conducting metal paste materials or bonding conductive solids metal level or employing physics or chemistry forms conductive film or thick film and prepares.
The epoxy resin adhesive of low-viscosity is taked the indication of operation instruction curing time at normal temperatures, and the present invention does not limit this.
In sum, the present invention proposes a kind of novel 3-1 type multi-layer piezoelectric composite structure mode, replace 1-3 type piezo-electricity composite material, can be used for making multilayer ultrasonic transducer, also can be used for making miscellaneous equipment, for example transducer etc.The working face (side) that is applied to the 3-1 type piezo-electricity composite material of multilayer ultrasonic transducer can be circular, oval, also can be square, rectangle, parallelogram, can be applied to the monomer ultrasonic transducer, also can be applicable to ultrasound transducer array.Adopt said structure, 3-1 type piezoceramic multilayer piezo-electricity composite material of the present invention to have higher energy converting between mechanical efficient, lower density and acoustic impedance.Be easy to processing simultaneously, only need carry out the cutting of both direction piezoelectric crystal material.And can guarantee the piezoelectric crystal unit of each layer of multi-layer piezoelectric composite material centre and the accurate contraposition of piezoelectric crystal unit in the middle of the adjacent layer, avoided because the mutual contraposition of adjacent layer is inaccurate, the output signal of the ultrasonic transducer that is caused descends, and the problem of introducing other unwanted vibration mode.
The applied field of the present invention is an industrial nondestructive testing, biomedical imaging, diagnosis and treatment, and sonar technology etc. under water; In particular, the present invention can be applied to the linearity and the nonlinear change sign of defect detection, physical dimension measurement and the material mechanical characteristic of metal or nonmetallic materials and test specimen; The ultrasonic transducer of manufacturing of the present invention can be applied to the linearity or the nonlinear acoustics characteristic present of biological tissue or organ.
The present invention is adding on the technology simply, has avoided and solved the problem of the mutual contraposition of adjacent layer; Direction to the piezoelectric monocrystal cutting has only both direction, has saved process time and cost; And for the structure of new 3-1 type piezo-electricity composite material provides new thinking.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (10)
1, a kind of piezo-electricity composite material, it comprises piezoelectric and filler; It is characterized in that it comprises two layers of piezoelectric material at least, wherein,
According to the polarity of each layer of piezo-electric material, the adjacent layer piezoelectric oppositely is provided with;
Each layer of piezo-electric material three-dimensional communication is provided with, and described filler one dimension connect is provided with;
Each working face at described piezo-electricity composite material is provided with the working face electrode respectively;
In the cross section that is parallel to described piezo-electricity composite material working face, described piezoelectric is communicated with setting with the form of regular bar shaped combination, and described filler is isolated setting.
2, piezo-electricity composite material according to claim 1 is characterized in that, the adjacent surface of each layer of piezo-electric material is provided with the adjacent surface electrode respectively.
3, piezo-electricity composite material according to claim 2 is characterized in that, respectively in the side of the described adjacent surface of each layer of piezo-electric material, the side electrode that is connected with the adjacent surface electrode of this layer of piezo-electric material is set.
4, piezo-electricity composite material according to claim 1 is characterized in that, in the described regular bar shaped combination, described regular bar shaped comprise at least following shape one of them: rectangle, ellipse, triangle, arc; Described combination comprise at least following shape one of them: C shape, I shape, N shape, S shape, U-shaped, V-arrangement.
5, piezo-electricity composite material according to claim 1 is characterized in that, described working face comprise at least following shape one of them: circle, ellipse, triangle, parallelogram.
6, piezo-electricity composite material according to claim 1 is characterized in that, each layer of piezo-electric material shape is identical, and bonding setting adds up to account for 15% to 85% of cumulative volume.
7, a kind of preparation method of piezo-electricity composite material, it may further comprise the steps:
A1, for two layers of piezoelectric material at least, according to the polarity of each layer of piezo-electric material, oppositely be communicated with the adjacent layer piezoelectric be set;
A2, in the polarised direction of piezoelectric, cutting connects at least two filling slots of each layer of piezo-electric material, to form the piezoelectric that adopts regular bar shaped combining form to be communicated with;
A3, in each filling slot, filler is set;
A4, at each working face of described piezo-electricity composite material, the working face electrode is set respectively.
8, preparation method according to claim 7 is characterized in that, in the steps A 1, by the adjacent surface in each layer of piezo-electric material the adjacent surface electrode is set respectively, oppositely is communicated with the adjacent layer piezoelectric is set; And steps A 1 is further comprising the steps of: respectively in the side of the described adjacent surface of each layer of piezo-electric material, the side electrode that is connected with the adjacent surface electrode of this layer of piezo-electric material is set.
9, preparation method according to claim 7 is characterized in that, described filler has viscosity;
And, in the steps A 1, adopt the bonding adjacent layer piezoelectric that is provided with of sticky object;
Before the steps A 4, also carry out following steps: in the hypobaric that is not more than 20,000 handkerchiefs, described piezo-electricity composite material is carried out degassing processing.
10, preparation method according to claim 7 is characterized in that, steps A 3 specifically may further comprise the steps: described piezo-electricity composite material is placed on builds in the mould, pour described filler into the described mould of building, until being full of each filling slot.
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| CN115643783A (en) * | 2022-11-07 | 2023-01-24 | 中南大学 | Multilayer oriented porous piezoelectric composite material, preparation method thereof and piezoelectric energy collector |
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