CN204596845U - A kind of shearing-type Piezoelectric anisotropy structure - Google Patents
A kind of shearing-type Piezoelectric anisotropy structure Download PDFInfo
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Abstract
A kind of shearing-type Piezoelectric anisotropy structure, the outermost of composite construction is two-layer is flexible dielectric films, and intermediate layer is piezoelectric phase/epoxy resin composite bed, is interdigited electrode between intermediate layer and flexible dielectric films; Positive pole finger and the negative pole finger of described interdigited electrode replace equidistant arrangement, and upper and lower two interdigited electrodes are Mirror Symmetry, and align; The finger of described interdigited electrode is parallel with the piezoelectric phase of piezoelectric phase/epoxy resin composite bed, and electrode finger is positioned at the upper and lower surface at piezoelectric phase and epoxy resin faying face edge; Piezoelectric phase polarised direction is the direction perpendicular to composite bed plane.The utility model provides that a kind of thickness is thin, compact conformation, the curved-surface structure realize the chip type piezoelectric composite construction of to a certain degree plastic deformation of can fitting, and is applicable to making driver, sensor.
Description
Technical field
The utility model relates to a kind of shearing-type Piezoelectric anisotropy structure.
Background technology
In more than ten years in the past, the various adaptive structure with the function such as structural health self diagnosis, environment self-adaption, certainly monitoring becomes study hotspot, and this class set main structure, transducer and driver are widely used in the fields such as structure detection, collection of energy and vibration control in the composite construction of one.And piezoelectric ceramic, the features such as, electomechanical response high by means of its energy density is changed soon, actuating force is large become the actuator material that in adaptive structure, range of application is the widest.
Piezoelectric ceramic produces distortion under DC Electric Field, is a kind of functional material that can realize electric energy and changes mechanical energy.The deformation direction of piezoelectric ceramic has close relationship with the direction of extra electric field: when extra electric field direction is parallel with its polarised direction, then piezoelectric ceramic can produce along polarised direction (d
33piezoelectric effect) and perpendicular to polarised direction (d
31piezoelectric effect) distortion, this is the axial piezoelectric effect that make use of piezoelectric ceramic; When extra electric field direction is vertical with its polarised direction, then piezoelectric ceramic can produce a pure shear (d
15piezoelectric effect) distortion, this is the shearing piezoelectric effect that make use of piezoelectric ceramic.
Now widely used piezoelectric device is the d based on piezoelectric ceramic mostly
33piezoelectric effect and d
31piezoelectric effect design.In vibration suppression or adaptive control field, usually this kind of piezoelectric device is directly pasted on agent structure surface, by the stretcher strain of piezoelectric ceramic, main structure is controlled.The type of drive of this surface mount makes piezoelectric device be easy to when being subject to the percussion of external load fracture occurs and peels off.And, when larger flexural deformation occurs structure, the stress born due to body structure surface is maximum, and the piezoelectric device being therefore pasted onto body structure surface also will bear higher bending stress, very easily cause piezoelectric ceramic to rupture, piezoelectric device was lost efficacy when structure generation large deformation.The operational environment being in stress state for a long time also can cause piezoelectric ceramic stress tired and lose efficacy, thus reduces the life-span of piezoelectric device.
For above situation, Sun and Zhang of Aero-Space institute of Purdue Univ-West Lafayette USA proposes a kind of self-adapting intelligent structure utilizing piezoelectric ceramic shearing effect to realize.Piezoelectric ceramic thin sheet is placed in the centre of two pieces of agent structure panels by this structure, and the driving direction of an electric field putting on piezoelectric ceramic is vertical with its polarised direction, pure shear distortion occurs thus the distortion of control subject structure at electric field action lower piezoelectric pottery.Under shearing work pattern, on the one hand, piezoelectric device is in structure neutral line position, even if larger distortion occurs agent structure, the stress level that piezoelectric device bears is still very low, and therefore the piezoelectric device of this shear mode has long service life, the advantage such as incrust.On the other hand, the shearing piezoelectric constant d of general piezoelectric ceramic
15numerically than d
31and d
33all much bigger, under identical driving current field condition, the ess-strain that shearing-type piezoelectric device produces is larger.The follow-up study of the people such as Sun and Benjeddou shows, compared to the device utilizing axial piezoelectric effect, utilize the agent structure vibration suppression ability of shearing-type piezoelectric device better, its integrated machine electric coupling coefficient be the former more than 3 times, additional damping be the former more than 12 times, amount of decrease degree be the former more than 2 times.Therefore, the application prospect of shearing-type piezoelectric device in the field such as vibration control, collection of energy more and more causes the extensive concern of researcher.
Although shearing-type piezoelectric device shows application prospect in adaptive structure, the fragility of piezoceramic material still limits its range of application, particularly at curved surface and membrane structure control field.In order to address this problem, Kranz has relied on German Smart Material Inc. for a kind of shearing-type Piezoelectric anisotropy structure, is composited, as shown in Figure 1 by piezoelectric ceramic fibers, resin, copper electrode and upper and lower surface flexible insulation polyimide film.In this composite construction, the polarised direction of piezoelectric fabric is length direction, is applied the operating voltage of through-thickness, make use of the shearing piezoelectric effect of piezoelectric by copper electrode.And the polymeric matrix of coated piezoelectric fabric can be compound and provides structural integrity, the antibody Monoclonal ability of piezoelectric fabric can be increased substantially by stress transfer mechanism, overcome the brittleness problems of piezoelectric ceramic well.So this material to be a kind of thickness thin, lightweight, the shearing-type Piezoelectric anisotropy structure of significantly bending and torsion can be carried out.But structure needs to apply higher polarizing voltage; Use higher polarizing voltage to have higher requirement to polarizer apparatus on the one hand, also can bring certain hidden danger on the other hand, harm personal security.
Utility model content
The purpose of this utility model is for the existing structure of shearing-type piezoelectric and the advantage of aspect of performance and deficiency, propose a kind of new compact conformation, what polarizing voltage was low can fit curved-surface structure also realizes the shearing-type Piezoelectric anisotropy structure of to a certain degree plastic deformation.
The technical solution of the utility model is:
The structure of shearing-type piezoelectric of the present utility model be outermost two-layer be flexible dielectric films, intermediate layer is piezoelectric phase/epoxy resin composite bed, is interdigited electrode between intermediate layer and flexible dielectric films; Positive pole finger and the negative pole finger of described interdigited electrode replace equidistant arrangement, and upper and lower two interdigited electrodes are Mirror Symmetry, and align; The finger of described interdigited electrode is parallel with the piezoelectric phase of piezoelectric phase/epoxy resin composite bed, and electrode finger is positioned at the upper and lower surface at piezoelectric phase and epoxy resin faying face edge; Piezoelectric phase polarised direction is the direction perpendicular to composite bed plane.
The Piezoelectric anisotropy structure that the utility model proposes is respectively polyimide film, interdigited electrode from top to bottom, piezoelectric phase/epoxy resin composite bed, interdigited electrode, polyimide film.Preferably, piezoelectric phase is lead titanate piezoelectric ceramics (PZT), and piezoelectric phase/epoxy resin composite bed is the overall structure of a chip.
Piezoelectric phase of the present utility model/epoxy resin composite bed forms by the epoxy resin between fibrous piezoelectric phase planar arranged in parallel and adjacent fiber is alternate.The piezoelectric phase cross section of described composite bed is rectangle.The width of the piezoelectric phase of described composite bed is equal with the spacing of two piezoelectric phases.
The utility model is preferred, and electrode material is copper.
In the utility model preferred piezoelectric phase/epoxy resin composite bed, the width of piezoelectric fabric is all equal with the finger spacing of interdigited electrode with fiber spacing, and all electrode fingers are positioned at the upper and lower surface at piezoelectric phase and epoxy resin faying face edge, as shown in Figure 2.Compound perpendicular to machine direction sectional view as shown in Figure 3.
As further improvement of the utility model, each piezoelectric phase width is greater than the spacing of two piezoelectric phases, thus improves the volume fraction of piezoelectric phase in composite construction, enhances the piezoelectric property of composite construction.Interdigited electrode positive pole finger and negative pole finger replace Unequal distance arrangement, but all electrode fingers are still positioned at the upper and lower surface at piezoelectric phase and epoxy resin faying face edge.
As further improvement of the utility model, piezoelectric phase width is less than the spacing of two piezoelectric phases, thus improves the volume fraction of composite structure epoxy resin, enhances the flexibility of composite structure.Corresponding interdigited electrode positive pole finger and negative pole finger replace Unequal distance arrangement, but all electrode fingers are still positioned at the upper and lower surface at piezoelectric phase and epoxy resin faying face edge.
As further improvement of the utility model, piezoelectric phase can be lead magnesio-niobate lead titanates (PMN-PT), Kynoar (PVDF), potassium-sodium niobate (KNN) or other piezoelectrics, then final obtained structures of piezoelectric composite has better piezoelectricity, or better flexible, or better environment friendly.
As further improvement of the utility model, the epoxy resin in piezoelectric phase/epoxy resin composite bed can be substituted by other flexible insulating materials such as silica gel, rubber.
As further improvement of the utility model, electrode material can be other conductive materials such as silver-colored, golden.
Binding agent as the utility model bonding polyimide film, electrode and piezoelectric phase/epoxy resin composite bed can be epoxy resin, AB glue or other seccotines.
Interdigited electrode is printed onto on polyimide film by the preparation method of above-mentioned flexible piezoelectric composite construction, is printed onto on polyimide film by interdigited electrode, then bonds with piezoelectric phase/epoxy resin composite bed.
The preparation method of another kind of flexible piezoelectric composite construction is upper and lower surface interdigited electrode and interdigited electrode being printed onto piezoelectric phase/epoxy resin composite bed, then bonds with polyimide film and polyimide film.
In all above-mentioned preparation methods, described electrode is compounded in the upper and lower surface of piezoelectric phase/epoxy resin composite bed or polyimide film by methods such as silk screen printing, plating, magnetron sputtering or chemical depositions.
In all above-mentioned preparation methods, piezoelectric phase/epoxy resin composite bed is by method preparations such as cutting-completion method, the tape casting or extrusion moldings.
The beneficial effects of the utility model are:
Adopt structure of the present utility model not only to have less operating voltage equally, its polarizing voltage also significantly reduces.The piezoelectric ceramic piece of required polarization can be prepared easily by conventional cutting-completion method.The utility model by piezoelectric fabric, resin, electrode by Film laminated together, makes composite construction have higher integration, easy to use.The utility model effectively can also regulate the operating voltage range of final material, thus adapts to different operational environments, and the utility model has the adjustable range of more wide in range operating voltage relative to the composite construction of prior art.
Accompanying drawing explanation
Fig. 1 is a kind of shearing-type structures of piezoelectric composite schematic diagram prepared by prior art;
Fig. 2 is shearing-type structures of piezoelectric composite schematic diagram described in the utility model;
Fig. 3 is the interface schematic diagram of single fiber in the piezoelectric phase/epoxy resin composite bed of shearing-type structures of piezoelectric composite described in the utility model;
Number in the figure letter P represents the polarised direction of piezoelectric fabric.
Number in the figure 1 is polyimide film, and 2 is interdigited electrode, and 3 is piezoelectric phase/epoxy resin composite bed, and 4 is piezoelectric fabric, and 5 is epoxy resin, and 6 is interdigited electrode finger.
Embodiment
In order to deepen understanding of the present utility model, below in conjunction with embodiment, the utility model is described in further detail, and this embodiment, only for explaining the utility model, does not form the restriction to the utility model protection range.
Embodiment 1
Lead titanate piezoelectric ceramics is processed into the thin slice of 30mm × 10mm × 0.5mm, electrode is made at upper and lower surface coating silver slurry after cleaning-drying, apply the polarizing voltage of 1.5kV, thus make it polarize along thickness direction at the polarized electric field of thickness direction acquisition 3kV/mm.Utilize cutting machine to cut it, obtain by selecting the blade of suitable thickness and arranging cutting spacing the piezoelectric ceramic fibers array that a fiber width and fiber spacing are equal to 0.5mm.In array, fill E-51 epoxy resin, obtain the lead zirconate titanate/E-51 epoxy resin composite bed 3 of 30mm × 10mm × 0.18mm after solidification through reduction processing, the ag paste electrode of original piezoelectric ceramic upper and lower surface coating is in the process worn away.Utilize silk screen print method to be printed onto on polyimide film by interdigited electrode, positive pole finger and the negative pole finger spacing of interdigited electrode are 0.5mm, and interdigited electrode is Mirror Symmetry up and down.This perfecting is brushed with the polyimide film of interdigited electrode with E-51 epoxy resin again and lead zirconate titanate/E-51 epoxy resin composite bed bonds, upper and lower interdigited electrode is kept to align, lead zirconate titanate piezoelectric fibers parallel in finger and lead zirconate titanate/E-51 epoxy resin composite bed, and all electrode fingers are positioned at the upper and lower surface at lead zirconate titanate and E-51 epoxy resin faying face edge.Operating voltage is 0 to 220V.
Embodiment 2
By lead zirconate titanate pre-burning powder and hydrocarbon black powder respectively with binding agent, plasticiser, dispersant and solvent, make sheet green compact respectively by the tape casting, through compacting, carbonization treatment make lead zirconate titanate slice matrix after sintering after alternately stacking.Fill 711 epoxy resin in a matrix, after solidification, obtain lead zirconate titanate/E-51 epoxy resin composite bed through cutting.In above process, by controlling the parameter such as green compact thickness, cutting distance, the final lead zirconate titanate/E-51 epoxy resin composite bed obtained is of a size of 10mm × 5mm × 0.2mm, and fiber width wherein and fiber spacing are 0.4mm.Silk screen print method is utilized interdigited electrode to be printed onto the upper and lower surface of lead zirconate titanate/711 epoxy resin composite bed, positive pole finger and the negative pole finger spacing of interdigited electrode are 0.4mm, and interdigited electrode is Mirror Symmetry up and down, lead zirconate titanate fibers parallel in finger and lead zirconate titanate/711 epoxy resin composite bed, all electrode fingers are positioned at the upper and lower surface at lead zirconate titanate and 711 epoxy resin faying face edges.Bond being printed with the lead zirconate titanate/711 epoxy resin composite bed of interdigited electrode and polyimide film and polyimide film with 711 epoxy resin again.Operating voltage is 0 to 160V.
Comparative example 1
Preparation composite structure as is shown in fig. 1, lead titanate piezoelectric ceramics is processed into the thin slice of 30mm × 10mm × 0.5mm, electrode is made at two of length direction end face coating silver slurries after cleaning-drying, need to apply the polarizing voltage of 90kV, the polarized electric field that could obtain 3kV/mm at length direction makes it alongst polarize.Utilize cutting machine to cut it, obtain by selecting the blade of suitable thickness and arranging cutting spacing the piezoelectric ceramic fibers array that a fiber width and fiber spacing are equal to 0.5mm.In array, fill E-51 epoxy resin, after solidification, the silver electrode of two end faces is polished off, and obtain the lead zirconate titanate/E-51 epoxy resin composite bed of 30mm × 10mm × 0.18mm through reduction processing.Copper electrode is printed onto on polyimide film, then this perfecting is brushed with the polyimide film of electrode with E-51 epoxy resin and lead zirconate titanate/E-51 epoxy resin composite bed bonds.Operating voltage is 0 to 72V.
Although comparative example 1 adopts same material when preparing shearing-type piezoelectric fibre composite material structure compared with embodiment 1, under same size, polarizing voltage is 60 times of the utility model name embodiment 1, and polarization process requires higher, forms very large danger to experimenter.
Embodiment described above is that the personnel being convenient to this technical field understand and apply this utility model, and that makes by the utility model enlightenment and to the utility model all belongs within protection range of the present utility model without the amendment creating meaning.
Claims (6)
1. a shearing-type Piezoelectric anisotropy structure, is characterized in that, the outermost of composite construction is two-layer is flexible dielectric films, and intermediate layer is piezoelectric phase/epoxy resin composite bed, is interdigited electrode between intermediate layer and flexible dielectric films; Positive pole finger and the negative pole finger of described interdigited electrode replace equidistant arrangement, and upper and lower two interdigited electrodes are Mirror Symmetry, and align; The finger of described interdigited electrode is parallel with the piezoelectric phase of piezoelectric phase/epoxy resin composite bed, and electrode finger is positioned at the upper and lower surface at piezoelectric phase and epoxy resin faying face edge; Piezoelectric phase polarised direction is the direction perpendicular to composite bed plane.
2. a kind of shearing-type Piezoelectric anisotropy structure according to claim 1, is characterized in that, described piezoelectric phase/epoxy resin composite bed forms by the epoxy resin between fibrous piezoelectric phase arranged in parallel and adjacent fiber is alternate.
3. a kind of shearing-type Piezoelectric anisotropy structure according to claim 1, it is characterized in that, the width of the piezoelectric phase of described composite bed is equal with the spacing of two piezoelectric phases.
4. a kind of shearing-type Piezoelectric anisotropy structure according to claim 1, it is characterized in that, in piezoelectric phase/epoxy resin composite bed, the width of piezoelectric phase is all equal with the finger spacing of interdigited electrode with two piezoelectric phase spacing.
5. a kind of shearing-type Piezoelectric anisotropy structure according to claim 1, it is characterized in that, each piezoelectric phase width is greater than the spacing of two piezoelectric phases, interdigited electrode positive pole finger and negative pole finger replace Unequal distance arrangement, but all electrode fingers are still positioned at the upper and lower surface at piezoelectric phase and epoxy resin faying face edge.
6. a kind of shearing-type Piezoelectric anisotropy structure according to claim 1, it is characterized in that, piezoelectric phase width is less than the spacing of two piezoelectric phases, corresponding interdigited electrode positive pole finger and negative pole finger replace Unequal distance arrangement, but all electrode fingers are still positioned at the upper and lower surface at piezoelectric phase and epoxy resin faying face edge.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107424631A (en) * | 2016-04-27 | 2017-12-01 | 马格内康普公司 | Multilayer shear mode PZT micro-actuators and its manufacture method for disk drive suspension |
| CN104821372B (en) * | 2015-05-20 | 2018-06-19 | 中南大学 | A kind of shearing-type piezo-electricity composite material |
| CN110057391B (en) * | 2019-05-20 | 2021-07-20 | 中南大学 | Device and method for testing sensing performance of shear type piezoelectric sensor |
-
2015
- 2015-05-20 CN CN201520329475.5U patent/CN204596845U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821372B (en) * | 2015-05-20 | 2018-06-19 | 中南大学 | A kind of shearing-type piezo-electricity composite material |
| CN107424631A (en) * | 2016-04-27 | 2017-12-01 | 马格内康普公司 | Multilayer shear mode PZT micro-actuators and its manufacture method for disk drive suspension |
| CN107424631B (en) * | 2016-04-27 | 2021-01-08 | 马格内康普公司 | Multi-layer shear mode PZT micro-actuator for disk drive suspension and method of manufacturing the same |
| CN110057391B (en) * | 2019-05-20 | 2021-07-20 | 中南大学 | Device and method for testing sensing performance of shear type piezoelectric sensor |
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