CN102633496A - Method for preparing high-temperature and high-power piezoelectric transformers by using BLF-PTM (bismuth lanthanum ferrite-lead manganese titanate) piezoelectric ceramics - Google Patents
Method for preparing high-temperature and high-power piezoelectric transformers by using BLF-PTM (bismuth lanthanum ferrite-lead manganese titanate) piezoelectric ceramics Download PDFInfo
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- CN102633496A CN102633496A CN2012100996028A CN201210099602A CN102633496A CN 102633496 A CN102633496 A CN 102633496A CN 2012100996028 A CN2012100996028 A CN 2012100996028A CN 201210099602 A CN201210099602 A CN 201210099602A CN 102633496 A CN102633496 A CN 102633496A
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Abstract
The invention relates to a method for designing and preparing high-temperature and high-power piezoelectric transformers, belonging to the technical field of designing and preparing inorganic non-metallic materials and electronic devices. The method disclosed by the invention is used for designing and preparing a high-power-density piezoelectric transformer which is prepared mainly by using BLF-PTM hardening piezoelectric ceramics and can be used at high temperature. The upper and lower surfaces of a wafer type piezoelectric ceramic are respectively coated with a high-temperature silver electrode, an upper electrode is made of a mask plate, the center of the upper electrode is a circle, a ring is arranged outside the circle, and a certain gap is formed between the circle and the ring. An external ring electrode is taken as an input electrode, and a central circle electrode is taken as an output electrode. A piezoelectric ceramic wafer with prepared electrodes is put into 120OC silicone oil and then polarized for 20 minutes in a 30kV/cm electric field, so that a unidirectional polarized wafer type high-temperature and high-power-density piezoelectric transformer is obtained. According to the invention, the power densities of the piezoelectric transformer at different temperatures are measured.
Description
Technical field
The present invention relates to a kind ofly prepare the method for high temperature high power density piezoelectric transformer with ferrous acid bismuth-lead titanate series piezoelectric ceramic.Belong to ceramic and electronic device design and preparing technical field.
Background technology
Piezoelectric transformer is the electron device that a kind of electricity-machine-coupling effect that utilizes piezoelectric ceramics is realized transformation.Because in the driving circuit that its efficiency of conversion is high, immunity from interference is strong, volume is little, nonflammable characteristics are applied to electronicss such as liquid-crystal display (LCD), FPD (LED), purifying air, copier widely.Using now is the Rosen type piezoelectric transformer with higher step-up ratio more widely, but its power density is generally less than 2 W/cm
3, be not suitable in high-power circuit, using.And at electronics constantly under superpowerization and integrated direction Development Trend, disk type and circular ring type piezoelectric transformer receive publicity owing to having higher power density.
People such as Berlincourt developed the disk type piezoelectric transformer with single direction of polarization first in 1973.Subsequently, the rigid PZT pottery of humans such as Laoratanakul is prepared unidirectional polarization disk type piezoelectric transformer, has successfully driven piezo-electric motor, and its power density is 3.5 W/cm
3People such as Priya in 2004 and Uchino develop three layers of power density with the individual layer piezoelectric transformer of the unidirectional polar of disk type and are respectively 25 and 40 W/cm
3, the maximum power density that on behalf of present piezoelectric transformer, the latter can reach.The key that improves the piezoelectric transformer power-performance is to develop the high-power piezoelectric with superior piezoelectric property and mechanical property.
Summary of the invention
The objective of the invention is to prepare a kind of piezoelectric transformer that can at high temperature work, have high power density, promptly utilize the rigid piezoelectric ceramics of BLF-PTM (ferrite bismuth lanthanum-manganese lead titanate) to prepare high temperature, superpower piezoelectric transformer.
A kind ofly prepare the method for superpower piezoelectric transformer, it is characterized in that having following process with ferrous acid bismuth-lead titanate series piezoelectric ceramic:
The preparation of a.BLF-PTM piezoelectric ceramic piece prepares by existing known technology method: (1). according to 0.6 (Bi
0.9La
0.1) FeO
3-0.4Pb (Ti
0.99Mn
0.01) O
3Stoichiometric ratio, be raw material promptly with five water Bismuth trinitrates, nine water iron nitrates, lanthanum nitrate hexahydrate, the positive four fourth fat of titanium, plumbic acetate and manganese acetate, be stirring solvent 10 hours configuration colloidal sol with terepthaloyl moietie; Then the colloidal sol that makes 70
oDry, pulverize under the C, and 600
oC high temperature was calcined 2 hours down, obtained the BLF-PTM nano powder; (2). the nano powder granulation, and depress to disk at 120 MPa pressure; Utilize two-step approach to carry out sintering at last; Be warmed up to 1070 earlier
oC cools to 800 then
oC insulation 2 hours drops to room temperature with stove subsequently, makes the BLF-PTM pottery; (3). with the slice lapping of BLF-PTM piezoelectric ceramics, polishing, obtaining thickness is that 0.55mm, diameter are the ceramic disks of 10 mm;
B. cover ag paste electrode: the upper and lower surfaces in ceramic disks is coated with high temperature silver slurry as electrode, and lower surface is coated with full electrode, and upper surface adopts mask plate to obtain a circular electrode and a ring electrode, has certain clearance between circle and the annulus;
C. heat treated: the ceramic disks that will coat electrode is put retort furnace into, 500
oC insulation 15 minutes is warmed up to 800 then
o C insulation 10 minutes is reduced to room temperature with stove at last;
D. electric field polarization down: be placed on 120 to the ceramic plate for preparing electrode
oC silicone oil the inside, along thickness direction, polarization 30 min under the electric field of 30 kV/cm; Ceramic disks after the polarization is exactly a unidirectional polar disk type piezoelectric transformer; The very input electrode that powers on of annular, circular upper electrode is an output electrode.
Advantage of the present invention and characteristics:
(1). the present invention utilizes Mn, the design of La doped bismuth ferrite-lead titanate (BLF-PTM) piezoelectric ceramics and a kind of piezoelectric transformer with high power density that can at high temperature use of preparation, it is characterized in that:
(2). the present invention utilizes the get everything ready unidirectional polarization disk type piezoelectric transformer of high power density of a kind of new rigid piezoelectric material of BLF-PTM.
(3). the superpower piezoelectric transformer among the present invention has single direction of polarization, and the electrode of the input and output side on lower conducting dome and the opposing face thereof is as high temperature resistant electrode.
(4). the Athens X-former among the present invention can be worked under higher temperature, and in room temperature to 300
oDuring the work of C temperature range, has bigger power density.
Description of drawings
The piezoelectric transformer plat among Fig. 1 the present invention and the shape and size of top electrode.
The sectional view of the piezoelectric transformer among Fig. 2 the present invention and direction of polarization.
Piezoelectric transformer input and output circuit synoptic diagram among Fig. 3 the present invention.
The Performance Test System synoptic diagram of the piezoelectric transformer among Fig. 4 the present invention.
Power density and the intensification under different input voltages during matched load at room temperature of piezoelectric transformer among Fig. 5 the present invention.
Piezoelectric transformer among Fig. 6 the present invention is the power density under the different input voltages when the differing temps matched load.
Embodiment
After specific embodiment of the present invention being described at present.
Embodiment
To prepare the step of superpower piezoelectric transformer following for the BLF-PTM piezoelectric ceramics in the present embodiment:
1. being raw material with five water Bismuth trinitrates, nine water iron nitrates, lanthanum nitrate hexahydrate, the positive four fourth fat of titanium, plumbic acetate and manganese acetate, is solvent with terepthaloyl moietie, according to 0.6 (Bi
0.9La
0.1) FeO
3-0.4Pb (Ti
0.99Mn
0.01) O
3The component of stoichiometric ratio is dissolved in raw material in the terepthaloyl moietie and stirred 10 hours; Then the colloidal sol that makes 70
oC is oven dry down.Colloidal sol after the oven dry is pulverized and 600
oC calcined 2 hours down, obtained the BLF-PTM nano powder.
2. nano powder granulation, and depress to the disk that diameter is 120mm at 120 MPa pressure; Utilize two-step approach to carry out sintering at last, be warmed up to 1070 earlier
oC cools to 800 then
oC degree insulation 2 hours, temperature drops to room temperature preparation with stove and goes out the BLF-PTM pottery subsequently.
3. with the slice lapping of BLF-PTM piezoelectric ceramics, polishing, obtaining thickness is 0.55 mm, and diameter is the ceramic disks of 10 mm.
4. the upper and lower surfaces in ceramic disks is coated with high temperature silver slurry as electrode; Lower surface is coated with full electrode; Upper surface adopts mask plate to obtain a circular electrode and a ring electrode, has certain clearance between circle and the annulus, and concrete shape and size are as shown in Figure 1; Wherein 1 is the circular electrode part, and 2 is the ring electrode part.Put the ceramic disks that coats electrode into retort furnace, 500
oC insulation 15 minutes is warmed up to 800 then
o C insulation 10 minutes is reduced to room temperature with stove at last.
5. be placed on 120 to the ceramic garden sheet for preparing electrode
oC silicone oil the inside, along thickness direction, polarization 30 min under the electric field of 30 kV/cm, direction of polarization is as shown in Figure 2.Ceramic disks after the polarization is exactly a unidirectional polar disk type piezoelectric transformer.
6. the plat of piezoelectric transformer of the present invention and sectional view thereof are as depicted in figs. 1 and 2.The input and the output circuit of the piezoelectric transformer among the present invention are as shown in Figure 3, and the top electrode 2 of annular is an input electrode, and circular upper electrode 1 is an output electrode.
Performance test
The performance test of gained high temperature high power piezoelectric transformer among the present invention
Fig. 4 is the performance test synoptic diagram of piezoelectric transformer among the present invention.The AC signal that signal generator produces amplifies the back is applied to X-former as input signal input terminus through power amplifier; AC signal by the output of piezoelectric transformer output terminal affacts on the pull-up resistor, adopts oscilloscope to survey the waveform and the size of input and output signal.Surface temperature when the piezoelectric transformer among the present invention is worked is measured by contactless infrared temperature sounder.During the high-temperature behavior of measuring transformer, be placed on piezoelectric transformer in the High Temperature Furnaces Heating Apparatus, the input/output terminal of X-former connects with high temperature resistant wire.
1) power-performance under the room temperature and intensification
Fig. 5 is power density and the intensification under different input voltages during matched load at room temperature of the piezoelectric transformer among the present invention.Along with the continuous increase of input voltage, the power density of piezoelectric transformer under matched load constantly increases, when power density greater than 10 W/cm
3Tangible intensification phenomenon appears.When piezoelectric transformer heats up 20
oDuring C, its power density is 30 W/cm
3Under the identical intensification situation, the maximum power density of the disk type high-power piezoelectric transformer of the high-power pottery preparation of PZT is generally 20 W/cm
3
2) power-performance under the high temperature
Fig. 6 is the power density under the different input voltages when the differing temps matched load of the piezoelectric transformer among the present invention.Under different temperature, the power density under the matched load all increases along with the increase of input voltage.200
oBelow the C, the power density of piezoelectric transformer reaches 27 W/cm
3When temperature is higher than 200
oDuring C, the maximum power density of piezoelectric transformer reduces along with the rising of temperature comparatively fast, and it is 250
oPower density during C can reach 20 W/cm
3, 300
oPower density during C is reduced to 14 W/cm
3When the working temperature of piezoelectric transformer is 350
oDuring C, the performance of piezoelectric transformer declines to a great extent, and power density is less than 5 W/cm
3Piezoelectric transformer of the present invention is 300
oAll has higher power density during work below the C.
Claims (1)
1. one kind prepares the method for superpower piezoelectric transformer with ferrous acid bismuth-lead titanate series piezoelectric ceramic, it is characterized in that having following process and step:
The preparation of a.BLF-PTM piezoelectric ceramic piece prepares by existing known technology method: (1). and with five water Bismuth trinitrates, nine water iron nitrates, lanthanum nitrate hexahydrate, the positive four fourth fat of titanium, plumbic acetate and manganese acetate is raw material, is solvent with terepthaloyl moietie, according to 0.6 (Bi
0.9La
0.1) FeO
3-0.4Pb (Ti
0.99Mn
0.01) O
3The component of stoichiometric ratio is dissolved in raw material in the terepthaloyl moietie and stirred 10 hours; Then the colloidal sol that makes 70
oC is oven dry down; Colloidal sol after the oven dry is pulverized and 600
oC calcined 2 hours down, obtained the BLF-PTM nano powder; (2). the nano powder granulation, and depress to the disk that diameter is 120mm at 120 MPa pressure; Utilize two-step approach to carry out sintering at last, be warmed up to 1070 earlier
oC cools to 800 then
oC degree insulation 2 hours, temperature drops to room temperature preparation with stove and goes out the BLF-PTM pottery subsequently; (3). with the slice lapping of BLF-PTM piezoelectric ceramics, polishing, obtaining thickness is 0.55 mm, and diameter is the ceramic disks of 10 mm;
B. cover ag paste electrode: the upper and lower surfaces in ceramic disks is coated with high temperature silver slurry as electrode, and lower surface is coated with full electrode, and upper surface adopts mask plate to obtain a circular electrode and a ring electrode, has certain clearance between circle and the annulus;
C. heat treated: the ceramic disks that will coat electrode is put retort furnace into, 500
oC insulation 15 minutes is warmed up to 800 then
oC insulation 10 minutes is reduced to room temperature with stove at last;
D. electric field polarization down: be placed on 120 to the ceramic plate for preparing electrode
oC silicone oil the inside, along thickness direction, polarization 30 min under the electric field of 30 kV/cm;
Ceramic disks after the polarization is exactly a unidirectional polar disk type piezoelectric transformer; The very input electrode that powers on of annular, circular upper electrode is an output electrode.
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|---|---|---|---|
| CN2012100996028A CN102633496A (en) | 2012-04-09 | 2012-04-09 | Method for preparing high-temperature and high-power piezoelectric transformers by using BLF-PTM (bismuth lanthanum ferrite-lead manganese titanate) piezoelectric ceramics |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915560A (en) * | 2013-01-09 | 2014-07-09 | 林淑媛 | Piezoelectric ceramic piece |
| CN104402426A (en) * | 2014-11-26 | 2015-03-11 | 上海大学 | Novel high temperature piezoelectric ceramic with ternary system of bismuth ferrite-lead titanate-lead zincate niobate (BF-PT-PZN) |
| CN107879746A (en) * | 2017-11-17 | 2018-04-06 | 苏州科茂电子材料科技有限公司 | A kind of preparation method and applications of piezoceramic material |
| CN110451958A (en) * | 2019-07-24 | 2019-11-15 | 嘉兴清锋新材料有限公司 | A kind of potassium niobate sodium-based leadless piezoelectric ceramic and its manufacture craft and application |
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| CN102157682A (en) * | 2010-11-25 | 2011-08-17 | 南京理工大学 | One-phase ferroelectric film and preparing method thereof as well as effective resistance regulation mode |
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| CN102320831A (en) * | 2011-05-27 | 2012-01-18 | 合肥工业大学 | Zinc-bismuth based perovskite-lead titanate-lead based relaxor ferroelectric ternary system piezoceramics and preparation method thereof |
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| CN103915560A (en) * | 2013-01-09 | 2014-07-09 | 林淑媛 | Piezoelectric ceramic piece |
| CN104402426A (en) * | 2014-11-26 | 2015-03-11 | 上海大学 | Novel high temperature piezoelectric ceramic with ternary system of bismuth ferrite-lead titanate-lead zincate niobate (BF-PT-PZN) |
| CN104402426B (en) * | 2014-11-26 | 2016-08-24 | 上海大学 | A kind of bismuth ferrite-lead titanates-lead zinc niobate (BF-PT-PZN) ternary system high-temperature piezoelectric pottery |
| CN107879746A (en) * | 2017-11-17 | 2018-04-06 | 苏州科茂电子材料科技有限公司 | A kind of preparation method and applications of piezoceramic material |
| CN110451958A (en) * | 2019-07-24 | 2019-11-15 | 嘉兴清锋新材料有限公司 | A kind of potassium niobate sodium-based leadless piezoelectric ceramic and its manufacture craft and application |
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Application publication date: 20120815 |