CN108395244A - High-performance bismuth-sodium titanate system no-lead electrostrictive ceramics and its preparation and application - Google Patents
High-performance bismuth-sodium titanate system no-lead electrostrictive ceramics and its preparation and application Download PDFInfo
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Abstract
It the present invention relates to high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics and its prepares and applies, chemical composition is (Na0.5Bi0.5)(0.94‑x)(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3‑0.05x, wherein x=0.005~0.1, sample preparation uses solid-phase sintering, raw material is stoichiometrically subjected to dispensing, a ball milling and pre-sintering are carried out after mixing, ceramic green is obtained using compression moulding after secondary ball milling, granulation, and high quality ceramics sample is obtained through 1,120 1180 DEG C of high temperature sinterings.Bismuth-sodium titanate system lead-free ceramics prepared by the present invention are environmentally friendly material, and electrostriction coefficient is up to 0.035m4/C2, it is significantly better than traditional lead base electrostriction material, and there is excellent temperature stability, can be widely used for the manufacture electronic devices such as driver and displacement sensor.
Description
Technical field
The invention belongs to electrostriction ceramics field, electroluminescent stretched more particularly, to a kind of high-performance bismuth-sodium titanate system is unleaded
Contracting ceramics and its preparation method and application.
Background technology
Driver generally requires high strain output, the piezoelectric effect that this strain passes through ferroelectric material in use
Or electrostriction effect generates.Electrostriction refers to strain and a kind of linear effect of polarization intensity square of electric field induction
It answers, is expressed as：S=Q33P2.Electrostriction effect is widely present in dielectric material as a kind of basic electromechanical Coupling
In, there is important application in each fields such as MEMS (MEMS), high-precision sensor and shifters.Electrostriction effect
There are many advantages compared to traditional piezoelectric effect, without lag, excellent temperature stability, quickly sound under such as outer field excitation
Between seasonable and it is not necessarily to polarization process.
In traditional lead based relaxor ferroelectric material, such as Pb (Mg1/3Nb2/3)O3(PMN) and Pb (Zn1/3Nb2/3)O3(PZN)
Ceramics or monocrystalline etc., researcher is found that the electric field induced strain and 0.02m of 0.1% rank4/C2The electrostriction coefficient of left and right, should
Performance can meet application (F.Li, L.Jin, Z.Xu, S.Zhang, Electrostrictive the effect in of driver
ferroelectrics:an alternative approach to improve piezoelectricity,
Appl.Phys.Rev.2014,1:011103/1-21).However lead is a kind of toxic element, the lead oxide in traditional lead base ceramics
Accounting is up to 60% in gross mass, in the preparation of lead base ceramics and sintering process the volatilization of lead oxide can cause serious dirt
Dye, and lead enter human body after be not easy to eliminate, brain and nervous system will be made to be damaged, many national legislations thus are forbidden to use leaded
Electronic material.As European Union in 2003 has promulgated famous RoHS decrees；Japan passes through《Domestic electronic appliances recycle bill》；I
The Ministry of Information Industry of state put into effect in 2006《Electronics and IT products produce prevention and cure of pollution management method》And in 1 day March in 2007
It comes into force, it is desirable that use the harmful components such as lead, cadmium, sexivalent chromium in limitation electronic product comprehensively.In this context, numerous and confused both at home and abroad
Reinforce the research of lead-free piezoelectric material.
Bismuth-sodium titanate ((Bi0.5Na0.5)TiO3, BNT) be by the former Russian scholar Smolenskii et al. in 1961 for the first time
The compound substituted perovskite structure ferroelectric in the positions A of synthesis is the lead-free piezoelectric material for being most hopeful to replace plumbum-based material at present
One of.2007, Zhang etc. introduced third element KNN in BNT-BT systems, formed ternary system BNT-BT-KNN ceramics materials
Material, obtains up to 0.45% electric field induced strain, and the electrostriction coefficient of the system is also up to 0.026m4/C2, almost can be with
Traditional plumbum-based material compares favourably, this discovery opens one new research field of BNT base leadless piezoelectricities material, i.e. driver
With high accuracy displacement sensor (S.T.Zhang, A.B.Kounga, W.Jo, C.Jamin, K.Seifert, T.Granzow, J.D.Damjanovic,High-strain lead-free antiferroelectric electrostrictors,
Adv.Mater.2009,21:4716-4720).However the electrostriction coefficient for the bismuth-sodium titanate base ceramics reported at present is essentially
0.021~0.027m4/C2, for practical applications, which also needs to further increase, and electrostriction coefficient is in high temperature
Under temperature stability still need to improve.
Chinese patent CN105837205A discloses bismuth-sodium titanate system leadless piezoelectric ceramics and preparation method thereof, raw material
Component and its mole percent level are 0.96 (Bi0.5Na0.44-xK0.06Lix)TiO3-0.04BaTiO3, wherein x=0.005~
0.065.First by Bi2O3、K2CO3、Na2CO3、TiO2、Li2CO3And Ba2CO3, mixed ingredients, by ball milling, drying, in 850 DEG C
Pre-burning, after secondary ball milling, drying, granulation, molding, dumping, in 1100~1200 DEG C of sintering, using by silver and polarization
Afterwards, leadless piezoelectric ceramics is made.The patent is mainly adulterated by A Li and obtains high electric field induced strain, and this patent novelty
It introduces and has both A vacant and Lacking oxygen third element (Sr0.8Bi0.1)TiO2.95, effectively breaking substance system long-range ferroelectricity has
Sequence induces traversal relaxation phase near room temperature, and relaxation phase and ferroelectric phase can realize reversible transition under outer field excitation, generate
High electrostrictive property, and the performance is significantly better than lead base ceramics and the bismuth-sodium titanate base ceramics of other document reports,
There is highly important application prospect in the fields such as sensor and shifter.
Invention content
The purpose of the present invention is exactly to provide and a kind of can get high electroluminescent stretch to overcome the problems of the above-mentioned prior art
The bismuth-sodium titanate base lead-free of contracting coefficient and excellent temperature stability ceramics.
It is a further object of the present invention to provide the preparation methods of bismuth-sodium titanate system no-lead electrostrictive ceramics.
It is a further object of the present invention to provide the applications of bismuth-sodium titanate system no-lead electrostrictive ceramics.
The purpose of the present invention can be achieved through the following technical solutions：
High-performance bismuth-sodium titanate system no-lead electrostrictive ceramics, chemical composition are (Na0.5Bi0.5)(0.94-x)
(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, wherein x=0.005~0.1.
Preferably, 0.05 x, the component can mutually regulate and control traversal relaxation near room temperature, at this time relaxation phase and ferroelectric phase
Free energy it is very close, two-phase can effectively realize reversible transition off field outside, be generated in the compositional range of research highest
Electrostrictive property.
The preparation method of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics, uses solid sintering technology, specific steps
It is as follows：
(1) batch mixing：Choose the Bi that purity is more than 99wt%2O3、Na2CO3、BaCO3、ZrO2、SrCO3And TiO2As raw material,
According to (Na0.5Bi0.5)(0.94-x)(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, the wherein formula of x=0.005~0.1
Composition weighs raw material and uniformly mixes, and material powder is obtained after a ball milling；
(2) pre-burning：The material powder of step (1) is calcined into 4-8h at 800-900 DEG C, obtains pre-synthesis powder；
(3) secondary ball milling：The pre-synthesis powder of step (2) is subjected to secondary ball milling, fine particle size is obtained after drying
Powder；
(4) it is granulated and is molded：By PVA of the ceramic powder of step (3) through 8wt% is granulated, compression molding obtains ceramic blank
Body；
(5) by the green body of step (4) carry out dumping processing after, be sintered in confined conditions, sintering temperature be 1120~
1180 DEG C, 3-7 DEG C of heating rate/min, soaking time 2-4h obtains bismuth-sodium titanate system no-lead electrostrictive ceramics.
Step (1) uses absolute ethyl alcohol and ZrO in ball milling with step (3)2Ball is as ball-milling medium, ZrO2Ball and ball milling
The mass ratio of material is 1~1.5:1, the mass ratio 1~2.5 of absolute ethyl alcohol and raw material:1, control rotational speed of ball-mill 260- when ball milling
300r/min, Ball-milling Time 12-20h.The powder particles degree that ball milling obtains at the process conditions is moderate, it is possible to provide good burning
Tie driving force.It can make particle size excessive or too small outside this process parameters range, influence densification and the quality of ceramics sample,
And further decrease electrostrictive property.
Step (4) compression molding time control briquetting pressure be 60-100MPa, making obtain ceramic body be diameter 8~
12mm, the disk of 0.8~1mm of thickness.The ceramic body of compression moulding has moderate consistency, sintering at the process conditions
Obtained potsherd shrinks normal.Keep blank cracking, the too small potsherd that sintering can be made to obtain of pressure violent if pressure crosses conference
It shrinks, and then influences the electrostrictive property of ceramics.
The temperature of dumping processing in step (5) is 500-600 DEG C, soaking time 5-10h, and sintering temperature is preferably
1160 DEG C, soaking time is preferably 3h.The potsherd that dumping and sintering obtain at the process conditions has higher consistency
And electrostrictive property.Dump temperature is excessively high to lead to colloid melanism, increase the porosity and reduce the consistency of ceramics, dumping temperature
Spend it is low part colloid can be made to remain in green body, cause sintering when ceramic deformation crack.Sintering temperature is excessively high to make potsherd
Distorted deformation, sintering temperature is too low to make the reduction of potsherd consistency, can all reduce electrostrictive property.
Prepared high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics can be used in manufacturing driver and high-precision
Spend displacement sensor.
Compared with prior art, simple production process of the present invention and repeatable, the third element being added in substance system
(Sr0.8Bi0.1)TiO2.95A omissions and Lacking oxygen, these vacancy omissions can be introduced simultaneously can enhance random in Local Structure
, break original long-range ferroelectric order.In x=0.05 components, near room temperature generates traversal relaxation phase, applies and remove electricity
During, traverses relaxation phase and reversible transition occurs for ferroelectric phase, generate big electrostriction effect, Q33Coefficient is reachable
0.035m4/C2, it is significantly better than lead base ceramics and the bismuth-sodium titanate base ceramics of other reports.Simultaneously because the traversal relaxation mutually has
Higher stability so that electrostriction coefficient keeps stablizing in wide warm area of the room temperature to 120 DEG C.When x increases to 0.1, time
The too high levels for going through relaxation phase cause the response of system off field outside to reduce, i.e., electrostriction coefficient decreases.System of the present invention
Standby high-performance bismuth-sodium titanate system lead-free ceramics have high electrostriction coefficient, can be in the electronics such as driver and displacement controller
It is applied in device, the discovery of the new system is of great significance to substitution lead base electrostriction material.
Description of the drawings
Fig. 1 is the XRD spectrum of bismuth-sodium titanate system electrostriction ceramics made from embodiment 1 and embodiment 2；
Fig. 2 be embodiment 1 made from bismuth-sodium titanate system electrostriction ceramics room temperature and 120 DEG C at ferroelectric hysteresis loop and
Electric field induced strain schematic diagram；
Fig. 3 be embodiment 2 made from bismuth-sodium titanate system electrostriction ceramics room temperature and 120 DEG C at ferroelectric hysteresis loop and
Electric field induced strain schematic diagram；
Fig. 4 is bismuth-sodium titanate system electrostriction ceramics made from embodiment 1 and embodiment 2 at room temperature and 120 DEG C
Electrostriction schematic diagram；
Fig. 5 is the electrostriction coefficient of bismuth-sodium titanate system electrostriction ceramics made from embodiment 1 and embodiment 2 with temperature
The variation of degree.
Specific implementation mode
With reference to specific embodiment, the present invention is described in detail.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
Embodiment 1
A kind of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics and preparation method thereof, bismuth-sodium titanate base ceramics
Chemical composition is (Na0.5Bi0.5)(0.94-x)(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, wherein x=0.05, system
Preparation Method uses following steps：
(1) Bi that purity is more than 99% is chosen2O3、Na2CO3、BaCO3、ZrO2、SrCO3And TiO2As raw material, according to
(Na0.5Bi0.5)0.89(Sr0.8Bi0.1)0.05Ba0.06(Ti0.997Zr0.003)O2.9975Proportioning weigh raw material, after a ball milling
Obtain material powder；
(2) material powder is calcined into 4h at 850 DEG C, obtains pre-synthesis powder, and carry out secondary ball milling, is obtained after drying
Fine granular powder；
(3) PVA that 8wt% is added is granulated, and is pressed into ceramic body under 80MPa pressure, is arranged at 550 DEG C
Glue keeps the temperature 10h；
(4) ceramic body after dumping is sintered 3h in 1160 DEG C, obtains bismuth-sodium titanate system no-lead electrostrictive pottery
Porcelain.The ceramics can be applied in driver and displacement sensor.
Embodiment 2
A kind of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics and preparation method thereof, bismuth-sodium titanate base ceramics
Chemical composition is (Na0.5Bi0.5)(0.94-x)(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, wherein x=0.1, preparation
Method uses following steps：
(1) Bi that purity is more than 99% is chosen2O3、Na2CO3、BaCO3、ZrO2、SrCO3And TiO2As raw material, according to
((Na0.5Bi0.5)0.84(Sr0.8Bi0.1)0.1Ba0.06(Ti0.997Zr0.003)O2.995Proportioning weigh raw material, after a ball milling
Obtain material powder；
(2) material powder is calcined into 5h at 860 DEG C, obtains pre-synthesis powder, and carry out secondary ball milling, is obtained after drying
Fine granular powder；
(3) PVA that 8wt% is added is granulated, and is pressed into ceramic body under 80MPa pressure, is arranged at 550 DEG C
Glue keeps the temperature 10h；
(4) ceramic body after dumping is sintered 3h in 1180 DEG C, obtains bismuth-sodium titanate system no-lead electrostrictive pottery
Porcelain.It can be applied in driver and displacement sensor.
Embodiment 3
A kind of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics and preparation method thereof, bismuth-sodium titanate base ceramics
Chemical composition is (Na0.5Bi0.5)(0.94-x)(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, wherein x=0.01, system
Preparation Method uses following steps：
(1) Bi that purity is more than 99% is chosen2O3、Na2CO3、BaCO3、ZrO2、SrCO3And TiO2As raw material, according to
(Na0.5Bi0.5)0.93(Sr0.8Bi0.1)0.01Ba0.06(Ti0.997Zr0.003)O2.9995Proportioning weigh raw material, after a ball milling
Obtain material powder；
(2) material powder is calcined into 4h at 820 DEG C, obtains pre-synthesis powder, and carry out secondary ball milling, is obtained after drying
Fine granular powder；
(3) PVA that 8wt% is added is granulated, and is pressed into ceramic body under 80MPa pressure, is arranged at 550 DEG C
Glue keeps the temperature 10h；
(4) ceramic body after dumping is sintered 3h in 1140 DEG C, obtains bismuth-sodium titanate system no-lead electrostrictive pottery
Porcelain.
Embodiment 4
A kind of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics and preparation method thereof, bismuth-sodium titanate base ceramics
Chemical composition is (Na0.5Bi0.5)(0.94-x)(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, wherein x=0.02, system
Preparation Method uses following steps：
(1) Bi that purity is more than 99% is chosen2O3、Na2CO3、BaCO3、ZrO2、SrCO3And TiO2As raw material, according to
(Na0.5Bi0.5)0.92(Sr0.8Bi0.1)0.02Ba0.06(Ti0.997Zr0.003)O2.999Proportioning weigh raw material, after a ball milling
Obtain material powder；
(2) material powder is calcined into 4h at 830 DEG C, obtains pre-synthesis powder, and carry out secondary ball milling, is obtained after drying
Fine granular powder；
(3) PVA that 8wt% is added is granulated, and is pressed into ceramic body under 80MPa pressure, is arranged at 550 DEG C
Glue keeps the temperature 10h；
(4) ceramic body after dumping is sintered 3h in 1150 DEG C, obtains bismuth-sodium titanate system no-lead electrostrictive pottery
Porcelain.
Embodiment 5
A kind of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics and preparation method thereof, bismuth-sodium titanate base ceramics
Chemical composition is (Na0.5Bi0.5)(0.94-x)(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, wherein x=0.03, system
Preparation Method uses following steps：
(1) Bi that purity is more than 99% is chosen2O3、Na2CO3、BaCO3、ZrO2、SrCO3And TiO2As raw material, according to
(Na0.5Bi0.5)0.91(Sr0.8Bi0.1)0.03Ba0.06(Ti0.997Zr0.003)O2.9985Proportioning weigh raw material, after a ball milling
Obtain material powder；
(2) material powder is calcined into 4h at 840 DEG C, obtains pre-synthesis powder, and carry out secondary ball milling, is obtained after drying
Fine granular powder；
(3) PVA that 8wt% is added is granulated, and is pressed into ceramic body under 80MPa pressure, is arranged at 550 DEG C
Glue keeps the temperature 10h；
(4) ceramic body after dumping is sintered 3h in 1150 DEG C, obtains bismuth-sodium titanate system no-lead electrostrictive pottery
Porcelain.
Embodiment 6
High-performance bismuth-sodium titanate system no-lead electrostrictive ceramics, chemical composition are (Na0.5Bi0.5)0.94
(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, wherein x=0.005.
This kind of ceramic material is prepared using solid sintering technology, is as follows：
(1) batch mixing：Choose the Bi that purity is more than 99wt%2O3、Na2CO3、BaCO3、ZrO2、SrCO3And TiO2As raw material,
According to (Na0.5Bi0.5)(0.94-x)(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, wherein x=0.005, formula composition
It weighs raw material and uniformly mixes, material powder is obtained after a ball milling, using absolute ethyl alcohol and ZrO2Ball is situated between as ball milling
Matter, ZrO2The mass ratio of ball and ball milling material is 1:1, the mass ratio 1 of absolute ethyl alcohol and raw material:1, when ball milling, controls rotational speed of ball-mill
260r/min, Ball-milling Time 20h；
(2) pre-burning：The material powder of step (1) is calcined into 8h at 800 DEG C, obtains pre-synthesis powder；
(3) secondary ball milling：The pre-synthesis powder of step (2) is subjected to secondary ball milling, technological parameter is identical as a ball milling,
The powder of fine particle size is obtained after drying；
(4) it is granulated and is molded：PVA of the ceramic powder of step (3) through 8wt% is granulated, control pressure is molded for 60MPa
Molding obtains ceramic body, and shape is diameter 8mm, the disk of thickness 0.8mm；
(5) green body of step (4) is subjected to dumping processing, controlled at 500 DEG C, soaking time 10h, in closed item
It is sintered under part, sintering temperature is 1120 DEG C, and it is unleaded electroluminescent to obtain bismuth-sodium titanate system by heating rate 3 DEG C/min, soaking time 4h
Electrostrictive Ceramic, this kind of ceramic material can be used in manufacturing driver and high accuracy displacement sensor.
Embodiment 7
High-performance bismuth-sodium titanate system no-lead electrostrictive ceramics, chemical composition are (Na0.5Bi0.5)(0.94-x)
(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, wherein x=0.008.
This kind of ceramic material is prepared using solid sintering technology, is as follows：
(1) batch mixing：Choose the Bi that purity is more than 99wt%2O3、Na2CO3、BaCO3、ZrO2、SrCO3And TiO2As raw material,
According to (Na0.5Bi0.5)(0.94-x)(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, wherein x=0.008, formula composition
It weighs raw material and uniformly mixes, material powder is obtained after a ball milling, using absolute ethyl alcohol and ZrO2Ball is situated between as ball milling
Matter, ZrO2The mass ratio of ball and ball milling material is 1.5:1, the mass ratio 2.5 of absolute ethyl alcohol and raw material:1, control ball milling turns when ball milling
Fast 300r/min, Ball-milling Time 12h；
(2) pre-burning：The material powder of step (1) is calcined into 4h at 900 DEG C, obtains pre-synthesis powder；
(3) secondary ball milling：The pre-synthesis powder of step (2) is subjected to secondary ball milling, technological parameter is identical as a ball milling,
The powder of fine particle size is obtained after drying；
(4) it is granulated and is molded：PVA of the ceramic powder of step (3) through 8wt% is granulated, control pressure is 100MPa moulds
Molded to obtain ceramic body, shape is diameter 12mm, the disk of thickness 1mm；
(5) green body of step (4) is subjected to dumping processing, controlled at 600 DEG C, soaking time 5h, in closed item
It is sintered under part, sintering temperature is 1130 DEG C, and it is unleaded electroluminescent to obtain bismuth-sodium titanate system by heating rate 4 DEG C/min, soaking time 2h
Electrostrictive Ceramic, this kind of ceramic material can be used in manufacturing driver and high accuracy displacement sensor.
Fig. 1 is the XRD spectrum of bismuth-sodium titanate system electrostriction ceramics embodiment 1 and embodiment 2 prepared by the present invention, system
Pure perovskite phase structure is presented in standby ceramics, and no second phase generates, and all diffraction maximums are unimodal, show 1 He of embodiment
The component of embodiment 2 is counterfeit cube of phase structure.
Fig. 2 is electric hysteresis of the bismuth-sodium titanate system electrostriction ceramics embodiment 1 of the invention prepared at room temperature and 120 DEG C
Loop line and electric field induced strain schematic diagram, test electric field are 6kV/mm.When room temperature, shape electric hysteresis of girdling the waist is presented in ceramics prepared by embodiment 1
Loop line and rudiment type electric field induced strain curve show it for traversal relaxation phase structure.When temperature rises to 120 DEG C, polarization intensity and answer
Variate decreases, while hysteresis is significantly reduced.
Fig. 3 is electric hysteresis of the bismuth-sodium titanate system electrostriction ceramics embodiment 2 of the invention prepared at room temperature and 120 DEG C
Loop line and electric field induced strain schematic diagram.When room temperature, curve shape is same as Example 1, but polarization intensity and strain value all reduce, table
The bright traversal relaxation phase content higher in the component.At 120 DEG C, the hysteresis of curve is substantially reduced.
Fig. 4 is bismuth-sodium titanate system electrostriction ceramics made from embodiment 1 and embodiment 2 at room temperature and 120 DEG C
Electrostriction schematic diagram.At room temperature strain and polarization intensity square be almost linear relationship, the electrostriction system of embodiment 1
Number Q33Value reaches 0.035m4/C2, it is significantly better than the bismuth-sodium titanate base ceramics of traditional lead base ceramics and report.The electricity of embodiment 2
Coefficient of dilatation is caused to be reduced to 0.0245m4/C2.At a high temperature of 120 DEG C, the slope of curve of embodiment 1 and embodiment 2 is not apparent
Variation.
Fig. 5 is the electrostriction coefficient of bismuth-sodium titanate system electrostriction ceramics made from embodiment 1 and embodiment 2 with temperature
The variation of degree.In wide warm area of the room temperature to 120 DEG C, the Q of embodiment 1 and embodiment 233Value keeps almost unchanged, presents excellent
Temperature stability.Wherein, the electrostrictive property of embodiment 1 is significantly better than traditional lead base electrostriction material and others
Bismuth-sodium titanate base ceramics, this is also the sharpest edges of the present invention, shows the novel bismuth-sodium titanate system electrostriction ceramics prepared
It disclosure satisfy that practical application request, be expected to substitution plumbum-based material and answered in the electronic devices such as driver and high precision displacement device
With.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (10)
1. high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics, which is characterized in that its chemical composition is
(Na0.5Bi0.5)(0.94-x)(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, wherein x=0.005~0.1.
2. high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics according to claim 1, which is characterized in that x is preferred
0.05。
3. the preparation method of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics as described in claim 1, which is characterized in that
Using solid sintering technology, it is as follows：
(1) batch mixing：Choose the Bi that purity is more than 99wt%2O3、Na2CO3、BaCO3、ZrO2、SrCO3And TiO2As raw material, according to
(Na0.5Bi0.5)(0.94-x)(Sr0.8Bi0.1)xBa0.06(Ti0.997Zr0.003)O3-0.05x, the wherein formula composition of x=0.005~0.1
It weighs raw material and uniformly mixes, material powder is obtained after a ball milling；
(2) pre-burning：The material powder of step (1) is calcined into 4-8h at 800-900 DEG C, obtains pre-synthesis powder；
(3) secondary ball milling：The pre-synthesis powder of step (2) is subjected to secondary ball milling, the powder of fine particle size is obtained after drying；
(4) it is granulated and is molded：By PVA of the ceramic powder of step (3) through 8wt% is granulated, compression molding obtains ceramic body；
(5) it after the green body of step (4) being carried out dumping processing, being sintered in confined conditions, sintering temperature is 1120~1180 DEG C,
3-7 DEG C of heating rate/min, soaking time 2-4h obtain bismuth-sodium titanate system no-lead electrostrictive ceramics.
4. the preparation method of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics according to claim 3, feature
It is, step (1) uses absolute ethyl alcohol and ZrO in ball milling with step (3)2Ball is as ball-milling medium, ZrO2Ball and ball milling material
Mass ratio is 1~1.5:1, the mass ratio 1~2.5 of absolute ethyl alcohol and raw material:1.
5. the preparation method of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics according to claim 3, feature
It is, step (1) controls rotational speed of ball-mill 260-300r/min, Ball-milling Time 12-20h in ball milling with step (3).
6. the preparation method of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics according to claim 3, feature
It is, step (4) is 60-100MPa in compression molding time control briquetting pressure.
7. the preparation method of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics according to claim 3, feature
It is, it is 8~12mm of diameter, the disk of 0.8~1mm of thickness that step (4) making, which obtains ceramic body,.
8. the preparation method of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics according to claim 3, feature
It is, the temperature of the dumping processing in step (5) is 500-600 DEG C, soaking time 5-10h.
9. the preparation method of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics according to claim 3, feature
It is, the sintering temperature in step (5) is preferably 1160 DEG C, and soaking time is preferably 3h.
10. the application of high-performance bismuth-sodium titanate system no-lead electrostrictive ceramics as described in claim 1, which is characterized in that should
Bismuth-sodium titanate base electrostriction ceramics can be used in manufacturing driver and high accuracy displacement sensor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109534810A (en) * | 2018-12-13 | 2019-03-29 | 同济大学 | Bismuth-sodium titanate base lead-free driver ceramics and its preparation method and application |
| CN109534810B (en) * | 2018-12-13 | 2022-04-05 | 同济大学 | Sodium bismuth titanate-based lead-free driver ceramic and preparation method and application thereof |
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