CN102951922A - Method for preparing barium titanate porous ceramic by freeze pouring method - Google Patents
Method for preparing barium titanate porous ceramic by freeze pouring method Download PDFInfo
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- CN102951922A CN102951922A CN2012104929249A CN201210492924A CN102951922A CN 102951922 A CN102951922 A CN 102951922A CN 2012104929249 A CN2012104929249 A CN 2012104929249A CN 201210492924 A CN201210492924 A CN 201210492924A CN 102951922 A CN102951922 A CN 102951922A
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- 229910002113 barium titanate Inorganic materials 0.000 title claims abstract description 53
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 239000000919 ceramic Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000007710 freezing Methods 0.000 claims abstract description 50
- 230000008014 freezing Effects 0.000 claims abstract description 50
- 239000002002 slurry Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 235000015895 biscuits Nutrition 0.000 claims abstract description 15
- 239000008367 deionised water Substances 0.000 claims abstract description 15
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 15
- 238000001354 calcination Methods 0.000 claims abstract description 14
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 12
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 12
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 29
- 238000005245 sintering Methods 0.000 claims description 22
- 238000005266 casting Methods 0.000 claims description 20
- 238000009413 insulation Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 18
- 239000000758 substrate Substances 0.000 claims description 18
- 239000003507 refrigerant Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000000498 ball milling Methods 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000005057 refrigeration Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 6
- 239000011148 porous material Substances 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 5
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 239000002270 dispersing agent Substances 0.000 abstract 1
- 238000004108 freeze drying Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007777 multifunctional material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
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Abstract
The invention provides a method for preparing a barium titanate porous ceramic by a freeze pouring method. The method comprises the following steps of: mixing a dispersing agent kaolin and a molding agent polyvinyl alcohol with barium titanate powder, and then, adding deionized water to prepare into slurry with a certain solid content; pouring the slurry into a mold, and freezing for 2 h at -40 DEG C; after the slurry is completely frozen, demolding, and putting in a freeze drier to dry for 24 h; and calcining an obtained biscuit at 1210-1250 DEG C to prepare the barium titanate porous ceramic. By using the method, the barium titanate porous ceramic is prepared by adopting a freeze drying method. Not only is the preparation cost low, is the operation simple, is the method environment-friendly, and does the pollution not exist, but also the porosity ratio of the ceramic after calcination is high, and the pore size distribution is uniform.
Description
Technical field
The invention belongs to the preparation field of porous ceramics, particularly a kind of freezing casting prepares the method for barium titanate porous ceramics.
Background technology
Barium titanate has high-k and the excellent electric property such as ferroelectric, piezoelectricity and positive temperature coefficient effect, be widely used in the electron trade: the barium titanate ceramics material is a kind of piezoelectric ceramics commonly used, can be used for making the aspects such as oscillator, acoustic measurement device and wave filter of sonar equipment; Barium titanate ceramics after the doping is positive temperature coefficient thermal sensitive ceramic material (ptc material), can be used as temperature sensor; The existing wet sensitive characteristic of a certain proportion of barium titanate-strontium titanate ceramics has again temperature-sensing property, can be as multifunctional material.Along with the development of society, more and more higher to the requirement of components and parts sensitivity, some piezoelectricity, temperature-sensitive and humidity-sensitive material begin to turn to the vesicular structure development.
Introduced in mutually at barium titanate have low density, low-dielectric with without the air of piezoelectric activity mutually, with respect to fine and close barium titanate ceramics, can obtain high hydrostatic figures of merit, low specific acoustic resistance, and good acoustic transducer performance, the piezoelectric property of raising piezoelectric ceramics.Porosity, the distribution situation in hole and duct shape have a great impact the performance of porous ceramics.In order to obtain porosity height, the uniform porous barium titanate ceramics of pore distribution, in succession adopted extrinsion pressing, add the pore-forming material method, foaming, sol-gel method, foam impregnation method etc.Above method or complicated operation perhaps are exactly complex process, poor repeatability.
Summary of the invention
The object of the invention is to overcome the shortcoming of aforesaid method, provide a kind of freezing casting to prepare the method for barium titanate porous ceramics, simple to operate, the barium titanate porous ceramics porosity of preparing is high, pore distribution is even and the duct is oriented alignment.
For achieving the above object, the technical solution used in the present invention is:
A kind of freezing casting prepares the method for barium titanate porous ceramics, may further comprise the steps:
(1). in the mixture of kaolin, polyvinyl alcohol and barium carbonate powder, add deionized water, mix, make slip; The mass ratio of barium titanate, kaolin and polyvinyl alcohol is (90 ~ 92) in the described mixture: (4 ~ 8): (2 ~ 4); The mass ratio of mixture and deionized water is (30 ~ 50): (50 ~ 70);
(2). slip is poured in the mould, and it is fully freezing to slurry that mould is put into refrigerant, obtains freezing base substrate;
(3). the freezing base substrate demoulding is dry, obtain biscuit;
(4). biscuit in calcining, is made the barium titanate porous ceramics.
The present invention further improves and is: adopt ball milled to mix to get slurry in the step (1), Ball-milling Time is 4h.
The present invention further improves and is: the mould described in the step (2) is the cylinder shape mould of sealed bottom; The post jamb material of mould is urethane, and base material is copper.
The present invention further improves and is: refrigerant described in the step (2) adopts-40 ℃ dehydrated alcohol.
The present invention further improves and is: the time of the refrigeration operation described in the step (2) is 2h.
The present invention further improves and is: carry out drying in the step (3) and be specially: it is dry that the freeze drier low-temp low-pressure is put in the freezing base substrate demoulding.
The present invention further improves and is: described low-temp low-pressure is dry to be at 0 ℃, dry 24h under the vacuum tightness of 0.01MPa.
The present invention further improves and is: following sintering schedule is adopted in the calcining described in the step (4): heat-up rate is 2 ℃/min in the time of 20 ~ 500 ℃; In 500 ℃ of insulation 1h; Heat-up rate is 4 ℃/min in the time of 500 ~ 900 ℃; Heat-up rate is 5 ℃/min during 900 ~ sintering temperature; In sintering temperature insulation 1h; Then cooling, cooling rate is 4 ℃/min during sintering temperature ~ 500 ℃; Described sintering temperature is 1210 ~ 1250 ℃.
The present invention further improves and is: the mass ratio of mixture is 90:8:2 in the step (1); The mass ratio of mixture and deionized water is 40:60; Following sintering schedule is adopted in calcining described in the step (4): heat-up rate is 2 ℃/min in the time of 20 ~ 500 ℃; In 500 ℃ of insulation 1h; Heat-up rate is 4 ℃/min in the time of 500 ~ 900 ℃; Heat-up rate is 5 ℃/min in the time of 900 ~ 1210 ℃; In 1210 ℃ of insulation 1h; Then cooling, cooling rate is 4 ℃/min in the time of 1210 ~ 500 ℃, makes the barium titanate porous ceramics.
The present invention further improves and is: refrigerant temperature described in the step (2) is equal to or less than-40 ℃.
With respect to prior art, beneficial effect of the present invention is: the present invention adopts freezing casting to prepare the barium titanate porous ceramics, in kaolin, polyvinyl alcohol and barium carbonate powder, add deionized water, mix and make slurry, wherein kaolin is that dispersion agent, polyvinyl alcohol are forming agent, slurry obtains the barium titanate ceramics of vesicular structure at last successively through freezing, drying and calcination process.In this process, the ice that the deionized water that adds is formed after freezing is template of the present invention, because it is freezing that slurry mixes rear, so ice is evenly distributed in the base substrate of freezing rear formation, form vesicular structure behind base substrate drying and the calcining removal ice wherein.The present invention adopts ice for template, have freezing rapidly, forming and free of contamination advantage, and the porous ceramics pore distribution that makes is even, porosity is high, vesicular structure is sheet, the duct is oriented alignment.The present invention is simple to operate, and repeatability is strong.
Description of drawings
Fig. 1 is the SEM figure by the barium titanate porous ceramics end face of the embodiment of the invention 1 preparation;
Fig. 2 is the SEM figure by the barium titanate porous ceramics side of the embodiment of the invention 1 preparation.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing:
Embodiment 1:
A kind of freezing casting prepares the method for barium titanate porous ceramics, may further comprise the steps:
(1). get barium titanate, kaolin and polyvinyl alcohol that mass ratio is 90:8:2, be mixed to get mixture, mixture is put in the ball grinder, the deionized water that adds 1.5 times of mixture qualities, ball milling four hours makes slurry, and wherein mixture quality accounts for 40% of slurry total mass in the slurry;
(2). slip is poured in the mould, mould is put into refrigerant again and be-40 ℃ dehydrated alcohol, freezing 2h obtains freezing base substrate; Described mould is the cylinder shape mould of sealed bottom; The post jamb material of mould is urethane, and base material is copper;
(3). with the freezing base substrate demoulding and put into freeze drier, at 0 ℃, dry 24h obtains biscuit under the vacuum tightness of 0.01MPa;
(4). biscuit is calcined under 1210 ℃ sintering temperature, and following sintering schedule is adopted in calcining: heat-up rate is 2 ℃/min in the time of 20 ~ 500 ℃; In 500 ℃ of insulation 1h; Heat-up rate is 4 ℃/min in the time of 500 ~ 900 ℃; Heat-up rate is 5 ℃/min in the time of 900 ~ 1210 ℃; In 1210 ℃ of insulation 1h; Cooling rate is 4 ℃/min in the time of 1210 ~ 500 ℃, can obtain the barium titanate porous ceramics.
Fig. 1 and Fig. 2 are respectively the barium titanate porous ceramics end face of embodiment 1 preparation and the SEM figure of side, can find out that from Fig. 1 and Fig. 2 the pore distribution of the barium titanate porous ceramics that makes is even, and porosity is high, and vesicular structure is sheet, and the duct is oriented alignment.
Embodiment 2:
A kind of freezing casting prepares the method for barium titanate porous ceramics, may further comprise the steps:
(1). get barium titanate, kaolin and polyvinyl alcohol that mass ratio is 92:5:3, be mixed to get mixture, mixture is put in the ball grinder, add deionized water, ball milling four hours makes slurry, and wherein mixture quality accounts for 45% of slurry total mass in the slurry;
(2). slip is poured in the mould, mould is put into refrigerant again and be-40 ℃ dehydrated alcohol, freezing 2h obtains freezing base substrate; Described mould is the cylinder shape mould of sealed bottom; The post jamb material of mould is urethane, and base material is copper;
(3). with the freezing base substrate demoulding and put into freeze drier, at 0 ℃, dry 24h obtains biscuit under the vacuum tightness of 0.01MPa;
(4). biscuit is calcined under 1240 ℃ sintering temperature, and following sintering schedule is adopted in calcining: heat-up rate is 2 ℃/min in the time of 20 ~ 500 ℃; In 500 ℃ of insulation 1h; Heat-up rate is 4 ℃/min in the time of 500 ~ 900 ℃; Heat-up rate is 5 ℃/min in the time of 900 ~ 1240 ℃; In 1240 ℃ of insulation 1h; Cooling rate is 4 ℃/min in the time of 1240 ~ 500 ℃, can obtain the barium titanate porous ceramics.
Embodiment 3:
A kind of freezing casting prepares the method for barium titanate porous ceramics, may further comprise the steps:
(1). get barium titanate, kaolin and polyvinyl alcohol that mass ratio is 91:6:3, be mixed to get mixture, mixture is put in the ball grinder, add deionized water, ball milling four hours makes slurry, and wherein mixture quality accounts for 30% of slurry total mass in the slurry;
(2). slip is poured in the mould, mould is put into refrigerant again and be-40 ℃ dehydrated alcohol, freezing 2h obtains freezing base substrate; Described mould is the cylinder shape mould of sealed bottom; The post jamb material of mould is urethane, and base material is copper;
(3). with the freezing base substrate demoulding and put into freeze drier, at 0 ℃, dry 24h obtains biscuit under the vacuum tightness of 0.01MPa;
(4). biscuit is calcined under 1230 ℃ sintering temperature, and following sintering schedule is adopted in calcining: heat-up rate is 2 ℃/min in the time of 20 ~ 500 ℃; In 500 ℃ of insulation 1h; Heat-up rate is 4 ℃/min in the time of 500 ~ 900 ℃; Heat-up rate is 5 ℃/min in the time of 900 ~ 1230 ℃; In 1230 ℃ of insulation 1h; Cooling rate is 4 ℃/min in the time of 1230 ~ 500 ℃, can obtain the barium titanate porous ceramics.
Embodiment 4:
A kind of freezing casting prepares the method for barium titanate porous ceramics, may further comprise the steps:
(1). get barium titanate, kaolin and polyvinyl alcohol that mass ratio is 91:7:2, be mixed to get mixture, mixture is put in the ball grinder, add deionized water, ball milling four hours makes slurry, and wherein mixture quality accounts for 35% of slurry total mass in the slurry;
(2). slip is poured in the mould, mould is put into refrigerant again and be-40 ℃ dehydrated alcohol, freezing 2h obtains freezing base substrate; Described mould is the cylinder shape mould of sealed bottom; The post jamb material of mould is urethane, and base material is copper;
(3). with the freezing base substrate demoulding and put into freeze drier, at 0 ℃, dry 24h obtains biscuit under the vacuum tightness of 0.01MPa;
(4). biscuit is calcined under 1220 ℃ sintering temperature, and following sintering schedule is adopted in calcining: heat-up rate is 2 ℃/min in the time of 20 ~ 500 ℃; In 500 ℃ of insulation 1h; Heat-up rate is 4 ℃/min in the time of 500 ~ 900 ℃; Heat-up rate is 5 ℃/min in the time of 900 ~ 1220 ℃; In 1220 ℃ of insulation 1h; Cooling rate is 4 ℃/min in the time of 1220 ~ 500 ℃, can obtain the barium titanate porous ceramics.
Embodiment five
A kind of freezing casting prepares the method for barium titanate porous ceramics, may further comprise the steps:
(1). get barium titanate, kaolin and polyvinyl alcohol that mass ratio is 92:4:4, be mixed to get mixture, mixture is put in the ball grinder, add deionized water, ball milling four hours makes slurry, and wherein mixture quality accounts for 50% of slurry total mass in the slurry;
(2). slip is poured in the mould, mould is put into refrigerant again and be-40 ℃ dehydrated alcohol, freezing 2h obtains freezing base substrate; Described mould is the cylinder shape mould of sealed bottom; The post jamb material of mould is urethane, and base material is copper;
(3). with the freezing base substrate demoulding and put into freeze drier, at 0 ℃, dry 24h obtains biscuit under the vacuum tightness of 0.01MPa;
(4). biscuit is calcined under 1250 ℃ sintering temperature, and following sintering schedule is adopted in calcining: heat-up rate is 2 ℃/min in the time of 20 ~ 500 ℃; In 500 ℃ of insulation 1h; Heat-up rate is 4 ℃/min in the time of 500 ~ 900 ℃; Heat-up rate is 5 ℃/min in the time of 900 ~ 1250 ℃; In 1250 ℃ of insulation 1h; Cooling rate is 4 ℃/min in the time of 1250 ~ 500 ℃, can obtain the barium titanate porous ceramics.
Refrigerant in the step of the present invention (2) can also be selected other the refrigerant such as liquid nitrogen except dehydrated alcohol, as long as can the deionized water in the slurry is freezing, be preferably temperature and be equal to or less than-40 ℃ refrigerant.
The above only is one embodiment of the present invention, it or not whole or unique embodiment, the conversion of any equivalence that the logical technician in this area takes technical solution of the present invention by reading specification sheets of the present invention is claim of the present invention and contains.
Claims (10)
1. a freezing casting prepares the method for barium titanate porous ceramics, it is characterized in that, may further comprise the steps:
(1). in the mixture of kaolin, polyvinyl alcohol and barium carbonate powder, add deionized water, mix, make slip; The mass ratio of barium titanate, kaolin and polyvinyl alcohol is (90 ~ 92) in the described mixture: (4 ~ 8): (2 ~ 4); The mass ratio of mixture and deionized water is (30 ~ 50): (50 ~ 70);
(2). slip is poured in the mould, and it is fully freezing to slurry that mould is put into refrigerant, obtains freezing base substrate;
(3). the freezing base substrate demoulding is dry, obtain biscuit;
(4). biscuit is calcined again, made the barium titanate porous ceramics.
2. freezing casting according to claim 1 prepares the method for barium titanate porous ceramics, it is characterized in that, adopts ball milled to mix to get slurry in the step (1), and Ball-milling Time is 4h.
3. freezing casting according to claim 1 prepares the method for barium titanate porous ceramics, it is characterized in that, the mould described in the step (2) is the cylinder shape mould of sealed bottom; The post jamb material of mould is urethane, and base material is copper.
4. freezing casting according to claim 1 prepares the method for barium titanate porous ceramics, it is characterized in that, refrigerant described in the step (2) adopts-40 ℃ dehydrated alcohol.
5. freezing casting according to claim 1 prepares the method for barium titanate porous ceramics, it is characterized in that, the time of the refrigeration operation described in the step (2) is 2h.
6. freezing casting according to claim 1 prepares the method for barium titanate porous ceramics, it is characterized in that, carries out drying in the step (3) and is specially: it is dry that the freeze drier low-temp low-pressure is put in the freezing base substrate demoulding.
7. freezing casting according to claim 6 prepares the method for barium titanate porous ceramics, it is characterized in that, described low-temp low-pressure drying is at 0 ℃, dry 24h under the vacuum tightness of 0.01MPa.
8. freezing casting according to claim 1 prepares the method for barium titanate porous ceramics, it is characterized in that, following sintering schedule is adopted in the calcining described in the step (4): heat-up rate is 2 ℃/min in the time of 20 ~ 500 ℃; In 500 ℃ of insulation 1h; Heat-up rate is 4 ℃/min in the time of 500 ~ 900 ℃; Heat-up rate is 5 ℃/min during 900 ~ sintering temperature; In sintering temperature insulation 1h; Then cooling, cooling rate is 4 ℃/min during sintering temperature ~ 500 ℃; Described sintering temperature is 1210 ~ 1250 ℃.
9. freezing casting according to claim 1 prepares the method for barium titanate porous ceramics, it is characterized in that, the mass ratio of mixture is 90:8:2 in the step (1); The mass ratio of mixture and deionized water is 40:60; Following sintering schedule is adopted in calcining described in the step (4): heat-up rate is 2 ℃/min in the time of 20 ~ 500 ℃; In 500 ℃ of insulation 1h; Heat-up rate is 4 ℃/min in the time of 500 ~ 900 ℃; Heat-up rate is 5 ℃/min in the time of 900 ~ 1210 ℃; In 1210 ℃ of insulation 1h; Then cooling, cooling rate is 4 ℃/min in the time of 1210 ~ 500 ℃, makes the barium titanate porous ceramics.
10. freezing casting according to claim 1 prepares the method for barium titanate porous ceramics, it is characterized in that, refrigerant temperature described in the step (2) is equal to or less than-40 ℃.
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| CN105347846A (en) * | 2015-12-01 | 2016-02-24 | 西南大学 | Method for preparing ceramic/resin piezoelectric compound |
| CN105924154A (en) * | 2016-04-22 | 2016-09-07 | 西安科技大学 | Preparation method for lead-free piezoelectric composite material used for sensor |
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| CN112390653A (en) * | 2020-11-16 | 2021-02-23 | 中国工程物理研究院材料研究所 | Method for preparing ceramic powder based on freezing casting molding |
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| CN103319182A (en) * | 2013-07-04 | 2013-09-25 | 清华大学 | High-performance solid oxide electrolytic tank support |
| CN103319182B (en) * | 2013-07-04 | 2014-12-24 | 清华大学 | High-performance solid oxide electrolytic tank support |
| CN107922275A (en) * | 2015-08-07 | 2018-04-17 | 陶瓷技术有限责任公司 | Leadless piezoelectric ceramics is manufactured in aqueous environments |
| CN107922275B (en) * | 2015-08-07 | 2021-08-17 | 陶瓷技术有限责任公司 | Production of lead-free piezoelectric ceramics in aqueous environment |
| CN105347846A (en) * | 2015-12-01 | 2016-02-24 | 西南大学 | Method for preparing ceramic/resin piezoelectric compound |
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| WO2017121203A1 (en) * | 2016-01-11 | 2017-07-20 | 苏州大学张家港工业技术研究院 | Micrometer/nanometer silver-loaded barium titanate foam ceramic and preparation method therefor |
| US10882797B2 (en) | 2016-01-11 | 2021-01-05 | Soochow University | Barium titanate foam ceramics loaded with micro/nano silver and preparation method thereof |
| CN105924154A (en) * | 2016-04-22 | 2016-09-07 | 西安科技大学 | Preparation method for lead-free piezoelectric composite material used for sensor |
| CN110948645A (en) * | 2019-11-26 | 2020-04-03 | 杭州电子科技大学 | Bar manufacturing device |
| CN110948645B (en) * | 2019-11-26 | 2021-06-29 | 杭州电子科技大学 | Bar manufacturing device |
| CN112390653A (en) * | 2020-11-16 | 2021-02-23 | 中国工程物理研究院材料研究所 | Method for preparing ceramic powder based on freezing casting molding |
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Effective date of registration: 20201218 Address after: 224000 Qingyang Road (within Qingdun Office), Nanyang Town, Tinghu District, Yancheng City, Jiangsu Province (8) Patentee after: Yancheng Qinglong Jinbang water Co.,Ltd. Address before: 518000 No.6 Qinglong Road, Qinglong Road, Qinghua community, Longhua street, Longhua District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Pengbo Information Technology Co.,Ltd. Effective date of registration: 20201218 Address after: 518000 No.6 Qinglong Road, Qinglong Road, Qinghua community, Longhua street, Longhua District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Pengbo Information Technology Co.,Ltd. Address before: No. 1, Weiyang District university garden, Xi'an, Shaanxi Province, Shaanxi Patentee before: SHAANXI University OF SCIENCE & TECHNOLOGY |
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Correction item: Patentee|Address Correct: Yancheng Qingdun Jinbang Water Affairs Co., Ltd.|224000 Qingyang Road, Nanyang Town, Tinghu District, Yancheng City, Jiangsu Province (in Qingdun Office) (8) False: Yancheng Qingyi Jinbang Water Co., Ltd.|224000 Qingyang Road, Nanyang Town, Tinghu District, Yancheng City, Jiangsu Province (in Qingdun Office) (8) Number: 01-01 Volume: 37 |
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