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High-tetragonal-phase barium titanate powder, method for preparing same, barium titanate thick-film ceramic, method for preparing same and application of barium titanate thick-film ceramic

A technology of phase barium titanate and barium titanate, applied in the field of high tetragonal phase barium titanate powder and its preparation, barium titanate thick film ceramics and its preparation, can solve the problem of large particle size and low activity of barium titanate powder , serious agglomeration of barium titanate powder and other problems, to achieve the effect of high dielectric constant, improved performance and good electrical characteristics

Inactive Publication Date: 2018-08-21
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a kind of high tetragonal phase barium titanate powder and its preparation method, barium titanate thick film ceramics and its preparation method and application, for solving the particle size of barium titanate powder prepared by solid phase method Larger, and the barium titanate powder is seriously agglomerated and has low activity, so it is impossible to prepare ultra-thin and thick-film ceramics.

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  • High-tetragonal-phase barium titanate powder, method for preparing same, barium titanate thick-film ceramic, method for preparing same and application of barium titanate thick-film ceramic
  • High-tetragonal-phase barium titanate powder, method for preparing same, barium titanate thick-film ceramic, method for preparing same and application of barium titanate thick-film ceramic
  • High-tetragonal-phase barium titanate powder, method for preparing same, barium titanate thick-film ceramic, method for preparing same and application of barium titanate thick-film ceramic

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preparation example Construction

[0064] The present invention also provides the preparation method of the high tetragonal phase barium titanate powder of the above technical scheme, comprising the following steps:

[0065] Ba(CH 3 COO) 2 and KOH aqueous solution and Ti(C 4 h 9 O) 4 mixed with the ethanol solution, heated and stirred, and subjected to hydrothermal reaction to obtain high tetragonal phase barium titanate powder.

[0066] In the present invention, the temperature of heating and stirring is 60°C to 80°C;

[0067] The stirring speed of heating and stirring is 100rpm~1000rpm;

[0068] The reaction temperature of the hydrothermal reaction is to first raise the temperature to 80°C-100°C and keep it warm for 10h-20h, then raise the temperature to 160°C-240°C and keep it warm for 60h-100h.

[0069] In the present invention, the molar ratio of Ba ions to Ti ions is 2 to 3:1; the heating and stirring is preferably heating and stirring in a water bath; the hydrothermal reaction is preferably placed ...

Embodiment 1

[0096] 0.5mol Ba(CH 3 COO) 2 Mix with 2mol KOH and dissolve in 35ml deionized water, the concentration of 0.5mol KOH is 2mol / L, stir magnetically at 75°C for 10min to obtain a barium hydroxide solution. Ti(C 4 h 9 O) 4 Dissolve in absolute ethanol, stir magnetically at 75°C for 15 minutes to obtain Ti(C 4 h 9 O) 4 ethanol solution. Barium hydroxide solution and Ti(C 4 h 9 O) 4 Mix the ethanol solution, the molar ratio of Ba ions and Ti ions is 3:1, magnetically stir at 75°C for 30min to obtain a milky white turbid solution, pour the milky white turbid solution into the polytetrafluoroethylene cup in the autoclave, and control the filling The temperature is 70% (the volume of the polytetrafluoroethylene container is 100ml), and then the reaction kettle is put into a vacuum oven with a temperature adjusted in advance to carry out the hydrothermal reaction. Wherein, the hydrothermal reaction temperature is first raised to 80-100° C. and kept for 10-20 hours, then raise...

Embodiment 2

[0099] Add the first solvent and dispersant to the high tetragonal phase barium titanate powder obtained in Example 1, and obtain a white suspension with good dispersibility, ie a premix, by rolling. The first solvent is a mixture of absolute ethanol and methyl ethyl ketone at a volume ratio of 1:1, the dispersant is 3wt% castor oil, the tumbling speed is 250 rpm, and the tumbling time is 20 h. Wherein, the mass ratio of the high tetragonal phase barium titanate powder, the dispersant and the first solvent is 40:0.83:44.

[0100]Add a plasticizer, a binder and a second solvent to the above white suspension, and perform a second rolling mill. Among them, the plasticizer is dioctyl terephthalate (G200), the binder is polyvinyl butyral (PVB), and the second tumbling time is 12 hours, and the second solvent is absolute ethanol and butyral. The volume ratio of ketone is 1:1 mixed solution, the mass ratio of high tetragonal phase barium titanate powder, plasticizer, binder and seco...

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Abstract

The invention relates to the technical field of dielectric materials, in particular to high-tetragonal-phase barium titanate powder, a method for preparing the same, barium titanate thick-film ceramic, a method for preparing the same and application of the barium titanate thick-film ceramic. The specific surface area of the high-tetragonal-phase barium titanate powder ranges from 7.5 m<2> / g to 9.5m<2> / g; the particle size of the high-tetragonal-phase barium titanate powder ranges from 50 nm to 100 nm; the high tetragonal rate c / a of the high-tetragonal-phase barium titanate powder ranges from1.0072 to 1.0092; the tetragonal phase content of the high-tetragonal-phase barium titanate powder ranges from 65% to 80%. The high-tetragonal-phase barium titanate powder, the methods, the barium titanate thick-film ceramic and the application have the advantages that the high-tetragonal-phase barium titanate powder has the small particle size, is high in activity and can be used for preparing ultrathin thick-film ceramic; the barium titanate thick-film ceramic has a high dielectric constant, is high in breakdown field strength and is excellent in electric characteristics as compared with barium titanate thin-film ceramic, excellent electrocaloric effects can be realized by the barium titanate thick-film ceramic, and the thickness of the barium titanate thick-film ceramic can reach the micrometer scale; the barium titanate thick-film ceramic can be used as a component of an MLCC (multilayer ceramic capacitor), and accordingly the performance of the MLCC can be enhanced.

Description

technical field [0001] The invention relates to the technical field of dielectric materials, in particular to a high tetragonal phase barium titanate powder and a preparation method thereof, barium titanate thick-film ceramics, a preparation method and application thereof. Background technique [0002] Barium titanate (BaTiO 3 ) is widely used in multilayer ceramic capacitors, ferroelectric memories, sensors and electro-optical devices due to its excellent dielectric properties, piezoelectric properties and ferroelectric properties, and is called "the pillar of electronic ceramics". With the continuous shrinking of the size of electronic components, thin-film materials have become a hot spot for researchers, but the electrical properties of thin-film materials are far lower than those of bulk materials, and because the thickness of thin-film materials is as low as nanometers, it brings great benefits to the application of devices. Big inconvenience. [0003] Thick film mat...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622C01G23/00B82Y40/00
CPCB82Y40/00C01G23/006C01P2002/72C01P2004/03C01P2004/64C01P2006/12C01P2006/80C04B35/468C04B35/62218C04B2235/95
Inventor 邹艺轩鲁圣国
Owner GUANGDONG UNIV OF TECH
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