Preparation method of wide-temperature, high-pressure-resistant and high-energy-density ceramic dielectric material

A technology of high energy storage density and ceramic medium, which is applied in the preparation of BaTiO3-based ceramic dielectric materials and energy storage medium materials, can solve the problems of unstable dielectric constant and low energy storage density, and achieve low cost, Good repeatability and the effect of improving the withstand voltage performance

Inactive Publication Date: 2014-06-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, barium titanate ceramics are often only 5-8Kv / mm, and the energy storage density is not large; at the same time, different phase transitions occur with temperature changes, resulting in unstable dielectric constants that cannot be used at special temperatures such as high and low temperatures. Barium titanate for modification

Method used

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  • Preparation method of wide-temperature, high-pressure-resistant and high-energy-density ceramic dielectric material
  • Preparation method of wide-temperature, high-pressure-resistant and high-energy-density ceramic dielectric material
  • Preparation method of wide-temperature, high-pressure-resistant and high-energy-density ceramic dielectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Wide temperature and high pressure resistant high energy storage density material: 100wt% BaTiO 3 -2wt%SiO 2

[0029] 1) 20g300nmBaTiO 3 Place the ceramic powder in solution A (a mixture of ethanol and glacial acetic acid) at pH=4, stir in a water bath at 40-80°C for 40-90 minutes, and ultrasonically disperse at 40-50°C for 40-55 minutes to obtain a suspension B;

[0030] 2) Add 1.4085g tetraethyl orthosilicate with a purity greater than 99.9% to the B suspension, and mark it as C suspension;

[0031] 3) Stir the C suspension for 30-50 minutes, so that the tetraethyl orthosilicate is evenly distributed in the ethanol and the surface of the powder, and obtain the D suspension;

[0032] 4) Stir the D suspension and add ammonia water dropwise at a rate of about 3 s / d. The metal alkoxide is hydrolyzed by adding ammonia water, and the pH is controlled at about 9 to obtain a viscous E slurry;

[0033] 5) After stirring the slurry E for 10-12 hours, wash it with deionized ...

Embodiment 2

[0039] Wide temperature and high pressure resistant high energy storage density material: 100wt% BaTiO 3 -3wt%SiO 2

[0040] 1) 20g300nmBaTiO 3 Place ceramic powder in A solution (a mixture of ethanol and glacial acetic acid) with pH=4, stir in a water bath at 40-80°C for 40-90 minutes, and ultrasonically disperse at 40-80°C for 40-90 minutes to obtain B suspension;

[0041]2) Add 2.1127g of tetraethyl orthosilicate with a purity greater than 99.9% to B suspension, and mark it as C suspension;

[0042] 3) Stir the C suspension for 50-60 minutes, so that the tetraethyl orthosilicate is evenly distributed in the ethanol and the surface of the powder, and obtain the D suspension;

[0043] 4) Stir the D suspension and add ammonia water dropwise at a rate of about 5 s / d. The metal alkoxide is hydrolyzed by adding ammonia water, and the pH is controlled at about 9 to obtain a viscous E slurry;

[0044] 5) After stirring the E slurry for 11-12 hours, wash it with deionized water ...

Embodiment 3

[0050] Wide temperature and high pressure resistant high energy storage density material: 100wt% BaTiO 3 -4wt%SiO 2

[0051] 1) 20g300nmBaTiO 3 Place ceramic powder in A solution (a mixture of ethanol and glacial acetic acid) with pH=4, stir in a water bath at 40-80°C for 60 minutes, and ultrasonically disperse at 60°C for 60 minutes to obtain B suspension;

[0052] 2) Add 2.8169g of tetraethyl orthosilicate with a purity greater than 99.9% to B suspension, and mark it as C suspension;

[0053] 3) Stir the C suspension for 60 minutes, so that the tetraethyl orthosilicate is evenly distributed in the ethanol and the surface of the powder, and obtain the D suspension;

[0054] 4) Stir the D suspension and add ammonia water dropwise at a rate of about 7 / d. The metal alkoxide is hydrolyzed by adding ammonia water, and the pH is controlled at about 9 to obtain a viscous E slurry;

[0055] 5) After stirring the slurry E for 10-14 hours, wash it with deionized water or absolute e...

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Abstract

The invention relates to a preparation method of a wide-temperature, high-pressure-resistant and high-energy-density BaTiO3 ceramic dielectric material. The preparation method comprises the following steps: (1) putting ceramic powder into a mixture solution of ethanol and glacial acetic acid, and carrying out water-bath stirring and ultrasonic dispersion, so as to obtain a turbid liquid; (2) adding metal alkoxide into the turbid liquid, stirring to uniformly distribute the metal alkoxide into the ethanol and on the surface of the ceramic powder; (3) continuously stirring, simultaneously dropwise adding ammonium hydroxide, and carrying out hydrolysis, so as to obtain thick slurry; (4) stirring and washing to obtain pulp, adding deionized water or absolute ethyl alcohol, stirring to obtain a uniformly-mixed turbid liquid, and carrying out centrifugal separation; and (5) carrying out presintering, pelleting, sieving and precipitation, pressing to obtain a ceramic green body, carrying out rubber discharging and sintering, and maintaining the temperature to obtain the ceramic dielectric material. The preparation method has the advantages that the cost is low, the preparation process is concise, the repeatability is good, the large-scale production can be realized, and the preparation of a large-size energy-storage dielectric material is facilitated; and the original grain size can be maintained, and the preparation of a nanometer energy-storage dielectric ceramic can be well assisted.

Description

technical field [0001] The invention relates to a preparation method of an energy storage medium material, especially a BaTiO with wide temperature, high pressure resistance and high energy storage density 3 A method for preparing a base ceramic dielectric material belongs to the field of dielectric energy storage materials, and the material can be used for energy storage capacitor materials, especially in the application of pulse power technology. Background technique [0002] High energy storage density, high withstand voltage ceramic capacitors are widely used in laser, radar, mobile communication and electric vehicles and other fields. Materials workers from various countries are actively exploring the preparation of dielectric materials with high dielectric constant, low dielectric loss and high compressive strength to meet the miniaturization and high energy storage density of pulse power systems. As a ferroelectric material, barium titanate has a high dielectric cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/628
Inventor 曹明贺张益鸣刘韩星尧中华郝华余志勇
Owner WUHAN UNIV OF TECH
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