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High-voltage-withstanding barium-titanate-based composite ceramic dielectric material and preparation method thereof

A technology of composite ceramics and dielectric materials, applied in the field of dielectric ceramics, can solve problems such as limited improvement of breakdown field strength and restricted development, and achieve the effects of improving breakdown field strength, increasing coating amount, and reducing production costs

Active Publication Date: 2019-08-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

General BaTiO 3 The breakdown field strength of ceramics is often only about 5kV / mm, and the key factors affecting the energy storage density are the breakdown field strength and polarization, because BaTiO 3 It has a large polarization itself, so the low breakdown field strength has become a factor that significantly affects its dielectric properties, and also limits its further development. It can be seen that it is imperative to increase the breakdown field strength
[0003] In order to improve the BaTiO 3 There are many reports on the modification of BaTiO, but the improvement of the breakdown field strength in the current reports is still limited, so it is urgent to explore better methods to make the BaTiO 3 The material is modified to further increase the breakdown field strength

Method used

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  • High-voltage-withstanding barium-titanate-based composite ceramic dielectric material and preparation method thereof
  • High-voltage-withstanding barium-titanate-based composite ceramic dielectric material and preparation method thereof
  • High-voltage-withstanding barium-titanate-based composite ceramic dielectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of high withstand voltage BaTiO 3 Matrix composite ceramic dielectric material: 1wt% MgO@BaTiO 3 -10wt% SiO 2

[0039] 1) 14.85g3 Place ceramic powder in solution A (a mixture of 50mL ethanol and 3mL glacial acetic acid), stir in a water bath at 40°C for 40min, and disperse ultrasonically at 25°C for 40min to obtain suspension B;

[0040] 2) Put 0.76g of magnesium chloride hexahydrate with a purity greater than 99% in a mixed solution of 10mL of ethanol and 5mL of deionized water, stir and dissolve, then add it to the B suspension, and mark it as C suspension;

[0041] 3) Ammonia water was added dropwise during the stirring of the C suspension, magnesium chloride was hydrolyzed by the addition of ammonia water, and the pH was controlled at about 11 to obtain a thick D slurry;

[0042] 4) Stir the D slurry in a water bath at 40°C for 24 hours, then dry it at 100°C for 12 hours to obtain E powder;

[0043] 5) Pre-fire the E powder at 600°C for 120 minutes ...

Embodiment 2

[0049] Preparation of high withstand voltage BaTiO 3 Matrix composite ceramic dielectric material: 2wt% MgO@BaTiO 3 -10wt% SiO 2

[0050] 1) 14.7g3 Place ceramic powder in solution A (a mixture of 50mL ethanol and 3mL glacial acetic acid), stir in a water bath at 40°C for 40min, and disperse ultrasonically at 25°C for 40min to obtain suspension B;

[0051] 2) Put 1.52g of magnesium chloride hexahydrate with a purity greater than 99% in a mixed solution of 10mL of ethanol and 5mL of deionized water, stir and dissolve, then add it to the B suspension, and mark it as C suspension;

[0052] 3) Ammonia water was added dropwise during the stirring of the C suspension, magnesium chloride was hydrolyzed by the addition of ammonia water, and the pH was controlled at about 11 to obtain a thick D slurry;

[0053] 4) Stir the D slurry in a water bath at 40°C for 24 hours, then dry it at 100°C for 12 hours to obtain E powder;

[0054] 5) Pre-fire the E powder at 600°C for 120 minutes t...

Embodiment 3

[0060] Preparation of high withstand voltage BaTiO 3 Matrix composite ceramic dielectric material: 3wt%MgO@BaTiO 3 -10wt% SiO 2

[0061] 1) 14.55g3 Place ceramic powder in solution A (a mixture of 50mL ethanol and 3mL glacial acetic acid), stir in a water bath at 40°C for 40min, and disperse ultrasonically at 25°C for 40min to obtain suspension B;

[0062] 2) Put 2.28g of magnesium chloride hexahydrate with a purity greater than 99% in a mixed solution of ethanol and deionized water, stir and dissolve, then add it to the B suspension, and mark it as C suspension;

[0063] 3) Ammonia water was added dropwise during the stirring of the C suspension, magnesium chloride was hydrolyzed by the addition of ammonia water, and the pH was controlled at about 11 to obtain a thick D slurry;

[0064] 4) Stir the D slurry in a water bath at 40°C for 24 hours, then dry it at 100°C for 12 hours to obtain E powder;

[0065] 5) Pre-fire the E powder at 600°C for 120 minutes to obtain the F ...

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Abstract

The invention relates to a high-voltage-withstanding BaTiO3-based composite ceramic dielectric material and a preparation method thereof. The high-voltage-withstanding BaTiO3-based composite ceramic dielectric material comprises a ceramic material BaTiO3, a MgO coating layer and a SiO2 coating layer, wherein the MgO coating layer is arranged between the SiO2 coating layer and the ceramic materialBaTiO3. MgO coats the surface of BaTiO3 powder by means of a sol-coprecipitation method, SiO2 is added to the coated powder by means of a traditional solid phase method, and the SiO2 and MgO double-layer coated high-voltage-withstanding BaTiO3-based composite ceramic dielectric material is obtained. The BaTiO3-based dielectric material prepared by means of the method is high in voltage withstanding performance, and the direct current withstanding voltage can reach 41 kV / mm or above. In addition, the preparation process is controllable and simple, the repeatability is excellent, there are no special requirements for the granularity and particle size of the raw materials, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of dielectric ceramics, in particular to a high-voltage-resistant barium titanate (BaTiO 3 )-based composite ceramic dielectric material and a preparation method thereof. Background technique [0002] Due to the continuous development of the electronics industry and the extensive use of electronic equipment, high-voltage ceramic capacitors have always been one of the widely used electronic equipment, ranging from the voltage doubler rectifier circuit in the display to the high-voltage power supply of lasers, radars, and electron microscopes. High voltage ceramic capacitors can be seen everywhere. High dielectric constant can realize the miniaturization and light weight of electronic components; high breakdown strength can improve the use range and service life of ceramic capacitors; low dielectric loss can reduce energy consumption. The dielectric materials used in high-voltage ceramic capacitors are mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622C04B35/626C04B35/638
CPCC04B35/468C04B35/622C04B35/62605C04B35/638C04B2235/3206C04B2235/3418C04B2235/3234C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/661C04B2235/96
Inventor 曹明贺范玉婷
Owner WUHAN UNIV OF TECH
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