High-energy-storage barium titanate dielectric material and preparation method thereof

A dielectric material and barium titanate technology are applied in the field of high energy storage barium titanate-based dielectric materials and their preparation, which can solve the problems of low discharge energy storage density and the like, and achieve the effect of good capacitance temperature stability

Active Publication Date: 2019-01-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But BaTiO 3 The breakdown strength (that is, the maximum electric field strength) of dielectric ceramics is only 50-80kV / cm, and the discharge energy storage density is not large (about 0.3J / cm 3 ), in addition, there are multiple phase transitions at different temperatures, and the dielectric constant varies greatly with temperature

Method used

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  • High-energy-storage barium titanate dielectric material and preparation method thereof
  • High-energy-storage barium titanate dielectric material and preparation method thereof
  • High-energy-storage barium titanate dielectric material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A high-energy storage barium titanate-based dielectric material whose chemical composition is expressed as 0.98BaTiO 3 -0.02Bi(Mg 1 / 2 Zr 1 / 2 )O 3 , its preparation method specifically comprises the following steps:

[0032] (1) Weigh 0.98mol BaCO according to the composition expression 3 , 0.98mol TiO 2 , 0.01mol Bi 2 o 3 , 0.01molMgO and 0.01mol ZrO 2 as a raw material;

[0033] (2) Put the raw materials into a ball mill jar, use zirconia balls and absolute ethanol as the medium, and mill them on a planetary ball mill for 8 hours; then dry them at 100°C for 24 hours and pre-fire them. Raise the temperature to 1000°C at a heating rate of 3°C / min, keep it warm for 4 hours, and cool naturally with the furnace; planetary ball mill the pre-fired powder for 4 hours, and then dry it at 100°C for 24 hours to obtain ceramic powder;

[0034](3) Add a polyvinyl alcohol aqueous solution with a concentration of 5wt.% to the ceramic powder, the addition of the polyvinyl a...

Embodiment 2

[0041] A high-energy storage barium titanate-based dielectric material, the chemical composition expression of which is 0.96BaTiO 3 -0.04Bi(Mg 1 / 2 Zr 1 / 2 )O 3 , its preparation method comprises the following steps:

[0042] (1) Weigh 0.96mol BaCO according to the chemical formula 3 , 0.96mol TiO 2 , 0.02mol Bi 2 o 3 , 0.02mol MgO and 0.02mol ZrO 2 as a raw material;

[0043] (2) Put the raw materials into a ball mill jar, use zirconia balls and absolute ethanol as the medium, and mill them on a planetary ball mill for 8 hours; then dry them at 100°C for 24 hours and pre-fire them. The heating rate of ℃ / min was raised to 970 ℃, kept for 4 hours, and cooled naturally with the furnace; the pre-fired powder was planetary ball milled for 4 hours, and then dried at 100 ℃ for 24 hours to obtain ceramic powder;

[0044] (3) Add polyvinyl alcohol aqueous solution to the ceramic powder, its concentration is 5wt.%, the addition is 3% of ceramic powder mass, mix and granulate, ...

Embodiment 3

[0051] A high-energy storage barium titanate-based dielectric material, the chemical composition expression of which is 0.92BaTiO 3 -0.08Bi(Mg 1 / 2 Zr 1 / 2 )O 3 , its preparation method comprises the following steps:

[0052] (1) Weigh 0.92mol BaCO according to the chemical formula 3 , 0.92mol TiO 2 , 0.02mol Bi 2 o 3 , 0.02mol MgO and 0.02mol ZrO 2 as a raw material;

[0053] (2) Put the raw materials into a ball mill jar, use zirconia balls and absolute ethanol as the medium, and mill them on a planetary ball mill for 8 hours; then dry them at 100°C for 24 hours and pre-fire them. The heating rate of ℃ / min is raised to 940 ℃, kept for 4 hours, and cooled naturally with the furnace; the pre-fired powder is planetary ball milled for 4 hours, and then dried at 100 ℃ for 24 hours to obtain ceramic powder;

[0054] (3) Add polyvinyl alcohol aqueous solution to the ceramic powder, its concentration is 5wt.%, the addition is 3% of ceramic powder mass, mix and granulate, cr...

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Abstract

The invention relates to a high-energy-storage barium titanate dielectric material and a preparation method thereof. The high-energy-storage barium titanate dielectric material has a chemical formulaof (1-x)BaTiO3-xBi(Mg1/2Zr1/2)O3, wherein x=0.02-0.20. The preparation method includes the steps of (1) preparing BaCO3, TiO2, Bi2O3, MgO and ZrO2 according to chemical formula doses; (2) milling thematerials by wet ball milling, mixing well, drying the mixture, pre-sintering the mixture in a muffle furnace to obtain ceramic powder; (3) ball-milling the pre-sintered powder, drying, granulating, and pressing to obtain raw ceramic; (4) debinding the raw ceramic, and sintering to obtain a ceramic sample. The preparation method is simple, low in cost, and free of lead or pollution; the prepared material herein has high discharge storage intensity of 0.31-1.45 J/cm<3> and high breakdown strength of 82-191 kV/cm.

Description

technical field [0001] The invention relates to the technical field of ceramic materials applied to electronic components, in particular to a barium titanate-based dielectric material with high energy storage and a preparation method thereof. Background technique [0002] As the main passive device of electronic circuits, capacitors can store electrostatic energy and have the characteristics of charging, discharging, communicating AC, and blocking DC. Capacitors with high energy storage density can be used to improve power quality in high-voltage capacitive energy storage systems, such as active filtering, energy storage buffering, voltage smoothing, conventional energy storage, etc. At the same time, capacitor technology can well meet the requirements of electric energy storage, discharge, filtering and power regulation in the range of microseconds to milliseconds due to its flexibility and adaptability. In recent years, with the rapid development of the electronics indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475
CPCC04B35/475C04B2235/3206C04B2235/3248C04B2235/3298
Inventor 郝华蒋雪雯刘韩星吕佳浩谢娟曹明贺尧中华
Owner WUHAN UNIV OF TECH
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