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0.5NBT-0.5BCTZ-xwt%MgO high-storage-energy-density ceramic material prepared by microwave sintering and method

A 0.5nbt-0.5bctz-xwt%mgo, high energy storage density technology, applied in the field of electronic ceramics, can solve problems such as influence, and achieve the effects of optimizing microstructure, refining grains, and high energy storage density

Inactive Publication Date: 2017-02-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have found that the breakdown strength of MgO is as high as 1000kV / cm, adding it to ceramics can effectively improve the breakdown strength of the matrix material, but MgO can react with the matrix material, thereby affecting other properties, such as polarization strength

Method used

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  • 0.5NBT-0.5BCTZ-xwt%MgO high-storage-energy-density ceramic material prepared by microwave sintering and method
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  • 0.5NBT-0.5BCTZ-xwt%MgO high-storage-energy-density ceramic material prepared by microwave sintering and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing 0.5NBT-0.5BCTZ-xwt%MgO high energy storage density ceramic material by microwave sintering, according to the chemical formula Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 o 3 (BCTZ), mix barium carbonate, calcium carbonate, titanium dioxide and zirconia evenly and then keep warm at 1270°C for 2 hours to synthesize BCTZ ceramic powder, according to the chemical formula Na 0.5 Bi 0.5 TiO 3 (NBT), sodium carbonate, bismuth oxide and titanium dioxide were mixed uniformly and then kept at 840°C for 4h to synthesize NBT ceramic powder. Mix BCTZ ceramic powder, NBT ceramic powder and MgO according to the chemical formula 0.5NBT-0.5BCTZ-3wt% MgO, use deionized water as the ball milling medium and ball mill for 6 hours to mix evenly, then dry at 80°C, granulate and shape Finally, it is sintered into porcelain by microwave sintering at 1000°C for 5 minutes.

Embodiment 2

[0035] A method for preparing 0.5NBT-0.5BCTZ-xwt%MgO high energy storage density ceramic material by microwave sintering, according to the chemical formula Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 o 3 (BCTZ), mix barium carbonate, calcium carbonate, titanium dioxide and zirconia evenly, and then keep warm at 1250°C for 3 hours to synthesize BCTZ ceramic powder, according to the chemical formula Na 0.5 Bi 0.5 TiO 3 (NBT), sodium carbonate, bismuth oxide and titanium dioxide were mixed uniformly and then kept at 850°C for 5h to synthesize NBT ceramic powder. Mix BCTZ ceramic powder, NBT ceramic powder and MgO according to the chemical formula 0.5NBT-0.5BCTZ-3.5wt% MgO, use deionized water as the ball milling medium and ball mill for 7 hours to mix evenly, then dry at 85°C, granulate, After molding, it is sintered into porcelain by microwave sintering at 900°C for 7 minutes.

Embodiment 3

[0037] A method for preparing 0.5NBT-0.5BCTZ-xwt%MgO high energy storage density ceramic material by microwave sintering, according to the chemical formula Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 o 3 (BCTZ), mix barium carbonate, calcium carbonate, titanium dioxide and zirconia evenly and then keep warm at 1260°C for 4h to synthesize BCTZ ceramic powder, according to the chemical formula Na 0.5 Bi 0.5 TiO 3 (NBT), sodium carbonate, bismuth oxide and titanium dioxide were mixed uniformly and then kept at 830°C for 5.5h to synthesize NBT ceramic powder. Mix BCTZ ceramic powder, NBT ceramic powder and MgO according to the chemical formula 0.5NBT-0.5BCTZ-4wt% MgO, use deionized water as the ball milling medium and ball mill for 8 hours to mix evenly, then dry at 90°C, granulate and shape Finally, it is sintered into porcelain by microwave sintering at 950°C for 10 minutes.

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Abstract

The invention relates to a 0.5NBT-0.5BCTZ-xwt%MgO high-storage-energy-density ceramic material prepared by microwave sintering and a method. The method comprises the following steps: firstly, proportioning BCTZ ceramic powder, NBT ceramic powder and magnesium oxide powder according to a stoichiometric ratio of a chemical formula 0.5NBT-0.5BCTZ-xwt%MgO, uniformly mixing, pelletizing and forming; and sintering and forming ceramics by preserving heat for 4 to 20 minutes at a temperature ranging from 900 DEG C to 1100 DEG C in a microwave sintering mode, thereby obtaining the high-storage-energy-density ceramic material, wherein x ranges from 3 to 7. Through microwave sintering, the method has the advantages of high heating speed, uniform heating and the like; reaction of MgO and a matrix material can be effectively restrained at a relatively low sintering temperature within relatively short sintering time, and the microstructure of the material can be optimized to improve the compactness of the material, so that breakdown strength of the material is effectively improved, and the high-storage-energy-density ceramic material is prepared.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of electronic ceramics, and in particular relates to a microwave sintering preparation 0.5NBT-0.5BCTZ-xwt% MgO high energy storage density ceramic material and a method. [0003] 【Background technique】 [0004] With the development of pulse power technology, higher requirements are placed on the energy storage density of energy storage components in pulse power devices. Compared with other energy storage devices, capacitors have the advantages of large discharge power, high utilization efficiency, and large space for increasing energy storage density. They are gradually becoming energy storage components in pulse power equipment and are widely used in electromagnetic railgun weapons, all-electric Defense and modern industrial fields such as warships, combat vehicles and hybrid vehicles. However, there are many unfavorable factors in the existing pulse capacitors, such as low energy storage density, easy explo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/475C04B35/622C04B35/64
CPCC04B35/49C04B35/475C04B35/622C04B35/64C04B2235/3201C04B2235/3206C04B2235/3208C04B2235/3215C04B2235/3232C04B2235/3244C04B2235/3298C04B2235/656C04B2235/667
Inventor 蒲永平姚谋腾高淑雅
Owner SHAANXI UNIV OF SCI & TECH
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