Efficient La-doped energy-storage linear dielectric ceramic material for high temperature and preparation method thereof

A dielectric ceramic and high-efficiency technology, applied in the field of linear dielectric ceramic materials, can solve the problems of low energy storage efficiency and low breakdown strength, reduce waste of resources and production time, and improve breakdown field strength , Reduce the effect of the step of removing the binder

Active Publication Date: 2019-06-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the ceramic dielectric material has a high dielectric constant, but the breakdown strength is generally low, and in a single material, it is generally difficult to obtain high dielectric constant and high breakdown strength at the same time
And for a long time, among the energy storage performance parameters that material researchers pay attention to, the energy storage density bears the brunt, while the energy storage efficiency is less concerned.

Method used

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  • Efficient La-doped energy-storage linear dielectric ceramic material for high temperature and preparation method thereof
  • Efficient La-doped energy-storage linear dielectric ceramic material for high temperature and preparation method thereof
  • Efficient La-doped energy-storage linear dielectric ceramic material for high temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The chemical formula of this linear dielectric ceramic material is: (Ca 0.5 Sr 0.5 ) 1-1.5x La x TiO 3 , wherein x represents a mole percentage, and x=0.000.

[0033] The aforementioned La doped with Ca 0.5 Sr 0.5 TiO 3 A preparation method for a linear dielectric ceramic material, comprising the following steps:

[0034] (1) According to the chemical formula (Ca 0.5 Sr 0.5 ) 1-1.5x La x TiO 3 (x=0.000) will analyze pure SrCO 3 , CaCO 3 、TiO 2 After preparation, it is uniformly mixed by ball milling, then dried, sieved, and then pre-calcined to obtain a block solid;

[0035] (2) After crushing the massive solid, ball milling is carried out again, and the product is sieved to obtain Ca 0.5 Sr 0.5 TiO 3 Powder;

[0036] (3) Ca will be obtained 0.5 Sr 0.5 TiO 3 For the powder, weigh 0.4-0.45g per portion, then pour it into the mold, apply a force of 600N, and demould the formed disc to obtain a sample with a good shape;

[0037] (4) Place the wafer i...

Embodiment 2

[0044] The chemical formula of this linear dielectric ceramic material is: (Ca 0.5 Sr 0.5 ) 1-1.5x La x TiO 3 , wherein x represents the mole percentage, and x=0.050.

[0045] The aforementioned La doped with Ca 0.5 Sr 0.5 TiO 3 A preparation method for a linear dielectric ceramic material, comprising the following steps:

[0046] (1) According to the chemical formula (Ca 0.5 Sr 0.5 ) 1-1.5x La x TiO 3 (x=0.050) will analyze pure SrCO 3 , CaCO 3 、TiO 2 , La 2 o 3 After preparation, it is uniformly mixed by ball milling, then dried, sieved, and then pre-calcined to obtain a block solid;

[0047] (2) After the blocky solid is pulverized, ball milling is carried out again, and the product is sieved to obtain (Ca 0.5 Sr 0.5 ) 0.925 La 0.050 TiO 3 Powder;

[0048] (3) will get (Ca 0.5 Sr 0.5 ) 0.925 La 0.050 TiO 3 For the powder, weigh 0.4-0.45g per portion, then pour it into the mold, apply a force of 600N, and demould the formed disc to obtain a sample...

Embodiment 3

[0055] The chemical formula of this linear dielectric ceramic material is: (Ca 0.5 Sr 0.5 ) 1-1.5x La x TiO 3 , wherein x represents the mole percentage, and x=0.075.

[0056] The aforementioned La doped with Ca 0.5 Sr 0.5 TiO 3 A preparation method for a linear dielectric ceramic material, comprising the following steps:

[0057] (1) According to the chemical formula (Ca 0.5 Sr 0.5 ) 1-1.5x La x TiO 3 (x=0.075) will analyze pure SrCO 3 , CaCO 3 、TiO 2 , La 2 o 3 After preparation, it is uniformly mixed by ball milling, then dried, sieved, and then pre-calcined to obtain a block solid;

[0058] (2) After the blocky solid is pulverized, ball milling is carried out again, and the product is sieved to obtain (Ca 0.5 Sr 0.5 ) 0.8875 La 0.075 TiO 3 Powder;

[0059](3) will get (Ca 0.5 Sr 0.5 ) 0.8875 La 0.075 TiO 3 For the powder, weigh 0.4-0.45g per portion, then pour it into the mold, apply a force of 600N, and demould the formed disc to obtain a sampl...

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Abstract

The invention discloses an efficient La-doped energy-storage linear dielectric ceramic material for a high temperature. A preparation method of the material comprises the following steps: firstly, taking SrCO3, CaCO3, TiO2 and La2O3 as raw materials, and proportioning and selecting the raw materials according to a chemical formula (Ca0.5Sr0.5)1-1.5xLaxTiO3; mixing the powder by wet ball-milling; pre-sintering the dried powder at a temperature of 1200 DEG C for 2 hours; performing secondary ball-milling, screening and molding; finally sintering at a temperature of 1400 DEG C for 2 hours to obtain the required linear dielectric ceramic material. The prepared ceramic material disclosed by the invention has the advantages of simple preparation process, low raw material price, and low production cost; a linear ferroelectric hysteresis loop can be obtained at room temperature, the energy storage density can be up to 2.07 J/cm<3>, which is 3 times that of non-doped SrTiO3, and the energy storage efficiency can be 94 percent or above at a high temperature of 200 DEG C.

Description

technical field [0001] The invention belongs to the technical field of linear dielectric ceramic materials, and relates to a rare earth ion La 3+ Ca doped by charge balance 0.5 Sr 0.5 TiO 3 Linear dielectric ceramic material with high energy storage efficiency and preparation method thereof. Background technique [0002] With the rapid development of pulse power technology in the fields of hybrid electric vehicles, aerospace and oil drilling, the requirements of "high temperature, high energy density and high reliability" have been put forward for energy storage dielectric capacitors. However, the performance of energy storage dielectric capacitors mainly depends on the energy storage dielectric materials used. With the development of miniaturization of pulsed power sources, the development of solid-state energy storage dielectric materials has been paid more and more attention. Among them, the ceramic dielectric material has a high dielectric constant, but the breakdow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/622C04B41/88
Inventor 蒲永平王雯欧阳涛郭旭史瑞科李经纬杨梦蝶师裕
Owner SHAANXI UNIV OF SCI & TECH
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