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High-efficiency 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 breakdown strength and low attention to energy storage efficiency, achieve improved breakdown field strength, reduce waste of resources and waste of production time , Reduce the effect of the step of removing the binder

Active Publication Date: 2021-09-17
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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  • High-efficiency la-doped energy storage linear dielectric ceramic material for high temperature and preparation method thereof
  • High-efficiency la-doped energy storage linear dielectric ceramic material for high temperature and preparation method thereof
  • High-efficiency 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 a high-efficiency La-doped energy storage linear dielectric ceramic material for high temperature. The preparation method of the material is as follows: firstly, SrCO 3 , CaCO 3 、TiO 2 and La 2 o 3 As raw material, according to the chemical formula (Ca 0.5 Sr 0.5 ) 1‑1.5x La x TiO 3 Proportioned materials are taken, and the powder is mixed by wet ball milling. The dried powder is pre-calcined at 1200 °C for 2 hours, and then undergoes secondary ball milling, sieving and molding, and finally sintered at 1400 °C for 2 hours to obtain the required Linear dielectric ceramic materials. The preparation process of the ceramic material prepared by the present invention is simple, the raw material price is low, and the production cost is low. At room temperature, a linear electric hysteresis loop can be obtained, and the highest energy storage density can reach 2.07J / cm 3 , is undoped SrTiO 3 Three times the energy storage density, and the energy storage efficiency is guaranteed to be above 94% at a high temperature of 200 °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 Patents(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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