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Barium strontium titanate based aluminum oxide composite ceramic with high energy storage density and preparation method of barium strontium titanate based aluminum oxide composite ceramic

A technology with high energy storage density and barium strontium titanate, which is applied in the field of dielectric materials for energy storage capacitors, can solve the problems of reduced polarization, low energy storage density, and improved breakdown strength, so as to achieve increased energy storage density and improved dielectric strength. Effect of improving electrical breakdown strength and dielectric breakdown field strength

Active Publication Date: 2016-01-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to the existing literature reports, although the strontium barium titanate / alumina composite ceramics prepared by the traditional solid-state sintering method can improve the breakdown strength of the ceramics to a certain extent, due to the traditional solid-state sintering method, there is a gap at the phase boundary. The accumulation of defects such as bubbles and dislocations leads to a greatly reduced polarization and a small increase in breakdown strength. In addition to the defects of the traditional sintering method itself, the energy storage density is still very low

Method used

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  • Barium strontium titanate based aluminum oxide composite ceramic with high energy storage density and preparation method of barium strontium titanate based aluminum oxide composite ceramic
  • Barium strontium titanate based aluminum oxide composite ceramic with high energy storage density and preparation method of barium strontium titanate based aluminum oxide composite ceramic
  • Barium strontium titanate based aluminum oxide composite ceramic with high energy storage density and preparation method of barium strontium titanate based aluminum oxide composite ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) The raw material BaCO 3 , SrCO 3 and TiO 2 Press Ba 0.4 Sr 0.6 TiO 3 Chemical formula ingredients, grind to a particle size of 100nm-500nm, dry and sieve;

[0024] (2) After calcining the powder prepared in step (1) at 1150°C for 3 hours, sieve to obtain Ba 0.4 Sr 0.6 TiO 3 Powder;

[0025] (3) Ba obtained from step (2) 0.4 Sr 0.6 TiO 3 Powder and Al 2 o 3 The powder is batched according to the mass ratio of 100:1, dried after grinding, and sieved to obtain ceramic powder;

[0026] (4) Load the ceramic powder prepared in step (3) into a mold, and sinter in a vacuum environment at 1000° C. by using a spark plasma sintering system to obtain a ceramic sintered body;

[0027] (5) Under the air atmosphere, the ceramic sintered body prepared in step (4) was heat-treated at 1100° C. for 3 hours to obtain a high energy storage density of 98wt.% Ba 0.4 Sr 0.6 TiO 3 –1wt.%Al 2 o 3 Composite ceramics.

[0028] The principle of SPS sintering is: SPS uses DC ...

Embodiment 2

[0030] (1) The raw material BaCO 3 , SrCO 3 and TiO 2 Press Ba 0.4 Sr 0.6 TiO 3 Chemical formula ingredients, grind to a particle size of 100nm-500nm, dry and sieve;

[0031] (2) After calcining the powder prepared in step (1) at 1150°C for 3 hours, sieve to obtain Ba 0.4 Sr 0.6 TiO 3 Powder;

[0032] (3) Ba obtained from step (2) 0.4 Sr 0.6 TiO 3 Powder and Al 2 o 3 The powder is batched according to the mass ratio of 100:2, dried after grinding, and sieved to obtain ceramic powder;

[0033] (4) Load the ceramic powder prepared in step (3) into a mold, and sinter in a vacuum environment at 1000° C. by using a spark plasma sintering system to obtain a ceramic sintered body;

[0034] (5) Under the air atmosphere, the ceramic sintered body prepared in step (4) was heat-treated at 1100° C. for 3 hours to obtain a high energy storage density of 98wt.% Ba 0.4 Sr 0.6 TiO 3 –2wt.%Al 2 o 3 Composite ceramics.

Embodiment 3

[0036] (1) The raw material BaCO 3 , SrCO 3 and TiO 2 Press Ba 0.4 Sr 0.6 TiO 3 Chemical formula ingredients, grind to a particle size of 100nm-500nm, dry and sieve;

[0037] (2) After calcining the powder prepared in step (1) at 1150°C for 3 hours, sieve to obtain Ba 0.4 Sr 0.6 TiO 3 Powder;

[0038] (3) Ba obtained from step (2) 0.4 Sr 0.6 TiO 3 Powder and Al 2 o 3 The powder is batched according to the mass ratio of 100:5, dried after grinding, and sieved to obtain ceramic powder;

[0039] (4) Load the ceramic powder prepared in step (3) into a mold, and sinter in a vacuum environment at 1000° C. by using a spark plasma sintering system to obtain a ceramic sintered body;

[0040] (5) Under the air atmosphere, the ceramic sintered body prepared in step (4) was heat-treated at 1100° C. for 3 hours to obtain a high energy storage density of 98wt.% Ba 0.4 Sr 0.6 TiO 3 –5wt.%Al 2 o 3 Composite ceramics.

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Abstract

The invention discloses a preparation method of barium strontium titanate based aluminum oxide composite ceramic with high energy storage density. According to the method, firstly, raw materials, BaCO3, SrCO3 and TiO2 are prepared according to the chemical formula Ba0.4Sr0.6TiO 3, then ground, dried, sieved and calcined for 3 hours at the temperature of 1,150 DEG C, and Ba0.4Sr0.6TiO 3 powder is prepared; secondarily, the Ba0.4Sr0.6TiO 3 powder and Al2O3 powder are prepared in the mass ratio being (100-x):x, wherein x ranges from 1 to 5, the powder is ground, dried and sieved, and ceramic powder is prepared; the ceramic powder is put in a mold and sintered in a vacuum environment at the temperature of 1,000 DEG C through a discharge plasma sintering system, and a ceramic sintered body is prepared; the ceramic sintered body is subjected to thermal treatment for 3 hours at the temperature of 1,100 DEG C in the air atmosphere, and the barium strontium titanate based aluminum oxide composite ceramic with high energy storage density is prepared. The dielectric breakdown strength of the prepared composite ceramic can reach 300 kV / cm at the room temperature, and the energy storage density can reach 1.69 J / cm<3> at the room temperature. The prepared barium strontium titanate based aluminum oxide composite ceramic with high energy storage density can be used for components such as a high-density energy storage capacitor and the like and has great application value in the high-power and impulse-power fields.

Description

technical field [0001] The invention relates to the technical field of dielectric materials for energy storage capacitors, in particular to a high energy storage density multi-phase dielectric ceramic and a preparation method thereof. Background technique [0002] Dielectric capacitors have ultra-high power density and are very suitable for applications with fast and unstable power fluctuations. They also have the advantages of fast response, high power density, long cycle life, and all-solid-state safety structure. They have broad applications in the field of energy storage. Foreground, barium strontium titanate ceramics are typical dielectric materials. However, their relatively low energy storage density limits the wider application of dielectric capacitors. Exploring new dielectric materials with high dielectric constant, high dielectric breakdown field strength and low dielectric loss based on barium strontium titanate ceramics and its new preparation process has alway...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468H10N30/853
Inventor 吴勇军蒋小超陈湘明
Owner ZHEJIANG UNIV
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