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Strontium titanate-based dielectric ceramic with high energy storage density and preparation method thereof

A technology of high energy storage density and dielectric ceramics, which is applied in the field of strontium titanate-based dielectric ceramics and its preparation, can solve the problems of high sintering temperature and low energy storage density, achieve enhanced breakdown electric field, increase energy storage density, and improve The effect of density and strength

Inactive Publication Date: 2019-12-20
HENAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the SrTiO in the prior art 3 To solve the problem of low energy storage density and high sintering temperature of ceramics, the present invention provides a strontium titanate-based dielectric ceramic with high energy storage density and its preparation method. Raise SrTiO 3 The breakdown electric field of ceramics increases the energy storage density of ceramics. On the other hand, additives with low melting points are added to form a liquid phase during high-temperature sintering to promote the formation of SrTiO 3 Densification of ceramics at low temperature, lower sintering temperature

Method used

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  • Strontium titanate-based dielectric ceramic with high energy storage density and preparation method thereof
  • Strontium titanate-based dielectric ceramic with high energy storage density and preparation method thereof
  • Strontium titanate-based dielectric ceramic with high energy storage density and preparation method thereof

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preparation example Construction

[0035] A strontium titanate-based dielectric ceramic with high energy storage density of the present invention has the advantages of high energy storage density and low sintering temperature, and its preparation method comprises the following steps:

[0036] Step 1: First, according to the stoichiometric ratio of SrTiO 3 : Zn 2 SnO 4 =1: x% converted to SrTiO 3 Powder and Zn 2 SnO 4 The quality of the powder, weigh the SrTiO according to the calculated quality 3 Powder and Zn 2 SnO 4 Powder, the weighed powder is fully ball milled with absolute ethanol as a dispersant. The ball mill used for ball milling is made of nylon, and the medium ball inside is made of zirconia. The three diameters are 5mm, 6.5mm and The 11mm dielectric ball is configured according to the mass ratio of 3:5:2. The purity of the absolute ethanol used in ball milling is 99.7% analytically pure; the amount of absolute ethanol added is added according to the ratio of 1.2ml of absolute ethanol per gra...

Embodiment 1

[0048] A method for preparing strontium titanate-based dielectric ceramics with high energy storage density, comprising the following steps:

[0049] Step 1. Weigh 14.9121g of SrCO according to the stoichiometric ratio of 1:1 3 and 8.0687 g of TiO 2 For chemical raw materials, pour the prepared raw materials into a ball mill jar, and add 28ml of absolute ethanol. Ball milled in a ball mill for 12 hours, and then dried in a blast oven at 90°C. Grind the dried raw materials into powder. Take an appropriate amount of ground powder and place it in a mold, and press it into a green body under a pressure of 358 MPa. The green body was heated to 1100 °C at a rate of 3 °C / min, and kept for 2 hours to synthesize SrTiO 3 . When the furnace temperature was naturally cooled to room temperature, the sample was taken out and ground to obtain SrTiO 3 Powder.

[0050] Step 2. Weigh 15.1467g of SnO according to the stoichiometric ratio of 1:2 2 and 16.4424g of ZnO chemical raw material...

Embodiment 2

[0056] The difference between this embodiment and embodiment 1 is: step 3, according to the stoichiometric ratio of SrTiO 3 : Zn 2 SnO 4 =1:0.02 Weigh the SrTiO prepared in step 1 and step 2 respectively 3 Powder 22.7510g and Zn 2 SnO 4 Powder 0.62692g. The preparation and production process of all the other raw materials are the same as in Example 1. Finally get SrTiO 3 +0.02molZn 2 SnO 4 Composite ceramics.

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Abstract

The invention discloses a preparation method of strontium titanate-based dielectric ceramic with high energy storage density. The method is as follows: firstly, the mass of SrTiO3 powder and Zn2SnO4 powder is computed according to the stoichiometric ratio SrTiO3: Zn2SnO4 =1:x%, then the SrTiO3 powder and Zn2SnO4 powder are subjected to weighing, ball milling, drying and grinding to form powder, adhesive is added into the powder, grinding is carried out for one-time compression molding, and then the compressed-molded blank is crushed and screened; the screened fine powder is subjected to secondary compression molding to obtain a compact blank; the compact blank is heated to 650 DEG C, the temperature is kept for 2h, and plastic is removed, and the compact blank is cooled to room temperaturewith the furnace to obtain the plastic-removed blank; SrTiO3+xmol% Zn2SnO4 ceramic is obtained by heating the plastic-removed blank to 1200 DEG C for sintering and holding for 4h, and cooling to roomtemperature with the furnace. The molecular formula of the dielectric ceramic is SrTiO3+xmol% Zn2SnO4, 1<=x<=10. By increasing the breakdown electric field of SrTiO3 ceramics, increasing the energy storage density of the ceramics, and adding additives with low melting point, the ceramic can form a liquid phase in the high temperature sintering process, thus promoting the densification of SrTiO3 ceramics at low temperature and reducing the sintering temperature.

Description

technical field [0001] The invention relates to the field of dielectric energy storage materials, in particular to a strontium titanate-based dielectric ceramic with high energy storage density and a preparation method thereof. Background technique [0002] Renewable energy is energy from nature, such as solar energy, wind power, tidal energy, geothermal energy, etc., which are harmless or minimally harmful to the environment and are suitable for development and utilization. However, most renewable energy is intermittent, and the supply of capacity is intermittent and random, which makes the utilization of renewable energy a difficult problem. Converting renewable energy into electricity is a good solution, but it places high demands on the ability of energy storage technology to suppress the fluctuation of transmitted power. Energy storage devices should have large power density and energy density to effectively capture energy from intermittent renewable energy sources and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/622C04B35/64
CPCC04B35/47C04B35/622C04B35/64C04B2235/3284C04B2235/3293C04B2235/6562C04B2235/6567C04B2235/785C04B2235/96
Inventor 王晓飞欧阳磊胡秋波周锋子朱照飞李立本
Owner HENAN UNIV OF SCI & TECH
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