Preparation method of barium strontium titanate ceramic

A technology of barium strontium titanate and ceramics, which is applied in the field of preparation of barium strontium titanate ceramics, can solve the problems of low energy storage density, low dielectric breakdown strength, etc., achieves low sintering temperature, improves dielectric breakdown strength, cost reduction effect

Inactive Publication Date: 2014-04-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, barium strontium titanate ceramics prepared by traditional methods generally s

Method used

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  • Preparation method of barium strontium titanate ceramic
  • Preparation method of barium strontium titanate ceramic
  • Preparation method of barium strontium titanate ceramic

Examples

Experimental program
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Embodiment 1

[0035] (1) BaCO 3 , SrCO 3 and TiO 2 Raw material powder respectively according to Ba 0.3 Sr 0.7 TiO 3 Chemical formula weighing ingredients;

[0036] (2) Put the chemical raw materials prepared in step (1) into a ball mill tank, add zirconia balls and deionized water ball mill for 24 hours (particle size is 100nm~10μm), and dry the powder after ball milling in a drying oven After sieving;

[0037] (3) Calcining the powder prepared in step (2) at 1150°C for 3 hours and then sieving again;

[0038] (4) Put the powder prepared in step (3) into a graphite mold with a diameter of 10mm, put it into a spark plasma sintering system and sinter at 1000°C and 30MPa pressure for 5 minutes. The heating rate from room temperature to 900°C is 100°C / min, the heating rate from 900°C to 980°C is 40°C / min, the heating rate from 980°C to 1000°C is 20°C / min, and the temperature is kept at 1000°C for 5 minutes. After sintering, Release the pressure and cool in the furnace to obtain a ceramic...

Embodiment 2

[0048] (1) BaCO 3 , SrCO 3 and TiO 2 Raw material powder respectively according to Ba 0.4 Sr 0.6 TiO 3 Chemical formula weighing ingredients;

[0049] (2) Put the chemical raw materials prepared in step (1) into a ball mill tank, add zirconia balls and deionized water ball mill for 24 hours (particle size is 100nm~500nm), and dry the powder after ball milling in a drying oven After sieving;

[0050] (3) Calcining the powder prepared in step (2) at 1150°C for 3 hours and then sieving again;

[0051] (4) Put the powder prepared in step (3) into a graphite mold with a diameter of 10mm, put it into a spark plasma sintering system and sinter at 1000°C and 30MPa mechanical pressure for 5 minutes. The heating rate from room temperature to 900°C is 100°C / min, the heating rate from 900°C to 980°C is 40°C / min, the heating rate from 980°C to 1000°C is 20°C / min, and the temperature is kept at 1000°C for 5 minutes. After sintering, Release the pressure and cool in the furnace to ob...

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Abstract

The invention discloses a preparation method of a barium strontium titanate ceramic. The method comprises the following steps: (1) mixing raw materials of BaCO3, SrCO3, and TiO2 according to a chemical formula Ba<1-x>Sr<x>TiO3, grinding, then drying, sieving; (2) calcinating the powder obtained in the step (1) at a temperature of 1100 to 1250 for 1 to 5 hours, then sieving; (3) loading the powder obtain in the step (2) into a mould, sintering the mould at a temperature of 900 to 1050 DEG C under vacuum environment by using a spark plasma sintering system so as to obtain a ceramic sintered body; (4) performing a thermal treatment on the sintered body at a temperature of 800 to 1100 DEG C in the air for 1 to 5 hours so as to obtain the barium strontium titanate ceramic. The Ba<1-x>Sr<x>TiO3 ceramic has an energy density, which can reach 1.13 J/cm3 or more, and the energy density of the Ba<1-x>Sr<x>TiO3 ceramic is at least two times higher than that of ceramics which are prepared by the conventional sintering method.

Description

technical field [0001] The invention relates to the technical field of dielectric materials for energy storage capacitors, in particular to a preparation method of barium strontium titanate ceramics. Background technique [0002] Capacitor is a commonly used electronic and electrical component in the electronics and electric power industry. It has a wide range of uses. The dielectric energy storage capacitor is a device that stores the charge obtained from the circuit. It can smooth the fluctuation of the signal and accumulate the charge. Keeping the rest of the circuit from being destroyed, the stored charge can be distributed and used later, and even the frequency of the electrical signal can be changed. [0003] Dielectric energy storage capacitors have the advantages of fast response, regeneration, high power density, long service life, and all-solid-state safety structure, and are widely used in high-power and pulse power devices. [0004] Dielectric materials are the ...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
Inventor 吴勇军黄玉辉王楠陈湘明
Owner ZHEJIANG UNIV
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