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Preparation method of giant-dielectric-constant barium titanate ceramic

A technology of giant dielectric constant and barium titanate, applied in ceramics, inorganic insulators, etc., can solve the problems of low dielectric constant, complex preparation process, and large dielectric loss, and achieve short sintering time, simple process, and dielectric strength. The effect of low power loss

Inactive Publication Date: 2013-07-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dielectric constant of the product obtained by this method is not high, and the dielectric loss is very large, the preparation process is relatively complicated, and the energy consumption is large

Method used

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  • Preparation method of giant-dielectric-constant barium titanate ceramic
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  • Preparation method of giant-dielectric-constant barium titanate ceramic

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Embodiment 1

[0032] The present embodiment provides a kind of preparation method of giant dielectric constant barium titanate ceramics, it comprises the following steps:

[0033] 1) Preparation of self-propagating system powder

[0034] ①Based on weight percentage, the system needs 109.55g of chromium trioxide powder, 38.92g of aluminum powder, 11.53g of carbon powder, and 40.00g of aluminum oxide powder to weigh the system. Powder, alumina powder and alumina grinding balls were put into the roller tank of the horizontal roller ball mill, the ratio of ball to material was 2:1, and the composite powder was obtained in the roller for 24 hours.

[0035] ②Place the composite powder in a vacuum oven at 60°C for 24 hours, pass through a 50-mesh sieve and granulate to obtain granular composite powder.

[0036] 2) Preparation of barium titanate blank

[0037] ①Under the pressure of 200MPa, barium titanate powder (particle size 2 microns, purity 99.7%) was pressed into a disc with a diameter of 1...

Embodiment 2

[0048] The present embodiment provides a kind of preparation method of giant dielectric constant barium titanate ceramics, it comprises the following steps:

[0049] 1) Preparation of self-propagating system powder

[0050] ①Based on percentage by weight, the system needs 110.35g of chromium trioxide powder, 40.15g of aluminum powder, 12.50g of carbon powder, and 37.00g of aluminum oxide powder to weigh the system. Powder, alumina powder and alumina grinding balls were put into the roller tank of the horizontal roller ball mill, the ratio of ball to material was 2:1, and the composite powder was obtained in the roller for 24 hours.

[0051] ②Place the composite powder in a vacuum oven at 60°C for 24 hours, pass through a 50-mesh sieve and granulate to obtain granular composite powder.

[0052] 2) Preparation of barium titanate blank

[0053] ①Under the pressure of 200MPa, barium titanate powder (particle size 2 microns, purity 99.7%) was pressed into a disc with a diameter o...

Embodiment 3

[0058] The present embodiment provides a kind of preparation method of giant dielectric constant barium titanate ceramics, it comprises the following steps:

[0059] 1) Preparation of self-propagating system powder

[0060] ① Calculated by weight percentage, the system needs 123.24g of chromium trioxide powder, 43.78g of aluminum powder, 12.94g of carbon powder, and 20.00g of aluminum oxide powder to weigh the system. Powder, alumina powder and alumina grinding balls were put into the roller tank of the horizontal roller ball mill, the ratio of ball to material was 2:1, and the composite powder was obtained in the roller for 24 hours.

[0061] ②Place the composite powder in a vacuum oven at 60°C for 24 hours, pass through a 50-mesh sieve and granulate to obtain granular composite powder.

[0062] 2) Preparation of barium titanate blank

[0063] ①Under the pressure of 200MPa, barium titanate powder (particle size 2 microns, purity 99.7%) was pressed into a disc with a diamete...

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Abstract

The invention relates to a preparation method of giant-dielectric-constant barium titanate ceramic, belonging to the technical field of ceramic materials. The giant-dielectric-constant barium titanate ceramic is sintered by using a self-propagating high-temperature quick pressurizing technology, wherein a self-propagating high-temperature system adopts a thermit system. The method comprises the following steps of: performing compression molding on barium titanate powder under the pressure of 200 MPa; placing into a self-propagating system; and after a self-propagating reaction is finished, applying axial pressure of 100 to 200 MPa, so that the barium titanate ceramic is compact. The barium titanate ceramic prepared by the method has the advantages of high dielectric constant, low dielectric loss and high heat stability. The self-propagating high-temperature quick pressurizing technology is low in energy consumption; the process is simple; the required materials are low in price; the sintering time is extremely short; and great value is achieved on industrial application.

Description

technical field [0001] The invention relates to a dielectric ceramic material and a preparation method thereof, in particular to a preparation method of a giant dielectric constant barium titanate ceramic, which belongs to the technical field of ceramic materials. Background technique [0002] The molecular formula of barium titanate is BaTiO 3 , which is a tetragonal phase at room temperature, is a commonly used ferroelectric material with excellent dielectric, piezoelectric, and ferroelectric properties, and is widely used in electronic devices, such as for the preparation of multiple capacitors, PTC thermistors , Piezoelectric transducers, pyroelectric detectors, etc. With the advancement of science and technology, the miniaturization and miniaturization of various equipment has put forward higher requirements for material performance, and various high dielectric and giant dielectric constant materials have been developed one after another. The dielectric constant of ba...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622H01B3/12
Inventor 张金咏徐崇君雷丽文张东明傅正义
Owner WUHAN UNIV OF TECH
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