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Preparation method for barium strontium titanate (BST) thick film material

A technology of strontium barium titanate and thick film, which is applied in the field of preparation of thick film materials, can solve the problems of poor electrical properties, achieve high density, uniform particle size, and improve electrical properties

Inactive Publication Date: 2010-08-18
海安远东新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the disadvantages of the poor electrical performance of the barium strontium titanate thick film material with a substrate prepared by the prior art method, the present invention provides a method for preparing a barium strontium titanate thick film material. Barium strontium titanate thick film material can improve the electrical properties of barium strontium titanate thick film material

Method used

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  • Preparation method for barium strontium titanate (BST) thick film material
  • Preparation method for barium strontium titanate (BST) thick film material
  • Preparation method for barium strontium titanate (BST) thick film material

Examples

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Embodiment 1

[0017] Example 1, 1 mol of strontium hydroxide was added to 300 ml of glacial acetic acid, heated and dissolved in a water bath at 80° C. with stirring. After the solution turns into a clear solution, add 1.5 mol of barium acetate. Then add 600ml ethylene glycol methyl ether solution as a solvent, and stir for 10min. Weigh 7.5 mol of tetra-n-butyl titanate and add it dropwise into the solution. After stirring for 30 min, slowly add 150 ml of acetylacetone. Then heated and stirred for 3h. Finally, add 50ml of deionized water, stir and heat to obtain BST gel. The obtained BST gel was dried at 120°C, ground and sieved, and then heat-treated at 800°C for 3 hours at a heating rate of 1°C / min to synthesize a pure-phase BST nanopowder. Weigh 60 g of the obtained barium strontium titanate powder, add 10 g of ethanol as a solvent, 20 g of xylene and 1 g of glyceryl trioleate as a dispersant, and then ball mill and mix the slurry after ball milling for 24 hours, then add 2.35 g of it...

Embodiment 2

[0018] Example 2, 1 mol of strontium hydroxide was added to 300 ml of glacial acetic acid, heated and dissolved in a 75° C. water bath with stirring. After the solution turns into a clear solution, add 1.5 mol of barium acetate. Then add 600ml ethylene glycol methyl ether solution as a solvent, and stir for 5min. Weigh 7.5 mol of tetra-n-butyl titanate and add it dropwise into the solution. After stirring for 20 min, slowly add 150 ml of acetylacetone. Then heated and stirred for 1 h. Finally, add 50ml of deionized water, stir and heat to obtain BST gel. The obtained BST gel was dried at 100°C, ground and sieved, and then heat-treated at 750°C for 2 hours at a heating rate of 2°C / min to synthesize a pure-phase BST nanopowder. Weigh 60 g of the obtained barium strontium titanate powder, add 10 g of ethanol as a solvent, 20 g of xylene and 1 g of glyceryl trioleate as a dispersant, then ball mill and mix the slurry after 20 h of ball milling, and then add 2.35 g of it as a vi...

Embodiment 3

[0019] Example 3, 1 mol of strontium hydroxide was added to 300 ml of glacial acetic acid, heated and dissolved in a water bath at 85° C. while stirring. After the solution turns into a clear solution, add 1.5 mol of barium acetate. Then add 600ml ethylene glycol methyl ether solution as a solvent, and stir for 8min. Weigh 7.5 mol of tetra-n-butyl titanate and add it dropwise into the solution, and after stirring for 25 min, slowly add 150 ml of acetylacetone. Then heated and stirred for 2h. Finally, add 50ml of deionized water, stir and heat to obtain BST gel. The obtained BST gel was dried at 110°C, ground and sieved, and then heat-treated at 850°C for 4 hours at a heating rate of 3°C / min to synthesize a pure-phase BST nanopowder. Weigh 60 g of the obtained barium strontium titanate powder, add 10 g of ethanol as a solvent, 20 g of xylene and 1 g of triolein as a dispersant, and then ball mill and mix the slurry after ball milling for 26 hours, then add 2.35 g of it as a ...

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Abstract

The invention discloses a preparation method for a barium strontium titanate thick (BST) film material, which is used for solving the technical problem that the barium strontium titanate (BST) thick film material with a substrate prepared by a conventional preparation method has poor electrical property. The technical scheme comprises the following steps: preparing a BST colloid from barium acetate, strontium hydroxide, tetrabutyl titanate, glacial acetic acid, ethylene glycol monomethyl ether and acetylacetone; and tape-casting the BST colloid and then sintering the colloid at the high temperature so as to obtain the barium strontium titanate thick film material. Because the barium strontium titanate thick film material with substrate is prepared by the tape-casting method, the dielectric loss of the barium strontium titanate thick film material is reduced from about 0.02 to below 0.02 so as to improve the electrical property of the barium strontium titanate thick film material; and the barium strontium titanate thick film material has high compactness and uniform granularity.

Description

technical field [0001] The invention relates to a method for preparing a thick film material, in particular to a method for preparing a barium strontium titanate (hereinafter referred to as BST) thick film material. Background technique [0002] Ferroelectric thick film material is a new type of tuning material which is cheap, can work in the radio frequency band, and has a certain ability to resist adverse electromagnetic environments, and is used to prepare military phase shifters. Its advantages are: on the one hand, the thickness of thick film materials has been greatly reduced compared with bulk materials, and the required driving voltage is also greatly reduced, which can be used in microwave circuit design; on the other hand, thick film materials have lower surface stress than thin film materials, The dielectric properties and anti-aging ability of the material are guaranteed, which improves the survivability of the phase shifter in adverse electromagnetic environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622H10N30/853
Inventor 樊慧庆符云飞
Owner 海安远东新材料有限公司
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