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Composite powder body by utilizing alumina for coating barium strontium titanate and preparation method thereof

A technology of coating barium strontium titanate and composite powder, which is applied in the field of powder surface treatment and microwave dielectric ceramic materials, can solve the problems of affecting electrical properties and material grains are too large, and achieve the effect of optimizing dielectric properties

Inactive Publication Date: 2010-03-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the Ba existing in the prior art 1-x Sr x TiO 3 The grain size of the material is too large, which affects its electrical performance. The present invention proposes a composite powder of alumina-coated barium strontium titanate and its preparation method

Method used

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  • Composite powder body by utilizing alumina for coating barium strontium titanate and preparation method thereof
  • Composite powder body by utilizing alumina for coating barium strontium titanate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In this example, Ba 0.6 Sr 0.4 TiO 3 and AlCl 3 It is a precursor material, and the composition of the precursor material is (1-y) Ba 0.6 Sr 0.4 TiO 3 +yAlCl 3 , where y=25wt%. Deionized water was used as a solvent, and ammonia water was used to adjust the pH value of the solution, and PMAA-NH 4 As a dispersant, PMAA-NH 4 The average molecular weight is 5000, and Al is prepared by liquid phase coating method 2 o 3 Coated Ba 0.6 Sr 0.4 TiO 3 Composite powder, specific preparation steps are as follows:

[0017] (1) Preparation of Ba 0.6 Sr 0.4 TiO 3 Powder: Analytical pure BaCO 3 , SrCO 3 、TiO 2 As raw material, according to Ba 0.6 Sr 0.4 TiO 3 The stoichiometric ratio ingredients were ball milled in anhydrous ethanol medium for 12 hours; the powder was dried and pre-calcined at 1100°C for 3 hours to obtain pure Ba 0.6 Sr 0.4 TiO 3 Powder; powder drying temperature is 80°C;

[0018] (2) Preparation of Ba 0.6 Sr 0.4 TiO 3 Stable suspension: usi...

Embodiment 2

[0023] In this example, Ba 0.7 Sr 0.3 TiO 3 and AlCl 3 It is a precursor material, and the composition of the precursor material is (1-y) Ba 0.7 Sr 0.3 TiO 3 +yAlCl 3 , where y=40wt%. Deionized water was used as a solvent, and ammonia water was used to adjust the pH value of the solution, and PMAA-NH 4 As a dispersant, PMAA-NH 4 The average molecular weight is 5000, and Al is prepared by liquid phase coating method 2 o 3 Coated Ba 0.7 Sr 0.3 TiO 3 Composite powder, specific preparation steps are as follows:

[0024] (1) Preparation of Ba 0.7 Sr 0.3 TiO 3 Powder: Analytical pure BaCO 3 , SrCO 3 、TiO 2 As raw material, according to Ba 0.7 Sr 0.3 TiO 3 The stoichiometric ratio ingredients were ball milled in anhydrous ethanol medium for 12 hours; after the powder was dried, it was pre-calcined at 1200 °C for 6 hours to obtain pure Ba 0.7 Sr 0.3 TiO 3 Powder; powder drying temperature is 80°C;

[0025] (2) Preparation of Ba 0.7 Sr 0.3 TiO 3 Stable susp...

Embodiment 3

[0030] In this example, Ba 0.3 Sr 0.7 TiO 3 and AlCl 3 It is a precursor material, and the composition of the precursor material is (1-y) Ba 0.3 Sr 0.7 TiO 3 +yAlCl 3 , where y=50wt%. Deionized water was used as a solvent, and ammonia water was used to adjust the pH value of the solution, and PMAA-NH 4 As a dispersant, PMAA-NH 4 The average molecular weight is 5000, and Al is prepared by liquid phase coating method 2 o 3 Coated Ba 0.3 Sr 0.7 TiO 3Composite powder, specific preparation steps are as follows:

[0031] (1) Preparation of Ba 0.3 Sr 0.7 TiO 3 Powder: Analytical pure BaCO 3 , SrCO 3 、TiO 2 As raw material, according to Ba 0.3 Sr 0.7 TiO 3 The stoichiometric ratio ingredients were ball milled in anhydrous ethanol medium for 24 hours; after the powder was dried, it was pre-calcined at 1100°C for 3 hours to obtain pure Ba 0.3 Sr 0.7 TiO 3 Powder; powder drying temperature is 80°C;

[0032] (2) Preparation of Ba 0.3 Sr 0.7 TiO 3 Stable suspen...

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Abstract

The invention discloses a composite powder body by utilizing alumina for coating barium strontium titanate and a peparation method thereof. The preparation method comprises the following steps: utilizing Ba[1-x]Sr[x]TiO3 and AlCl3 as precursor materials; utilizing de-ionized water as a solvent; utilizing ammonia water for adjusting the pH value of a solution; utilizing PMAA-NH4 as a dispersant; adopting a liquid-coating method for preparing a Ba[1-x]Sr[x]TiO3 composite powder body coated by the Al2O3; and coating the Al2O3 on the surface of the Ba[1-x]Sr[x]TiO3 particles. Compared with traditional mixed method, the method can prevent the growth of the Ba[1-x]Sr[x]TiO3 particles when sintering, control the granularity of Ba[1-x]Sr[x]TiO3 crystal grains in a sintering body in a smaller range, thereby optimizing the dielectric property of the sintering body. The invention can be widely used for manufacturing electronic devices and components of phased-array antennas, microwave transmission lines, microwave phasers, adjustable capacitors, and the like.

Description

technical field [0001] The invention relates to the field of microwave dielectric ceramic materials and the technical field of powder surface treatment, in particular to a composite powder of alumina-coated barium strontium titanate and a preparation method thereof. Background technique [0002] Barium strontium titanate (Ba 1-x Sr x TiO 3 ) is strontium titanate (SrTiO 3 ) solid solution in barium titanate (BaTiO 3 ) to form a solid solution. Barium strontium titanate material has very high dielectric tunability, which can adjust the dielectric constant and Curie temperature of the material in a wide range, making it suitable for phased array antennas, ferroelectric memory materials, transmission lines and wireless communications, etc. All of them have great application potential. Since the mid-1990s, the US Armament Research Laboratory has conducted systematic research on barium strontium titanate materials. Subsequently, countries such as the United Kingdom, France...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/462C04B35/628
Inventor 高峰王通胡国辛刘亮亮李博许贝李真
Owner NORTHWESTERN POLYTECHNICAL UNIV
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