Method for preparing magnesium tantalate microwave ceramic powder by sol-gel technique

A sol-gel technology and a sol-gel method, which are applied in the field of preparing magnesium tantalate microwave ceramic powder, can solve the problems of high synthesis temperature and unfavorable microwave ceramic sintering, and achieve high powder purity, fine particles, and good sintering The effect of the characteristic

Inactive Publication Date: 2010-07-14
TIANJIN UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] According to the current research data, about MgO-Ta 2 o 5 The preparation technology of the system material system is mainly based on solid phase synthesis, Mg 4 Ta 2 o 9 The synthesis temperature of the system is too high (the synthesis temperature is above 1000°C), and the particle size of the synthesized ceramic powder is at the micron level, which is not conducive to the sintering of microwave ceramics in the later stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Prepare the citric acid aqueous solution of tantalum

[0024] (a) According to the molar ratio of tantalum pentoxide and potassium carbonate as 1:5 ingredients, respectively weigh 5.326 grams of tantalum pentoxide powder and 13.819 grams of cosolvent potassium carbonate; mix the tantalum pentoxide powder and potassium carbonate powder evenly , put it into a high-alumina crucible, and melt it at 1000 degrees for 2 hours to obtain potassium tantalate;

[0025] (b) dissolving the potassium tantalate in step (a) in 500ml deionized water, adding nitric acid, adjusting its pH value to 3 to ensure that all tantalate precipitates are generated;

[0026] (c) take by weighing 15.3712 grams of citric acid, add 500ml deionized water to form an aqueous citric acid solution; the tantalic acid precipitation of the above step (b) is centrifuged and washed, then the tantalic acid is added to the aqueous citric acid solution, and Heat it in a water bath at 80°C to completely dissolv...

Embodiment 2

[0036] (1) Prepare the citric acid aqueous solution of tantalum

[0037] (a) According to the molar ratio of tantalum pentoxide and potassium carbonate as 1:10 ingredients, respectively weigh 5.326 grams of tantalum pentoxide powder and 27.638 grams of cosolvent potassium carbonate; mix the tantalum pentoxide powder and potassium carbonate powder evenly , put it into a high-alumina crucible, and melt it at 700 degrees for 4 hours to obtain potassium tantalate;

[0038] (b) dissolving the potassium tantalate of step (a) in 500ml deionized water, adding nitric acid, adjusting its pH value to 4, ensuring that all tantalic acid precipitates are generated;

[0039] (c) Weigh 7.6854 grams of citric acid, add 500ml deionized water to form an aqueous citric acid solution; the tantalic acid precipitation of the above step (b) is centrifuged and washed, then the tantalic acid is added to the aqueous citric acid solution, and Heat it in a water bath at 45°C to completely dissolve the ta...

Embodiment 3

[0049] (1) Prepare the citric acid aqueous solution of tantalum

[0050] (a) According to the molar ratio of tantalum pentoxide and potassium carbonate as 1:8 ingredients, respectively weigh 5.326 grams of tantalum pentoxide powder and 22.1104 grams of cosolvent potassium carbonate; mix tantalum pentoxide powder and potassium carbonate powder evenly , into a high-alumina crucible, and melted at 800 degrees for 5 hours to obtain potassium tantalate;

[0051] (b) dissolving the potassium tantalate of step (a) in 500ml deionized water, adding nitric acid, adjusting its pH value to 5, ensuring that all tantalic acid precipitates are generated;

[0052] (c) take by weighing 23.0568 grams of citric acid, add 500ml deionized water to form an aqueous citric acid solution; the tantalic acid precipitation of the above step (b) is centrifuged and washed, then the tantalic acid is added to the aqueous citric acid solution, and Heat it in a water bath at 60°C to completely dissolve the ta...

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Abstract

The invention discloses a method for preparing magnesium tantalate microwave ceramic powder by a sol-gel technique, which comprises the following steps of: (1) preparing citric acid aqueous solution of tantalum, wherein the mol ratio of citric acid to tantalum ions is 2:1-6:1; (2) preparing citric acid aqueous solution of magnesium, wherein the mol ratio of the citric acid to magnesium nitrate is 5:1-10:1, and the pH value is 3 to 5; and (3) preparing solution of Mg-Ta precursor, xerogel and nano powder. The method overcomes the defects that the current solid phase method for synthesizing the magnesium tantalate microwave ceramic powder has high synthesis temperature, large particle size, impure phase and the like; and the method prepares high-purity magnesium tantalate microwave ceramic powder with the average particle size of 40 to 80 nanometers.

Description

technical field [0001] The invention relates to electronic information materials and components, in particular to a method for preparing magnesium tantalate (Mg 4 Ta 2 o 9 ) method of microwave ceramic powder. Background technique [0002] Microwave dielectric ceramics (MWDC) refer to ceramics that are used as dielectric materials in circuits in the microwave frequency band (mainly UHF and SHF bands, 300MHz to 300GHz) and perform one or more functions. Microwave dielectric ceramics are mainly used as microwave components such as resonators, filters, dielectric antennas, and dielectric waveguide circuits. It can be used in mobile communication, satellite communication and military radar. With the rapid development of science and technology, the rapid increase in the amount of communication information, and people's requirements for wireless communication, the use of microwave communication systems such as satellite communication and satellite live TV has become an inevita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/624C04B35/495C04B35/626
Inventor 李玲霞吴海涛邹强张平曹丽凤
Owner TIANJIN UNIV
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