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Preparation for magnesium niobate microwave ceramic powder through sol-gel technology

A sol-gel technology and microwave ceramic technology, which is applied in the field of preparing magnesium niobate microwave ceramic powder, can solve problems such as unfavorable microwave ceramic sintering, and achieve the effects of fine particles, good sintering characteristics, and high purity of powder

Inactive Publication Date: 2015-05-13
JINAN WEIBO NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing data research shows that the current MgO-Nb 2 o 5 The preparation technology of the system material system is mainly based on solid-phase synthesis. 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

[0028] (1) Preparation of citric acid aqueous solution of niobium

[0029] (a) According to magnesium niobate (Mg 4 Nb 2 o 9 ) stoichiometric ratio of microwave ceramic powder, respectively take niobium pentoxide powder 5.326 grams, citric acid 19.2 grams, and cosolvent potassium carbonate 14.293 grams, wherein, the molar ratio of niobium pentoxide and potassium carbonate is 1: 10. Add citric acid to 500 ml of deionized water to form an aqueous solution of citric acid; mix niobium pentoxide powder and potassium carbonate powder evenly, put them in a high-alumina crucible, and calcinate at 800 degrees for 4 hours to obtain potassium niobate;

[0030] (b) dissolving the potassium niobate of step (a) in 500ml deionized water, adding nitric acid, adjusting its pH value to 4, ensuring that all niobate precipitates are generated;

[0031] (c) Centrifuge and wash the above-mentioned niobic acid precipitate, then add the niobic acid into the citric acid aqueous solution, and heat i...

Embodiment 2

[0042] (1) Preparation of citric acid aqueous solution of niobium

[0043] (a) According to magnesium niobate (Mg 4 Nb 2 o 9 ) stoichiometric ratio of microwave ceramic powder, respectively take niobium pentoxide powder 5.326 grams, citric acid 19.2 grams, and cosolvent potassium carbonate 14.293 grams, wherein, the molar ratio of niobium pentoxide and potassium carbonate is 1: 10. Add citric acid to 500 ml of deionized water to form an aqueous solution of citric acid; mix niobium pentoxide powder and potassium carbonate powder evenly, put them in a high-alumina crucible, and calcinate at 800 degrees for 4 hours to obtain potassium niobate;

[0044] (b) dissolving the potassium niobate of step (a) in 500ml deionized water, adding nitric acid, adjusting its pH value to 4, ensuring that all niobate precipitates are generated;

[0045] (c) Centrifuge and wash the above-mentioned niobic acid precipitate, then add the niobic acid into the citric acid aqueous solution, and heat i...

Embodiment 3

[0056] (1) Preparation of citric acid aqueous solution of niobium

[0057] (a) According to magnesium niobate (Mg 4 Nb 2 o 9 ) stoichiometric ratio of microwave ceramic powder, respectively take niobium pentoxide powder 5.326 grams, citric acid 19.2 grams, and cosolvent potassium carbonate 14.293 grams, wherein, the molar ratio of niobium pentoxide and potassium carbonate is 1: 10. Add citric acid to 500 ml of deionized water to form an aqueous solution of citric acid; mix niobium pentoxide powder and potassium carbonate powder evenly, put them in a high-alumina crucible, and calcinate at 800 degrees for 4 hours to obtain potassium niobate;

[0058] (b) dissolving the potassium niobate of step (a) in 500ml deionized water, adding nitric acid, adjusting its pH value to 4, ensuring that all niobate precipitates are generated;

[0059] (c) Centrifuge and wash the above-mentioned niobic acid precipitate, then add the niobic acid into the citric acid aqueous solution, and heat i...

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Abstract

The invention discloses a method for preparing magnesium niobate microwave ceramic powder through a sol-gel technology. The method comprises the following steps: (1), preparing a citric acid aqueous solution for niobium; (2), preparing a citric acid aqueous solution for magnesium; (3), obtaining a Mg-Nb precursor solution, xerogel and nano-powder. According to the invention, the defects that the magnesium niobate microwave ceramic powder synthesized through a solid phase method at present is high in temperature and large in particle size are overcome, and the magnesium niobate microwave ceramic powder, of which the average particle size is 40-80 nm, is prepared under the condition that the calcination temperature is 550-850 DEG C.

Description

technical field [0001] The invention relates to electronic information materials and components, in particular to a method for preparing magnesium niobate (Mg 4 Nb 2 o 9 ) method of microwave ceramic powder. Background technique [0002] Microwave (Microwave) refers to electromagnetic waves with a wavelength of 1m to 1mm, that is, a frequency from 300MHz to 300GHz. Microwave dielectric ceramics (MWDC) is a new trend in international research on dielectric materials in recent years, mainly to meet the development needs of microwave mobile communications. In the late 20th century, the combination of information processing technology and electronic information digitization technology pushed the communication system to an unprecedented new peak. The ultimate goal of communication is to achieve full-time information transmission and exchange, so that the high mobility of communication machines has become an inevitable trend of development. [0003] The development of the mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/624
Inventor 吴海涛
Owner JINAN WEIBO NEW MATERIAL
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