Method for preparing magnesium niobate microwave ceramic powder on the basis of sol-gel technique

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

Inactive Publication Date: 2009-09-16
TIANJIN UNIV
View PDF0 Cites 14 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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 ) The stoichiometric ratio of the microwave ceramic powder, respectively taking by weighing 5.326 grams of niobium pentoxide powder, 19.2 grams of citric acid, and 14.293 grams of cosolvent potassium carbonate, 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 aci...

Embodiment 2

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

[0043] (a) According to magnesium niobate (Mg 4 Nb 2 o 9 ) The stoichiometric ratio of the microwave ceramic powder, respectively taking by weighing 5.326 grams of niobium pentoxide powder, 19.2 grams of citric acid, and 14.293 grams of cosolvent potassium carbonate, 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 aci...

Embodiment 3

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

[0057] (a) According to magnesium niobate (Mg 4 Nb 2 o 9 ) The stoichiometric ratio of the microwave ceramic powder, respectively taking by weighing 5.326 grams of niobium pentoxide powder, 19.2 grams of citric acid, and 14.293 grams of cosolvent potassium carbonate, 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 aci...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing magnesium niobate microwave ceramic powder on the basis of sol-gel technique. The method comprises the following steps: (1) preparing the citric acid solution of niobium (Nb); (2) preparing the citric acid solution of magnesium (Mg); and (3) obtaining a Mg-Nb precursor solution, xerogel and nano-powder. The invention can overcome the disadvantages of high temperature and large particle size in the existing synthesis of magnesium niobate microwave ceramic powder on the basis of solid-phase method by preparing the magnesium niobate microwave ceramic powder with the average particle diameter being 40nm to 80nm under the condition that the calcination temperature is 550 to 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/624C04B35/495C04B35/626
Inventor 李玲霞吴海涛张平曹丽凤
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap