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Preparation method for preparing compact small-grain BaFe12O19 ferrite ceramic by three-step sintering method

A bafe12o19, bafe19o12 technology, applied in the field of magnetoplumbite-type ferrite materials, can solve the problems of low saturation magnetization, reduced ceramics, limited density contribution, etc. The effect of world migration

Active Publication Date: 2021-04-13
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional sintering method only improves the BaFe by increasing the calcination temperature 19 o 12 Densification of ceramics, but the contribution of this approach to densification is limited
The high calcination temperature will make the grain grow very rapidly, and the many pores inside the ceramic will not be discharged in time, so the compactness will not be very high, which will further cause the saturation magnetization of the sample to be lower than the theoretical value, greatly reducing the BaFe 19 o 12 Ceramic properties

Method used

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  • Preparation method for preparing compact small-grain BaFe12O19 ferrite ceramic by three-step sintering method
  • Preparation method for preparing compact small-grain BaFe12O19 ferrite ceramic by three-step sintering method
  • Preparation method for preparing compact small-grain BaFe12O19 ferrite ceramic by three-step sintering method

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preparation example Construction

[0026] The invention discloses a three-step sintering method for preparing dense small grain BaFe 12 o 19 The preparation method of ferrite ceramics comprises the following steps:

[0027] Preparation of precursor solution: ferric nitrate (Fe(NO 3 ) 3 ) and barium nitrate (Ba(NO 3 ) 2 ) powder is dissolved in deionized water after being weighed according to the molar ratio of 12:1 to obtain a clear solution, then add citric acid with the same amount of nitrate ion in ferric nitrate and barium nitrate, fully stir, and allow citric acid to completely Dissolving to obtain a precursor solution;

[0028] Adjust the pH value: continue to stir, and slowly add ammonia water to the precursor solution until the pH value of the solution is 6-7, forming a light green transparent sol;

[0029] Gel formation: put the sol in a water bath, heat the water bath to form a wet gel, put the wet gel into an electric blast drying oven, and keep it warm for 36 hours to obtain a loose dry gel; ...

Embodiment 1

[0041] A dense small grain BaFe 19 o 12 The preparation method of ceramics comprises the following steps:

[0042] Preparation of precursor solution: ferric nitrate (Fe(NO 3 ) 3 ) and barium nitrate (Ba(NO 3 ) 2 ) powder is dissolved in deionized water after being weighed according to the molar ratio of 12:1 to obtain a clear solution, then add citric acid with the same amount of nitrate ion in ferric nitrate and barium nitrate, fully stir, and allow citric acid to completely Dissolving to obtain a precursor solution;

[0043] Adjust the pH value: continue to stir, and slowly add ammonia water to the precursor solution until the pH value of the solution is 6-7, forming a light green transparent sol;

[0044] Gel formation: put the sol in a water bath, heat the water bath to form a wet gel, put the wet gel into an electric blast drying oven, and keep it warm for 36 hours to obtain a loose dry gel;

[0045] Pre-calcination: Grind the dry gel into powder, put the powder in...

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Abstract

The invention discloses a preparation method for preparing compact small-grain BaFe12O19 ferrite ceramic by a three-step sintering method. BaFe19O12 powder formed by a sol-gel method is small in particle size and excellent in magnetic property, and the size uniformity of the used BaFe19O12 powder particles is realized by granulating and sieving. In the sintering process, the temperature is rapidly increased to a large value (T1), then the temperature is rapidly reduced to a low value (T2), heat preservation is conducted for a short time, then the temperature is continuously and rapidly reduced to a lower value (T3), heat preservation is conducted for a long time, BaFe19O12 ceramic grain boundary migration is inhibited in the process, and meanwhile BaFe19O12 ceramic grain boundary diffusion activity is kept; and the preparation of the compact small-grain BaFe19O12 ceramic is realized. The product synthesized by the method is small in grain size and high in purity; the prepared BaFe12O19 ceramic has obviously better parameters such as compactness, grain size, saturation magnetization and the like than the BaFe12O19 ceramic prepared by the traditional method, and can meet higher application requirements.

Description

technical field [0001] The invention relates to the technical field of magnetoplumbite type ferrite materials, in particular to a three-step sintering method for preparing dense small-grained BaFe 12 o 19 Preparation method of ferrite ceramics. Background technique [0002] M type barium ferrite (BaFe 19 o 12 ), as a magnetoplumbite-type ferrite, has the characteristics of strong uniaxial magnetocrystalline anisotropy, high saturation magnetization and excellent chemical stability, and is widely used in microwave devices such as circulators. With the continuous development of society, the requirements for the electronic industry are getting higher and higher. Whether it is electronic devices or materials, it is necessary to further improve the performance to meet the needs of social development. The traditional sintering method only improves the BaFe by increasing the calcination temperature 19 o 12 Density of ceramics, but this method has limited contribution to the i...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B35/624C04B35/64
CPCC04B35/2683C04B35/622C04B35/624C04B35/64C04B2235/3215C04B2235/6562C04B2235/6565C04B2235/6567
Inventor 郑辉张鸿波张阳郑梁郑鹏
Owner HANGZHOU DIANZI UNIV
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