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Preparation of complex phase nanocrystalline permanent ferrite material

A permanent magnet ferrite and nanocrystalline technology, applied in the field of magnetic materials, can solve the problems of long preparation time and complicated process, and achieve the effects of good dispersion, simple process and excellent comprehensive permanent magnetic properties

Inactive Publication Date: 2009-07-15
HAINING ANTEX ELECTRONICS CORP
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Problems solved by technology

[0003] At present, there is a patent for the preparation of barium ferrite material powder: the preparation method of M-type barium ferrite magnetic powder (patent number ZL200510028207.0) using sugar hydrolyzate as complexing agent and extracting with low-carbon alcohol to remove solvent , mix the metal salt solution with the sugar solution, then add the salt solution of the metal ion to be doped as required, heat to evaporate the water, and form a barium iron oxide hydrate through liquid phase reaction, and cool the reacted solution , adjust the pH value, and extract to remove water. The disadvantage of this method is that it needs vacuum filtration to obtain magnetic ferrite powder, and the preparation time is long and the process is complicated.

Method used

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Embodiment

[0021] (1) Nanocrystalline aluminum-doped barium ferrite (BaAl 0.5 Fe 11.5 o 19 ) Preparation of hard magnetic powder

[0022] Al-doped barium ferrite BaAl 0.5 Fe 11.5 o 19 Weigh iron nitrate Fe(NO 3 ) 3 9H 2 O, barium nitrate Ba(NO 3 ) 2 and aluminum nitrate Al(NO 3 ) 3 9H 2 O, and weigh the amount of citric acid that is 1 times the molar number of metal ions, and use citric acid C 6 h 8 o 7 ·H 2 O as a complexing agent, dissolved together in deionized water, with C 6 h 8 o 7 ·H 2 O to decomplex Fe 3+ with Ba 2+ , Place the solution in a constant temperature bath at 80°C, and stir it constantly to fully dissolve it. It takes about 2 hours to fully dissolve the nitrate. When the solution becomes transparent and uniform brownish red, add ethylenediamine C gradually 2 h 8 N 2 Stir at the same time until the pH of the solution is 7; pour the resulting solution into a crucible, and heat it with a resistance furnace in the air, stirring continuously until a...

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Abstract

The invention relates to a preparation method for a nano-crystalline permanent magnet oxysome material, which is characterized in that nano-crystalline hard magnetism powder and nano-crystalline soft magnetism powder are mixed, dried and annealed to obtain a complex-phase nano-crystalline permanent magnet oxysome material of excellent integrated performance. The magnetizing strength sigma s, the remanence ratio sigma r and the intrinsic coercive force Hc of the complex-phase nano-crystalline permanent magnet oxysome material are respectively higher than 50 emu / g, 0.5 and 5800Oe. The complex-phase nano-crystalline permanent magnet oxysome material can be used as a similar traditional permanent magnet oxysome material, a high-density information magnetic record medium, a magnetic optical device, a microwave absorbing material and the like. The method of the invention has the advantages of low sintering temperature, simple technology and the like.

Description

technical field [0001] The invention relates to a preparation method of a nanocrystalline permanent magnet ferrite material, which belongs to the technical field of magnetic materials. Background technique [0002] With the continuous development of science and technology, the requirements for material performance, preparation process, material cost, etc. are getting higher and higher. In order to meet new market demands, it is necessary to modify the traditional barium ferrite. Composite nanocrystalline permanent magnetic ferrite is composed of nanocrystalline hard magnetic ferrite phase and nanocrystalline soft magnetic ferrite phase, and is a composite permanent magnetic material with strong exchange coupling between the hard magnetic phase and the soft magnetic phase. Due to the complexity of composition and microstructure, compared with traditional permanent magnet ferrite materials, multiphase nanocrystalline permanent magnet ferrite materials have completely new char...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 张凤翔马洪良冯利荣钟敏建张义邴
Owner HAINING ANTEX ELECTRONICS CORP