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Method for preparing non-rare-earth high-magnetism permanent magnetic ferrite material

A permanent magnet ferrite, high magnetic technology, applied in the field of preparation of permanent magnet ferrite materials, can solve problems such as simultaneous attainment

Active Publication Date: 2013-04-24
宝武环科南京资源利用有限公司
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AI Technical Summary

Problems solved by technology

[0015] At present, when the permanent magnetic ferrite material is not replaced by rare earth, it cannot achieve the intrinsic coercive force Hcj≥318.3kA / m at the same time when the residual magnetic induction intensity Br≥400mT

Method used

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  • Method for preparing non-rare-earth high-magnetism permanent magnetic ferrite material

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Embodiment Construction

[0031] The following is the first embodiment of preparing non-rare earth high magnetic permanent magnet ferrite material, including the following steps:

[0032] Mixing process: After mixing the calcined materials, use a wet ball mill for 1-10 hours of mixing and crushing treatment. After the slurry is dried, the specific surface area is 1-10m 2 / g;

[0033] Among them, the calcined material includes main and auxiliary components and grinding aids, and the main component is Fe 2 o 3 and SrCO 3 , the molar ratio is 6.15; the secondary component is CaCO 3 : 0.3wt%~0.5wt%; SiO 2 :0.2wt%~0.4wt%; Al 2 o 3 : 1.0wt%~3.0wt%; additionally add grinding aid 1.0wt%;

[0034] Pre-calcination process: pre-calcine the mixture obtained in the mixing process in the air, the pre-calcination temperature is 1180 ° C, and the holding time is 3 hours, and six parts of the primary pre-calcination are obtained as comparative examples, respectively numbered A-1 and A-2 , A-3, B-1, B-2, B-3...

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Abstract

The invention provides a method for preparing a high-magnetism magnetoplumbite-structure permanent magnetic ferrite material without adopting rare-earth element substitution, and the method comprises a blending procedure, a preburning procedure, a coarse crushing procedure, a fine grinding procedure, a forming procedure and a sintering procedure. According to the method, the residual magnetic induction intensity Br and intrinsic coercivity Hcj of a permanent magnetic ferrite are enhanced by carrying out secondary calcining in the preburning procedure, so that the permanent magnetic ferrite achieves the magnetic induction intensity Br more than or equal to 400 mT and the intrinsic coercivity Hcj more than or equal to 322.3 kV / m.

Description

technical field [0001] The invention relates to a method for preparing a permanent magnet ferrite material, in particular to a method for preparing a permanent magnet ferrite material with a magnetoplumbite structure without replacing rare earth elements. [0002] Background technique [0003] Ferrite permanent magnet material is based on Fe 2 o 3 Composite oxide permanent magnet material as the main component. [0004] The permanent magnet ferrite prepared by non-rare earth substitution is also called M-type hexagonal ferrite. General M-type hexagonal ferrite can be expressed as: [0005] MO·nFe 2 o 3 [0006] In the formula, M is Ba, Sr, Pb, etc., n is a molar ratio, and the value of n satisfies 5.5≤n≤6.5. [0007] The permanent magnet ferrite with practical value is magnetoplumbite type ferrite with hexagonal symmetry. Each magnetoplumbite ferrite unit cell contains two strontium ferrite molecules. The crystal structure of strontium ferrite can be simply consid...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 匡雪冬邱士星董晓明袁小镇杨孝雄吴永路丁文澜
Owner 宝武环科南京资源利用有限公司
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