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Method for preparing permanent magnet oxysome material

A permanent magnet ferrite and slurry technology, which is applied in the preparation of permanent magnet ferrite molding slurry and the preparation of high-performance permanent magnet ferrite materials, can solve problems such as difficult orientation, and achieve the effect of high comprehensive magnetic properties

Active Publication Date: 2011-05-11
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slurry particle size is not as fine as possible. Relevant studies have shown that ultrafine M-type ferrite particles with a particle size below 0.1 μm have a superparamagnetic effect. Due to this effect, 0.1 μm ferrite particles in the slurry Particles will be difficult to orient under the action of a magnetic field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The batching process selects various raw material requirements and corresponding weight percentages as follows:

[0037] (1) Iron red: the purity of Fe 2 o 3 Content≥99.5wt%, Cl - The original average particle size of particles with ion content ≤ 0.1wt% is 1.6μm, and the weight percentage is 84.4%;

[0038] (2) Strontium carbonate: where the purity of SrCO 3 ≥98.0wt%, the original average particle size of the particles is 2.1μm, and the weight percentage is 4.52%;

[0039] (3) Calcium carbonate: its purity CaCO 3 ≥99.0wt%, the original average particle size of the particles is 4.2μm, and the weight percentage is 1.52%;

[0040] (4) Lanthanum oxide: where the purity La 2 o 3 ≥99.0wt%, the original average particle size of the particles is 4.5μm, and the weight percentage is 6.86%;

[0041] (5) Cobalt trioxide: the purity of Co 2 o 3 ≥99.0wt%, the original average particle size of the particles is 2.5μm, and the weight percentage is 2.68%.

[0042] Weigh the ab...

Embodiment 2

[0059] Two groups of different formula tests are numbered as embodiment 2A and embodiment 2B respectively. The raw material selection and batching process are as in Example 1. After mixing, pre-calcination and other processes, the main phase components of the two groups of test pre-calcination powders are respectively Sr 0.48 Ca 0.16 La 0.36 Fe 11.05 co 0.27 o 19 and Sr 0.31 Ca 0.25 La 0.44 Fe 10.56 co 0.39 o 19 .

[0060] Weigh the above two groups of formula test calcined materials, add secondary additives based on the weight of calcined materials: 0.6wt% SiO 2 , 0.8wt% CaCO 3 , 0.4wt% Cr 2 o 3 , 0.1wt% ZnO, 0.05wt% Al 2 o 3 , 0.2wt% H 3 BO 3 and 0.1wt% SrCO 3 , the average particle size of the secondary additives does not exceed 5μm, after 24h wet ball milling, the average particle size of the slurry is 0.57μmm and 0.59μm, Fe 2+ The wt% was 4.9% and 4.6%, respectively. Then, the above slurry was treated with 6 different back-burning and grinding proce...

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Abstract

The invention belongs to the permanent-magnet material field and provides a method for preparing permanent magnet oxysome material, which mainly comprises a novel technique adopted in wet ball-milling stage, that is, being receiving wet ball-milling to reach a certain granularity, a pre-sintering material firstly receives low-temperature resintering, and then receives wet remilling for a short time, so as to prepare needed slurry for facilitating sintering after forming. Through adopting the method provided by the invention, the sample coercitive force is effectively upgraded to obtain excellent comprehensive magnetic property on the basis that magnetic remanence is not reduced.

Description

technical field [0001] The invention belongs to the field of permanent magnet materials, and in particular relates to a preparation method of a high-performance permanent magnet ferrite material, in particular to a preparation process of a permanent magnet ferrite molding slurry that obtains excellent comprehensive magnetic properties. Background technique [0002] High-performance sintered permanent magnet ferrite magnet is one of the key basic functional materials of permanent magnet DC motors. It has the characteristics of high residual magnetic flux density, high coercive force and high magnetic energy product, and can meet the requirements of strong demagnetization field, low temperature, high altitude, etc. The use requirements of motors in various environments have high sensitivity and stability, and can be widely used in various types of motors with high power, high speed and high torque, such as high-end automotive motors (ABS motors, starter motors, etc.), motorcycl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 杨武国韦晓阳丁伯明
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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