Ferrite material for motor and preparation method of ferrite material

A technology of ferrite materials and fine materials, which is applied in the field of ferrite materials for motors and its preparation, can solve the problems affecting the production efficiency of high-performance permanent magnet ferrite, the consistency of product performance cannot be guaranteed, and the preparation process is complicated. , to achieve the effect of improving magnetic properties, excellent magnetic properties, and simple process steps

Active Publication Date: 2019-02-15
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although rare earth magnets (such as Nd-Re-B) have high performance, their resistivity is low, expensive, and there are also problems of easy oxidation. Therefore, permanent magnets are generally used in harsh environments such as motors. Ferrite motor
[0004] At present, the high-performance permanent magnet ferrite calcined material basically uses red iron oxide as raw material, and its production cost is relatively high; in the traditional preparation process, ball mills are often used to grind the calcined material, which has the disadvantages of long grinding time and energy consumption. High, the material is easy to block during the grinding process, and the output is low, which seriously affects the production efficiency of high-performance permanent magnet ferrite.
[0005] The Chinese patent literature discloses "a production method of permanent ferrite", and its announcement number is CN107337448A. The invention uses iron scale, zirconium dioxide, strontium carbonate and calcium carbonate as the main ingredients, and wet mixes to obtain a slurry. After pre-burning, the pre-burned material is obtained, and then through coarse crushing, fine crushing, magnetic field forming, and sintering, it can be used to manufacture permanent magnet ferrite with high requirements such as permanent magnet synchronous motors, but the preparation process of this invention is complicated and the product performance is consistent. cannot be guaranteed

Method used

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  • Ferrite material for motor and preparation method of ferrite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) will pass through Sr 0.85 La 0.15 Fe 11.9 co 0.1 o 19 The calculated amounts of strontium carbonate, iron powder and additives are stored in the material barrel through automatic batching;

[0036] (2) Mix the powder obtained in (1) through a strong mixer for 8 minutes to ensure that it is evenly mixed;

[0037] (3) Pass the powder mixed in (2) through a two-stage compactor to ensure that the powder is mixed more evenly and the particle size is controlled to 2.5 μm;

[0038] (4) Use the powder obtained in (3) to make balls through a ball making machine. The ball diameter is controlled at 6-12mm. It is better to drop the balls at a height of 0.5 meters to the cement floor twice without breaking, so as to ensure the strength of the balls. ;

[0039] (5) Pass the ball obtained in (4) through a grate machine to remove fine balls and powder, and then enter the rotary kiln for sintering at 1300 ° C. The sintering time is controlled at 50 minutes, and solid reaction ...

Embodiment 2

[0043] (1) will pass through Sr 0.85 La 0.15 Fe 11.8 co 0.1 o 19 The calculated amounts of strontium carbonate, iron powder and additives are stored in the material barrel through automatic batching;

[0044] (2) Mix the powder obtained in (1) through a strong mixer for 13 minutes to ensure that it is evenly mixed;

[0045] (3) Pass the powder mixed in (2) through a two-stage compactor to ensure that the powder is mixed more evenly and the particle size is controlled to 2.0 μm;

[0046] (4) Use the powder obtained in (3) to make balls through a ball making machine. The ball diameter is controlled at 6-12mm. It is better to drop the balls at a height of 0.5 meters to the cement floor twice without breaking, so as to ensure the strength of the balls. ;

[0047] (5) Pass the ball obtained in (4) through a grate machine to remove the fine balls and powder, and then enter the rotary kiln for sintering at 1330 ° C. The sintering time is controlled at 40 minutes, and the solid ...

Embodiment 3

[0051] (1) will pass through Sr 0.85 La 0.15 Fe 11.8 co 0.1 o 19 The calculated amounts of strontium carbonate, iron powder and additives are stored in the material barrel through automatic batching;

[0052] (2) Mix the powder obtained in (1) through a strong mixer for 13 minutes to ensure that it is evenly mixed;

[0053] (3) Pass the powder mixed in (2) through a two-stage compactor to ensure that the powder is mixed more evenly and the particle size is controlled to 3.0 μm;

[0054] (4) Use the powder obtained in (3) to make balls through a ball making machine. The ball diameter is controlled at 6-12mm. It is better to drop the balls at a height of 0.5 meters to the cement floor twice without breaking, so as to ensure the strength of the balls. ;

[0055] (5) Pass the ball obtained in (4) through a grate machine to remove fine balls and powder, and then enter the rotary kiln for sintering at 1350 ° C. The sintering time is controlled at 30 minutes, and solid reaction...

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Abstract

The invention relates to the technical field of permanent magnetic ferrite materials, and provides a ferrite material for a motor and a preparation method of the ferrite material for solving the problems of easy blockage, low yield and the like in the traditional preparation process of the permanent magnet ferrite. The mole ratio and ion exchange content of the ferrite material for the motor are determined according to the following molecular formula: Sr1-xAxFe<3+>2n-yByO19, wherein A is selected from at least one of rare earth elements, and necessarily comprises La; B is selected from at least one element of Bi, Co, Mn and Zn, and necessarily comprises Co, and the component ratios of A, B and Fe are as follows: X is greater than or equal to 0.1 and smaller than or equal to 0.4, y is greater than or equal to 0.05 and smaller than or equal to 0.25, and n is greater than or equal to 5.9 and smaller than or equal to 6.1. The process disclosed by the invention is simple in steps, sufficient in grinding, high in yield, high in grinding speed, low in energy consumption and unlikely to block, and the prepared ferrite material for the motor has excellent magnetic property and is good in product consistency.

Description

technical field [0001] The invention relates to the technical field of permanent magnet ferrite materials, in particular to a ferrite material for motors and a preparation method thereof. Background technique [0002] Since the discovery of permanent magnet ferrite in the 1950s, its varieties, production methods and production technology have been greatly developed, from isotropic magnets to anisotropic magnets, from barium ferrite to strontium ferrite Body and major technological leaps from dry pressing to wet pressing. [0003] Since the successful development of hexagonal M-type barium ferrite, the performance of permanent magnet ferrite has been continuously improved and enhanced. In order to adapt to the miniaturization and weight reduction of automobile motors and improve the efficiency of motors used in air conditioners and other household appliances, it is urgent to improve the magnetic properties of Sr ferrite. Although rare earth magnets (such as Nd-Re-B) have hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/626
CPCC04B35/2683C04B35/622C04B35/62605C04B2235/3208C04B2235/3227C04B2235/3275C04B2235/3418C04B2235/6567
Inventor 胡良权丁伯明叶华韦晓阳徐君何震宇赵小瑜
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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