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Method for preparing high-thermal-stability magnet through modification of zirconium-rich solvent on surface of magnetic powder

A high thermal stability, zirconium-rich technology, applied in the direction of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of large temperature coefficient, irreversible demagnetization, heavy motor, etc., and achieve low temperature coefficient of coercive force Effect

Inactive Publication Date: 2013-07-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the thermal stability of NdFeB magnets is poor, the Curie temperature is low, and the temperature coefficient is large, so its application is still limited.
Taking the automobile motor as an example, the temperature of the motor rises during operation, and it is often in an environment above 200°C. In the case of starting, reverse, sudden short circuit, etc., a large demagnetization field is generated in the motor, and irreversible demagnetization (that is, loss of magnetism) is more likely to occur. magnetic), affecting the precision and reliability of the device
At present, the method of increasing the thickness of the permanent magnet or embedding the thermistor in the motor is mainly adopted at home and abroad, but there are disadvantages such as heavy motor, increased cost, and forced motor to stop working.

Method used

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  • Method for preparing high-thermal-stability magnet through modification of zirconium-rich solvent on surface of magnetic powder
  • Method for preparing high-thermal-stability magnet through modification of zirconium-rich solvent on surface of magnetic powder
  • Method for preparing high-thermal-stability magnet through modification of zirconium-rich solvent on surface of magnetic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) The main phase alloy adopts the quick-setting sheet technology, the surface line speed of the copper roller is 1.2m / s, and the composition is Nd 13.12 Fe 80.69 B 5.73 (Dy 0.22 al 0.24 )(at%).

[0027] 2) Powder the main phase alloy. The primary crushing is carried out by a jaw crusher, the secondary crushing is carried out by a secondary crusher, and then the powder with an average particle diameter of 3.4 μm is made by jet milling under the protection of nitrogen.

[0028] 3) Uniformly mix the zirconium n-propoxide solvent with the main phase alloy powder, antioxidant, and gasoline in a mixer to form a mixed powder, wherein the weight of the zirconium n-propoxide solvent accounts for 3% of the total weight, and the antioxidant polyethylene oxide Alkyl ether accounts for 1% of the total weight, and gasoline accounts for 1% of the total weight.

[0029] 4) The mixed powder is pressed into a parison by a magnetic field orientation forming press, and the forming o...

Embodiment 2

[0036] 1) The main phase alloy adopts the quick-setting sheet technology, the surface line speed of the copper roller is 2.0m / s, and the composition is Nd 14.2 Fe 78.23 B 5.81 (Tb 0.33 al 0.24 co1 Nb 0.18 )(at%).

[0037] 2) Powder the main phase alloy. The coarse crushing is carried out by a jaw crusher, the secondary crushing is carried out by a secondary crusher, and then the powder with an average particle diameter of 3.3 μm is made by jet milling under the protection of nitrogen.

[0038] 3) Uniformly mix zirconium n-butoxide solvent with main phase alloy powder, antioxidant and gasoline in a mixer to form a mixed powder, in which the weight of zirconium n-butoxide solvent accounts for 8% of the total weight, and the antioxidant polyethylene oxide Mono fatty acid ester accounts for 4% of total weight, gasoline accounts for 1% of total weight.

[0039] 4) The mixed powder is pressed into a parison by a magnetic field orientation forming press, and the forming orient...

Embodiment 3

[0046] 1) The main phase alloy is made of NdFeB ingot alloy by casting process, and the composition is Nd 11.06 Fe 82.4 B 5.85 Dy 0.89 (at%).

[0047] 2) Powder the main phase alloy. The coarse crushing is carried out by a jaw crusher, the secondary crushing is carried out by a secondary crusher, and then the powder with an average particle diameter of 4.3 μm is made by jet milling under the protection of nitrogen.

[0048] 3) Uniformly mix the zirconium tetra-tert-butoxide solvent with the main phase alloy powder, antioxidant, and gasoline in a mixer to form a mixed powder, in which the weight of the zirconium tetra-tert-butoxide solvent accounts for 2% of the total weight, and the antioxidant polyepoxide Ethane mono fatty acid ester accounts for 4% of the total weight, and gasoline accounts for 2% of the total weight.

[0049] 4) The mixed powder is pressed into a parison by a magnetic field orientation forming press, and the forming orientation magnetic field is 1.6T, ...

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Abstract

The invention discloses a method for preparing a high-thermal-stability magnet through the modification of a zirconium-rich solvent on the surface of magnetic powder. The method comprises the following steps of: (1) on the basis of main phase alloy, preparing neodymium iron boron ingot casting alloy by using a casting process, or preparing a neodymium iron boron rapid hardening sheet by using a sheet rapid hardening process; (2) powdering the main phase alloy; (3) uniformly mixing the zirconium-rich solvent with the main phase alloy, and performing compression molding in a magnetic field; and (4) preparing a sintered magnet in a high vacuum sintering furnace. The sintered neodymium iron boron prepared by using the method is high in maximum working temperature, large in coercive force, low in residual magnetization temperature coefficient and low in coercive force temperature coefficient. The process can be used for large-scale batch production. By using the method, the sintered neodymium iron boron with high thermal stability can be prepared.

Description

technical field [0001] The invention relates to a method for preparing a magnet with high thermal stability by modifying the surface of a magnetic powder with a zirconium-rich solvent. Background technique [0002] NdFeB rare earth permanent magnet materials have excellent comprehensive magnetic properties. Permanent magnet motors are the largest application field of NdFeB magnets, accounting for about 70% of the total magnets. It can significantly improve the efficiency of the motor, and the average power saving rate is as high as 10%. , some special motors can save electricity by as much as 15%-20%, and help to reduce the size of the motor and reduce CO 2 emissions. Especially in the field of high-power motors with harsh application conditions, such as: the drive systems of electric vehicles, hybrid vehicles, trains, machine tools, robots, etc. tend to use high-efficiency NdFeB permanent magnet motors, and its market has become more and more Big. There are about 1.5 mil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/053
Inventor 于濂清王清清董开拓郭亮亮韩雪薛庆忠
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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