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Neodymium-iron-boron permanent magnet material

A permanent magnet material, NdFeB technology, applied in the direction of magnetic materials, permanent magnet manufacturing, magnetic objects, etc., can solve the problems of easy powder corrosion, low Curie temperature point, poor temperature characteristics, etc., to improve corrosion resistance and mechanical properties, increase coercivity, improve the effect of coercivity

Active Publication Date: 2017-04-26
宁波元辰新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a large chemical potential difference between the phases of sintered NdFeB magnets, and it is easy to form a corrosion battery in a humid environment, resulting in intergranular corrosion.
In addition, it contains a large amount of precious rare earth element neodymium, which is expensive, brittle, has a low Curie temperature, poor temperature characteristics, and is easy to pulverize and corrode. These defects restrict the development of many motors or permanent magnet industries.

Method used

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  • Neodymium-iron-boron permanent magnet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A NdFeB permanent magnet material is provided, which is prepared by the following method:

[0028] (1) Mix Fe (iron), Nd (neodymium), B (boron), Hf (hafnium), and P (phosphorus) according to the mass ratio of 72:26:1:0.5:0.5, and place the mixed raw materials in the intermediate frequency Vacuum induction melting furnace for melting, the heat treatment temperature is 1200 °C, and the sintering time is 2 hours to obtain rare earth permanent magnet ingots;

[0029] (2) processing the rare earth permanent magnet ingot obtained in step (1) into rare earth magnetic powder with an average particle diameter of 1 μm through hydrogen explosion and jet milling;

[0030] (3) Get 80g of the rare earth magnetic powder and 5g of 100-purpose Zn-Al alloy powder, use a plasma processor, plasma process 20min under the radio frequency power of 60W, the gas that feeds in the plasma processor chamber is argon Gas, the gas flow rate is 10ml / s, and the cavity pressure is maintained at 0.2Pa;...

Embodiment 2

[0036] A NdFeB permanent magnet material is provided, which is prepared by the following method:

[0037] (1) Mix Fe (iron), Nd (neodymium), B (boron), Hf (hafnium), and P (phosphorus) according to the mass ratio of 72:26:1:0.5:0.5, and place the mixed raw materials in the intermediate frequency Vacuum induction melting furnace for melting, the heat treatment temperature is 1250°C, and the sintering time is 2.5 hours to obtain rare earth permanent magnet ingots;

[0038] (2) processing the rare earth permanent magnet ingot obtained in step (1) into rare earth magnetic powder with an average particle diameter of 1.5 μm through hydrogen explosion and jet milling;

[0039] (3) Get the described rare earth magnetic powder of 80g and the 200 mesh Zn-Al alloy powder of 5g, use the plasma processing instrument, be that the radio frequency power is 60W plasma processing 20min, the gas that feeds in the plasma processing instrument cavity is argon Gas, the gas flow rate is 10ml / s, and...

Embodiment 3

[0045] A NdFeB permanent magnet material is provided, which is prepared by the following method:

[0046] (1) Mix Fe (iron), Nd (neodymium), B (boron), Hf (hafnium), and P (phosphorus) according to the mass ratio of 72:26:1:0.5:0.5, and place the mixed raw materials in the intermediate frequency Vacuum induction melting furnace for melting, the heat treatment temperature is 1250°C, and the sintering time is 2.5 hours to obtain rare earth permanent magnet ingots;

[0047] (2) processing the rare earth permanent magnet ingot obtained in step (1) into rare earth magnetic powder with an average particle diameter of 1.5 μm through hydrogen explosion and jet milling;

[0048] (3) get the described rare earth magnetic powder of 80g and the 300 purpose Zn-Al alloy powder of 5g, use plasma processor, under radio frequency power is 150W plasma process 25min, the gas that feeds in the plasma processor cavity is argon Gas, the gas flow rate is 70ml / s, and the cavity pressure is maintaine...

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Abstract

The invention discloses a neodymium-iron-boron permanent magnet material. The neodymium-iron-boron permanent magnet material is prepared by the following steps of preparing a rare earth permanent magnet ingot; smashing the rare earth permanent magnet ingot into rare earth magnetic powder; performing surface plasma treatment on the rare earth magnetic powder and Zn-Al alloy powder; preparing fluorinated graphene; mixing the rare earth magnetic powder, the Zn-Al alloy powder, the fluorinated graphene and auxiliaries, shaping under a magnetic field and sintering to obtain a primary product; and forming a corrosion resistant layer on the surface of the primary product. The neodymium-iron-boron permanent magnet material prepared by the invention has relatively high residual magnetism, coercivity, working temperature, corrosion resistance and flexibility.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to an NdFeB permanent magnet material. Background technique [0002] NdFeB permanent magnet materials are known as the "Magnetic King" due to their extremely high magnetic energy product, coercive force and energy density. They are widely used in computer hardware drive equipment, various household appliances, electroacoustic equipment, multimedia equipment, Electronic instruments, meters, medical equipment, industrial motors, wind turbines, and automotive sensors, drive motors for electric vehicles and hybrid vehicles, etc. However, there is a large chemical potential difference between the phases of sintered NdFeB magnets, and it is easy to form a corrosion battery in a humid environment, and intergranular corrosion occurs. In addition, it contains a large amount of precious rare earth element neodymium, which is expensive, brittle, has a low Curie temperature, poor te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0572H01F1/0573H01F1/0576H01F1/0577H01F41/026H01F41/0266
Inventor 贝振军
Owner 宁波元辰新材料有限公司
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