Gradient coercive-force neodymium-ferrum-boron magnet and production method thereof

A production method and coercive force technology, applied in the direction of magnets, magnetic objects, magnetic materials, etc., can solve the problems of the decrease of the magnetic energy product of the magnet, the decrease of the motor output, and the increase of the magnet, so as to reduce the thermal demagnetization, improve the overall remanence, Resistant to high temperature and reverse magnetic fields

Active Publication Date: 2010-09-29
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, we use 40SH and 38UH magnets with higher coercive force to test at a temperature of 150°C. The results show that the loss of magnetism is very small. The increase of the coercive force will lead to a decrease in the magnetic energy product of the magnet, resulting in a significant decrease in the output of the motor. If you want to keep the surface magnetism of the magnet in the motor unchanged, you must increase the number of magnets, which will increase the cost.

Method used

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  • Gradient coercive-force neodymium-ferrum-boron magnet and production method thereof
  • Gradient coercive-force neodymium-ferrum-boron magnet and production method thereof
  • Gradient coercive-force neodymium-ferrum-boron magnet and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 48H-42SH gradient coercivity NdFeB magnets:

[0026] Change the recipe to Nd 20 PR 5.5 Dy 4.5 co 2 Cu 0.15 Ga 0.1 al 0.2 B 1 Nb 0.1 Fe 余量 The raw material is smelted into alloy A in a vacuum strip continuous casting furnace, and the formula is Nd 21 PR 6 Dy 2.5 co 1 Cu 0.1 Ga 0.1 B 1 Nb 0.1 Fe 余量 The raw materials are smelted into alloy B in the vacuum strip continuous casting furnace, and the alloy sheets A and B are respectively put into the hydrogen treatment furnace for hydrogen crushing. After the hydrogen crushing, the N 2 In an oxygen-free environment under the protection of gas, the powder is finely pulverized by jet mill to obtain a powder particle size of 3.6 μm;

[0027] Molded in the vertical magnetic orientation forming device of the atmosphere with an oxygen content of less than 1%; in the mold cavity with a length of 72mm and an orientation direction of 22mm, a copper separator with a length of 71.9mm, a height of 105mm, and a thickness ...

Embodiment 2

[0036] 44H-38UH gradient coercivity NdFeB magnet:

[0037] Change the recipe to Nd 20 PR 5.2 Dy 6 co 1 Cu 0.1 Ga 0.15 B 0.97 Nb 0.1 Fe 余量 The raw material is smelted into alloy A in a vacuum strip continuous casting furnace, and the formula is Nd 24.8 PR 4.5 Dy2.4 co 0.8 Cu 0.1 Ga 0.1 al 0.15 B 0.95 Nb 0.1 Fe 余量 The raw materials are smelted into alloy B in the vacuum strip continuous casting furnace, and the alloy sheets A and B are respectively put into the hydrogen treatment furnace for hydrogen crushing. After the hydrogen crushing, the N 2 In an oxygen-free environment under the protection of gas, it is finely pulverized by a jet mill to obtain a powder particle size of 3.5 μm; it is formed in a parallel magnetic orientation molding device in an atmosphere with an oxygen content of less than 1%, and the length direction is 75 mm, and the width direction is 50 mm. The mold cavity is first filled with powder of alloy A to a height of 5.5mm, and then filled ...

Embodiment 3

[0046] 42SH-48H-42SH gradient coercivity NdFeB magnets:

[0047] Change the recipe to Nd 20 PR 5.5 Dy 4.5 co 2 Cu 0.15 Ga 0.1 al 0.2 B 1 Nb 0.1 Fe 余量 The raw material is smelted into alloy A in a vacuum strip continuous casting furnace, and the formula is Nd 21 PR 6 Dy 2.5 co 1 Cu 0.1 Ga 0.1 B 1 Nb 0.1 Fe 余量 The raw materials are smelted into alloy B in the vacuum strip continuous casting furnace, and the alloy sheets A and B are respectively put into the hydrogen treatment furnace for hydrogen crushing. After the hydrogen crushing, the N 2 In an oxygen-free environment under the protection of gas, the powder is finely pulverized by jet mill to obtain a powder particle size of 3.6 μm;

[0048] Molded in a vertical magnetic orientation molding device with an atmosphere with an oxygen content of less than 1%; a copper separator 2 with a length of 71.9 mm, a height of 105 mm, and a thickness of 0.5 mm is placed in a cavity with a length of 72 mm and an orientati...

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Abstract

The invention discloses a gradient coercive-force neodymium-ferrum-boron magnet and a production method thereof, and relates to a neodymium-ferrum-boron permanent-magnet material with the gradient coercive-force. The invention aims to provide the gradient coercive-force neodymium-ferrum-boron magnet with high magnetic characteristics and high demagnetization resistance and the production method thereof. The gradient coercive-force neodymium-ferrum-boron magnet comprises at least two neodymium-ferrum-boron magnetic material layers with different coercive forces, including a high coercive force surface layer and at least one low coercive force middle layer, wherein the high coercive force surface layer is connected with the low coercive force middle layer in the orientating direction through a sintered layer.

Description

technical field [0001] The invention relates to a neodymium-iron-boron permanent magnet material, in particular to a neodymium-iron-boron magnet with gradient coercive force and a production method thereof. Background technique [0002] NdFeB series rare earth permanent magnets have been used more and more because of their excellent magnetic properties, and are widely used in the fields of nuclear magnetic resonance, computers, hybrid vehicles, various motors and wind power generators. According to the different application fields of NdFeB series rare earth permanent magnets, there are obvious differences in their performance and composition. Under normal circumstances, NdFeB magnets made of rare earth Pr and Nd have low coercive force, poor resistance to reverse magnetic field and high temperature, and are easy to lose magnetism. They can only be used in low reverse magnetic fields and different temperatures. in an environment that is too high. By adding heavy rare earth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/057H01F41/02B22F9/04B22F3/16
CPCH01F1/0577C22C38/14B22F2201/013C22C38/002C22C38/10C22C38/12C22C38/005B22F2998/10C22C28/00H01F41/0273B22F2999/00C22C38/06C22C2202/02C22C33/02C22C38/16H01F7/021H01F1/01B22F9/04B22F2009/044B22F3/02B22F3/10B22F2202/05
Inventor 王庆凯于永江郭宁
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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