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High-performance sintered neodymium-iron-boron rare-earth permanent magnetic material and preparation method thereof

A rare-earth permanent magnet and NdFeB technology, which is applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of failing to meet the requirements of the main phase of the design, achieve small impact on residual magnetism, reduce dosage, and improve coercivity force effect

Active Publication Date: 2015-12-23
NINGBO HUAHUI MAGNETIC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the rare earth is reduced, it is easy to form α-iron, which cannot meet the main phase requirements of the design

Method used

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  • High-performance sintered neodymium-iron-boron rare-earth permanent magnetic material and preparation method thereof
  • High-performance sintered neodymium-iron-boron rare-earth permanent magnetic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The first main phase magnetic powder alloy composition Nd 24 PR 6 co 1.8 Fe 61.1 Nb 0.6 al 0.30 Cu 0.2 B 1.0(mass percentage content), use the SC process to make flakes, use hydrogen explosion treatment to make the average particle size of the powder below 100 μm, and use hydrogen crushing and jet milling to make magnetic powder with an average particle size of 3.0-5.0 μm. Orientation press molding in 2T orientation magnetic field, isostatic pressing under 180MPa pressure. Sintering at 1050°C*2h, secondary heat treatment, 880°C*2h and 550°C*2h to obtain the first main phase sintered NdFeB magnet.

[0031] Alloy composition Dy of the second boundary zone structure 30 Fe 68.2 Nb 0.6 al 0.3 Cu 0.2 B 1.0 (mass percentage content), using the SC process to make flakes, using hydrogen explosion treatment to make the average particle size of the powder below 100 μm, and using hydrogen crushing and jet milling to make magnetic powder with an average particle size of...

Embodiment 2

[0037] The first main phase magnetic powder alloy composition Nd 24 PR 6 Fe 62.9 Nb 0.6 al 0.30 Cu 0.2 B 1.0 (mass percentage content), use the SC process to make flakes, use hydrogen explosion treatment to make the average particle size of the powder below 100 μm, and use hydrogen crushing and jet milling to make magnetic powder with an average particle size of 3.0-5.0 μm. Orientation press molding in 2T orientation magnetic field, isostatic pressing under 180MPa pressure. Sintering at 1050°C*2h, secondary heat treatment, 880°C*2h and 550°C*2h to obtain the first main phase sintered NdFeB magnet.

[0038] Alloy composition Dy of the second boundary zone structure 30 Fe 68.8 al 0.3 Cu 0.2 B 1.0 (mass percentage content), using the SC process to make flakes, using hydrogen explosion treatment to make the average particle size of the powder below 100 μm, and using hydrogen crushing and jet milling to make magnetic powder with an average particle size of 2.5-4.0 μm.

...

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Abstract

The invention relates to a high-performance sintered neodymium-iron-boron rare-earth permanent magnetic material and a preparation method thereof. The high-performance sintered neodymium-iron-boron rare-earth permanent magnetic material comprises first magnetic powder, second magnetic powder and third magnetic powder, wherein the first magnetic powder is used for forming a main phase; the second magnetic powder is used for forming a boundary region; the third magnetic powder is used for forming a grain-boundary phase; and the preparation method comprises the following steps: mixing 0.1%-10% of first magnetic powder, 1%-15% of third magnetic powder and the balance of a main-phase alloy magnetic body prepared from the first magnetic powder; and carrying out compression, isostatic pressing, vacuum sintering and thermal treatment, so as to obtain the high-performance sintered neodymium-iron-boron rare-earth permanent magnetic material. Boundary defects formed in the sintering process are improved; heavy rare-earth elements become boundary regions to the maximal extent; the coercive force is improved; meanwhile, the effects on the residual magnetism are reduced to the minimal extent; the magnetic property of the material is improved; the consumption of heavy rare earth is significantly reduced under the premise of obtaining equivalent magnetic property; and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of sintered NdFeB rare earth permanent magnet materials, in particular to a high-performance sintered NdFeB rare earth permanent magnet material and a preparation method thereof. Background technique [0002] Sintered NdFeB permanent magnet materials are promoting computer hard disk technology, nuclear magnetic resonance imaging technology, electric vehicles, wind power generation, industrial permanent magnet motors, consumer electronics (CD, DVD, mobile phones, audio, copiers, scanners, video cameras, cameras, refrigerators) , TV sets, air conditioners, etc.) technology and the rapid development of magnetic machinery, magnetic levitation technology, magnetic transmission technology, etc. [0003] With the continuous expansion and deepening of the application market, the requirements for sintered NdFeB permanent magnet materials are also getting higher and higher. High performance and low cost. For this reason, new ...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08B22F3/16
Inventor 钱勇
Owner NINGBO HUAHUI MAGNETIC IND
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