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High-magnetic-energy-product sintered NdFeB permanent-magnet material and preparation method

A permanent magnet material and high magnetic energy product technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of poor temperature characteristics, low Curie temperature point, easy pulverization and corrosion, etc., and achieve the improvement of coercive force Effect

Active Publication Date: 2015-03-25
赣州诚正稀土新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NdFeB has extremely high magnetic energy product and coercive force. At the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology. The advantages of NdFeB are high cost performance and good performance. Mechanical properties; the disadvantage is that the Curie temperature point is low, the temperature characteristics are poor, and it is easy to pulverize and corrode. It must be improved by adjusting its chemical composition and adopting surface treatment methods to meet the requirements of practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: The method for preparing this high energy product sintered NdFeB permanent magnet material comprises the following steps:

[0017] (1) According to the mass percentage of Nd 25.9%, B 0.81%, Cu 0.48%, Co 0.27%, Ga 0.37%, Nb 1.08%, Pr 4.1%, Al 0.36%, and the balance is Fe. Put it into a vacuum quick-setting and throwing belt furnace, and melt it into thin slices with a thickness between 0.2 and 0.3mm;

[0018] (2) Put the flakes in step (1) into a hydrogen furnace, and dehydrogenate them at 560°C for 6 hours to make coarse powder; then pass through a jet mill to make magnetic powder with an average particle size of 2-3 μm;

[0019] (3) Mix nano-bismuth powder, nano-strontium ferrite, nano-molybdenum disulfide, and triethanolamine according to the ratio of 16:42:6:3, add it to QDmill / Strong SC-H nano-ultrafine grinder, grind and mix 1.5 hours, obtain nano-mixed powder;

[0020] (4) Take 100 kg of magnetic powder in step (2) and 8 kg of nano-mixed powder in ...

Embodiment 2

[0023] Embodiment 2: The method for preparing the high energy product sintered NdFeB permanent magnet material comprises the following steps:

[0024] (1) According to the mass percentage of Nd 25.6%, B 0.76%, Cu 0.45%, Co 0.25%, Ga 0.35%, Nb 1.04%, Pr 3.9%, Al 0.34%, and the balance is Fe. Put it into a vacuum quick-setting and throwing belt furnace, and melt it into thin slices with a thickness between 0.2 and 0.3mm;

[0025] (2) Put the flakes in step (1) into a hydrogen furnace, and dehydrogenate them at 550°C for 6 hours to make coarse powder; then pass through a jet mill to make magnetic powder with an average particle size of 2-3 μm;

[0026] (3) Mix nano-bismuth powder, nano-strontium ferrite, nano-molybdenum disulfide, and triethanolamine according to the ratio of 16:42:6:3, add it to QDmill / Strong SC-H nano-ultrafine grinder, grind and mix 1 hour, obtain nano-mixed powder;

[0027] (4) Take 100 kg of magnetic powder in step (2) and 8 kg of nano-mixed powder in step...

Embodiment 3

[0030] Embodiment 3: The method for preparing this high energy product sintered NdFeB permanent magnet material comprises the following steps:

[0031] (1) According to the mass percentage of Nd 27.1%, B 0.89%, Cu 0.53%, Co 0.32%, Ga 0.43%, Nb 1.16%, Pr 4.6%, Al 0.41%, and the balance is Fe. Put it into a vacuum quick-setting and throwing belt furnace, and melt it into thin slices with a thickness between 0.2 and 0.3mm;

[0032] (2) Put the flakes in step (1) into a hydrogen furnace, and dehydrogenate them at 570°C for 6 hours to make coarse powder; then pass through a jet mill to make magnetic powder with an average particle size of 2-3 μm;

[0033] (3) Mix nano-bismuth powder, nano-strontium ferrite, nano-molybdenum disulfide, and triethanolamine according to the ratio of 16:42:6:3, add it to QDmill / Strong SC-H nano-ultrafine grinder, grind and mix 2 hours, obtain nano-mixed powder;

[0034] (4) Take 100 kg of magnetic powder in step (2) and 8 kg of nano-mixed powder in st...

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Abstract

The invention discloses a high-magnetic-energy-product sintered NdFeB permanent-magnet material made from NdFeB powder, bismuth nanoparticles, nano-strontium ferrites and nano-molybdenum disulfide by sintering. The NdFeB powder comprises, by mass, 25.6-27.1% of Nd, 0.76-0.89% of B, 0.45-0.53% of Cu, 0.25-0.32% of Co, 0.35-0.43% of Ga, 1.04-1.16% of Nb, 3.9-4.6% of Pr, 0.34-0.41% of Al and the balance Fe. The high-magnetic-energy-product sintered NdFeB permanent-magnet material has the advantages that the material is made by wrapping a main-phase grain surface layer by nano mixed powder in a homogeneous dispersion manner by means of two-time sintering and two-time tempering; the material has high residual magnetism reaching 1.46T and maximum magnetic energy product reaching 438kJ / m<3>; meanwhile, coercivity of the material is also improved.

Description

technical field [0001] The invention belongs to the field of magnetic functional materials, and in particular relates to a high energy product sintered NdFeB permanent magnet material and a preparation method thereof. Background technique [0002] NdFeB is a magnetic material, known as the "Magnetic King" because of its excellent magnetic properties. NdFeB magnetic materials are alloys of neodymium, iron oxide, etc. Also known as magnetic steel. NdFeB has extremely high magnetic energy product and coercive force. At the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology. The advantages of NdFeB are high cost performance and good performance. Mechanical properties; the disadvantage is that the Curie temperature point is low, the temperature characteristics are poor, and it is easy to pulverize and corrode. It must be improved by adjusting its chemical composition and adopting surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F1/00B22F3/16
Inventor 乔俊擎
Owner 赣州诚正稀土新材料股份有限公司
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