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High-coercivity NdFeB permanent-magnet material and preparation method thereof

A technology of permanent magnet materials and high coercive force, which is applied in the fields of magnetic materials, inorganic material magnetism, inductor/transformer/magnet manufacturing, etc., and can solve problems such as poor temperature stability

Active Publication Date: 2015-03-25
江门旭弘磁材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of sintered magnets with high energy product (BH) and high coercivity (Hi) is also an important aspect of NdFeB research because of the poor temperature stability of sintered NdFeB magnets, and the improvement of the stability requires the improvement of magnet coercivity. main goal of

Method used

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  • High-coercivity NdFeB permanent-magnet material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: (1) According to the mass percentage of Nd 23.6%, B 1.11%, Cu 0.19%, Co 0.32%, Ga 0.13%, Nb 0.39%, Pr 3.1%, Tb 0.25%, and the balance is Fe proportioning raw materials, The raw material is put into a vacuum quick-setting throwing belt furnace, and melted into thin slices with a thickness between 0.15 and 0.25 mm;

[0017] (2) Put the flakes in step (1) into a hydrogen blasting furnace, and dehydrogenate them at 560°C for 6 hours to make hydrogen blasting powder; then pass through a jet mill to make magnetic powder with an average particle size of 1-2 μm;

[0018] (3) According to the mass percentage of Nd 14.2%, B 0.96%, Cu 0.13%, Co 0.22%, Nb 0.30%, Pr 2.6%, and the balance is Fe, the raw material is put into the vacuum quick-setting throwing belt furnace , smelted into thin slices with a thickness between 0.25 and 0.35mm;

[0019] (4) Put the flakes in step (4) into a hydrogen blasting furnace, and dehydrogenate them at 585°C for 4 hours to make hydrogen b...

Embodiment 2

[0022] Example 2: (1) According to the mass percentage of Nd 23.8%, B 1.11%, Cu 0.19%, Co 0.31%, Ga 0.13%, Nb 0.39%, Pr 3.1%, Tb 0.25%, and the balance is Fe proportioning raw materials, The raw material is put into a vacuum quick-setting throwing belt furnace, and melted into thin slices with a thickness between 0.15 and 0.25 mm;

[0023] (2) Put the flakes in step (1) into a hydrogen blasting furnace, and dehydrogenate them at 550°C for 6 hours to make hydrogen blasting powder; then pass through a jet mill to make magnetic powder with an average particle size of 1-2 μm;

[0024] (3) According to the mass percentage of Nd 14.1%, B 0.96%, Cu 0.12%, Co 0.23%, Nb 0.29%, Pr 2.6%, and the balance is Fe, the raw material is put into the vacuum quick-setting throwing belt furnace , smelted into thin slices with a thickness between 0.25 and 0.35mm;

[0025] (4) Put the flakes in step (4) into a hydrogen blasting furnace, and dehydrogenate them at 580°C for 4 hours to make hydrogen b...

Embodiment 3

[0028] Example 3: (1) According to the mass percentage of Nd 23.8%, B 1.05%, Cu 0.19%, Co 0.32%, Ga 0.13%, Nb 0.37%, Pr 3.1%, Tb 0.22%, and the balance is Fe proportioning raw materials, The raw material is put into a vacuum quick-setting throwing belt furnace, and melted into thin slices with a thickness between 0.15 and 0.25 mm;

[0029] (2) Put the flakes in step (1) into a hydrogen blasting furnace, and dehydrogenate them at 570°C for 6 hours to make hydrogen blasting powder; then pass through a jet mill to make magnetic powder with an average particle size of 1-2 μm;

[0030] (3) According to the mass percentage of Nd 14.0%, B 0.99%, Cu 0.13%, Co 0.22%, Nb 0.28%, Pr 2.7%, and the balance is Fe, the raw material is put into the vacuum quick-setting throwing belt furnace , smelted into thin slices with a thickness between 0.25 and 0.35mm;

[0031] (4) Put the flakes in step (4) into a hydrogen blasting furnace, and dehydrogenate them at 590°C for 4 hours to make hydrogen b...

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Abstract

The invention discloses a high-coercivity NdFeB permanent-magnet material. Alloy powder for producing the high-coercivity NdFeB permanent-magnet material comprises, by mass, 16-24% of Nd, 0.95-1.12% of B, 0.12-0.19% of Cu, 0.21-0.32% of Co, 0.05-0.13% of Ga, 0.28-0.40% of Nb, 2.1-3.1% of Pr, 0.12-0.25% of Tb and the balance Fe. The high-coercivity NdFeB permanent-magnet material is made from the alloy powder by being added with nano-palladium black, nano-sized titanium and nano-sized titanium nitride by sintering. The high-coercivity NdFeB permanent-magnet material has the advantages that the high-coercivity NdFeB permanent-magnet material is made from magnetic powder different in grain diameter by being added with multiple kinds of activated nanopowder by mixing uniformly through a special sintering process, and NdFeB magnets small in grain size, uniform in grain boundary phase distribution and complete in grain orientation are formed through the process, thereby being higher in coercivity; moreover, high magnetic energy product is guaranteed effectively, and balance between high coercivity and the high magnetic energy product is achieved.

Description

technical field [0001] The invention belongs to the field of magnetic functional materials, and in particular relates to a high-coercivity neodymium-iron-boron permanent magnet material and a preparation method thereof. Background technique [0002] Since Sagawa and others discovered NdFeB magnets in 1983, their excellent magnetic properties have created the highest record at that time, thus announcing the birth of the third generation of rare earth permanent magnets. The theoretical magnetic energy product (BH) can reach 64MGOe (509kJ / m3 ), the magnetic energy product (BH) in the laboratory has reached 59MGOe (469kJ / m3), and the industrial scale can produce magnets with a magnetic energy product (BH) as high as 52MGOe (413kJ / m3). However, the development of sintered magnets with high energy product (BH) and high coercivity (Hi) is also an important aspect of NdFeB research because of the poor temperature stability of sintered NdFeB magnets, and the improvement of the stabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08C22C38/16C22C33/02
CPCH01F1/0573H01F1/0576H01F1/0577H01F41/0266
Inventor 张乔木
Owner 江门旭弘磁材有限公司