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A kind of NdFeB magnet preparation method and non-breakable NdFeB magnet

A technology of NdFeB and magnets, which is applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as internal improvement methods and insufficient demand, and limited protection, so as to speed up research and development efficiency and product updates , Magnetic properties have little effect

Active Publication Date: 2021-07-23
宁波合力磁材技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the actual protective effect is limited, which is far less than the internal improvement methods and needs

Method used

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  • A kind of NdFeB magnet preparation method and non-breakable NdFeB magnet
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  • A kind of NdFeB magnet preparation method and non-breakable NdFeB magnet

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] [A preparation method of NdFeB magnet]

[0038] A kind of preparation method of neodymium iron boron magnet, comprises the following steps:

[0039] S1: The NdFeB cast pieces are subjected to hydrogen crushing, disproportionation reaction and jet milling to obtain NdFeB fine powder. The NdFeB cast pieces are obtained from commercially available or self-designed ingredients and added rare earth alloys, and the alloys are smelted , obtained from quick-setting cast sheets, and the Al content in the NdFeB cast sheets is less than 0.1wt%;

[0040] S2: Sieve the NdFeB fine powder with a particle size of 3-4μm from S1, and the Al powder with a particle size of 500-600nm in proportion to the mass ratio of NdFeB fine powder: Al powder (96.5:3.5)~(95.4:4.6 ) mixed, mixed under an inert atmosphere, and mixed uniformly to obtain NdFeB raw material powder;

[0041] S3: Orientation forming of NdFeB raw material powder in a magnetic field to obtain a rough NdFeB magnet;

[0042] S4: ...

Embodiment 1～6

[0049] A NdFeB magnet was prepared according to the above preparation method to prepare NdFeB magnets to obtain the NdFeB magnets of Examples 1-6, wherein the specific parameters of Examples 1-6 are shown in Table 1.

[0050]

[0051] The NdFeB magnets prepared in Examples 1-6 were tested for bending strength, fracture toughness, impact toughness, and magnetic properties, and the test results are shown in Table 2 below.

[0052] [Bending strength test]

[0053] The test is carried out according to the flexural strength test method recorded in "GB / T 31967.2-2015 Test Method for Physical Properties of Rare Earth Permanent Magnet Materials Part 2: Determination of Flexural Strength and Fracture Toughness".

[0054] [Fracture Toughness Test]

[0055] Test according to the fracture toughness test method recorded in "GB / T 31967.2-2015 Physical Properties of Rare Earth Permanent Magnet Materials Part 2: Determination of Flexural Strength and Fracture Toughness".

[0056] [Impact...

Embodiment 7

[0075] A kind of neodymium iron boron magnet, based on the basis of embodiment 4, its difference is to adjust the neodymium iron boron formula, remove Dy, Tb, Sb element material addition, the element detection result in the obtained neodymium iron boron sintered magnet is Nd: 28wt%; Dy: 0wt%; Tb: 0wt%; B: 1.3wt%; Al: 4.3wt%; Co: 0.8wt%;

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Abstract

The invention relates to a sintered NdFeB magnet, and discloses a preparation method of an NdFeB magnet and an unbreakable NdFeB magnet. Aluminum powder and NdFeB fine powder are mixed and pressed to form a rough NdFeB magnet, and then the rough NdFeB magnet is formed NdFeB magnets are sintered in a vacuum environment, the sintering temperature is higher than the melting point of aluminum, and the aluminum powder melts as a heat transfer body between NdFeB fine powders, which promotes the sintering process and improves the compactness of NdFeB sintered magnets after sintering. Then improve the strength of NdFeB sintered magnets. At the same time, during the sintering and densification process of NdFeB magnets, the molten aluminum flows under the pressure of NdFeB fine powder particles, filling the remaining pores of the rough NdFeB magnets, further strengthening the structural strength of NdFeB sintered magnets, and then with a smaller cost, improve the strength of NdFeB sintered magnets, and reduce the possibility of damage to the NdFeB magnets produced by the application due to external forces, so as to obtain a NdFeB magnets that are not easily damaged when subjected to external forces.

Description

technical field [0001] The invention relates to a sintered NdFeB magnet, in particular to a preparation method of an NdFeB magnet and an unbreakable NdFeB magnet. Background technique [0002] Neodymium magnet (Neodymium magnet), also known as NdFeB magnet (NdFeB magnet), is a tetragonal crystal formed by neodymium, iron, and boron. Among the current magnet materials, neodymium magnets are famous for their high magnetic properties and high cost performance. NdFeB magnets are divided into sintered NdFeB magnets and bonded NdFeB magnets according to their preparation methods. Bonded NdFeB is molded by injection molding, and has magnetism in all directions and is corrosion-resistant, but because of the binder, the density is generally only 80% of the theoretical one. Sintered NdFeB Anisotropic magnets produced by sintering NdFeB powder have high density and stronger performance than bonded NdFeB. At present, they have reached more than 50M, but their corrosion resistance is po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266
Inventor 赵吉明韩春昌赵文超
Owner 宁波合力磁材技术有限公司
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