Sintered neodymium-iron-boron magnet deposited with compound film and preparing method thereof

A composite film and NdFeB technology, which is applied in magnets, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of expensive heavy rare earth elements, achieve easy diffusion of coating activity, high coating activity, and optimize film composition Effect

Active Publication Date: 2018-06-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, due to the high price of heavy rare earth elements, it is still an unsolved problem in this field to find a method or structure that can greatly reduce the preparation cost while increasing the same coercive force

Method used

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  • Sintered neodymium-iron-boron magnet deposited with compound film and preparing method thereof
  • Sintered neodymium-iron-boron magnet deposited with compound film and preparing method thereof
  • Sintered neodymium-iron-boron magnet deposited with compound film and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The sintered NdFeB magnets with a size of Φ10mm×3mm are degreased, derusted, and dried. Clean the sintered NdFeB magnet with nitric acid solution, and finally use deionized water and absolute ethanol to ultrasonically clean the magnet to remove impurities attached to the surface, and dry it with a hair dryer for use.

[0048] Evacuate the vacuum chamber to 1×10 -3 Pa, and then fill the vacuum chamber with high-purity Ar (purity ≥ 99.999%) for ion activation sample treatment.

[0049] The process of ion activation sample is to use ion source in vacuum chamber to ionize high-purity Ar into Ar + , apply a negative bias voltage on the sintered NdFeB magnet sample to attract high-energy Ar + Bombard the surface of the sample to further remove impurities and oxide layers to produce a clean surface.

[0050] The working parameters of the ion source are vacuum degree 0.4Pa, anode voltage 150V, anode current 1A, negative bias voltage 300V, and activation time 30min.

[0051]...

Embodiment 2

[0055] The preparation process is the same as that in Example 1, the only difference is that when depositing the heavy rare earth film, only the pure Dy target is turned on, and the coating time is controlled to obtain a pure Dy film with a film thickness of 2 μm.

Embodiment 3

[0057] The preparation process is the same as that in Example 1, the only difference is that when depositing the heavy rare earth film, the Dy target and the Tb target are turned on at the same time, the angle between the targets is adjusted so that the glow overlaps, and the target's brightness is controlled. power to prepare a Dy / Tb co-sputtered hybrid film with a thickness of 2 μm.

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Abstract

The invention discloses a sintered neodymium-iron-boron magnet deposited with compound film. The sintered neodymium-iron-boron magnet comprises a sintered neodymium-iron-boron magnet body and the compound film which is deposited on the outer surface of the sintered neodymium-iron-boron magnet body through a magnetron sputtering method; the elementary composition of the compound film comprise the essential element of Tb and / or Dy and the optional element of Cu, and the compound film is co-sputtering mixed film or alternating mixed film. By means of the sintered neodymium-iron-boron magnet deposited with the compound film, the coercive force of the sintered neodymium-iron-boron magnet is obviously improved, and the product cost is obviously lowered.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a sintered NdFeB magnet deposited with a composite film and a preparation method thereof. Background technique [0002] Sintered NdFeB permanent magnet materials are widely used in wind power generation, power vehicles and other fields. These fields require magnets to work stably at high temperatures, and the high-temperature stability of magnets is closely related to coercive force. [0003] At present, the method of increasing the coercive force of magnets is mostly achieved by increasing the magnetocrystalline anisotropy field, and adding heavy rare earth elements is an effective method to increase the magnetocrystalline anisotropy field of sintered NdFeB magnets. Generally, a certain amount of heavy rare earth elements Dy, Tb, etc. are added in the sintering process to replace the main phase Nd of the magnet. 2 Fe 14 Nd in B, forming (Nd,Dy / Tb)...

Claims

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Application Information

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IPC IPC(8): H01F7/02H01F41/02C23C14/35C23C14/16
CPCC23C14/165C23C14/35H01F7/021H01F41/0293
Inventor 宋振纶丁雪峰胡方勤杨丽景姜建军郑必长武秉晖
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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