Spraying method of NdFeB rare earth permanent magnet surface diffusion source and magnet manufacturing method

A technology of rare earth permanent magnet and surface diffusion, which is applied to the surface coating liquid device, inductance/transformer/magnet manufacturing, pretreatment surface, etc., can solve the problems of inconsistent performance of NdFeB rare earth permanent magnets, etc., to ensure Consistency, reduced manufacturing costs, and improved performance consistency

CN111266273AInactive Publication Date: 2020-06-12ZHEJIANG INNUOVO MAGNETICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-06-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a spraying method of an NdFeB rare earth permanent magnet surface diffusion source. The diffusion source is sprayed on the surface of a magnetic through a spraying gun, the magnet is put on a tray to move, the spraying gun reciprocates to spray a solution of the diffusion source, and the moving velocity of the spraying gun, the moving velocity of the tray and the number oftimes of the spraying gun passing by the single magnet meet the following equation (please see the equation in the description), wherein l magnet represents the length of the magnet, N represents thenumber of times of the spraying gun passing by the single magnet, V tray represents the moving velocity of the tray, V spraying gun represents the moving velocity of the spraying gun and is perpendicular to the moving direction of the tray, V tray=2-5 cm / s, a=0.2-0.9, b=(1.1-3.2)*10^11, and c=450-800. By means of a manufacturing method of the NdFeB magnet, a magnet blank is manufactured, blasting,acid pickling and grinding are performed on the surface of the blank, heating treatment is performed on the blank, then spraying is performed according to the method, and finally ageing treatment isperformed. The spraying method has the advantages that the spraying consistency is ensured during spraying, the lower limit of the product is ensured, the spraying amount is reduced, meanwhile the performance consistency of the magnet is improved, and manufacturing cost is reduced.
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Description

technical field

[0001] The invention relates to a surface diffusion source spraying method of NdFeB series rare earth permanent magnets and a magnet manufacturing method. Background technique

[0002] Sintered NdFeB permanent magnet materials have quite high intrinsic coercive force and magnetic energy product, and are widely used in electronics, electrical machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields, and the more common ones are permanent magnet motors , loudspeakers, magnetic separators, computer disk drives, magnetic resonance imaging equipment instruments, etc.

[0003] However, the magnetic stability of sintered NdFeB is poor, which hinders the application and development of high-tech fields. In order to improve the overall performance of NdFeB, the magnetic properties of NdFeB are currently improved by doping heavy rare earth metal dysprosium and terbium. due to Dy 2 Fe 14 B(Tb 2 Fe 14 The B) phase has a higher an...

Examples

Embodiment Construction

[0026] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0027] The surface diffusion source spraying method of NdFeB series rare earth permanent magnets uses a spray gun to spray the diffusion source on the surface of the magnet. The diffusion source generally uses dysprosium fluoride or terbium fluoride or dysprosium hydride or terbium hydride, and the magnet is placed on the material tray to move. The spray gun reciprocates to spray the diffusion source solution, and the moving speed of the spray gun, the moving speed of the material tray and the number of times the spray gun passes through the single magnet satisfy the following relationship:

[0028]

[0029] where l 磁体 is the length of the magnet, N is the nu...