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

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.

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...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a surface diffusion source spraying method of NdFeB series rare earth permanent magnets and a magnet manufacturing method, which can effectively solve the problem of inconsistent performance of existing NdFeB series rare earth permanent magnets

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