A kind of preparation method of suspension liquid plasma spraying coating on the surface of NdFeB magnet

A suspension, NdFeB technology, applied in coating, metal material coating process, inductor/transformer/magnet manufacturing, etc., can solve the problem of low utilization rate of target and evaporation material, high target manufacturing cost, coating Problems such as low binding force, to achieve the effect of fine microstructure, high production efficiency and high specific surface area

Active Publication Date: 2021-11-12
INNER MONGOLIA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, coatings prepared by dipping and coating methods have low bonding force, and coating peeling and peeling are prone to occur in the thermal diffusion of grain boundaries.
However, methods such as magnetron sputtering and evaporation have low production efficiency, high target manufacturing costs, and low utilization rates of target materials and evaporation materials.
Methods such as electroplating and chemical plating have serious environmental pollution
Therefore, most of the current thermal diffusion treatment technologies for heavy rare earth elements are still limited to laboratories, and there is still a long way to go before large-scale production.

Method used

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  • A kind of preparation method of suspension liquid plasma spraying coating on the surface of NdFeB magnet
  • A kind of preparation method of suspension liquid plasma spraying coating on the surface of NdFeB magnet
  • A kind of preparation method of suspension liquid plasma spraying coating on the surface of NdFeB magnet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: The rare earth powder is Dy 2 o 3 pink

[0033] 1. Preparation of rare earth suspension: Dy 2 o 3 Mix the powder and deionized water in proportion, stir evenly to obtain a rare earth powder suspension, the solid content of the rare earth powder suspension is 15wt%, after ball milling for 1.5h, the median diameter of the rare earth powder is 0.45 μm, add a dispersant to polymerize Acrylic acid, the amount of dispersant added is Dy 2 o 3 1 wt% of the powder mass, adjust the pH of the suspension to 7-9 to obtain a uniform and stable rare earth suspension, ready for use.

[0034] 2. Double-sided spraying of NdFeB magnets:

[0035] 2.1. The surface of the sintered NdFeB magnet is sequentially degreased, pickled, and vacuum dried. The degreasing adopts ultrasonic cleaning of acetone solution, and the ultrasonic cleaning time is 30 min, and the pickling adopts nitric acid solution with a mass fraction of 4 wt%, and the pickling time is 30 s.

[0036] 2.2....

Embodiment 2

[0043] 1. Preparation of rare earth suspension: Dy 2 o 3 Mix the powder and deionized water in proportion, and stir evenly to obtain a rare earth powder suspension. The solid content of the rare earth powder suspension is 15wt%. After ball milling for 2.5 hours, the median diameter of the rare earth powder is 0.28 μm. Acrylic acid, the amount of the dispersant added is 1wt% of the mass of the rare earth powder, the pH of the suspension is adjusted to 7-9, and a uniform and stable rare earth suspension is obtained, which is ready for use.

[0044] 2. Double-sided spraying of NdFeB magnets:

[0045] 2.1. The surface of the sintered NdFeB magnet is sequentially degreased, pickled, and vacuum dried. The degreasing adopts ultrasonic cleaning of acetone solution, and the ultrasonic cleaning time is 30 min, and the pickling adopts nitric acid solution with a mass fraction of 4 wt%, and the pickling time is 30 s.

[0046] 2.2. Use suspension plasma spraying technology to spray on t...

Embodiment 3

[0053] 1. Preparation of rare earth suspension: mix Tb 2 o 3 The powder and deionized water are mixed in proportion, and stirred evenly to obtain a rare earth powder suspension. The solid content of the rare earth powder suspension is 20wt%. After ball milling for 2.5 hours, the median diameter of the rare earth powder is 0.36 μm. Acrylic acid, the amount of the dispersant added is 1.5wt% of the mass of the rare earth powder, and the pH of the suspension is adjusted to 7-9 to obtain a uniform and stable rare earth suspension, which is ready for use.

[0054] 2. Double-sided spraying of NdFeB magnets:

[0055] 2.1. The surface of the sintered NdFeB magnet is sequentially degreased, pickled, and vacuum dried. The degreasing adopts ultrasonic cleaning of acetone solution, and the ultrasonic cleaning time is 30 min, and the pickling adopts nitric acid solution with a mass fraction of 4 wt%, and the pickling time is 30 s.

[0056] 2.2. Use suspension plasma spraying technology t...

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Abstract

The invention discloses a preparation method of a suspension plasma spray coating on the surface of a NdFeB magnet, comprising the following steps: (1) preparing a rare earth suspension; (2) using the suspension plasma spraying technology to spray the two sides of the NdFeB magnet , to obtain a suspension plasma spray coating; (3) The magnet after spraying is treated by grain boundary thermal diffusion method. Plasma spraying technology combined with grain boundary thermal diffusion technology has the characteristics of high production efficiency and environmental friendliness, which can effectively increase the diffusion depth of heavy rare earth elements in magnets, promote the improvement of magnetic properties, and also help accelerate the industry of grain boundary diffusion technology. process.

Description

technical field [0001] The invention relates to the technical field of NdFeB magnets. Specifically, it is a preparation method for plasma spraying coating of a suspension liquid on the surface of an NdFeB magnet. Background technique [0002] NdFeB magnets have been widely used in electronic information, metallurgical industry, medical and health fields due to their excellent magnetic properties such as high energy product and high coercive force. However, in order to further expand the application range of NdFeB magnets, the market has put forward higher requirements for the magnetic properties of NdFeB magnets. At present, the method to improve the magnetic properties of sintered NdFeB magnets is mainly the grain boundary diffusion method, that is, the compound containing heavy rare earth elements is coated on the surface of sintered NdFeB magnets, and then thermal diffusion treatment is performed to make the heavy rare earth elements along the grain boundaries Diffusion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/04C23C4/02C23C4/18H01F41/02
CPCC23C4/02C23C4/04C23C4/18C23C4/11C23C4/134H01F41/0293
Inventor 白玉高元明马文尹雪王誉娄树普辛博陈伟东
Owner INNER MONGOLIA UNIV OF TECH
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