Method for infiltrating dysprosium of neodymium-iron-boron magnet

Abstract

The invention discloses a method for infiltrating dysprosium of a neodymium-iron-boron magnet. The method comprises the following steps: S1, taking and smashing neodymium-iron-boron sheets, adding dysprosium oxide powder, and carrying out ball-milling refining, compression molding of a green body, sintering and tempering to obtain the neodymium-iron-boron magnet; S2, taking the neodymium-iron-boron magnet to be washed, and carrying out acid pickling, ethyl alcohol cleaning and drying to complete the pretreatment of the neodymium-iron-boron magnet; S3, ultrasonically dissolving dysprosium chloride, terbium chloride and aluminum chloride into ethyl alcohol respectively, and stirring and mixing with sodium polyacrylate, polyurethane and ethyl alcohol to obtain a dysprosium infiltrated solution; S4, adding a part of the dysprosium infiltrated solution into a container, adding the neodymium-iron-boron magnet, then continuously adding the dysprosium infiltrated solution until the liquid level of the dysprosium infiltrated solution is higher than the interface of the neodymium-iron-boron magnet, heating the container, carrying out heat preservation and then ultrasonic treatment, taking out the neodymium-iron-boron magnet for drying, packaging the neodymium-iron-boron magnet with an iron sheet, carrying out vacuum aging treatment, and cooling to room temperature to complete the dysprosium infiltration of the neodymium-iron-boron magnet. According to the method disclosed by the invention, the using amount of dysprosium is small, the comprehensive utilization rate is high, the permeation effect is good, and the treatment cost is low.

Description

technical field [0001] The invention relates to the technical field of magnet processing, in particular to a method for infiltrating dysprosium into a neodymium-iron-boron magnet. Background technique [0002] As a kind of rare earth permanent magnet material, NdFeB has extremely high magnetic energy product and coercive force. At the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, so that the instrument Miniaturization, light weight and thinning of equipment such as instruments, electroacoustic motors, and magnetic separation and magnetization become possible. In order to improve the coercive force of NdFeB magnets, a certain amount of dysprosium or terbium is usually added to NdFeB magnets. However, in the current method of adding dysprosium to NdFeB magnets, the depth of dysprosium penetration is generally shallow, and the amount of dysprosium A large amount of use will not o...

AI Technical Summary

Problems solved by technology

In order to improve the coercive force of NdFeB magnets, a certain amount of dysprosium or terbium is usually added to NdFeB magnets. However, in the current method of adding dysprosium to NdFeB magnets, the depth of dysprosium penetration is generally shallow, and the amount of dysprosium A large amount of use will not only affect the magnetism of NdFeB magnets, but also cause a waste of dysprosium resources and increase the cost of dysprosium penetration of NdFeB magnets