Preparation method of neodymium-iron-boron powder

Abstract

The invention discloses a preparation method of neodymium-iron-boron powder. The preparation method comprises the following steps that a, pretreatment is conducted, raw materials are conducted pretreatment of weighing, crushing, material cutting, rust removing and the like; b, smelting is conducted, the raw materials of praseodymium, pure iron and ferroboron in the step a are burdened according toa ratio, and melt spinning is conducted after high-temperature smelting is conducted; c, hydrogen explosion is conducted, the material in the step b is placed in a hydrogen crushing furnace, hydrogengas enters an alloy along a thin layer of neodymium-rich phase, and the alloy is expanded and burst to be broken; and d, powder preparation is conducted, the material obtained in the step c is crushed into powder, and the powder is stored in a neodymium-iron-boron storage device. According to the preparation method, the oxidation reaction is carried out on a copper net, so that the oxygen consumption is achieved, the deoxygenization is thorough, and residual oxygen in a tank body is prevented from causing oxidation of the neodymium-iron-boron powder; and nitrogen gas can be circulated in thetank body, so that the consumption of the nitrogen gas can be reduced, the waste of the nitrogen gas can be avoided, and the nitrogen gas can be prevented from being brought out of harmful impuritiesin the tank body.

Description

technical field [0001] The invention belongs to the field of NdFeB permanent magnets, in particular to a preparation method of NdFeB powder. Background technique [0002] In the process of processing, NdFeB magnets need to be ground into powder first, and then pressed into shape, and the powder NdFeB magnets contain a large amount of rare metals, so they are easy to oxidize in the air, or spontaneously ignite, so the powder form The magnet needs to be stored in the bottle and flushed with an inert gas for preservation, such as helium. [0003] However, the existing powder magnet storage device releases the oxygen in the device by rushing into nitrogen, and a large amount of nitrogen is needed to discharge most of the oxygen in the device, and the discharged nitrogen cannot be recovered in time and is discharged into the air, which contains Many harmful impurities lead to air pollution. Contents of the invention [0004] In order to overcome the deficiencies of the prior ...

AI Technical Summary

Problems solved by technology

[0003] However, the existing powder magnet storage device releases the oxygen in the device by rushing into nitrogen, and a large amount of nitrogen is needed to discharge most of the oxygen in the device, and the discharged nitrogen cannot be recovered in time and is discharged into the air, which contains A lot of harmful impurities, leading to air pollution

Images