A kind of preparation method of samarium-iron-nitrogen permanent magnet material

Abstract

The invention discloses a preparation method of a samarium-iron-nitrogen series permanent magnet material. The method comprises the steps that metastable state samarium-iron alloy is subjected to severe plastic deformation and then is subjected to nitrogen treatment and annealing crystallization treatment, and therefore the samarium-iron-nitrogen series permanent magnet material can be obtained. In the method, when the deformed samarium-iron-nitrogen series permanent magnet material is subjected to nitrogen treatment, since the free volume 'defect' content in the metastable state alloy can beincreased through multiple shear bands produced in the severe plastic deformation process, entering and diffusion of nitrogen atoms are facilitated, and the nitriding amount and nitriding uniformity of the alloy can be remarkably improved; since the multiple shear bands are produced through the severe plastic deformation, the follow-up crystallization annealing temperature can also be reduced, andnitride is reduced or prevented from being produced; and generation of the metastable phase is restrained, grains are refined, and coercive force is improved. By means of the method, the nitriding speed can be improved, the nitriding temperature can be reduced, decomposition of a samarium-iron-nitrogen compound is restrained, the microstructure is refined, and the nitriding efficiency of samarium-iron alloy for preparing the samarium-iron-nitrogen magnetic material is improved.

Description

technical field [0001] The invention relates to a preparation method of a permanent magnet material, in particular to a preparation method of a samarium-iron-nitrogen permanent magnet material. Background technique [0002] After three generations of development, rare earth permanent magnet materials have been widely used in the fields of machinery, electronics, instrumentation and medical treatment. With the development trend of strong magnetism and miniaturization of devices, SmFeN magnets have avoided the third generation of rare earth permanent magnet materials— NdFeB has weak physical properties such as low Curie temperature and easy oxidation, and has become a research hotspot for a new generation of rare earth permanent magnet materials. The introduction of interstitial nitrogen atoms is the key reason for the excellent magnetic properties of samarium iron nitrogen compounds, so the nitriding process plays a vital role in the preparation of samarium iron nitrogen magn...

AI Technical Summary

Problems solved by technology

The above treatment is still the nitriding treatment of crystalline samarium-iron alloy, the nitriding cycle is long, the nitriding efficiency is low, the nitriding is uneven, and the industrial production is hindered