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Preparation method of samarium-iron-nitrogen series permanent magnet material

A permanent magnet material, samarium-iron-nitride technology, applied in the direction of magnetic materials, metal material coating technology, magnetic objects, etc., can solve the problems of hindered industrial production, uneven nitriding, long nitriding cycle, etc., to achieve the suppression of sub- The formation of stable phase, lower crystallization annealing temperature, and fast nitriding speed

Active Publication Date: 2018-01-09
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Effect test

preparation example Construction

[0013] The preparation method of this samarium-iron-nitrogen permanent magnet material includes SPD treatment, nitriding treatment and annealing crystallization treatment process, and the technology of each treatment process is as follows:

[0014] (1) SPD treatment: the metastable samarium-iron alloy is subjected to large plastic deformation, and the true strain ε t 5 to 8, the deformation metastable state (partial metastable state) samarium iron alloy is obtained, and its pre-proportioned composition is Sm 2 Fe 17±x ; The metastable samarium-iron alloy is all metastable samarium-iron alloys, or part of the metastable samarium-iron alloys whose proportion of metastable structure is not less than 60%; it is best to use high-pressure torsion method, torsion temperature T≤100 ℃, the torsional pressure is 4~5.5GPa.

[0015] The large plastic deformation method (Severe Plastic Deformation, SPD) is a technology for preparing massive ultra-fine-grained materials through mechanical...

Embodiment 1

[0018] Embodiment 1: The preparation method of this samarium-iron-nitrogen permanent magnet material adopts the following specific process.

[0019] Set the provisioning component to Sm 2 Fe 17 All of the metastable samarium-iron alloy thin strips are put into high-pressure torsion equipment for large plastic deformation treatment. The alloy thin strip is placed in a high-temperature nitriding furnace, the nitriding temperature of the high-temperature nitriding furnace is 350°C, and the nitriding atmosphere is high-purity nitrogen N 2 , the atmospheric pressure is 0.6MPa, and the holding time is 2.5h. Alloy thin strips are placed in a vacuum annealing furnace at 620°C and a vacuum of 5*10 -3 Annealing 10h under Pa condition, can get Sm 2 Fe 17 N 3 permanent magnet material. The coercivity Hc of the permanent magnet material obtained in this embodiment is 40kOe, and the maximum magnetic energy product (BH) max=14MGOe.

Embodiment 2

[0020] Embodiment 2: The preparation method of this samarium-iron-nitrogen permanent magnet material adopts the following specific process.

[0021] Set the provisioning component to Sm 2 Fe 17 The 90% metastable samarium-iron alloy thin strip is put into high-pressure torsion equipment for large plastic deformation treatment. The final alloy thin strip is placed in a high-temperature nitriding furnace, the nitriding temperature of the high-temperature nitriding furnace is 330°C, and the nitriding atmosphere is high-purity nitrogen N 2 +NH 3 , the atmospheric pressure is 0.6MPa, and the holding time is 2.8h. Alloy thin strips are placed in a vacuum annealing furnace at 600°C and a vacuum of 8*10 -3 Annealing 9h under Pa condition, can get Sm 2 Fe 17 N 3 permanent magnet material. The coercivity Hc of the permanent magnet material obtained in this embodiment is 45kOe, and the maximum magnetic energy product (BH) max is 17MGOe.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C21D1/26C21D1/773C23C8/26H01F1/053
Inventor 王书桓柳昆冯运莉赵定国宋春燕王黎光
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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