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Method for nitridation and crystallization of metastable-state samarium-iron alloy

A samarium-iron alloy and metastable technology, which is applied in the field of nitridation and crystallization of metastable samarium-iron alloys, can solve problems such as unreported, and achieve the effects of improving nitriding efficiency, refining microstructure and uniform distribution of nitrogen atoms

Active Publication Date: 2017-07-18
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there is no report on the direct nitriding treatment of metastable samarium-iron alloys to prepare nitrogen-containing samarium-iron alloy permanent magnet materials.

Method used

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  • Method for nitridation and crystallization of metastable-state samarium-iron alloy
  • Method for nitridation and crystallization of metastable-state samarium-iron alloy
  • Method for nitridation and crystallization of metastable-state samarium-iron alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Set the provisioning component to Sm 2 Fe 17 The molten samarium-iron alloy solution is rapidly cooled and quenched by mold cooling technology to prepare amorphous samarium-iron alloy strips, and then the alloy strips are placed in a high-temperature nitriding furnace, and the nitriding temperature of the high-temperature nitriding furnace is controlled to 450°C, the nitriding atmosphere is high-purity nitrogen N 2 , the atmosphere pressure is 0.1MPa, the holding time is 5h, the alloy thin strip is fully nitrided and preliminary crystallized, the alloy thin strip after nitriding is put into a vacuum annealing furnace, fully crystallized and annealed at 530°C, Sm 2 Fe 17 N x permanent magnet material.

[0023] to the Sm 2 Fe 17 N x Permanent magnet materials are analyzed, the results can be found in figure 1 and figure 2 , figure 1 It is the X-ray diffraction pattern of the amorphous SmFe alloy thin strip obtained in Example 1 after nitriding, and Fig. 2 is t...

Embodiment 2

[0025] Set the provisioning component to Sm 2 Fe 17 The molten samarium-iron alloy solution is rapidly cooled and quenched by mold cooling technology to prepare amorphous samarium-iron alloy strips, and then the alloy strips are placed in a high-temperature nitriding furnace, and the nitriding temperature of the high-temperature nitriding furnace is controlled to 400°C, the nitriding atmosphere is high-purity nitrogen N 2 with NH 3 Mixed gas, the atmosphere pressure is 0.7MPa, and the holding time is 3h, the alloy strip is fully nitrided and preliminary crystallized, and the nitrided alloy strip is then placed in a vacuum annealing furnace, fully crystallized and crystallized at 500°C Annealed, the prepared Sm 2 Fe 17 N x permanent magnet material.

[0026] to the Sm 2 Fe 17 N x The permanent magnet material was analyzed, and the results showed that Sm 2 Fe 17 The diffraction peaks shifted to the low angle by 1~2°, and the nitrogen atoms penetrated into the Sm 2 Fe...

Embodiment 3

[0028] Set the provisioning component to Sm 2 Fe 17 The molten samarium-iron alloy liquid is rapidly cooled and condensed by atomization technology to prepare amorphous samarium-iron alloy powder, and then the alloy powder is put into a high-temperature nitriding furnace, and the nitriding temperature of the high-temperature nitriding furnace is controlled to 350°C, the nitriding atmosphere is high-purity nitrogen N 2, the atmosphere pressure is 0.4MPa, the holding time is 4h, the alloy powder is fully nitrided and preliminary crystallized, the alloy powder after nitriding is put into a vacuum annealing furnace, fully crystallized and annealed at 550 ° C, Sm 2 Fe 17 N x permanent magnet material.

[0029] Carry out thermal analysis to described amorphous samarium-iron alloy powder, the result sees image 3 , image 3 It is the TG-DSC curve that embodiment 3 obtains samarium-iron alloy in argon atmosphere. Depend on image 3 It can be seen that the exothermic peak betw...

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Abstract

The invention provides a method for nitridation and crystallization of metastable-state samarium-iron alloy. The method comprises the steps of performing rapid cooling and sudden condensation on molten-state samarium-iron alloy to obtain the metastable-state samarium-iron alloy; performing nitridation and initial crystallization on the metastable-state samarium-iron alloy to obtain nitrided samarium-iron alloy; and performing annealing and crystallization on the nitrided samarium-iron alloy to obtain a samarium-iron nitrogen permanent-magnet material. During nitridation of a metastable-state material, a large amount of rheological units existing in the metastable-state alloy are beneficial for diffusion and homogenization of nitrogen atoms, the nitridation content of the alloy can be remarkably increased, and the nitrogen atoms are uniformly distributed; crystallization is completed before decomposition of Sm<2>Fe<17>N<x>, nitride formation is reduced or prevented, and the metastable-state samarium-iron alloy has a refined microstructure; and moreover, according to the method provided by the invention, the nitridation speed is fast, and the nitridation efficiency of improving a samarium-iron nitrogen magnetic material by the samarium-iron alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a method for nitriding and crystallizing a metastable samarium-iron alloy. Background technique [0002] Rare earth permanent magnet materials have undergone three generations of development. With the development trend of device miniaturization, SmFeN magnets have avoided some weaknesses in the physical properties of the third generation rare earth permanent magnet materials - NdFeB, and become a new generation of rare earth permanent magnets. Materials research hotspots. The introduction of nitrogen atoms makes samarium iron nitrogen compounds have excellent magnetic properties, so nitriding treatment plays a vital role in the preparation of samarium iron nitrogen magnets. The process of nitriding treatment in the traditional SmFeN permanent magnet preparation process is basically the same, after crystallization treatment of SmFe alloy, it has a stable Th...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F41/02C21D1/26C21D1/773C23C8/26
CPCC21D1/26C21D1/773C23C8/26H01F1/147H01F41/0253
Inventor 王书桓赵定国宋春燕张凯旋柳昆
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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