Method for preparing iron nitride magnetic powder through low-temperature plasma nitriding

A plasma nitriding and ferromagnetic nitride technology, applied in magnetic materials, magnetic objects, metal processing equipment, etc., can solve the problems of non-repeatability, identicalness, difficulty, etc., to improve the nitriding efficiency and solve the problem of ammonia decomposition inefficient effects

Active Publication Date: 2016-11-09
东阳市顶峰磁材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to α"-Fe 16 N 2 The phase is a metastable phase at room temperature, and its formation area is very narrow, so it is necessary to prepare α"-Fe 16 N 2 is a very difficult thing, and the preparation of α"-Fe 16 N 2 The experiments are basically not repeatable, and the results of each experiment cannot be exactly the same

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The steps are:

[0031] 1) Material preparation

[0032] Choose atomized iron powder with an average particle size of 2 μm as the raw material;

[0033] 2) oxidation

[0034] Put the iron powder in the heat treatment furnace, pass O at a constant rate 2 , oxidized at 300°C for 10 hours to obtain iron oxide powder;

[0035] 3) restore

[0036] Introduce hydrogen and reduce at 300°C for 20 hours to regain iron powder;

[0037] 4) Low temperature plasma nitriding

[0038] Low-temperature plasma nitriding, control the temperature at 120°C, nitriding for 30h; lower the temperature, cool to room temperature with the furnace, and take out the sample.

[0039] The sample prepared in Example 1 was characterized by XRD, and α"-Fe was detected 16 N 2 Mutually.

Embodiment 2

[0041] The steps are:

[0042] 1) Material preparation

[0043] Select hydroxyl iron powder with an average particle size of 4 μm as the raw material;

[0044] 2) oxidation

[0045] Put the iron powder in the heat treatment furnace, pass O at a constant rate 2 , oxidized at 320°C for 8 hours to obtain iron oxide powder;

[0046] 3) restore

[0047] Introduce hydrogen and reduce at 320°C for 15 hours to regain iron powder;

[0048] 4) Low temperature plasma nitriding

[0049] Low-temperature plasma nitriding, control the temperature at 140°C, nitriding for 20h; lower the temperature, cool to room temperature with the furnace, and take out the sample.

[0050] The sample prepared in embodiment 2 was characterized by XRD, and α"-Fe was detected 16 N 2 Mutually.

Embodiment 3

[0052] The steps are:

[0053] 1) Material preparation

[0054] Select hydroxyl iron powder with an average particle size of 10 μm as the raw material;

[0055] 2) oxidation

[0056] Put the iron powder in the heat treatment furnace, pass O at a constant rate 2 , oxidized at 340°C for 6h to obtain iron oxide powder;

[0057] 3) restore

[0058] Introduce hydrogen and reduce at 340°C for 10 hours to regain iron powder;

[0059] 4) Low temperature plasma nitriding

[0060] Low-temperature plasma nitriding, control the temperature at 160°C, nitriding for 15 hours; lower the temperature, cool to room temperature with the furnace, and take out the sample.

[0061] The sample prepared in embodiment 3 was characterized by XRD, and α"-Fe was detected 16 N 2 Mutually.

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Abstract

The invention relates to a method for preparing iron nitride magnetic powder through low-temperature plasma nitriding. The method comprises the following steps that atomized iron powder, hydroxy iron powder or reduced iron powder of which the average particle size is 2-80 microns is used as a raw material; O2 is introduced, and the raw material is oxidized for 1-10 h at 300-400 DEG C to obtain ferric oxide powder; hydrogen is introduced, the ferric oxide powder is reduced for 4-20 h at 300-400 DEG C to obtain iron powder; the low-temperature plasma nitriding temperature is controlled to 120-200 DEG C, and the low-temperature plasma nitriding time is 1-30 h; and the nitrided iron powder is cooled to room temperature in a furnace, and a sample is taken out. Low-temperature plasma nitriding is conducted, the bottleneck problem that the ammonia dissolving efficiency in the ammonia nitriding method is low is solved, and the nitriding efficiency is effectively improved.

Description

technical field [0001] The invention relates to a low-temperature plasma nitriding preparation method of iron nitride magnetic powder, which belongs to the field of material preparation. Background technique [0002] The excellent soft magnetic properties, oxidation resistance and wear resistance of Fe-N compounds make them ideal materials for magnetic recording media and magnetic sensing elements, and have attracted people's attention. Fe-N compounds are mainly Fe 3 N,Fe 4 N and α"-Fe 16 N 2 Wait for a few. According to domestic and foreign literature reports, α"-Fe 16 N 2 Its magnetism is the best among iron-nitrogen compounds. Its saturation magnetization reaches 280emu / g, which is higher than that of pure iron. It is the material with the highest saturation magnetization found so far. [0003] Due to α"-Fe 16 N 2 The phase is a metastable phase at room temperature, and its formation area is very narrow, so it is necessary to prepare α"-Fe 16 N 2 is a very diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38C23C8/26B22F1/00B22F9/22H01F1/059
CPCH01F1/059C23C8/26C23C8/38B22F9/22B22F1/145
Inventor 李静彭晓领杨艳婷徐靖才王攀峰金红晓金顶峰洪波王新庆葛洪良
Owner 东阳市顶峰磁材有限公司
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