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A kind of flat iron nitride magnetic powder and its preparation method

A flattening, iron powder technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve problems such as reducing the magnetization of the system

Active Publication Date: 2018-01-30
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

But a new problem has emerged, aluminum oxide and silicon oxide are non-magnetic components, which reduces the magnetization of the system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The steps are:

[0037] 1) Material preparation

[0038] Choose atomized iron powder with an average particle size of 2 μm as the raw material;

[0039] 2) Flattening by ball milling

[0040] Put the iron powder into the ball mill tank, select the ball-to-material ratio as 5:1, select n-hexane as the medium, control the speed of the ball mill to 300r / min, and control the ball milling time to 10h to obtain flake iron powder with good flattening effect;

[0041] 3) oxidation

[0042] Take out the flattened iron powder, place it in a heat treatment furnace, and pass O at a constant rate 2 , oxidized at 300°C for 10 hours to obtain flattened iron oxide;

[0043] 4) restore

[0044] Introduce hydrogen and reduce at 300°C for 20 hours to regain flattened iron powder;

[0045] 5) Nitriding

[0046] Introduce ammonia gas, nitriding at 120°C for 30h; lower the temperature, cool to room temperature with the furnace, and take out the sample.

[0047] The sample prepared in...

Embodiment 2

[0049] The steps are:

[0050] 1) Material preparation

[0051] Select hydroxyl iron powder with an average particle size of 10 μm as the raw material;

[0052] 2) Flattening by ball milling

[0053] Put the iron powder into the ball mill tank, select the ball-to-material ratio as 10:1, choose anhydrous ethanol as the medium, control the speed of the ball mill to 400r / min, and control the ball mill time to 6h to obtain flake iron powder with good flattening effect;

[0054] 3) oxidation

[0055] Take out the flattened iron powder, place it in a heat treatment furnace, and pass O at a constant rate 2 , oxidized at 320°C for 8 hours to obtain flattened iron oxide;

[0056] 4) restore

[0057]Introduce hydrogen and reduce at 320°C for 16 hours to regain flattened iron powder;

[0058] 5) Nitriding

[0059] Introduce ammonia gas, nitriding at 140°C for 15h; lower the temperature, cool to room temperature with the furnace, and take out the sample.

[0060] The sample prepar...

Embodiment 3

[0062] The steps are:

[0063] 1) Material preparation

[0064] Choose reduced iron powder with an average particle size of 40 μm as the raw material;

[0065] 2) Flattening by ball milling

[0066] Put the iron powder into the ball mill tank, select the ball-to-material ratio as 15:1, choose anhydrous ethanol as the medium, control the speed of the ball mill to 500r / min, and control the ball mill time to 2h to obtain flake iron powder with good flattening effect;

[0067] 3) oxidation

[0068] Take out the flattened iron powder, place it in a heat treatment furnace, and pass O at a constant rate 2 , oxidized at 340°C for 6h to obtain flattened iron oxide;

[0069] 4) restore

[0070] Introduce hydrogen and reduce at 340°C for 12 hours to regain flattened iron powder;

[0071] 5) Nitriding

[0072] Introduce ammonia gas, nitriding at 160°C for 6h; lower the temperature, cool to room temperature with the furnace, and take out the sample.

[0073] The sample prepared in ...

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Abstract

The invention relates to a flat iron nitride magnetic powder and a preparation method thereof. The invention adopts the method of wet ball milling, uses n-hexane or absolute ethanol as the medium, selects the ball material ratio as 5:1~20:1, controls the speed of the ball mill to 300~600r / min, and controls the ball milling time to 0.1~10h. Obtain flaky iron powder with good flattening effect; then pass through O2, oxidize at 300~400°C for 1‑10h to obtain flattened iron oxide; pass through hydrogen, reduce at 300~400°C for 4‑20h, and regain flattening Iron powder; pass through ammonia gas, nitriding at 120~200℃ for 1~30h. By flattening the iron powder, the method effectively increases the surface area of ​​the iron powder per unit volume, which is beneficial to nitriding; at the same time, the iron powder after ball milling has larger internal stress and more defects, which is also beneficial to the penetration of nitrogen.

Description

technical field [0001] The invention relates to a flat iron nitride magnetic powder and a preparation method thereof, belonging to the field of material preparation. Background technique [0002] With the advancement of science and technology, the development of society, and the acceleration of people's life rhythm, information has attracted more and more people's attention, and the information age has come. The development of information carrier materials has become a hot topic, and information recording, especially magnetic recording, is closely related to people's production and life. Magnetic recording technology products, such as tapes, disks, and magnetic drums, have been widely used by people. Fe-N thin films have attracted people's attention because of their high saturation magnetization, low coercive force, high magnetic permeability, wear resistance and corrosion resistance, and high application value. [0003] With the change of nitrogen content, iron nitride ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/03B22F1/00B22F9/04
CPCH01F1/0311B22F9/04B22F2009/043B22F1/068
Inventor 彭晓领杨艳婷李静王攀峰徐靖才金红晓洪波金顶峰王新庆葛洪良
Owner 东阳市顶峰磁材有限公司
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