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A kind of preparation method of FeSiCr soft magnetic powder

A technology of soft magnetic powder and iron silicon chromium, applied in the field of soft magnetic alloy powder, can solve the problems of powder bulk density, low tap density, low product compaction density, high powder oxygen content, etc., to improve bulk density and vibration Solid density, good product compaction performance, and low powder oxygen content

Active Publication Date: 2018-06-15
TIZ ADVANCED ALLOY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An object of the present invention is to provide a method for preparing FeSiCr soft magnetic powder, which overcomes the powder bulk density, low tap density and high powder oxygen content in the FeSiCr soft magnetic powder produced by the existing water atomization method. The problem of low product pressing density and low inductance value

Method used

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] This case involves a preparation method of iron silicon chromium soft magnetic powder, the steps are as follows:

[0022] 1) FeSiCr soft magnetic alloy powder raw material is added into the intermediate frequency induction furnace, and the alloy liquid is obtained by atmospheric smelting;

Embodiment 1

[0032] A preparation method of FeSiCr soft magnetic powder, the steps are as follows:

[0033] 1) Add FeSiCr high-purity material into an intermediate frequency induction furnace and smelt in the atmosphere; in this embodiment, the FeSiCr soft magnetic alloy powder raw materials are selected as follows: pure chromium 3.5-6.5%, pure silicon 3.0-6.5%, silicon calcium powder 0.6-0.8%, calcium oxide 1.0-1.5%, the balance is iron;

[0034] During the smelting process, the smelting power is controlled to 80-240KW; the time and order of adding alloy elements are as follows: add an appropriate amount of pure chromium, pure silicon and square iron at the bottom of the furnace, and add pure chromium, pure silicon and the remaining square iron in succession during the melting and cleaning process , and finish adding before chemical cleaning, the temperature of the molten steel is ≥1580-1600°C, reduce the power to 10-30KW and add silicon-calcium powder and calcium oxide to cover the molte...

Embodiment 2

[0040] This embodiment is a comparative example of embodiment 1. The difference between this embodiment and embodiment 1 is that no surfactant solution is added to the atomized water in step 2) in this embodiment, and the same conditions as in embodiment 1 are passed. FeSiCr soft magnetic alloy powders were prepared under the following conditions.

[0041] After testing, the bulk density of the FeSiCr soft magnetic alloy powder is 2.48g / cm 3 , the tap density is 3.9g / cm 3 , the oxygen content is higher than 2000ppm; at 600MPa, the green density of the ring inductor is 6.08g / cm 3 , the inductance Ls is 23.7μH.

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Abstract

The invention discloses a preparation method of iron-silicon-chromium soft magnetic powder. The steps of the preparation method are as follows: 1) adding iron-silicon-chromium soft magnetic alloy powder raw materials into an intermediate frequency induction furnace, and smelting in the atmosphere to obtain alloy liquid; 2) under the condition of nitrogen protection Then, the alloy liquid is sent to the atomization tower. During the feeding process, the two atomization media, ultra-high pressure atomized water and low-pressure vortex gas, act on the alloy liquid at the same time, and the alloy liquid is strongly broken into a large number of small metal melts. drops, and then cools and solidifies into Fe-Si-Cr soft magnetic alloy powder. It can prepare Fe-Si-Cr alloy powder with high bulk density, high tap density, low oxygen content, high inductance value and magnetic permeability. It can be widely used as a raw material for miniature inductors.

Description

technical field [0001] The invention relates to the technical field of soft magnetic alloy powder, in particular to a preparation method of FeSiCr soft magnetic powder. Background technique [0002] Metal soft magnetic alloy powder materials are the most widely used and the largest amount of materials in magnetic materials. Inductance mainly plays the role of filtering, oscillation, delay, trapping, etc. in the circuit, as well as filtering signals, filtering noise, stabilizing current, and suppressing electromagnetic wave interference. Therefore, miniature inductors have become extremely important key components in the high-end electronics manufacturing industry. With the advancement of electronic manufacturing fields such as automation control technology and intelligent terminals, electronic devices are increasingly developing towards miniaturization, high performance, and high speed. This promotes the further development of soft magnetic materials to ultrafine, high mag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08H01F1/147
CPCB22F9/082B22F2009/0832B22F2009/084B22F2999/00H01F1/14766B22F2201/02
Inventor 唐明强王冲赵放乐晨林晨
Owner TIZ ADVANCED ALLOY TECH CO LTD
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