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Preparation method of high magnetic permeability wave-absorbing material

A technology of wave-absorbing materials and high magnetic permeability, which is applied in the field of wave-absorbing materials, can solve the problems of uniformity in proportion reduction, and achieve the effects of reducing ball milling time, improving eddy current loss, and high magnetic permeability

Active Publication Date: 2019-08-13
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the proportion reduction and uniformity of the powder after flattening have not been resolved.

Method used

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  • Preparation method of high magnetic permeability wave-absorbing material
  • Preparation method of high magnetic permeability wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Put the following raw materials Fe 86%, Si8%, and Al 6% into an intermediate frequency vacuum induction furnace with alumina as a crucible for smelting, and vacuumize to 10 -3 Pa, filled with high-purity argon until the pressure in the furnace is 5*10 4 Pa, use high power until the charge melts, then refine with low power for 5 minutes.

[0032] (2) Put the smelted FeSiAl master alloy into the crucible, wherein the diameter of the crucible nozzle is 0.5mm, the injection pressure is 4000Pa, and the vacuum is 5*10 -3 Pa, the alloy ingot is remelted by an induction coil under the protection of high-purity argon, and then is quickly sprayed onto a high-speed rotating roller to obtain a rapidly solidified sheet with a rapid quenching rate of 22m / s. At the same time, the flakes are pre-broken to less than 1mm.

[0033] (3) The pre-broken alloy powder is ball milled for 10 hours, the temperature in the ball mill cavity is 200°C, the ball-to-material ratio is 5:1, and the...

Embodiment 2

[0036] (1) Put the following raw materials Fe 90%, Si6%, and Al 4% into an intermediate frequency vacuum induction furnace with alumina as a crucible for smelting, and vacuumize to 10 -3 Pa, filled with high-purity argon until the pressure in the furnace is 5*10 4 Pa, use high power until the charge melts, then refine with low power for 5 minutes.

[0037] (2) Put the smelted FeSiAl master alloy into the crucible, wherein the diameter of the crucible nozzle is 0.5mm, the injection pressure is 3500Pa, and the vacuum is 5*10 -3 Pa, alloy ingots are remelted by induction coils under the protection of high-purity argon, and then quickly sprayed onto high-speed rotating rollers to obtain rapidly solidified flakes, with a rapid quenching rate of 26m / s. At the same time, the flakes are pre-broken to less than 1mm.

[0038] (3) The pre-crushed alloy powder is subjected to high-temperature ball milling for 10 hours. The temperature in the chamber of the ball mill is 300°C, the ball-...

Embodiment 3

[0041] (1) Put the following raw materials Fe 92%, Si5%, and Al 3% into an intermediate frequency vacuum induction furnace with alumina as a crucible for smelting, and vacuumize to 10 -3 Pa, filled with high-purity argon until the pressure in the furnace is 5*10 4 Pa, use high power until the charge melts, then refine with low power for 5 minutes.

[0042] (2) Atomize the above alloy melt into alloy powder through an ultra-high pressure water atomization powder making device.

[0043] (3) The pre-crushed alloy powder is subjected to high-temperature ball milling for 10 hours. The temperature inside the ball mill cavity is 400°C, the ball-to-material ratio is 5:1, and the rotation speed is 400r / min;

[0044] (4) Add a binder to the alloy powder after ball milling, the amount of the binder is 0.9% of the weight of the FeSiAl alloy powder, press the above material into shape, the mixing pressure is 30kN, annealing treatment at 150°C for 10min, and the target product is obtained...

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Abstract

The invention discloses a preparation method for a wave absorbing material with high magnetic conductivity. The method comprises the steps that (1) iron-base alloy powder is prepared; (2) the iron-base alloy power is treated by mixing and ball milling, so flat wave absorbing powder is obtained; and (3) a binder is added into the flat wave absorbing powder for mixing, and a target product is obtained after compression shaping, wherein the treatment of stirring and ball milling is conducted under a temperature field. By the method, ball milling efficiency can be increased effectively; an annealing step after the ball milling is simplified; surface roughness of the alloy powder is improved; finally, evenness of the shaped flat wave absorbing powder and stability of electromagnetic performance of the wave absorbing material are ensured; and the method is applicable to large-scale industrialization.

Description

technical field [0001] The invention belongs to the field of wave-absorbing materials, and relates to a method for preparing a high-permeability wave-absorbing material, in particular to a method for preparing a metal soft magnetic wave-absorbing material. Background technique [0002] Electromagnetic interference (EMI) is the interference of effective electromagnetic signals by unwanted electromagnetic signals or noise generated by electronic equipment such as computers and mobile phones during use. With the increasing popularity of various electronic devices, mobile communications, and office automation, electromagnetic interference has increasingly become a major environmental pollution that people worry about. [0003] At present, the main researched anti-EMI absorbing materials are ferrite series and metal soft magnetic series. The various preparation processes of ferrite series anti-EMI materials are very mature, and they occupy a dominant position in the field of anti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/147B22F9/04
CPCB22F9/04B22F2009/043H01F1/14741
Inventor 罗阳谢佳君彭海军孙亮于敦波卢硕刘伟
Owner GRIREM ADVANCED MATERIALS CO LTD
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