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Iron base nanocrystal magnetically soft alloy micropowder electromagnetic wave absorbing agent and preparation method thereof

A technology of iron-based nanocrystals and soft magnetic alloys, applied in the fields of magnetic/electric field shielding, electrical components, etc., can solve problems such as low equipment requirements, complex processes, and poor particle size uniformity of powders, and achieve saturation magnetization and magnetic High conductivity, excellent high-frequency absorbing performance, and simple preparation process

Active Publication Date: 2019-05-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The atomization method can produce a large amount of alloy powder at one time, but the particle size uniformity of the powder is poor; the strip crushing method generally first obtains amorphous alloy strips through the melt rapid quenching method (strip method), and then passes through Heat treatment and crushing to obtain nanocrystalline powder
The above two methods not only require the alloy to have a sufficiently high amorphous forming ability, but also have high requirements for equipment, and the process is relatively complicated.
Mechanical alloying by high-energy ball milling can directly prepare nanocrystalline soft magnetic alloy powder. This method has relatively low requirements on the alloy's amorphous formation ability, and can obtain amorphous / nanocrystalline structures in a wider alloy composition range. The requirements for equipment are also low, the operation is simple, and alloy powder can be produced in large quantities. The disadvantage is that it takes a long time to directly produce nanocrystalline powder by mechanical alloying, and the production efficiency is low.

Method used

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  • Iron base nanocrystal magnetically soft alloy micropowder electromagnetic wave absorbing agent and preparation method thereof
  • Iron base nanocrystal magnetically soft alloy micropowder electromagnetic wave absorbing agent and preparation method thereof
  • Iron base nanocrystal magnetically soft alloy micropowder electromagnetic wave absorbing agent and preparation method thereof

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preparation example Construction

[0042] The present invention also provides a method for preparing an iron-based nanocrystalline soft magnetic alloy powder electromagnetic wave absorber. The preparation of the alloy powder includes the following steps:

[0043] Step 1: preparation of raw materials for preparing alloy micropowder;

[0044] Step 2: preparation of nanocrystalline alloy powder;

[0045] The raw materials for preparing alloy micropowder with a diameter of less than 300 μm are selected and put into a ball mill tank, vacuumized and then filled with inert gas for protection, and ball milled to obtain alloy micropowder.

[0046] Further, the preparation process of step 1 includes: weighing the powder raw materials of each component to prepare an alloy according to the nominal composition of the alloy powder, and melting each component in an inert gas atmosphere by using an induction melting furnace or a non-consumable electric arc furnace The powder raw material is obtained to obtain a chemically uni...

Embodiment 1

[0053] Fe 80.7 Si 4 B 13 Cu 2.3

[0054] (1) Preparation of as-cast master alloy ingot

[0055] Fe, Si, B and Cu raw materials with a purity of not less than 99% (mass percentage) are weighed and proportioned according to the nominal composition of the alloy, and the alloy raw materials are repeatedly smelted three times in an argon atmosphere in a non-consumable electric arc furnace to obtain Master alloy ingot with uniform composition.

[0056] (2) Preparation of nanocrystalline alloy powder

[0057] The master alloy ingot is mechanically pre-crushed and passed through a 60-mesh sieve, and the alloy powder with a particle size of less than 300 μm is put into a ball mill. -3 Pa, filled with argon gas as a protective gas, put it into a planetary ball mill for ball milling after sealing, control the speed of the ball mill to 350rpm, stop for 5 minutes for cooling every 30min, and set the ball milling time to 40h, 80h, 120h respectively to reach the set ball milling time ...

Embodiment 2

[0069] Fe 89 Si7 B 3 Cu 1

[0070] (1) Preparation of as-cast master alloy ingot

[0071] This step is with embodiment 1.

[0072] (2) Preparation of nanocrystalline alloy powder

[0073] This step is with embodiment 1. The difference between this embodiment and embodiment 1 is that the ball milling time is set to 60h and 90h respectively, and no heat treatment is required.

[0074] (3) Structural characterization, morphology observation and performance testing of iron-based nanocrystalline alloy electromagnetic wave absorbers

[0075] This step is with embodiment 1.

[0076] The alloy powders obtained after ball milling for different times all have nanocrystalline / amorphous mixed structure, and the grain size of the bcc-Fe phase is about 12nm; The micropowder has typical soft magnetic properties, and the saturation magnetization is in the range of 192.6-196.0emu / g; the μ' of the alloy micropowder / paraffin composite sample is 2.25-2.40 at 2GHz, and the maximum value of...

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Abstract

The invention provides an iron base nanocrystal magnetically soft alloy micropowder electromagnetic wave absorbing agent. The component expression of alloy micropowder is FeaSibBcCudMe, wherein M is one or several of Al, Cr, Co, Ni, P and C elements; a, b, c, d and e respectively represent the atomic percent contents of corresponding components; a is not more than 90 and not less than 80; b is notmore than 15 and not less than 1; c is not more than 15 and not less than 3; d is not more than 2.5 and not less than 0; and e is not more than 5 and not less than 0. The invention further provides apreparation method of the iron base nanocrystal magnetically soft alloy micropowder electromagnetic wave absorbing agent; and the preparation method comprises the following steps: (1) preparation ofraw materials for preparing alloy micropowder; and (2) preparation of nanocrystal alloy micropowder: the raw materials for preparing the alloy micropowder with diameters being less than 300 microns are selected to fill in a ball milling tank, inert gas is injected after vacuumizing for protection, and the alloy micropowder is prepared through ball milling. The iron base nanocrystal magnetically soft alloy micropowder electromagnetic wave absorbing agent and the preparation method thereof solve the defects in a traditional electromagnetic wave absorbing agent and a preparation method thereof.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to an iron-based nanocrystalline soft magnetic alloy micropowder electromagnetic wave absorber and a preparation method thereof. Background technique [0002] In recent years, the technology of the electronic information industry has been continuously improved, and modern electronic equipment is developing in the direction of miniaturization, integration and high frequency. With the rise of a new generation of wireless communication, wireless charging technology, and advances in radar detection technology, high-frequency electromagnetic waves (such as frequencies in the GHz range) are increasingly used in industrial, medical, and military fields. The increase in frequency and energy of electromagnetic waves has led to serious electromagnetic interference, electromagnetic pollution, and electromagnetic information leakage. In addition to affecting the normal operation of equipm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04C22C38/02C22C38/32C22C38/16C22C38/06C22C38/10C22C38/08C22C38/20C22C38/30C22C38/34C22C38/42C22C38/52C22C38/54C22C45/02H05K9/00
Inventor 李艳辉张伟张春旋
Owner DALIAN UNIV OF TECH
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