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

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...

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.

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