Method for preparing FeSiAl-series alloy micro powder electromagnetic absorbent

Abstract

The invention belongs to the technical field of electronic materials, and particularly relates to a method for preparing FeSiAl-series alloy micro powder electromagnetic absorbent. The method includes the steps that FeSiAl-series alloy micro powder is put into a tube furnace, and a protective atmosphere is connected in; and then heat treatment is carried out, and accordingly the electromagnetic absorbent prepared through the method can be obtained. When the electromagnetic absorbent and an auxiliary material are compounded according to the volume ratio of the absorbent to the auxiliary material being 28.5%-35% to be prepared into an electromagnetic wave absorbing material, and the effect that the microwave magnetic conductivity of the material is not lowered can be guaranteed. Meanwhile, the effective dielectric constant of the material is lowered obviously, impedance matching can be better achieved, and the microwave absorbing property is improved. Moreover, the operating method is convenient and easy to implement. Compared with the prior art, cost is reduced, and the method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and relates to the complex magnetic permeability and complex permittivity of an alloy micropowder absorbent used in a microwave band (0.5-18GHz), in particular to a preparation method of a FeSiAl series alloy micropowder electromagnetic absorbent. Background technique [0002] Stealth technology is one of the major military technologies that emerged after World War II. In modern warfare, the electromagnetic environment is becoming more and more complex. As an effective means to improve the stealth ability of weapons and equipment, electromagnetic wave absorbing materials are increasingly valued by various military powers, and related research results are frequently published in newspapers. [0003] Among them, the research on absorbing materials is the basis of stealth technology. Compared with other stealth methods, it has the advantages of convenient use, wide application and low c...

AI Technical Summary

Problems solved by technology

However, the high dielectric coefficient of the alloy powder after flaking in the microwave frequency range (0.5-18 GHz) makes it difficult to achieve impedance matching, which affects the realization of the material's microwave-absorbing performance.

At present, the FeSiAl absorber volume content is 35%, and the auxiliary material is paraffin as the electromagnetic wave absorbing material. In the microwave frequency range of 0.5-18 GHz, the maximum value of the real part of the magnetic permeability μ' max About 3.5, the imaginary peak value μ' m ' ax About 2.8, the maximum value of the real part of the permittivity ε' max Greater than 80, the maximum imaginary part ε' m ' ax Greater than 150, impedance matching is difficult, and it is difficult to achieve microwave absorption performance

In the existing research, for the problem of excessively high dielectric of metal micropowder materials, most of them adopt the method of coating with low dielectric constant materials, the process is relatively complicated, and the magnetic permeability of the material will be reduced.

Images