Grain Size Modulation to Optimize the Wave-Absorbing Properties of Fesicr Alloy Micropower

Abstract

In this paper, ball-milled flake FeSiCr alloy is subjected to vacuum annealing temperature at 300-500 °C. The results show that the appropriate heat treatment temperature increase the average grain size of the material, eliminate defects and internal stresses, and improve the complex permeability of the material. The optimum wave-absorbing performance of the material is achieved when the heat treatment temperature is 400 °C with the minimum reflectivity RLmin reaching -56.33 dB at the frequency f= 3.97 GHz, corresponding to the thickness of the wave-absorbing coating d=4.0 mm. This work provides an important reference value for the application of the FeSi-based alloy micropowder soft magnetic material in the field of microwave absorption.

Keywords: FeSiCr powder, vacuum annealing, grain size, wave absorbing properties