Research on Heat Treatment Technology and Wave Absorption Property of Flake Carbonyl Iron Powder
YUAN Jianghang1, QU Zhaoming1, ZHAO Fang2, XU Baocai3, SUN Xiaoning1, WANG Qingguo1,*
1 National Key Laboratory on Electromagnetic Enviroment Effects, Army Engineering University, Shijiazhuang Campus, Shijiazhuang 050003, China 2 Department of Vehicle and Electrical Engineering, Army Engineering University, Shijiazhuang Campus, Shijiazhuang 050003, China 3 Department of Materials Engineering, Hebei Vocational University of Industry and Technology, Shijiazhuang 050091, China
Abstract: The original carbonyl iron powder with the particle size of 3—5 μm was used as the raw material to prepare absorbing materials. After ball mil-ling and heat treatment of carbonyl iron powder, the flake shape modified absorbent was prepared. The electromagnetic parameters were analyzed and the effects of heat treatment temperature and coating thickness on its absorbing performance were predicted by simulation. Scanning electron microscopy (SEM), X-ray diffraction (XRD), vibration sample magnetometer (VSM) and vector network analyzer were used to characterize the micromorphology, phase state, static magnetic properties and electromagnetic parameters of the samples at each stage. The effects of ball milling and heat treatment on the wave absorption properties of carbonyl iron powder were investigated. The results show that the morphology of carbonyl iron powder can be processed as flake shape by ball milling, and the microstructure of carbonyl iron powder has no changes after heat treatment at the temperatures lower than 400 ℃. The ball milling process decreases the crystallinity of the original carbonyl iron powder and increases its coercoerity, while the heat treatment process may increase the crystallinity of the iron powder and reduce its coercoerity. Both ball milling and heat treatment can make the lowest reflectivity of carbonyl iron powder move to lower frequency. After 3 h ball milling and heat treatment at temperature 400 ℃, the sample has the best wave absorption performance. The effective absorbing bandwidth of the material with a thickness of 2 mm ranges from 5.11 GHz to 11.36 GHz, and the effective absorbing bandwidth of the material with a thickness of 3 mm ranges from 2.45 GHz to 6.84 GHz, which shows excellent absorbing performance in the S-band and C-band.
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2022, Vol. 36 
