Preparation and absorption properties of FeSiAl/ZnO@YCo composites
PAN Wenqian1, ZHOU Wei2, LI Yang1
1. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China; 2. School of Materials and Environmental Engineering, Changsha University, Changsha 410022, China
Abstract：This study used heterogeneous precipitation and heat treatment methods to coat ZnO on the surface of YCo powder particles, and introduced FeSiAl powders to fabricate FeSiAl/ZnO@YCo composites. The microwave absorption properties and electromagnetic loss mechanisms of various YCo-based composite systems were comparatively investigated. The results reveal that the FeSiAl/ZnO@YCo composites exhibit significantly improved absorption property compared to pristine YCo. At 4.6 GHz, the reflection loss of pure YCo is less than -3.00 dB, while the FeSiAl/ZnO@YCo composites achieve a maximum reflection loss of -16.50 dB with an effective absorption bandwidth of approximately 1.9 GHz, indicating remarkable improvement in low-frequency absorption property. In the high-frequency range, FeSiAl/ZnO@YCo composites maintain excellent property, reaching a reflection loss of -24.80 dB at 16.8 GHz with an effective absorption of 2.1 GHz. The enhanced microwave absorption property of the FeSiAl/ZnO@YCo composites are attributed to multiple loss mechanisms (interfacial polarization, resonance loss, and eddy current loss), along with significantly optimized electromagnetic parameters and attenuation constants.
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2025, Vol. 30 
