Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8152747 | Journal of Magnetism and Magnetic Materials | 2018 | 7 Pages |
Abstract
Flake-like Fe@SiC composites were synthesized by a combined approach consisting of ball-milling and heat-assisted surface adhesion processes. The experimental results indicate that the Fe micropowders with an initial size of 30-40â¯Î¼m can be completely milled into a flake-like shape with the diameter of 35â¯Î¼m and the thickness of 10â¯Î¼m after 5â¯h ball-milling, and then the flakes would be further fractured to smaller pieces as increasing the milling time. The as-made Fe flakes were subsequently encapsulated within SiC nanopowders by high-speed mixing at 120â¯Â°C for 2â¯h under nitrogen atmosphere. By turning the ball-milling time and the Fe/SiC ratios, the reflection loss (RL) could be optimized to â10â¯dB in the frequency ranges of 21.5-22.3â¯GHz and 20.1-26.5â¯GHz for the absorber thicknesses of 0.3â¯mm and 0.5â¯mm, respectively. In particular, the maximum RL peaks for the flake-like Fe@SiC composites shifted to higher frequencies compared with the spherical Fe@SiC composite due to the increased magnetic anisotropy. The enhanced microwave absorption properties are a synergistic effect of magnetic loss and dielectric loss, resulting from the heterogeneous components, and their proper electromagnetic impedance matching.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Xiaofang Liu, Dianjun Zhang, Rongzhi Zhao, Yanhui Zhang, Mu Zhang, Jianjun Wang, Gaowu Qin, Xuefeng Zhang,