Graphite/epoxy-coated flaky FeSiCr powders with enhanced microwave absorption

• Main Authors: Zhang, Haonan, Zhong, Xichun, Hu, Jinwen, He, Na, Xu, Hanxing, Liao, Xuefeng, Zhou, Qing, Liu, Zhongwu, Ramanujan, Raju V.
• Other Authors: School of Materials Science and Engineering
• Format: Article
• Language: English
• Published: 2024
• Subjects: Engineering; Carbon materials; Microwave absorption
• Online Access: https://hdl.handle.net/10356/174034
• Institution: Nanyang Technological University

Flake-shaped FeSiCr (FFSC) material is expected to be a promising microwave absorbent due to its excellent magnetic properties and environmental resistance. By introducing carbon-based materials through suitable coatings, the electromagnetic parameters and energy loss can be tuned to improve the performance of FFSC. A facile solution-blending method was deployed to prepare graphite- and epoxy resin-encapsulated FFSC (FFSC@G/E) powders with a core–shell structure. FFSC@G2000/E showed excellent performance in the X band (8–12 GHz), a minimum reflection loss (RLmin) of −42.77 dB at a thickness of 3 mm and a maximum effective absorption bandwidth (EABmax, RL < −10 dB) that reached 4.55 GHz at a thickness of 2.7 mm. This work provides a route for the production of novel high-performance microwave absorbers.