The complex interface construction and microwave absorbing behavior of Fe2AlB2 MAB

MAB-phase materials have attracted increasing attention for electromagnetic wave absorption owing to their high electrical conductivity, excellent high-temperature resistance, and unique layered structure. However, their practical application in electromagnetic protection remains limited by insufficient reflection loss, narrow effective absorption bandwidth, and poor impedance matching. In this work, Fe2AlB2 MAB ceramics were synthesized by pressureless sintering, and the effects of sintering temperature and Al molar ratio on phase formation and microwave absorption performance were systematically investigated. Al2O3 nanocrystals were introduced to form extensive interfaces with the MAB matrix. As a result, the optimized sample achieved a minimum reflection loss (RLmin) value of −49.56 dB at a frequency of 7.29 GHz, and the effective absorption bandwidth (EAB) reached 3.87 GHz. The nano-layered structure and multi-heterogeneous interface effectively enhance microwave absorption capability. Meanwhile, Al2O3 has a significant effect on impedance matching and improves absorption performance. This study provides useful guidance for the structural design and mechanism analysis of MAB-phase materials and offers a new strategy for producing high-performance absorbing materials with low-frequency and strong absorption characteristics.

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