Anomalous electromagnetic wave absorption of MAX phase ceramic powder achieved through high entropy solid solution and melt pool heat transfer preparation method

Electromagnetic wave (EMW) absorbing materials face severe challenges in achieving effective absorption in low frequency bands. This work successfully synthesized a new type of high entropy MAX phase (HE MAX) absorption material using a low-temperature one-step solid-state reaction method. By adding magnetic elements and controlling the grain microstructure, the sample has strong EMW absorption ability in low-frequency bands. By changing the elements used as solvent pool in the raw materials, the electromagnetic loss synergy and impedance matching enhancement of the materials were achieved, and the absorption frequency band broke through to the low-frequency bands. The minimum reflection loss (RL_min) of the sample using Al as the solvent pool (HE-MAX Al) reaches − 37.4 dB (3.0 mm) in the C-band. The HE-MAX series ceramics prepared are a new type of low-frequency band strong EMW absorbing material, which is expected to be applied in extreme working environments such as strong irradiation, oxidation resistance, and corrosion resistance.