Laser‐induced self‐propagating synthesis of Al ₃ BC ₃ powder for high‐temperature electromagnetic wave absorption

Abstract Electromagnetic wave (EMW) absorbing materials play an increasingly crucial role in mitigating electromagnetic pollution. In this study, the laser‐induced self‐propagating synthesis (LSS) method was employed to successfully produce Al 3 BC 3 powders with a purity of up to 98.8 wt.% using aluminum powder, boron carbide powder, and carbon powder as raw materials. The preparation efficiency was increased by approximately 20–360 times compared to conventional heating methods. Additionally, the as‐synthesized Al 3 BC 3 powder exhibited remarkable oxidation resistance, with an apparent oxidation activation energy ( E ) of 213.04 kJ/mol and a preexponential factor of 5.38. Moreover, the powder demonstrated superior EMW absorption performance at 973 K, with a reflection loss below –10 dB within the frequency range of 6.74–7.97 GHz and a minimum reflection loss reaching –45.86 dB at a thickness of 2.9 mm. These results suggest that the as‐synthesized Al 3 BC 3 powder is a promising candidates for high‐temperature EMW absorption applications.