Tailored plasmonic interfaces on LAS glass-ceramic gratings for high-efficiency electromagnetic wave absorption

Reflection loss (RL) < −20 dB, a defining metric for high-performance electromagnetic absorption (EMA) materials, is indispensable for ensuring the reliability of aerospace high-temperature structural components. Lithium aluminum silicate (LAS)-based glass ceramics, renowned for their zero- expansion and structural stability under complex thermal environments, face dual bottlenecks: intricate shell design and suboptimal EMA efficiency. To address these limitations, this study integrates direct-write 3D printing (resolving high-solids-content slurry molding for complex geometries) with targeted interface engineering to construct tailored plasmonic interfaces. This synergy enables the fabrication of LAS glass-ceramic gratings with a surface electromagnetic absorption network, achieving synergistic coating-structure wave absorption. The prepared materials exhibit full X-band coverage, with an RL < −20 dB effective bandwidth of 2.33 GHz, an enhancement directly attributed to the interplay between structural design and tailored plasmonic interfaces. Mechanically speaking, the plasma interface designed through engineering is enhanced in its microwave scattering effect by the collective oscillation of free electrons at the interface. Meanwhile, the three-dimensional printed layered structure provides mechanical strength and impedance matching characteristics. This work delivers a scalable technical solution and practical precedent for developing high-efficiency EMA materials for complex high-temperature aerospace components, underscoring the pivotal role of tailored plasmonic interfaces in overcoming the “single-mechanism” limitation and advancing electromagnetic absorption performance.