Chinese research teams have achieved landmark progress in polyborosilazane-derived SiBCN ceramic composites, a new material integrating lightweight design, ultrahigh temperature resistance and electromagnetic stealth functions, outperforming traditional high-temperature alloys, structural ceramics and conventional wave-absorbing coatings. Fabricated via polymer precursor conversion route, the material supports integrated molding of intricate precision parts through 3D printing and can be processed into films, fibers and protective coatings. It maintains stable long-term service under 1200–1600℃ in air, while modified variants endure transient temperature up to 1800℃. Thanks to molecular-level microstructure regulation, it delivers efficient high-temperature wave absorption without heavy metal fillers and steadily covers X-band at 600℃. The SiBCN/SiC dual-phase system features high-temperature self-repair performance, retaining over 86% strength after long-hour oxidation at 1000℃. The finalized SiBCN aerogel boasts ultra-low thermal conductivity of 0.044W/(m·K) with remarkable lightweight merits. Domestic precursor synthesis technology cuts production costs steadily, and multiple aerospace and military manufacturers have launched small-batch trials. The material will be widely applied in hypersonic vehicles, aero-engines, deep space exploration and advanced nuclear energy, underpinning independent R&D of core foundational materials for high-end equipment. For more information, please visit https://v.douyin.com/cqWECsXikiE