Carbon‐Regulated DLP 3D Printing of Hyperbranched Polysiloxane‐Derived Ceramic Metamaterials for Broadband Microwave Absorption

ABSTRACT The integration of polymer‐derived ceramic (PDC) technology with UV‐assisted 3D printing represents a pivotal cutting‐edge approach for fabricating ceramics with highly complex geometries and superior precision. This methodology requires ceramic precursor resins to possess low viscosity, high ceramic yield, and excellent photoreactivity. Herein, we developed a novel photosensitive polysiloxane precursor resin which, owing to its hyperbranched architecture, exhibits ultra‐low viscosity (<500 mPa·s), rapid photocuring characteristics (photocrosslinking time <2 s), and outstanding ceramic yield (76.8 wt% after pyrolysis at 1000°C under Ar). Furthermore, through precise carbon modulation and structural design, we fabricated ceramic materials with exceptional microwave absorption performance (effective absorption bandwidth up to 9.82 GHz). The diluent‐free, high‐performance precursor resin developed in this study holds significant potential for application in the field of 3D‐printed ceramic structural materials.