DLP-printed SiAlOC polymer-derived ceramics synthesised using siloxanes and metal chlorides for high-temperature applications

Metal-doped polymer-derived ceramics (PDCs) demonstrate notable semiconductor and high-temperature properties. The organometallic precursors suitable for ultraviolet (UV)-curable three-dimensional (3D) printing are limited by high costs and complex synthesis. This study developed a strategy for preparing metal-doped ceramic precursors based on the hydrolysis of cost-effective metal chlorides and siloxane monomers. Triethylamine was used to eliminate residual chlorides, which exerted an inhibitory effect on free radicals, realising the photocuring activity of the metal-doped ceramic precursors. Complex-structured SiAlOC ceramics were fabricated via digital light processing (DLP) 3D printing. The SiAlOC ceramic precursors exhibited excellent 3D-printing adaptability and exceptional high-temperature and oxidation resistance. In addition, Hf-, Zr- and Ti-doped SiOC ceramic precursors suitable for UV-curable 3D printing were successfully prepared using the proposed methodology. This study provided a viable pathway for the fabrication of complex-structured metal-doped SiOC ceramics, enabling their integration in high-temperature resistance applications.