Microstructure and phase evolution of polymer‐derived SiHfOC ceramic microspheres

• DOI: 10.1111/jace.18682
• Publication Date: 2022-07-30T09:59:27Z
• Authors: Xuemeng Zhang; Jia Sun; Yuyu Zhang; Hejun Li
• Keywords: 0103 physical sciences; 01 natural sciences

Abstract The SiHfOC ceramic microspheres were synthesized from the polysilazane and hafnium(IV) acetylacetonate hybrid precursors through a combination of hydrothermal method polymer‐derived ceramics (PDCs) method. consist β‐SiC, SiO 2 , m ‐HfO in an amorphous SiOC matrix are spherical morphology with average size about μm. Hafnium‐containing nanoparticles ∼50‐nm not only uniformly distributed on surface but also embedded microspheres, forming unique mosaic structure. Pyrolyzing at 1000°C offers possibility situ formation nanocrystal nuclei matrix, subsequent annealing 1500°C helps small grow separate into multiphase network containing nanocrystalline free C. This research provides methodology for preparing multicomponent that can efficiently develop high‐performance PDCs modified by transition metal alkoxide.