Liquid single-source-precursor synthesis and phase evolution of SiC-HfC-C ceramics nanocomposites with core-shell structured SiC@C and HfC@C nanoparticles
Zhaoju Yu,
Zhenyue Wang,
Xichao Dong,
Jia Sun,
Xingang Luan,
Ralf Riedel
Affiliations
Zhaoju Yu
College of Materials, Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen, 361005, China; College of Materials, Xiamen Key Laboratory of Electronic Ceramic Materials and Devices, Xiamen University, Xiamen, 361005, China; Corresponding author. College of Materials, Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen, 361005, China.
Zhenyue Wang
College of Materials, Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen, 361005, China
Xichao Dong
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an, 710072, China
Jia Sun
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an, 710072, China
Xingang Luan
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an, 710072, China; Corresponding author.
Ralf Riedel
Department of Materials and Earth Sciences, Technical University of Darmstadt, 64287, Darmstadt, Germany
Liquid polymeric precursors have found wide applications as a matrix source for continuous fiber reinforced ceramic matrix composites (CMCs) because of their excellent fluidity and high ceramic yield. In the present study, a processable liquid single-source-precursor was synthesized using allylhydropolycarbosilane (AHPCS) and low-cost hafnium tetrachloride (HfCl4) as raw materials to form final SiC-HfC-C nanocomposites by well-known polymer-derived ceramic (PDC) approach. The precursor synthesis, thermal behavior, polymer-to-ceramic transformation and ceramic phase evolution were investigated by FT-IR, TGA, XRD and TEM. The TGA results show that the obtained single-source-precursor exhibits very high ceramic yields of over 80.0 wt% after heat treated at 1400 °C. After annealing at 1600 °C, the resultant SiC-HfC-C nanocomposites contain SiC@C and HfC@C nanoparticles with SiC and HfC as cores and amorphous carbon as shells. The present single-source-precursor is candidate material for CMC applications due to its liquidity and high ceramic yield.