Synthesis, Characterization of Perhydropolysilazane and its Application in the Preparation of 3D SiO2f/Si 3N4 Composites
Perhydropolysilazane was synthesized by the ammonolysis of dichlorosilane-pyridine adduct, and used as precursor to prepare three-dimensional silica fiber reinforced silicon nitride matrix composites via preceramic polymer infiltration and pyrolysis at 1073Kin anhydrous ammonia atmosphere. The polymer-derived ceramic matrix was amorphous near-stoichiometric silicon nitride with an empirical formula of SiN1.34O0.02C0.01H1.21. The as-received composites were amorphous with a high density of 1.96g/cm3 after five infiltration-pyrolysis cycles. The process was successful to fabricate dense silicon nitride matrix composites reinforced by three-dimensional silica fiber due to the low viscosity, good wettability and high ceramic yield of perhydropolysilazane.
Wei Pan and Jianghong Gong
G. J. Qi et al., "Synthesis, Characterization of Perhydropolysilazane and its Application in the Preparation of 3D SiO2f/Si 3N4 Composites", Key Engineering Materials, Vols. 336-338, pp. 1233-1235, 2007