Synthesis, Characterization of Perhydropolysilazane and its Application in the Preparation of 3D SiO_2f/Si ₃N₄ Composites

Abstract:

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 1073K
in 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.

• Periodical: Key Engineering Materials (Volumes 336-338)
• Pages: 1233-1235
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.336-338.1233
• Online since: April 2007
• Authors: Gon Jin Qi, Chang Rui Zhang, Hai Feng Hu, Feng Cao, Shao Qing Wang
• Keywords: Composite, Perhydropolysilazane, Silica Fiber

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