Synthesis, Characterization of Perhydropolysilazane and its Application in the Preparation of 3D SiO2f/Si 3N4 Composites

Abstract:

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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.

Info:

Periodical:

Key Engineering Materials (Volumes 336-338)

Edited by:

Wei Pan and Jianghong Gong

Pages:

1233-1235

DOI:

10.4028/www.scientific.net/KEM.336-338.1233

Citation:

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

Online since:

April 2007

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$35.00

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