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Preparation and Property Study of 3D Cf/Si-Ti-C-O Composites Fabricated with Polytitanocarbosilane by PIP Process

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Abstract:

In this paper, 3D Cf/Si-Ti-C-O composites were prepared with a polytitanocarbosilane (PTC) via polymer infiltration and pyrolysis (PIP) process, and accordingly the mechanical, oxidation resisting and thermal shock resisting properties were investigated. The composites with density of 1.93g·cm-3 show rather high flexural strength (485.3MPa) and fracture toughness (19.95MPa⋅m1/2), and typical non-brittle fracture failure mode. After oxidation treatment at 1300°C for 10 minutes in air, the flexural strength of the samples is 306.2MPa, with 63% strength retention. After 5 times of thermal shock tests from room temperature to 1300°C, the flexural strength of the samples is 408.9MPa, about 85% strength retention. SEM observation also testifies non-brittle failure because many fibers are pulled out on the fracture surface. After oxidation treatment, the matrix shows no changes from XRD measurement.

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Periodical:

Key Engineering Materials (Volumes 336-338)

Pages:

1242-1244

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.336-338.1242

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Online since:

April 2007

Authors:

Qi Kun Wang, Hai Feng Hu, Wen Wei Zheng, Qing Song Ma, Zhao Hui Chen

Keywords:

Mechanical Property, Polytitanocarbosilane, Precursor, Pyrolysis

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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