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HomeKey Engineering MaterialsKey Engineering Materials Vol. 537A C/SiC Graded Coating on C/C Composites by LPCVD...

A C/SiC Graded Coating on C/C Composites by LPCVD in the Methyltrichlorosilane/Hydrogen System

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Abstract:

In order to improve the anti-oxidation of C/C composites, a C/SiC functionally graded coating for C/C composites was prepared by low pressure chemical vapor deposition (LPCVD) using methyltrichlorosilane (MTS, CH3SiCl3) and H2 as precursors. The relative amount of C and SiC in coatings was varied by controlling the input ratio of H2 to MTS. The phase composition and morphology were examined by scanning electron microscope (SEM) and X-ray diffraction (XRD), and the content distribution of C and SiC phases were investigated by energy dispersive spectroscopy (EDS). The isothermal oxidation test was evaluated at 900 °C and 1500 °C respectively. The results showed that the as-obtained coatings were possessed of a dense and uniform structure, and the SiC content in coatings increased with an increment of the molar ratio of H2 to MTS. The C/SiC coating had a good oxidation resistance.

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Periodical:

Key Engineering Materials (Volume 537)

Pages:

32-35

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.537.32

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Online since:

January 2013

Authors:

Zi Bo He, He Jun Li, Xiao Hong Shi

Keywords:

C/SiC, Graded Coating, LPCVD, Oxidation Resistance

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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