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Multilayer coatings on CFC composites for high-temperature applications

: Wunder, V.; Popovska, N.; Wegner, A.; Emig, G.; Arnold, W.


Surface and coatings technology 100-101 (1998), pp.329-332
ISSN: 0257-8972
Journal Article
Fraunhofer IZFP ()

The interest in carbon-fiber-reinforced carbon (CFC) composites has increased recently because of their excellent performance an high temperatures. However, a protective coating is necessary to avoid the oxidation of carbon. Multilayer coatings on CFC composites consist of pyrolytic carbon (PyC), hafnium carbide (HfC) and silicon carbide (SiC) as a ground layer, diffusion barrier and oxidation protection, respectively. The HfC coating was desposited by a thermally induced chemical vapor deposition (CVD) technique using a gas mixture of hafnium tetrachloride, methane and hydrogen as precusor. The SiC was desposited from methyltrichlorosilane (MTS) and hydrogen. The coatings were characterised by transmission electron microscopy (TEM), scanning electron mieroscopy (SEM), auger electron spectroscopy (AES), and X-ray diffraction (XRD). The quality of the adhesion of the coatings was measured by ultrasonics.