Proceedings of the Eighth European Conference on Chemical Vapour Deposition / Actes de la 8ème Confèrence Européenne sur les Dépôts Chimiques en Phase Gazeuse

J. Phys. IV France 02 (1991) C2-649-C2-655
DOI: 10.1051/jp4:1991278

FABRICATION AND EVALUATION OF SiC/C FUNCTIONALLY GRADIENT MATERIAL

M. SASAKI and T. HIRAI

Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980, Japan

Abstract
A plate-like deposit having a compositional gradient from carbon (C) to silicon carbide (SiC) (SiC/C FGM) was obtained on a graphite substrate with chemical vapour deposition (CVD) by changing the Si/C molar ratio in input gas during deposition. Cracking due to heat flux was investigated using a CO₂ laser setup. Heat flux which resulted in cracking in SiC-coated graphite (SiC NFGM) was 5.8 MWm^-2 at a surface temperature (T_s) of 1300 K and a reverse surface temperature (T_b of 1220 K. In the case of SiC/C FGM, heat flux occurred cracking was 7.4 MWm^-2 at a T_s of 1650 K and a T_b of 1080 K. The temperature difference between T_s and T_b was 570 K in FGM and 80 K in NFGM. Thermal stress calculation showed that in cracking caused by hoop stress, the stress was close to the fracture strength of SiC. It was clear that SiC/C FGM has effective thermal shock resistance and thermal barrier characteristics.

© EDP Sciences 1991

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