| Numéro |
J. Phys. IV France
Volume 03, Numéro C9, Décembre 1993
Proceedings of the 3rd International Symposium on High Temperature Corrosion and Protection of MaterialsActes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température |
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|---|---|---|
| Page(s) | C9-843 - C9-853 | |
| DOI | https://doi.org/10.1051/jp4:1993987 | |
Proceedings of the 3rd International Symposium on High Temperature Corrosion and Protection of Materials
Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température
J. Phys. IV France 03 (1993) C9-843-C9-853
DOI: 10.1051/jp4:1993987
1 Université de Limoges, Faculté des Sciences, Laboratoire de Céramiques Nouvelles, URA CNRS 320,123, Avenue Albert Thomas, 87060 Limoges Cedex, France
2 SEP, 33 165 Saint-Médard-En-Jalles Cedex, France
© EDP Sciences 1993
Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température
J. Phys. IV France 03 (1993) C9-843-C9-853
DOI: 10.1051/jp4:1993987
Protection against oxidation of C/SiC composites: oxidation behaviour of CVD TiB2 coated substrates
C. Courtois1, J. Desmaison1 and H. Tawil21 Université de Limoges, Faculté des Sciences, Laboratoire de Céramiques Nouvelles, URA CNRS 320,123, Avenue Albert Thomas, 87060 Limoges Cedex, France
2 SEP, 33 165 Saint-Médard-En-Jalles Cedex, France
Abstract
Titanium diboride coatings (20 or 30 µm thick), deposited by hydrogen reduction
of TiCl4 and BC13, are protecting C/SiC substrates against oxidation up to 1100 °C. The oxidation
of TiB2 leads to the formation of a protective low viscosity B2O3 glass filling the cracks
of the primary CVD-SiC oxygen barrier. Above this temperature, the rapid consumption of the
B2O3 glass by vaporization limits the duration of the protection system. A comprehensive description
of the oxidation mechanism, based on a complementary experimental study of B2O3
evaporation, is presented.
© EDP Sciences 1993