Numéro
J. Phys. IV France
Volume 03, Numéro C9, Décembre 1993
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
Page(s) C9-843 - C9-853
DOI http://dx.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

Protection against oxidation of C/SiC composites: oxidation behaviour of CVD TiB2 coated substrates

C. Courtois1, J. Desmaison1 and H. Tawil2

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


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