Development of oxidation resistant high temperature NbTiAl alloys and intermetallics

M. Allouard; Y. Bienvenu; L. Nazé; C.B. Brancho-Troconis

doi:doi:10.1051/jp4:1993944

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) C9-419-C9-428
DOI: 10.1051/jp4:1993944

Development of oxidation resistant high temperature NbTiAl alloys and intermetallics

M. Allouard, Y. Bienvenu, L. Nazé and C.B. Brancho-Troconis

Ecole des Mines de Paris, Centre des Matériaux P.M. Fourt, BP. 87, 91003 Evry Cedex, France

Abstract
The effect of alloying elements like Ti, Al, Cr, V and Mo on the oxidation resistance of Nb at high temperature (between 700 °C and 1400 °C) has been studied. The value of the parabolic oxide growth constants, [MATH], depends on the nature and morphology of oxides formed in the external scale. The growth of protective oxides, like alumina, requires a high content of alloying elements, which usually means a lower melting point and the formation of brittle phases.