Comparison of fluorination treatments to improve the high temperature oxidation resistance of TiAl alloys in SO2 containing environments


Comparison of fluorination treatments to improve the high temperature oxidation resistance of TiAl alloys in SO2 containing environments

Masset, P. J.; Yankov, R.; Kolitsch, A.; Schütze, M.

Surfaces of titanium aluminides were treated with fluorine either physically by plasma immersion ion implantation (PIII) or chemically using a F-based polymer. Under optimum conditions of fluorination, both treatments were shown to improve the oxidation resistance of the alloys even in aggressive environments containing sulfur dioxide (0.1 vol. %). No sulfur was detected in the oxide scale although thermodynamic calculations predict the formation of sulfides. The inward diffusion of oxygen and nitrogen was found to be reduced in the presence of SiO2.

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Publ.-Id: 14682