Comparison of Different Fluorine Treatments for the Protection of TiAl-Alloys Against High Temperature Oxidation


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The oxidation resistance of TiAl-alloys can be improved by several orders of magnitude by treating the surface of the materials with small amounts of halogens especially Cl and F. The oxidation mechanism changes due to the so called halogen effect. The formation of a fast growing mixed oxide scale on untreated alloys is suppressed, instead a thin protective alumina scale is formed on samples after optimum treatment. The different methods only influence the surface region of the components so that the bulk properties are not affected. Recent results achieved with complex TiAl-samples showed the potential that the fluorine effect could be used for TiAl-components in several high temperature applications e.g. jet engines. TiAl-specimens were treated with fluorine and chlorine in several ways and their performance during high temperature oxidation tests in air was investigated. Results of isothermal and thermocyclic oxidation tests are presented. The long term stability of the fluorine effect lasted for at least one year under thermocyclic exposure at 900°C in laboratory air. The results are discussed in terms of later use of the fluorine effect for technical applications.



Materials Science Forum (Volumes 638-642)

Main Theme:

Edited by:

T. Chandra, N. Wanderka, W. Reimers , M. Ionescu




A. Donchev and M. Schütze, "Comparison of Different Fluorine Treatments for the Protection of TiAl-Alloys Against High Temperature Oxidation", Materials Science Forum, Vols. 638-642, pp. 1294-1299, 2010

Online since:

January 2010




[1] S. Becker et al.: Oxidation of Metals 38 (1992) 425.

[2] J. Doychak: Intermetallic Compounds, ed.: J.H. Westbrook and R.L. Fleischer, John Wiley & Sons, New York (1994) 977.

[3] Y. Shida and H. Anada: Oxidation of Metals 45 (1996) 197.

[4] T.C. Munro and B. Gleeson: Met. Mat. Trans. A 27 (1996) 3761.

[5] Z. Tang et al.: Surface and Coatings Techn. 110 (1998) 57.

[6] M. Schütze and M. Hald: Mat. Sci. Eng. A 239-240 (1997) 847.

[7] M. Schütze et al. : Corrosion Science 44 (2002) 303.

[8] A. Rahmel et al. : Materials and Corrosion 46 (1995) 271.

[9] A. Zeller et al. : Intermetallics 10 (2002) 59.

[10] A. Donchev et al. : Intermetallics 14 (2006) 1168.

[11] A. Donchev and M. Schütze: Materials and Corrosion 59 (2008) 489.