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Surface Treatment of TiAl with Fluorine for Improved Performance at Elevated Temperatures

Published online by Cambridge University Press:  21 September 2018

A. Donchev ,
P.J. Masset  and
M. Schütze
A. Donchev
Affiliation:
DECHEMA e.V. Karl-Winnacker-Institut, Theodor-Heuss-Allee 25, D-60486 Frankfurt/Germany
P.J. Masset
Affiliation:
DECHEMA e.V. Karl-Winnacker-Institut, Theodor-Heuss-Allee 25, D-60486 Frankfurt/Germany
M. Schütze
Affiliation:
DECHEMA e.V. Karl-Winnacker-Institut, Theodor-Heuss-Allee 25, D-60486 Frankfurt/Germany
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Abstract

Alloys based on aluminium and titanium are possible materials for several high temperature applications. The use of TiAl would increase the efficiency of e.g. aero turbines, automotive engines and others due to their properties, among others low specific weight and good high temperature strength. The oxidation resistance is low at temperatures above approximately 800°C so that no long term use of TiAl-components is possible without improvement of the oxidation behaviour. Small amounts of halogens in the surface zone of TiAl-samples lead to a dramatic improvement of the oxidation resistance at temperatures up to 1100°C for more than 8000 hours in air. In this paper results of the work on the halogen effect over the last years are presented. The results of thermogravimetric measurements, thermocyclic oxidation tests of small coupons and thermodynamic calculations for different atmospheres (e.g. air, H2O, SO2) are shown and the halogen effect mechanism is discussed. The postulated mechanism is in good agreement with the results of the oxidation tests. The limits of the halogen effect will also be mentioned. Predictions for the halogenation of TiAl-components can be given so that the processing can be planned in advance.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U04-09
Copyright
Copyright © Materials Research Society 2009

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