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1 PublicationEfficient oxidation protection of Ti- and TiAl-alloys by fluorine treatments
Donchev, A.; Schütze, M.; Yankov, R. A.; Kolitsch, A.
Abstract
Ti-alloys suffer from high oxidation rates and oxygen uptake during exposure in oxidizing environments at elevated temperatures above approximately 600°C. TiAl-alloys have the same problem due to the insufficient oxidation resistance at temperatures above 850°C. The use of these alloys is hence limited. The fluorine effect is a very promising way to improve the oxidation resistance of TiAl-alloys. Defined amounts of fluorine in the surface zone of TiAl-components change the oxidation mechanism. A protective alumina layer is formed which prevents further oxidation and subsequently allows the use of this new alloy family in several high temperature applications. The Al-content of standard Ti-alloys is not enough to get the fluorine effect to operate but after Al-enrichment of the surface zone a subsequent fluorination leads to the same results. In this paper results of oxidation tests of untreated and treated Ti- and TiAl-alloys will be presented and their behavior compared.
Keywords: TiAl-alloys; oxidation resistance; Al-enrichment
Involved research facilities
- Ion Beam Center DOI: 10.17815/jlsrf-3-159
Related publications
- DOI: 10.17815/jlsrf-3-159 is cited by this (Id 17211) publication
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Lecture (Conference)
TMS Annual Meeting 2012, 11.-15.03.2012, Orlando, Florida, USA
Permalink: https://www.hzdr.de/publications/Publ-17211