Abstract
Abstract
Ti-alloys cannot be used at elevated temperatures above approximately 600°C in oxidizing environments. They suffer from accelerated oxidation and oxygen uptake in the subsurface zone, which deteriorates the mechanical properties. The addition of Al (usually < 10%) into standard Ti-alloys is not enough to form a protective alumina layer. Aluminization of technical Ti-alloys and formation of intermetallic Al-rich phases (e.g. TiAl3) change the oxidation behavior from fast and non-protective rutile formation to slow growing alumina kinetics, but only for a limited period of time. A subsequent fluorination of the aluminized components gets the fluorine effect to operate. This is a way to improve the resistance of technical Ti-alloys against environmental attack, even for longer service times. In this paper the results of high temperature oxidation tests of several untreated and treated Ti-alloys will be presented and their behavior compared.
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Donchev, A., Galetz, M., Schütze, M., Yankov, R., Kolitsch, A. (2014). Protection of Ti-Alloys against High Temperature Environmental Attack by a Two Step Process, Aluminization + Fluorination. In: TMS 2014: 143rd Annual Meeting & Exhibition. Springer, Cham. https://doi.org/10.1007/978-3-319-48237-8_11
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DOI: https://doi.org/10.1007/978-3-319-48237-8_11
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48593-5
Online ISBN: 978-3-319-48237-8
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