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Effect of Water Vapor on the Oxidation Behavior of the Eutectic High‐Temperature Alloy Mo‐20Si‐52.8Ti
Author(s) -
Weber Matthias,
Gorr Bronislava,
Christ Hans-Jürgen,
Obert Susanne,
Kauffmann Alexander,
Heilmaier Martin
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202000219
Subject(s) - water vapor , eutectic system , alloy , oxidizing agent , materials science , atmosphere (unit) , diffusion , oxide , kinetics , metallurgy , chemical engineering , chemistry , thermodynamics , physics , organic chemistry , quantum mechanics , engineering
Herein, the effect of water vapor on the oxidation resistance of the alloy Mo‐20Si‐52.8Ti (at%) is investigated. The alloy is oxidized in dry, wet, as well as in in situ changing atmospheres at 1100 °C. The oxidation kinetics changes from nearly parabolic to linear if water vapor is present in oxidizing atmosphere. Under all conditions, the oxide scales consist of an outer TiO 2 and a TiO 2 SiO 2 duplex layer underneath. In wet atmosphere, the thicknesses of the two regions substantially increase indicating a severe ingress of water vapor. The inferior oxidation resistance in wet environment is primarily rationalized by the fast diffusion of H 2 O through SiO 2 .
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