Journal
CORROSION SCIENCE
Volume 88, Issue -, Pages 360-371Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2014.07.058
Keywords
Rare earth elements; SEM; TEM; Oxidation; High temperature corrosion
Funding
- Alexander von Humboldt Foundation, Bonn, Germany
- Deutsche Forschungsgemeinschaft (DFG) within the framework of the research unit 727 Beyond Ni-Base Superalloys
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High temperature oxidation behavior of a Mo-9Si-8B (at.%) alloy containing 0.2 and 2 at.% La was studied between 750 and 1400 degrees C in static air. Isothermal thermogravimetric analysis for up to 72 h indicated a significant improvement in the oxidation resistance of the 2La-alloyed material in the 750-1000 degrees C temperature range. The oxide layers characterized by XRD, SEM, EDS, and FIB-TEM revealed the formation of more stable lanthanum-molybdates (xLa(2)O(3)center dot yMoO(3)), which reduces the evaporation of MoO3 below 1000 degrees C. The thickness data obtained for the external scale and the inner oxidation layers indicated a reduction of inward diffusion of oxygen with higher La concentrations. (C) 2014 Elsevier Ltd. All rights reserved.
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