Journal
SURFACE & COATINGS TECHNOLOGY
Volume 222, Issue -, Pages 128-134Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2013.02.014
Keywords
Titanium aluminides; Intermetallic coatings; Thermal barrier coatings; Oxidation resistance; Oxide scale
Funding
- FP6 Integrated Project [INNOVATIAL-NMP3-CT-2005-515844]
- European Commission
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Samples of a high niobium bearing gamma-TiAl based alloy were coated with intermetallic Ti-52Al-15Cr-0.4Y (in at.%) layers produced by magnetron sputtering. On some of the specimens thermal barrier coatings of 7 wt.% yttria partially stabilised zirconia were deposited using electron-beam physical vapour deposition. The oxidation behaviour of the coated Ti-45Al-8Nb (at.%) alloy with and without thermal protection was investigated at 950 C under cyclic oxidation conditions in air. The 20 pm thick Ti-Al-Cr-Y layer exhibited excellent oxidation resistance at this exposure temperature associated with the formation of a thin continuous alumina scale. Lifetimes exceeding 1000 cycles of 1 h dwell time at 950 degrees C were determined for the TBC system consisting of zirconia topcoat and Ti-Al-Cr-Y bond coat. (C) 2013 Elsevier B.V. All rights reserved.
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