Si-modified aluminide coatings deposited on Ti46Al7Nb alloy by slurry method

Ti46Al7Nb alloy has been used as the research substrate material for the deposition of water-based slurries containing Al and Si powders. The diffusion treatment has been carried out at 950 °C for 4 h in Ar atmosphere. The structure of the silicon-modified aluminide coatings 40 μm thick is as follow...

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Bibliographic Details
Published in:Intermetallics 2009-11, Vol.17 (11), p.965-967
Main Authors: Goral, M., Swadzba, L., Moskal, G., Hetmanczyk, M., Tetsui, T.
Format: Article
Language:English
Subjects:
A. Titanium aluminides, based on TiAl
A. Titanium silicides
B. Oxidation
C. Coatings, intermetallic and otherwise
G. Aero-engine components
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Summary:Ti46Al7Nb alloy has been used as the research substrate material for the deposition of water-based slurries containing Al and Si powders. The diffusion treatment has been carried out at 950 °C for 4 h in Ar atmosphere. The structure of the silicon-modified aluminide coatings 40 μm thick is as follows: (a) an outer zone consisting of TiAl 3 phase and titanium silicides formed on the matrix grain boundaries composed of TiAl 3–type Ti 5Si 3; (b) a middle zone containing the same phase components with the matrix TiAl 3 and the silicides Ti 5Si 3, which formed columnar grains; (c) an inner zone, 2 μm thick, consisting of TiAl 2 phase. Cyclic oxidation tests were conducted in 30 cycles (690 h at high temperature) and showed a remarkably higher oxidation resistance of the Ti46Al7Nb alloy with the protective coating in comparison with the uncoated sample.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2009.04.006