Formation and characterisation of NiAl-Ti coating on nickel-based superalloy B1900

Alumina‐former coatings have been known as the best surface engineering approach to combat high temperature corrosion in gas turbine industry. In this investigation, attempts have been made to obtain a titanium‐modified aluminide coating with improved protective properties. Modification has been ach...

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Published in:Surface and interface analysis 2009-05, Vol.41 (5), p.378-383
Main Authors: Shahriari, F., Ashrafizadeh, F., Saatchi, A.
Format: Article
Language:English
Subjects:
aluminising
characterisation
NiAl-Ti coating
surface engineering
Ti-modified
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description Alumina‐former coatings have been known as the best surface engineering approach to combat high temperature corrosion in gas turbine industry. In this investigation, attempts have been made to obtain a titanium‐modified aluminide coating with improved protective properties. Modification has been achieved by introducing titanium in the coating composition by a two‐stage coating treatment; titanium coating and subsequent aluminising. The modified coatings were characterised and compared with simple aluminides by means of electron metallography, depth elemental profiling and x‐ray diffraction techniques. Experimental results indicated that pre‐titanising diffusion treatment is an effective route to modify chemical composition of simple aluminide coating. The final microstructure of the coating was β‐NiAl matrix with titanium‐bearing precipitates mainly distributed in near surface layers. The mechanism of the coating formation is discussed. Copyright © 2009 John Wiley & Sons, Ltd.
doi_str_mv 10.1002/sia.3031
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subjects aluminising
characterisation
NiAl-Ti coating
surface engineering
Ti-modified
title Formation and characterisation of NiAl-Ti coating on nickel-based superalloy B1900
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