Investigation of CVD processes to perform dense α-alumina coating on superalloys
In: Journal of the Electrochemical Society, Jg. 151 (2004), Heft 3, S. C182- (5S.)
academicJournal
- print, 14 ref
Zugriff:
Coated nickel-based superalloys are widely used as superior material systems in gas turbines, where the overlay coatings help withstand hot corrosion and serve as bond coats for the thermal barrier layer. However, interdiffusion may limit the coatings' lifetime, a potential remedy being a diffusion harrier layer. In this context, the chemical vapor deposition (CVD) process was investigated to deposit α-Al2O3 on superalloy substrates. Deposited films using an AlCl3/CO2/H2gas mixture at low and atmospheric pressure were characterized. Difficulties including whisker growth at low pressure and the growth of noncompact large crystals at atmospheric pressure are discussed jointly with strategies for suppressing them. In addition, the potential of alternative precursors to produce α-Al2O3 films was investigated using aluminum tri-isopropoxide in an adequate reactor geometry.
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Investigation of CVD processes to perform dense α-alumina coating on superalloys
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Autor/in / Beteiligte Person: | BAHLAWANE, N ; BLITTERSDORF, S ; KOHSE-HÖINGHAUS, K ; ATAKAN, B ; MÜLLER, J |
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Zeitschrift: | Journal of the Electrochemical Society, Jg. 151 (2004), Heft 3, S. C182- (5S.) |
Veröffentlichung: | Pennington, NJ: Electrochemical Society, 2004 |
Medientyp: | academicJournal |
Umfang: | print, 14 ref |
ISSN: | 0013-4651 (print) |
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