Inconel 718 coupons were coated with titanium and aluminum oxides by Pulse Laser Deposition. The effectiveness of these coatings in inhibiting carbon deposition and metal sulfide formation from heated JP-8 fuel was studied. Approximately 1 μm coatings of Al and Ti oxides were obtained on Inconel 718 coupons using pulsed laser deposition. JP-8 fuel stressing at 470°C and 34 atm in the presence of bare and coated Inconel 718 coupons indicated that both coatings reduced carbon deposition by eliminating the catalytic activity of the metal alloy surface. No metal sulfide formation was observed on the Ti and Al oxide coated surfaces after thermal stressing with the JP-8 fuel. The Al oxide coated surface collected a larger amount of carbon deposit than the Ti oxide coated surface presumably because of the presence of metallic Al in the former. For better and efficient coating of stable α-Al2O3 oxide, the substrate temperature could be increased to 850°C to reduce the metallic Al formation. This might totally eliminate sulfur corrosion and subsequent surface roughening upon stressing with the jet fuel.
|Original language||English (US)|
|Number of pages||3|
|Journal||ACS Division of Fuel Chemistry, Preprints|
|State||Published - Sep 1 2004|
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