(203e) Inhibition of Carbon Deposition from Jet Fuel by Surface Coating

Solid deposits are formed on metal surfaces from reactions with fuel in a jet engine. The deposits consists of metal sulfides and carbonaceous solids. Coating metal surfaces with inert materials inhibits the formation of these deposits. Alumina films were deposited on the surface of stainless steel by low pressure metal-organic chemical vapor deposition. Alumina-coated surfaces were tested by thermal stressing of jet fuel under autoxdative conditions at 330 - 380 °C. Characterization of the deposits by temperature programmed oxidation and scanning electron microscopy showed that the alumina coatings inhibit the formation of metal suflides and decrease the amount of carbonaceous solid deposits.