Method and coating system for reducing carbonaceous deposits on surfaces exposed to hydrocarbon fuels at elevated temperatures

摘要

A coating system (14) and method for reducing the tendency for hydrocarbon fluids, such as fuels and oils, to form carbonaceous deposits that adhere to the walls (12) of a containment article (10). Of particular concern are carbonaceous deposits that form at temperatures below about 650 DEG F (about 345 DEG C). The coating system (14) combines an outermost layer (18) of platinum with a ceramic barrier layer (16). The coating system (14) has been shown to significantly reduce the formation of carbonaceous deposits at temperatures between about 220 DEG F and 650 DEG F (about 105 DEG C to about 345 DEG C), as well as reduce the adhesion of such deposits. The platinum outermost layer (18) also serves as a radiation shield to reduce heat transfer from the containment article (10) to the hydrocarbon fluid. The outermost layer (18) is preferably deposited as an extremely thin film by chemical vapor deposition. The barrier layer (16) is deposited to a thickness sufficient to prevent interdiffusion of the platinum outermost layer (18) with the containment wall (12).