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Ceramic thermal barrier coatings (TBCs), applied to diesel pistons, beads and valves, provide higher operating temperatures to improve thermal efficiency and control temperatures within the combustion chamber and exhaust systems. The results are advanced emission control of particulate matter, soot and smoke (opacity) and reduction of the damaging effects of heat to engine components. Management of the temperatures within the cylinder and exhaust systems is achieved by the ability of diesel ceramic coatings to reduce the amount of heat transferred from the combustion process into the engine components - an adjustment which improves the conditions for heat utilization, or removal, from the exhaust gases. Additionally, since engine components run cooler (under the ceramic coatings), the operating thermal stresses are reduced and engine operating life is increased.

Thermal barrier coatings (TBCs) have been employed for ten years in all types of diesel engines. TBCs have been used to reduce corrosion of pistons and valves, improve fuel efficiency, reduce pollution, allow use of lower quality fuels, improve cost start capability, reduce maintenance costs, improve power and improve lube oil life. Recently much interest has been demonstrated by transit operators in TBCs for pollution control and fuel economy results. A summary of the experience to date, current bus-related activities and advancements in thermal barrier coatings will be discussed. Diesel TBCs (thermal barrier coatings) are plasma-applied ceramic coatings which insulate combustion components such as pistons, valves and fire decks from thermal transmission and shock. Similar coatings have been effectively used in the aerospace industry for many decades.