APPLICATIONS OF CERAMIC COATINGS AS TBCs ON THE INTERNAL COMBUSTION ENGINE VALVES
Abstract: This study was started to see whether the use of thermal barrier coatings (TBC) can be extended to internal combustion engines using gasoline as fuel as to see the viability of other types of coatings with role of the thermal barrier than the usual zirconia. To this end, we covered three different types of powders on a set of valves, and then we tested them as close to reality as possible on a stand made up of a Dacia 1310 engine. It was noteworthy in the first instance that the exhaust gases resulted fall within the permissible limits, and after a while on the surface of the valve discs the specific tribofilm formed by the combustion residues is deposited together with a very fine film of carbon which continues to act by doubling the thermal barrier effect of the coating.
Key words: ceramic coatings, TBC, valve discs, internal combustion gasoline engine.
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