28-04-2014, 02:55 PM
The role of reactive elements in thermal barrier coatings
ABSTRACT
the thermal barrier coating of jet engine turbines permits operation at what otherwise would be prohibitively high temperatures. Ideally, a jet engine should operate at very high temperatures to maximize fuel efficiency and power. A TBC consists of three primary layers that cover the macroscopic engine super alloy: the YSZ thermal protective layer, the thermally grown oxide formed through bond coat oxidation, and the metal alloy bond coat composed of Ni CrA1Y. Therefore, it is important to develop a ceramic coating to act as a thermal barrier that increases the operational lifetime of jet engines and permits higher operating temperatures, thereby increasing thrust and fuel efficiency. The TBC of choice, a thin yttria-stabilized-zirconia coating.