Abstract
Degradation of hot section components in the turbine section of gas turbines used in the power generation industry can cause significant problems including financial penalties associated with down time and a decrease in operating efficiency. Thermal barrier coatings (TBCs) have been used effectively for the past two decades to mitigate such losses. The advent of dense and vertically macro-cracked TBCs has seen increasing use, although there is little published data as to its efficacy in performance vis-à-vis standard TBCs. This paper will present some mechanical and high temperature test data of such coatings. Effects of spray process and powders will be examined and discussed. The purpose of this paper is to share some of the experiences of a service provider in discussing various coatings options available to the user of the gas turbine.
