Performance Characteristics of Strain Tolerant TBC

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 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 still remain questions as to its cost versus benefits.  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 options available to the user of the gas turbine.