Advanced Multi-Functional Coatings for Land-Based Industrial Gas Turbines

Abstract

The utilization of fossil fuels for powering industrial gas turbines is expected to continue growing resulting in continued emphasis on increasing performance and reliability while simultaneously providing a cost effective, efficient, and environmentally sound power generation solution. The push to higher firing temperatures, increased efficiencies, reduced emissions and multiple fuel capability continues to demand more out of the gas turbine design and materials systems capabilities. Coatings are an integral part of many IGT materials systems, contributing several key functions such as thermal and oxidation protection, clearance control, wear resistance and sensing capabilities. Each of these coating functionalities presents unique challenges and requirements as they are super-imposed upon each other, especially with engine operating conditions becoming harsher and increasing service interval expectations. A full life cycle systematic approach in understanding the materials systems performance limits is essential for a successful engine implementation. As an example, thermal barrier coating (TBC) systems degradation mechanisms will be presented and examples of innovative systematic approaches towards engineering of production feasible, advanced high temperature capable coating systems will be provided.