Development and Assessment of Coatings for Future Power Generation Turbines

Abstract

The NETL-Regional University Alliance (RUA) continues to advance technology development critical to turbine manufacturer efforts for achieving DOE Fossil Energy

Extreme Temperature Coatings for Future Gas Turbine Engines

“…Surface energy disper sive X-ray analyses (EDAX) identified the presence of alumina with hafnium-rich transient oxides [1], The average thickness of the surface oxide that formed after 50h of exposure in air was ~ 18 /(in, while in steam an aver age ~19.6 /mi scale thickness was formed.…”

“…In order to maintain the structural integrity of future land-based power generation turbine components under the extreme condi tions shown in Table 1, (1) durable TBCs, (2) high temperature creep resistant metal substrates, and (3) effective cooling techni ques, will be required [1], While advances in substrate materials have been limited for the past decades, thermal protection of turbine airfoils for future hydrogen-fired and oxy-fuel turbines will rely primarily on collective advances in TBCs and aerothermal cooling. To address the DOE FE goals for advanced power systems, NETL-RUA has developed an integrated materials, heat transfer, and secondary flow team effort whose primary goal is focused on achieving.…”

“…This overall suggests that significant advances in TBC performance and durability and turbine cooling effective ness must be achieved [1], Current coal-fired integrated gasification combined cycle (IGCC) plant operating efficiencies range between 35% and 45%. Technical advancement for any type of gas turbine generally implies better performance, greater efficiency, and extended com ponent life.…”

“…Future advanced hydrogen-fired and oxy-fuel turbines that are now being designed to meet DOE FE's goals will experience an enormous level of thermal and mechanical loading as TITs approach ~ 1425-1760 °C (~2600-3200 °F; Table 1) [1,3]. Currently there is no commercially available functional metallicbased system that can maintain a reasonable level of composi tional and microstructural stability for prolonged exposure above temperatures of ~1050°C (~ 1920 °F).…”