Emerging Coating Materials for H2 powered Turbines

Hydrogen-fueled gas turbines have the capability to offer greater energy efficiency with no or reduced CO₂ emissions. Compared to natural gas combustion, H₂ combustion has a higher adiabatic flame temperature, laminar flame speed, and steam concentration. This combination of effects creates several major challenges for thermal and oxidation protection coating materials that are currently in use in the turbine hot sections. There is an increasing need for low thermal conductivity and calcium-magnesium-aluminosilicate (CMAS) resistant thermal barrier chemistries and structures as the limits of traditional 7 weight % yttria stabilized zirconia thermal barrier coatings are being breached. Additionally, new, and advanced coating deposition technologies are required to meet the need for expanded geometric coverage of turbine hot section components. This talk will address several materials programs underway at Praxair Surface Technologies to address the higher temperature and corrosion resistance requirements that will be placed on turbine coatings as turbine fuels move towards these new greener technologies.