The effect of environment on thermal barrier coating lifetime

Pint, Bruce A.; Unocic, Kinga A.; Haynes, James Allen

doi:10.1115/1.4032438

Title: The effect of environment on thermal barrier coating lifetime

Journal Article · Tue Mar 15 00:00:00 EDT 2016 · Journal of Engineering for Gas Turbines and Power

DOI:https://doi.org/10.1115/1.4032438· OSTI ID:1261544

Pint, Bruce A. ^[1]; Unocic, Kinga A. ^[1]; Haynes, James Allen ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

While the water vapor content of the combustion gas in natural gas-fired land-based turbines is ~10%, it can be 20–85% with coal-derived (syngas or H₂) fuels or innovative turbine concepts for more efficient carbon capture. Additional concepts envisage working fluids with high CO₂ contents to facilitate carbon capture and sequestration. To investigate the effects of changes in the gas composition on thermal barrier coating (TBC) lifetime, furnace cycling tests (1-h and 100-h cycles) were performed in air with 10, 50, and 90 vol. % water vapor and CO₂-10% H₂O and compared to prior results in dry air or O₂. Two types of TBCs were investigated: (1) diffusion bond coatings (Pt-diffusion or Pt-modified aluminide) with commercial electron-beam physical vapor-deposited yttria-stabilized zirconia (YSZ) top coatings on second-generation superalloy N5 and N515 substrates and (2) high-velocity oxygen fuel (HVOF) sprayed MCrAlYHfSi bond coatings with air plasma-sprayed YSZ top coatings on superalloys X4, 1483, or 247 substrates. For both types of coatings exposed in 1-h cycles, the addition of water vapor resulted in a decrease in coating lifetime, except for Pt-diffusion coatings which were unaffected by the environment. In 100-h cycles, environment was less critical, perhaps because coating failure was chemical (i.e., due to interdiffusion) rather than mechanical. As a result, in both 1-h and 100-h cycles, CO₂ did not appear to have any negative effect on coating lifetime.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1261544

Journal Information:: Journal of Engineering for Gas Turbines and Power, Vol. 138, Issue 8; ISSN 0742-4795

Publisher:: ASME

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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diffusion (physics)
water vapor
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Title: The effect of environment on thermal barrier coating lifetime

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