Effect of increased water vapor levels on TBC lifetime with Pt-containing bond coatings

B. A. Pint; G. W. Garner; T. M. Lowe; J. A. Haynes; Y. Zhang

doi:10.1016/j.surfcoat.2011.06.008

Effect of increased water vapor levels on TBC lifetime with Pt-containing bond coatings

B. A. Pint, G. W. Garner, T. M. Lowe, J. A. Haynes, Y. Zhang

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

To investigate the effect of increased water vapor levels on thermal barrier coating (TBC) lifetime, furnace cycle tests were performed at 1150°C in air with 10vol.% water vapor (similar to natural gas combustion) and 90vol.%. Either Pt diffusion or Pt-modified aluminide bond coatings were applied to specimens from the same batch of a commercial second-generation single-crystal superalloy and commercial vapor-deposited yttria-stabilized zirconia (YSZ) top coats were applied. Three coatings of each type were furnace cycled to failure to compare the average lifetimes obtained in dry O₂, using the same superalloy batch and coating types. Average lifetimes with Pt diffusion coatings were unaffected by the addition of water vapor. In contrast, the average lifetime of Pt-modified aluminide coatings was reduced by more than 50% with 10% water vapor but only slightly reduced by 90% water vapor. Based on roughness measurements from similar specimens without a YSZ coating, the addition of 10% water vapor increased the rate of coating roughening more than 90% water vapor. Qualitatively, the amount of β-phase depletion in the coatings exposed in 10% water vapor did not appear to be accelerated.

Original language	English
Pages (from-to)	1566-1570
Number of pages	5
Journal	Surface and Coatings Technology
Volume	206
Issue number	7
DOIs	https://doi.org/10.1016/j.surfcoat.2011.06.008
State	Published - Dec 25 2011

Funding

The authors would like to thank K. M. Cooley and H. Longmire for assistance with the experimental work. B. Nagaraj at General Electric Aircraft Engines coated the specimens with EB-PVD YSZ. P. F. Tortorelli provided helpful comments on the manuscript. This research was sponsored by the U.S. Department of Energy , Office of Coal and Power R&D, Office of Fossil Energy (R. Dennis program manager). Part of the research was funded by the National Science Foundation -GOALI program under grant no. 0504566 with Tennessee Tech. University.

Funders	Funder number
Office of Coal and Power R&D
Tennessee Tech
National Science Foundation	0504566
U.S. Department of Energy
Office of Fossil Energy

Keywords

High temperature oxidation
Pt aluminide coating
Pt diffusion coating
Thermal barrier coating
Water vapor

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10.1016/j.surfcoat.2011.06.008

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title = "Effect of increased water vapor levels on TBC lifetime with Pt-containing bond coatings",

abstract = "To investigate the effect of increased water vapor levels on thermal barrier coating (TBC) lifetime, furnace cycle tests were performed at 1150°C in air with 10vol.% water vapor (similar to natural gas combustion) and 90vol.%. Either Pt diffusion or Pt-modified aluminide bond coatings were applied to specimens from the same batch of a commercial second-generation single-crystal superalloy and commercial vapor-deposited yttria-stabilized zirconia (YSZ) top coats were applied. Three coatings of each type were furnace cycled to failure to compare the average lifetimes obtained in dry O2, using the same superalloy batch and coating types. Average lifetimes with Pt diffusion coatings were unaffected by the addition of water vapor. In contrast, the average lifetime of Pt-modified aluminide coatings was reduced by more than 50% with 10% water vapor but only slightly reduced by 90% water vapor. Based on roughness measurements from similar specimens without a YSZ coating, the addition of 10% water vapor increased the rate of coating roughening more than 90% water vapor. Qualitatively, the amount of β-phase depletion in the coatings exposed in 10% water vapor did not appear to be accelerated.",

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AU - Garner, G. W.

AU - Lowe, T. M.

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AU - Zhang, Y.

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Effect of increased water vapor levels on TBC lifetime with Pt-containing bond coatings

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