Effect of Increased Water Vapor Levels on TBC Lifetime

Pint, Bruce A; Garner, George Walter; Lowe, Tracie M; Haynes, James A; Zhang, Ying

Title: Effect of Increased Water Vapor Levels on TBC Lifetime

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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 10 vol.% water vapor (similar to natural gas combustion) and 90 vol.%. 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 O{sub 2}, 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 {beta}-phase depletion in the coatings exposed in 10% water vapor did not appear to be accelerated.

Authors:

Pint, Bruce A ^[1]; Garner, George Walter ^[1]; Lowe, Tracie M ^[1]; Haynes, James A ^[1]; Zhang, Ying ^[2]

ORNL
Tennessee Technological University

Publication Date:: Sat Jan 01 00:00:00 EST 2011

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

Sponsoring Org.:: FE USDOE - Office of Fossil Energy (FE)

OSTI Identifier:: 1030614

DOE Contract Number:: DE-AC05-00OR22725

Resource Type:: Conference

Resource Relation:: Conference: ICMCTF, San Diego, CA, USA, 20110502, 20110506

Country of Publication:: United States

Language:: English

Subject:: 03 NATURAL GAS; 36 MATERIALS SCIENCE; AIR; COATINGS; COMBUSTION; DIFFUSION; DIFFUSION COATINGS; FURNACES; HEAT RESISTING ALLOYS; LIFETIME; NATURAL GAS; ROUGHNESS; THERMAL BARRIERS; THIN FILMS; WATER VAPOR; Thermal barrier coatings; water vapor; oxidation

Citation Formats


                    Pint, Bruce A, Garner, George Walter, Lowe, Tracie M, Haynes, James A, and Zhang, Ying. Effect of Increased Water Vapor Levels on TBC Lifetime.  United States: N. p., 2011. 
        Web.

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                    Pint, Bruce A, Garner, George Walter, Lowe, Tracie M, Haynes, James A, & Zhang, Ying. Effect of Increased Water Vapor Levels on TBC Lifetime.  United States.

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                    Pint, Bruce A, Garner, George Walter, Lowe, Tracie M, Haynes, James A, and Zhang, Ying. 2011.  
        "Effect of Increased Water Vapor Levels on TBC Lifetime".  United States.

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@article{osti_1030614,

  title        = {Effect of Increased Water Vapor Levels on TBC Lifetime},

  author       = {Pint, Bruce A and Garner, George Walter and Lowe, Tracie M and Haynes, James A and Zhang, Ying},

  abstractNote = {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 10 vol.% water vapor (similar to natural gas combustion) and 90 vol.%. 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 O{sub 2}, 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 {beta}-phase depletion in the coatings exposed in 10% water vapor did not appear to be accelerated.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/1030614},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sat Jan 01 00:00:00 EST 2011},

  month        = {Sat Jan 01 00:00:00 EST 2011}

}

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