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Title: Effect of Superalloy Substrate and Bond Coating on TBC Lifetime

Abstract

Several different single-crystal superalloys were coated with different bond coatings to study the effect of composition on the cyclic oxidation lifetime of an yttria-stabilized zirconia (YSZ) top coating deposited by electron beam physical vapor deposition from a commercial source. Three different superalloys were coated with a 7 {micro}m Pt layer that was diffused into the surface prior to YSZ deposition. One of the superalloys, N5, was coated with a low activity, Pt-modified aluminide coating and Pt-diffusion coatings with 3 and 7 {micro}m of Pt. Three coatings of each type were furnace cycled to failure in 1 h cycles at 1150 C to assess average coating lifetime. The 7 {micro}m Pt diffusion coating on N5 had an average YSZ coating lifetime >50% higher than a Pt-modified aluminide coating on N5. Without a YSZ coating, the Pt-modified aluminide coating on N5 showed the typical surface deformation during cycling, however, the deformation was greatly reduced when constrained by the YSZ coating. The 3 {micro}m Pt diffusion coating had a similar average lifetime as the Pt-modified aluminide coating but a much wider scatter. The Pt diffusion bond coating on superalloy X4 containing Ti exhibited the shortest YSZ coating lifetime, this alloy-coating combination also showedmore » the worst alumina scale adhesion without a YSZ coating. The third generation superalloy N6 exhibited the longest coating lifetime with a 7 {micro}m Pt diffusion coating.« less

Authors:
 [1];  [1];  [2]
  1. ORNL
  2. Tennessee Technological University
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
FE USDOE - Office of Fossil Energy (FE)
OSTI Identifier:
1000295
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: ICMCTF, San Diego, CA, USA, 20100426, 20100430
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADHESION; COATINGS; DEFORMATION; DEPOSITION; DIFFUSION; DIFFUSION COATING; ELECTRON BEAMS; FURNACES; HEAT RESISTING ALLOYS; LIFETIME; OXIDATION; PHYSICAL VAPOR DEPOSITION; SUBSTRATES; Thermal Barrier Coating; Aluminide; Alumina; Pt diffusion; Coating

Citation Formats

Pint, Bruce A, Haynes, James A, and Zhang, Ying. Effect of Superalloy Substrate and Bond Coating on TBC Lifetime. United States: N. p., 2010. Web.
Pint, Bruce A, Haynes, James A, & Zhang, Ying. Effect of Superalloy Substrate and Bond Coating on TBC Lifetime. United States.
Pint, Bruce A, Haynes, James A, and Zhang, Ying. 2010. "Effect of Superalloy Substrate and Bond Coating on TBC Lifetime". United States. doi:.
@article{osti_1000295,
title = {Effect of Superalloy Substrate and Bond Coating on TBC Lifetime},
author = {Pint, Bruce A and Haynes, James A and Zhang, Ying},
abstractNote = {Several different single-crystal superalloys were coated with different bond coatings to study the effect of composition on the cyclic oxidation lifetime of an yttria-stabilized zirconia (YSZ) top coating deposited by electron beam physical vapor deposition from a commercial source. Three different superalloys were coated with a 7 {micro}m Pt layer that was diffused into the surface prior to YSZ deposition. One of the superalloys, N5, was coated with a low activity, Pt-modified aluminide coating and Pt-diffusion coatings with 3 and 7 {micro}m of Pt. Three coatings of each type were furnace cycled to failure in 1 h cycles at 1150 C to assess average coating lifetime. The 7 {micro}m Pt diffusion coating on N5 had an average YSZ coating lifetime >50% higher than a Pt-modified aluminide coating on N5. Without a YSZ coating, the Pt-modified aluminide coating on N5 showed the typical surface deformation during cycling, however, the deformation was greatly reduced when constrained by the YSZ coating. The 3 {micro}m Pt diffusion coating had a similar average lifetime as the Pt-modified aluminide coating but a much wider scatter. The Pt diffusion bond coating on superalloy X4 containing Ti exhibited the shortest YSZ coating lifetime, this alloy-coating combination also showed the worst alumina scale adhesion without a YSZ coating. The third generation superalloy N6 exhibited the longest coating lifetime with a 7 {micro}m Pt diffusion coating.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2010,
month = 1
}

Conference:
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