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Title: Some effects of metallic substrate composition on degradation of thermal barrier coatings

Abstract

Comparisons have been made in laboratory isothermal and cyclic oxidation tests of the degradation of oxide scales grown on single crystal superalloy substrates and bond coating alloys intended for use in thermal barrier coatings systems. The influence of desulfurization of the superalloy and bond coating, of reactive element addition to the bond coating alloy, and of oxidation temperature on the spallation behavior of the alumina scales formed was assessed from oxidation kinetics and from SEM observations of the microstructure and composition of the oxide scales. Desulfurization of nickel-base superalloy (in the absence of a Y addition) resulted in an increase in the lifetime of a state-of-the-art thermal barrier coating applied to it compared to a Y-free, non-desulfurized version of the alloy. The lifetime of the same ceramic coating applied without a bond coating to a non-desulfurized model alloy that formed an ideal alumina scale was also found to be at least four times longer than on the Y-doped superalloy plus state-of-the-art bond coating combination. Some explanations are offered of the factors controlling the degradation of such coatings.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States); USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
663557
Report Number(s):
ORNL/CP-95674; CONF-9709183-
ON: DE98001909; BR: ED2001000;KC0201010; TRN: AHC29818%%395
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Technical Report
Resource Relation:
Conference: High temperature surface engineering conference, Edinburgh (United Kingdom), 22-24 Sep 1997; Other Information: PBD: [1997]
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; OXIDATION; NICKEL BASE ALLOYS; PROTECTIVE COATINGS; DESULFURIZATION; SCALING; REACTION KINETICS; TEMPERATURE RANGE 1000-4000 K; EXPERIMENTAL DATA

Citation Formats

Wright, I.G., Pint, B.A., Lee, W.Y., Alexander, K.B., and Pruessner, K. Some effects of metallic substrate composition on degradation of thermal barrier coatings. United States: N. p., 1997. Web. doi:10.2172/663557.
Wright, I.G., Pint, B.A., Lee, W.Y., Alexander, K.B., & Pruessner, K. Some effects of metallic substrate composition on degradation of thermal barrier coatings. United States. doi:10.2172/663557.
Wright, I.G., Pint, B.A., Lee, W.Y., Alexander, K.B., and Pruessner, K. Wed . "Some effects of metallic substrate composition on degradation of thermal barrier coatings". United States. doi:10.2172/663557. https://www.osti.gov/servlets/purl/663557.
@article{osti_663557,
title = {Some effects of metallic substrate composition on degradation of thermal barrier coatings},
author = {Wright, I.G. and Pint, B.A. and Lee, W.Y. and Alexander, K.B. and Pruessner, K.},
abstractNote = {Comparisons have been made in laboratory isothermal and cyclic oxidation tests of the degradation of oxide scales grown on single crystal superalloy substrates and bond coating alloys intended for use in thermal barrier coatings systems. The influence of desulfurization of the superalloy and bond coating, of reactive element addition to the bond coating alloy, and of oxidation temperature on the spallation behavior of the alumina scales formed was assessed from oxidation kinetics and from SEM observations of the microstructure and composition of the oxide scales. Desulfurization of nickel-base superalloy (in the absence of a Y addition) resulted in an increase in the lifetime of a state-of-the-art thermal barrier coating applied to it compared to a Y-free, non-desulfurized version of the alloy. The lifetime of the same ceramic coating applied without a bond coating to a non-desulfurized model alloy that formed an ideal alumina scale was also found to be at least four times longer than on the Y-doped superalloy plus state-of-the-art bond coating combination. Some explanations are offered of the factors controlling the degradation of such coatings.},
doi = {10.2172/663557},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 31 00:00:00 EST 1997},
month = {Wed Dec 31 00:00:00 EST 1997}
}

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