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

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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 ... continued below

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20 p.

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Wright, I. G.; Pint, B. A.; Lee, W. Y.; Alexander, K. B. & Pruessner, K. December 1997.

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Description

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.

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20 p.

Notes

OSTI as DE98001909

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  • High temperature surface engineering conference, Edinburgh (United Kingdom), 22-24 Sep 1997

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  • Other: DE98001909
  • Report No.: ORNL/CP--95674
  • Report No.: CONF-9709183--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/663557 | External Link
  • Office of Scientific & Technical Information Report Number: 663557
  • Archival Resource Key: ark:/67531/metadc707683

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  • December 1997

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 17, 2015, 4:01 p.m.

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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, report, December 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc707683/: accessed May 28, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.