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Title: The Effect of Coating Composition and Geometry on Thermal Barrier Coatings Lifetime

Abstract

Several factors are being investigated that affect the performance of thermal barrier coatings (TBC) for use in land-based gas turbines where coatings are mainly thermally sprayed. This study examined high velocity oxygen fuel (HVOF), air plasma-sprayed (APS), and vacuum plasma-sprayed (VPS) MCrAlYHfSi bond coatings with APS YSZ top coatings at 900–1100 °C. For superalloy 247 substrates and VPS coatings tested in 1 h cycles at 1100 °C, removing 0.6 wt %Si had no effect on average lifetime in 1 h cycles at 1100 °C, but adding 0.3%Ti had a negative effect. Rod specimens were coated with APS, HVOF, and HVOF with an outer APS layer bond coating and tested in 100 h cycles in air + 10%H 2O at 1100 °C. With an HVOF bond coating, initial results indicate that 12.5 mm diameter rod specimens have much shorter 100 h cycle lifetimes than disk specimens. Furthermore, much longer lifetimes were obtained when the bond coating had an inner HVOF layer and outer APS layer.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1484121
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Engineering for Gas Turbines and Power
Additional Journal Information:
Journal Volume: 141; Journal Issue: 3; Journal ID: ISSN 0742-4795
Publisher:
ASME
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Coatings; Cycles; Disks; Coating processes; Thermal barrier coatings

Citation Formats

Pint, Bruce A., Lance, Michael J., and Haynes, James Allen. The Effect of Coating Composition and Geometry on Thermal Barrier Coatings Lifetime. United States: N. p., 2018. Web. doi:10.1115/1.4041309.
Pint, Bruce A., Lance, Michael J., & Haynes, James Allen. The Effect of Coating Composition and Geometry on Thermal Barrier Coatings Lifetime. United States. doi:10.1115/1.4041309.
Pint, Bruce A., Lance, Michael J., and Haynes, James Allen. Thu . "The Effect of Coating Composition and Geometry on Thermal Barrier Coatings Lifetime". United States. doi:10.1115/1.4041309.
@article{osti_1484121,
title = {The Effect of Coating Composition and Geometry on Thermal Barrier Coatings Lifetime},
author = {Pint, Bruce A. and Lance, Michael J. and Haynes, James Allen},
abstractNote = {Several factors are being investigated that affect the performance of thermal barrier coatings (TBC) for use in land-based gas turbines where coatings are mainly thermally sprayed. This study examined high velocity oxygen fuel (HVOF), air plasma-sprayed (APS), and vacuum plasma-sprayed (VPS) MCrAlYHfSi bond coatings with APS YSZ top coatings at 900–1100 °C. For superalloy 247 substrates and VPS coatings tested in 1 h cycles at 1100 °C, removing 0.6 wt %Si had no effect on average lifetime in 1 h cycles at 1100 °C, but adding 0.3%Ti had a negative effect. Rod specimens were coated with APS, HVOF, and HVOF with an outer APS layer bond coating and tested in 100 h cycles in air + 10%H2O at 1100 °C. With an HVOF bond coating, initial results indicate that 12.5 mm diameter rod specimens have much shorter 100 h cycle lifetimes than disk specimens. Furthermore, much longer lifetimes were obtained when the bond coating had an inner HVOF layer and outer APS layer.},
doi = {10.1115/1.4041309},
journal = {Journal of Engineering for Gas Turbines and Power},
issn = {0742-4795},
number = 3,
volume = 141,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 4, 2019
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