The effect of bond coating surface modification on the performance of atmospheric plasma spray thermal barrier coatings

Kane, Kenneth; Lance, Michael J.; Sweet, M.; Pint, Bruce A.

doi:10.1016/j.surfcoat.2019.125042

Title: The effect of bond coating surface modification on the performance of atmospheric plasma spray thermal barrier coatings

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Abstract

Asperities in atmospheric plasma sprayed (APS) CoNiCrAlY bond coatings were observed to rapidly form spinel-type oxides growing into the APS yttria-stabilized zirconia (YSZ) top coating during isothermal exposures. To minimize these transient oxides, bond coatings were either lightly or heavily modified to remove asperities, prior to top coating deposition. After a 100 h isothermal exposure at 1100 °C in dry air, modified regions formed a thin, Al-rich thermally grown oxide (TGO) scale while unmodified regions formed Cr- and Ni-rich transient oxide. However, in 1-h furnace cycle testing (FCT) at 1100 °C, the modified bond coatings showed a reduced average lifetime compared to the specimens with unmodified bond coatings. The benefit of asperities may be to geometrically inhibit crack propagation, but the volume of transient oxide formed may also densify the adjacent YSZ and further inhibit cracking.

Authors:

Kane, Kenneth ^[1];

^[1]; Sweet, M. ^[2];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Praxair Surface Technologies, Indianapolis, IN (United States)

Publication Date:: Mon Nov 25 00:00:00 EST 2019

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

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

OSTI Identifier:: 1607142

Alternate Identifier(s):: OSTI ID: 1576658

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Surface and Coatings Technology

Additional Journal Information:: Journal Volume: 378; Journal Issue: C; Journal ID: ISSN 0257-8972

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Atmospheric plasma spray (APS); Thermal barrier coating (TBC)Thermally grown oxide (TGO); CoNiCrAlY; Surface modification; Surface engineering

Citation Formats


                    Kane, Kenneth, Lance, Michael J., Sweet, M., and Pint, Bruce A. The effect of bond coating surface modification on the performance of atmospheric plasma spray thermal barrier coatings.  United States: N. p., 2019. 
Web.  doi:10.1016/j.surfcoat.2019.125042.

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                    Kane, Kenneth, Lance, Michael J., Sweet, M., & Pint, Bruce A. The effect of bond coating surface modification on the performance of atmospheric plasma spray thermal barrier coatings.  United States.  https://doi.org/10.1016/j.surfcoat.2019.125042

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                    Kane, Kenneth, Lance, Michael J., Sweet, M., and Pint, Bruce A. Mon .  
"The effect of bond coating surface modification on the performance of atmospheric plasma spray thermal barrier coatings".  United States.  https://doi.org/10.1016/j.surfcoat.2019.125042.  https://www.osti.gov/servlets/purl/1607142.

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@article{osti_1607142,

  title        = {The effect of bond coating surface modification on the performance of atmospheric plasma spray thermal barrier coatings},

  author       = {Kane, Kenneth and Lance, Michael J. and Sweet, M. and Pint, Bruce A.},

  abstractNote = {Asperities in atmospheric plasma sprayed (APS) CoNiCrAlY bond coatings were observed to rapidly form spinel-type oxides growing into the APS yttria-stabilized zirconia (YSZ) top coating during isothermal exposures. To minimize these transient oxides, bond coatings were either lightly or heavily modified to remove asperities, prior to top coating deposition. After a 100 h isothermal exposure at 1100 °C in dry air, modified regions formed a thin, Al-rich thermally grown oxide (TGO) scale while unmodified regions formed Cr- and Ni-rich transient oxide. However, in 1-h furnace cycle testing (FCT) at 1100 °C, the modified bond coatings showed a reduced average lifetime compared to the specimens with unmodified bond coatings. The benefit of asperities may be to geometrically inhibit crack propagation, but the volume of transient oxide formed may also densify the adjacent YSZ and further inhibit cracking.},

  doi          = {10.1016/j.surfcoat.2019.125042},

  journal      = {Surface and Coatings Technology},

  number       = C,

  volume       = 378,

  place        = {United States},

  year         = {Mon Nov 25 00:00:00 EST 2019},

  month        = {Mon Nov 25 00:00:00 EST 2019}

}

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