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Title: High-temperature behavior of oxide dispersion strengthening CoNiCrAlY

Abstract

To fabricate oxide dispersion strengthened bond coatings, commercial Co–30wt-%Ni–20Cr–8Al–0•4Y powder was milled with 2% additions of Al2O3, Y2O3 or Y2O3 + HfO2. Low-pressure plasma sprayed, free-standing specimens were oxidised in air + 10%H2O at 1100 °C both isothermally (100 h) and in 500, 1-h cycles. Dry air cyclic testing conducted at both ORNL and FZJ showed remarkably similar results. In general, the water vapour addition caused more scale spallation. Two LPPS specimens without oxide additions were tested for comparison. The specimens with 2%Al2O3 addition exhibited the best behaviour as the powder already contained 0•4%Y. Additions of 2%Y2O3 and especially 1%Y2O3 + 1%HfO2 resulted in over-doping as evidenced by high mass gains and the formation of Y- and Hf-rich pegs. Scanning transmission electron microscopy of the isothermal specimens showed no Hf and/or Y segregation to the alumina scale grain boundaries in the over-doped specimens.

Authors:
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [1];  [5];  [5]
  1. ORNL
  2. Forschungszentrum Jülich GmbH
  3. Institute for Energy and Climate Research, IEK-2, Forschungszentrum Jülich GmbH
  4. Forschungszentrum Julich GmbH (Julich Research Centre), Germany
  5. Forschungszentrum Julich, Germany
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1424456
DOE Contract Number:
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Journal Volume: 35; Journal Issue: 1-3; Conference: Microscopy of Oxidation 10th International Conference - Loughborough, , United Kingdom - 4/3/2017 4:00:00 AM-4/5/2017 4:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Unocic, Kinga A., Bergholz, Jan, Huang, T, Naumenko, Dymtro, Pint, Bruce A., Vaßen, Robert, and Quadakkers, Willem Joseph. High-temperature behavior of oxide dispersion strengthening CoNiCrAlY. United States: N. p., 2017. Web. doi:10.1080/09603409.2017.1389423.
Unocic, Kinga A., Bergholz, Jan, Huang, T, Naumenko, Dymtro, Pint, Bruce A., Vaßen, Robert, & Quadakkers, Willem Joseph. High-temperature behavior of oxide dispersion strengthening CoNiCrAlY. United States. doi:10.1080/09603409.2017.1389423.
Unocic, Kinga A., Bergholz, Jan, Huang, T, Naumenko, Dymtro, Pint, Bruce A., Vaßen, Robert, and Quadakkers, Willem Joseph. Wed . "High-temperature behavior of oxide dispersion strengthening CoNiCrAlY". United States. doi:10.1080/09603409.2017.1389423. https://www.osti.gov/servlets/purl/1424456.
@article{osti_1424456,
title = {High-temperature behavior of oxide dispersion strengthening CoNiCrAlY},
author = {Unocic, Kinga A. and Bergholz, Jan and Huang, T and Naumenko, Dymtro and Pint, Bruce A. and Vaßen, Robert and Quadakkers, Willem Joseph},
abstractNote = {To fabricate oxide dispersion strengthened bond coatings, commercial Co–30wt-%Ni–20Cr–8Al–0•4Y powder was milled with 2% additions of Al2O3, Y2O3 or Y2O3 + HfO2. Low-pressure plasma sprayed, free-standing specimens were oxidised in air + 10%H2O at 1100 °C both isothermally (100 h) and in 500, 1-h cycles. Dry air cyclic testing conducted at both ORNL and FZJ showed remarkably similar results. In general, the water vapour addition caused more scale spallation. Two LPPS specimens without oxide additions were tested for comparison. The specimens with 2%Al2O3 addition exhibited the best behaviour as the powder already contained 0•4%Y. Additions of 2%Y2O3 and especially 1%Y2O3 + 1%HfO2 resulted in over-doping as evidenced by high mass gains and the formation of Y- and Hf-rich pegs. Scanning transmission electron microscopy of the isothermal specimens showed no Hf and/or Y segregation to the alumina scale grain boundaries in the over-doped specimens.},
doi = {10.1080/09603409.2017.1389423},
journal = {},
number = 1-3,
volume = 35,
place = {United States},
year = {Wed Nov 01 00:00:00 EDT 2017},
month = {Wed Nov 01 00:00:00 EDT 2017}
}

Conference:
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