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Title: Fabrication of oxide dispersion strengthened bond coats with low Al 2O 3 content [Fabrication of ODS bond coats with low Al 2O 3 content]

Here, nanoscale oxide dispersions have long been used to increase the oxidation and wear resistance of alloys used as bond coatings in thermal barrier coatings. Their manufacturing via mechanical alloying is often accompanied by difficulties regarding their particle size, homogeneous distribution of the oxide dispersions inside the powder, involving considerable costs, due to cold welding of the powder during milling. A significant improvement in this process can be achieved by the use of process control agent (PCA) to achieve the critical balance between cold welding and fracturing, thereby enhancing the process efficiency. In this investigation, the influence of the organic additive stearic acid on the manufacturing process of Al 2O 3-doped CoNiCrAlY powder was investigated. Powders were fabricated via mechanical alloying at different milling times and PCA concentrations. The results showed a decrease in particle size, without hindering the homogeneous incorporation of the oxide dispersions. Two powders manufactured with 0.5 and 1.0 wt.% PCA were deposited by high velocity oxygen fuel (HVOF) spraying. Results showed that a higher content of elongated particles in the powder with the higher PCA content led to increased surface roughness, porosity and decreased coating thickness, with areas without embedded oxide particles.
Authors:
 [1] ;  [2] ;  [2] ;  [1]
  1. Forschungszentrum Julich GmbH, Julich (Germany)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Thermal Spray Technology
Additional Journal Information:
Journal Volume: 26; Journal Issue: 5; Journal ID: ISSN 1059-9630
Publisher:
Springer
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Nuclear Science User Facility (NSUF)
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; thermal barrier coatings; bond coating; ODS; processing; mechanical alloying; oxide dispersion strengthened; process control agent; thermal spraying
OSTI Identifier:
1366405

Bergholz, Jan, Pint, Bruce A., Unocic, Kinga A., and VaBen, Robert. Fabrication of oxide dispersion strengthened bond coats with low Al2O3 content [Fabrication of ODS bond coats with low Al2O3 content]. United States: N. p., Web. doi:10.1007/s11666-017-0550-9.
Bergholz, Jan, Pint, Bruce A., Unocic, Kinga A., & VaBen, Robert. Fabrication of oxide dispersion strengthened bond coats with low Al2O3 content [Fabrication of ODS bond coats with low Al2O3 content]. United States. doi:10.1007/s11666-017-0550-9.
Bergholz, Jan, Pint, Bruce A., Unocic, Kinga A., and VaBen, Robert. 2017. "Fabrication of oxide dispersion strengthened bond coats with low Al2O3 content [Fabrication of ODS bond coats with low Al2O3 content]". United States. doi:10.1007/s11666-017-0550-9. https://www.osti.gov/servlets/purl/1366405.
@article{osti_1366405,
title = {Fabrication of oxide dispersion strengthened bond coats with low Al2O3 content [Fabrication of ODS bond coats with low Al2O3 content]},
author = {Bergholz, Jan and Pint, Bruce A. and Unocic, Kinga A. and VaBen, Robert},
abstractNote = {Here, nanoscale oxide dispersions have long been used to increase the oxidation and wear resistance of alloys used as bond coatings in thermal barrier coatings. Their manufacturing via mechanical alloying is often accompanied by difficulties regarding their particle size, homogeneous distribution of the oxide dispersions inside the powder, involving considerable costs, due to cold welding of the powder during milling. A significant improvement in this process can be achieved by the use of process control agent (PCA) to achieve the critical balance between cold welding and fracturing, thereby enhancing the process efficiency. In this investigation, the influence of the organic additive stearic acid on the manufacturing process of Al2O3-doped CoNiCrAlY powder was investigated. Powders were fabricated via mechanical alloying at different milling times and PCA concentrations. The results showed a decrease in particle size, without hindering the homogeneous incorporation of the oxide dispersions. Two powders manufactured with 0.5 and 1.0 wt.% PCA were deposited by high velocity oxygen fuel (HVOF) spraying. Results showed that a higher content of elongated particles in the powder with the higher PCA content led to increased surface roughness, porosity and decreased coating thickness, with areas without embedded oxide particles.},
doi = {10.1007/s11666-017-0550-9},
journal = {Journal of Thermal Spray Technology},
number = 5,
volume = 26,
place = {United States},
year = {2017},
month = {3}
}