Fabrication of oxide dispersion strengthened bond coats with low Al2O3 content [Fabrication of ODS bond coats with low Al2O3 content]

Bergholz, Jan; Pint, Bruce A.; Unocic, Kinga A.; VaBen, Robert

doi:10.1007/s11666-017-0550-9

Title: Fabrication of oxide dispersion strengthened bond coats with low Al₂O₃ content [Fabrication of ODS bond coats with low Al₂O₃ content]

Journal Article · 23 March 2017 · Journal of Thermal Spray Technology

DOI: https://doi.org/10.1007/s11666-017-0550-9 · OSTI ID:1366405

Bergholz, Jan ^[1]; Pint, Bruce A. ^[2]; Unocic, Kinga A. ^[2]; VaBen, Robert ^[1]

Forschungszentrum Julich GmbH, Julich (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Nuclear Science User Facility (NSUF)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1366405

Journal Information:: Journal of Thermal Spray Technology, Vol. 26, Issue 5; ISSN 1059-9630

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Oxide Dispersion Strengthened Bond Coats with Higher Alumina Content: Oxidation Resistance and Influence on Thermal Barrier Coating Lifetime Vorkötter, C.; Hagen, S. P.; Pintsuk, G. Oxidation of Metals, Vol. 92, Issue 3-4 https://doi.org/10.1007/s11085-019-09931-z	journal	July 2019

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36 MATERIALS SCIENCE
thermal barrier coatings
bond coating
ODS
processing
mechanical alloying
oxide dispersion strengthened
process control agent
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Title: Fabrication of oxide dispersion strengthened bond coats with low Al2O3 content [Fabrication of ODS bond coats with low Al2O3 content]

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Title: Fabrication of oxide dispersion strengthened bond coats with low Al₂O₃ content [Fabrication of ODS bond coats with low Al₂O₃ content]