This title appears in the Scientific Report :
2020
Please use the identifier:
http://hdl.handle.net/2128/24022 in citations.
Please use the identifier: http://dx.doi.org/10.1016/j.wear.2019.203116 in citations.
Performance of wear resistant MCrAlY coatings with oxide dispersion strengthening
Performance of wear resistant MCrAlY coatings with oxide dispersion strengthening
Aiming to devise suitable materials for sliding wear protection at high temperature, aluminium oxide-dispersion strengthened (ODS) CoNiCrAlY coatings were manufactured by vacuum plasma spraying (VPS). Feedstock materials were ball-milled powders with 2, 10 and 30 wt% Al2O3 content. The ball-on-disc...
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Personal Name(s): | Bolelli, Giovanni (Corresponding author) |
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Vorkötter, Christoph / Lusvarghi, Luca / Morelli, Stefania / Testa, Veronica / Vaßen, Robert | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | Wear, 444-445 (2020) S. 203116 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2020
|
DOI: |
10.1016/j.wear.2019.203116 |
Document Type: |
Journal Article |
Research Program: |
Methods and Concepts for Material Development |
Link: |
Published on 2019-11-08. Available in OpenAccess from 2021-11-08. Published on 2019-11-08. Available in OpenAccess from 2021-11-08. |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1016/j.wear.2019.203116 in citations.
Aiming to devise suitable materials for sliding wear protection at high temperature, aluminium oxide-dispersion strengthened (ODS) CoNiCrAlY coatings were manufactured by vacuum plasma spraying (VPS). Feedstock materials were ball-milled powders with 2, 10 and 30 wt% Al2O3 content. The ball-on-disc sliding wear behaviour of the coatings was tested at 750 °C against an Al2O3 counterpart, and compared to a pure CoNiCrAlY coating (obtained from a commercial feedstock not subjected to ball milling) and to an uncoated Ni-base superalloy.Sliding wear rates decrease from the uncoated superalloy (≈3 × 10−5 mm3/(N·m)) to the pure CoNiCrAlY coating (≈2 × 10−5 mm3/(N·m)) and to the ODS ones, with the notable exception of the 10 wt% Al2O3-containing sample.Analyses of worn samples indicate that pure CoNiCrAlY is subject to severe adhesive wear, mitigated by the formation of a thick (>1 μm) “glaze” layer via compaction and (probable) sintering of tribo-oxidized debris particles. Addition of Al2O3 particles to the CoNiCrAlY matrix can either enhance or worsen the “glaze” stability. Specifically, a coating strengthened with 30 wt% Al2O3 provides an especially good mechanical support to the “glaze”. This produces beneficial effects resulting in a particularly low wear rate of ≈3 × 10−6 mm3/(N·m). |