Sliding wear of a self-mated thermally sprayed chromium oxide coating in a simulated PWR water environment

Vilma Ratia, Deen Zhang, Jaimie L. Daure, Philip H. Shipway (Corresponding Author), D. Graham McCartney, David A. Stewart

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Bearing surfaces in the primary circuit of pressurised water reactors (PWR) are prone to damage due to aggressive chemical and tribological conditions under which they operate, and a wide range of materials have been examined in this regard. One of the most promising candidates is chromium oxide in the form of a thermally spayed coating, and in this work, the behaviour of a commercially available Cr2O3 coating in self-mated sliding was considered. Tests consisted of a number of start-stop cycles of sliding between a crowned pin and a rotating disc in a water environment in an autoclave in an attempt to simulate the most aggressive phase of bearing run-up and run-down. Wear and damage mechanisms were examined at temperatures from ambient up to 250 °C (a representative PWR environment). Samples were characterised before and after wear testing using mass measurements, profilometry, X-ray diffraction, scanning and transmission electron microscopy (SEM and TEM) and X-ray photoelectron spectroscopy (XPS).

Across the temperature range, wear was mild, with no evidence of coating delamination. A five-fold increase in wear was observed between 80 °C and 250 °C (with wear depths of generally less than 8 µm being observed on the disc samples even at the higher temperature), despite there being only very small changes in hardness of the coating over the same temperature range. Debris was observed on the wear tracks following testing, with the evidence together suggesting that this debris was a very fine-grained mixture of Cr2O3 and amorphous γ-CrOOH, a corrosion product of Cr2O3.
Original languageEnglish
Pages (from-to)1466-1473
Number of pages8
JournalWear
Volume426-427
Issue numberPart B
DOIs
Publication statusPublished - Apr 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

pressurized water reactors
chromium oxides
Pressurized water reactors
sliding
Chromium
Wear of materials
coatings
Coatings
Oxides
Water
Bearings (structural)
water
debris
Debris
Transmission electron microscopy
damage
Temperature
transmission electron microscopy
Scanning electron microscopy
scanning electron microscopy

Keywords

  • ceramic
  • tribocorrosion
  • nuclear
  • surface engineering
  • chromia
  • Cr2O3

Cite this

Ratia, V., Zhang, D., Daure, J. L., Shipway, P. H., McCartney, D. G., & Stewart, D. A. (2019). Sliding wear of a self-mated thermally sprayed chromium oxide coating in a simulated PWR water environment. Wear, 426-427(Part B), 1466-1473. https://doi.org/10.1016/j.wear.2018.12.058
Ratia, Vilma ; Zhang, Deen ; Daure, Jaimie L. ; Shipway, Philip H. ; McCartney, D. Graham ; Stewart, David A. / Sliding wear of a self-mated thermally sprayed chromium oxide coating in a simulated PWR water environment. In: Wear. 2019 ; Vol. 426-427, No. Part B. pp. 1466-1473.
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Ratia, V, Zhang, D, Daure, JL, Shipway, PH, McCartney, DG & Stewart, DA 2019, 'Sliding wear of a self-mated thermally sprayed chromium oxide coating in a simulated PWR water environment', Wear, vol. 426-427, no. Part B, pp. 1466-1473. https://doi.org/10.1016/j.wear.2018.12.058

Sliding wear of a self-mated thermally sprayed chromium oxide coating in a simulated PWR water environment. / Ratia, Vilma; Zhang, Deen; Daure, Jaimie L.; Shipway, Philip H. (Corresponding Author); McCartney, D. Graham; Stewart, David A.

In: Wear, Vol. 426-427, No. Part B, 04.2019, p. 1466-1473.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Ratia, Vilma

AU - Zhang, Deen

AU - Daure, Jaimie L.

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AU - McCartney, D. Graham

AU - Stewart, David A.

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