%0 Journal Article
%A Bolelli, Giovanni
%A Vorkötter, Christoph
%A Lusvarghi, Luca
%A Morelli, Stefania
%A Testa, Veronica
%A Vaßen, Robert
%T Performance of wear resistant MCrAlY coatings with oxide dispersion strengthening
%J Wear
%V 444-445
%@ 0043-1648
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2019-05488
%P 203116
%D 2020
%X 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).
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000513001800001
%R 10.1016/j.wear.2019.203116
%U https://juser.fz-juelich.de/record/866332