TY  - JOUR
AU  - Bolelli, Giovanni
AU  - Vorkötter, Christoph
AU  - Lusvarghi, Luca
AU  - Morelli, Stefania
AU  - Testa, Veronica
AU  - Vaßen, Robert
TI  - Performance of wear resistant MCrAlY coatings with oxide dispersion strengthening
JO  - Wear
VL  - 444-445
SN  - 0043-1648
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2019-05488
SP  - 203116
PY  - 2020
AB  - 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).
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000513001800001
DO  - DOI:10.1016/j.wear.2019.203116
UR  - https://juser.fz-juelich.de/record/866332
ER  -