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Performance of wear resistant MCrAlY coatings with oxide dispersion strengthening
Wear ( IF 5 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.wear.2019.203116
Giovanni Bolelli , Christoph Vorkötter , Luca Lusvarghi , Stefania Morelli , Veronica Testa , Robert Vaßen

Abstract 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).

中文翻译:

氧化物弥散强化耐磨MCrAlY涂层的性能

摘要 为设计合适的高温滑动磨损保护材料,采用真空等离子喷涂(VPS)制造氧化铝弥散强化(ODS)CoNiCrAlY涂层。原料为球磨粉末,Al2O3 含量为 2、10 和 30%(重量)。涂层的球盘滑动磨损行为在 750 °C 下与 Al2O3 对应物进行测试,并与纯 CoNiCrAlY 涂层(从未经球磨的商业原料获得)和未涂层的镍基高温合金进行比较. 滑动磨损率从无涂层高温合金 (≈3 × 10−5 mm3/(N·m)) 到纯 CoNiCrAlY 涂层 (≈2 × 10−5 mm3/(N·m)) 和 ODS 涂层降低,其中含有 10 wt% Al2O3 的样品的显着例外。磨损样品的分析表明纯 CoNiCrAlY 受到严重的粘着磨损,通过压实和(可能的)摩擦氧化碎片颗粒的烧结形成厚(> 1μm)“釉”层来减轻这种情况。在 CoNiCrAlY 基体中添加 Al2O3 颗粒可以增强或恶化“釉料”稳定性。具体而言,用 30 wt% Al2O3 强化的涂层为“釉料”提供了特别好的机械支撑。这产生了有益的效果,导致 ≈3 × 10−6 mm3/(N·m) 的特别低的磨损率。
更新日期:2020-03-01
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