Synergistic effect of V and Ag diffusion favored the temperature-adaptive tribological behavior of VAlN/Ag multi-layer coating.
In: Tribology International, Jg. 192 (2024-04-01), S. N.PAG
academicJournal
Zugriff:
Surface coating technology offers several benefits (excellent wear resistance, low coefficient of friction-COF, better corrosion durability etc.) for key components used in harsh aero-engines. However, the development of temperature-adaptive lubricant coating is still the crucial issue. In this study, VAlN/Ag multi-layer coatings with various thickness ratios were fabricated by a hybrid deposition system composing of DCMS and HiPIMS techniques. Results showed that all coatings presented Ag layers with growth twins, and fcc-VAlN layers with columnar structure. Increasing the temperature from 25 to 650 ℃ led to a decrease of COF from 0.47 to 0.22 in coatings, where the lowest COF and wear rate was particularly achieved at 0.08 and 4.3 × 10−5 mm3N−1m−1 under higher rotation speed, respectively. Based on the microstructural characterizations on wear track of coating and wear scar of counter ball, the synergistic diffusion of V and Ag elements at elevating temperature stimulated the in-situ formation of distinctive Al 2 O 3 /AgVO 3 -Ag 3 VO 4 /Ag microstructure, which encompass lubricant phases for lower COF and high wear resistance. The reason behind of this phenomena could be attributed to the easily broken of Ag-O bonds in lamellar silver vanadium oxides at high temperature, accompanying the remarkable lubrication of Ag on top layer. • The VAlN/Ag multilayer coatings were fabricated using DCMS-HiPIMS technology. • Coatings consist of Ag layer with growth twins and VAlN layer with fcc columnar crystal. • A specifically lowest COF of 0.08 obtained at higher rotation speed. • Synergistic diffusion of V/Ag stimulates the Al 2 O 3 /AgVO 3 -Ag 3 VO 4 /Ag formed in-situ. • Coating demonstrated excellent temperature-adaptive tribological behavior from 25 to 650 ℃. [ABSTRACT FROM AUTHOR]
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Synergistic effect of V and Ag diffusion favored the temperature-adaptive tribological behavior of VAlN/Ag multi-layer coating.
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Autor/in / Beteiligte Person: | Zhang, Yupeng ; Wang, Zhenyu ; Zhou, Shenghao ; Zhang, Yan ; Dong, Yufeng ; Wang, Aiying ; Ke, Peiling |
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Zeitschrift: | Tribology International, Jg. 192 (2024-04-01), S. N.PAG |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 0301-679X (print) |
DOI: | 10.1016/j.triboint.2024.109285 |
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