Adaptive-lubricating PEO/Ag/MoS2 multilayered coatings for Ti6Al4V alloy at elevated temperature
| Autor: | Yongkun Qin, Yiran Zou, Jianliang Li, He Yong, Zhang Rongchu, Dangsheng Xiong, Jin Qitong |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Oxide Titanium alloy 02 engineering and technology engineering.material Atmospheric temperature range Tribology Plasma electrolytic oxidation 021001 nanoscience & nanotechnology chemistry.chemical_compound 020303 mechanical engineering & transports 0203 mechanical engineering Coating chemistry Mechanics of Materials lcsh:TA401-492 engineering Silver molybdate lcsh:Materials of engineering and construction. Mechanics of materials General Materials Science Composite material 0210 nano-technology Tribometer |
| Zdroj: | Materials & Design, Vol 107, Iss, Pp 311-321 (2016) |
| ISSN: | 0264-1275 |
| DOI: | 10.1016/j.matdes.2016.06.053 |
| Popis: | To improve the tribological properties of titanium alloy at elevated temperatures, a multilayered lubricating coating was fabricated on the surface of Ti6Al4V alloy, involving an oxide ceramic coating deposited by PEO treatment, an electroplating Ag coating and a burnished MoS2 film. The tribological properties were evaluated by a ball-on-disk high temperature tribometer over a wide temperature range (RT-600 °C). The results showed that the low friction coefficient and high wear resistance were exhibited at room and medium temperatures (350 °C), the oxidation of MoS2 topcoats and the adhesive wear of softened Ag led to the direct contact of Si3N4/exposed oxide underlayer giving rise to the rapid increase of friction coefficient. As the temperature increased to 600 °C, the friction coefficient sharply decreased to a low level ~0.2, which was attributed to a combined effect of the diffused Ag from discharged reservoirs, the presence of high temperature lubricants (MoOx, Ag2MoO4) and the formation of lubricants/lubricating glaze layers contact. Keywords: Plasma electrolytic oxidation, Self-lubricating coating, Friction and wear, Elevated temperature, Silver molybdate, Ti6Al4V |
| Databáze: | OpenAIRE |
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