Wide temperature lubrication of LST/PEO/Ag/MoS₂ multilayer coating

ABSTRACT

The Ag film and MoS₂ film were successively deposited onto the LST/PEO duplex-treated titanium alloy substrate. The friction tests were conducted at 25°C, 350°C and 600°C, respectively. The worn morphologies were analysed by optical microscopy and Raman spectrum. The results showed that the LST/PEO/Ag/MoS₂ coating exhibited more excellent friction behaviour in comparison to the LST/PEO coating at 25–600°C. The combined lubrication of Ag diffused from surface micro-pores and Ag₂MoO₄ formed on the surface is responsible for the decrease of friction coefficient at 600°C. It also revealed that the friction heat can promote the formation of Ag₂MoO₄ in comparison to the high test temperature.

KEYWORDS:

• Plasma electrolytic oxidation
• laser surface texturing
• wide temperature lubrication
• silver molybdate
• Ti6Al4V alloy

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work is financially supported by the National Natural Science Foundation of China [Nos. 51101087, 51575278], Natural Science Foundation of Jiangsu Province [No.BK20151487], the Special Fund for Transformation of Scientific and Technological Achievements of Jiangsu Province [No. BA2015054], and the Scientific Research Foundation for Central Research Institutes [No. Y417003].