Tribological behaviours of black phosphorus/MoS<sub>2</sub> composites as water‐based lubrication additives
Wei Wang, Shaowen Dong, Yuan Gao, Guoliang Zhang, Kuaishe Wang
Abstract
Abstract In this investigation, a self‐assembly method was used to fabricate black phosphorus (BP)/MoS 2 composites as water‐based lubrication additives. The tribological behaviours of the lubrication additives for GCr15 steel ball/TC4 titanium alloy disk contact under different mass ratios, loads and rotational speeds were also investigated. The experimental results showed that 0.01 wt.% BP and 0.04 wt.% MoS 2 as water‐based lubrication additive have the best the synergistic lubrication effect. Compared with pure water, coefficient of friction (COF) and wear rate of the lubrication additive at the test conditions of 8 N and 150 r/min were reduced by 32.6% and 68.8%, respectively. As the loads increased, the COFs and wear rates of all the lubricants including pure water, BP as water‐based lubrication additive (BP‐WL), MoS 2 as water‐based lubrication additive (MS‐WL) and BP/MoS 2 composites as water‐based lubrication additive (BM‐WL) were all reduced. As the rational speeds increased from 100 to 250 r/min, all the lubricants were firstly decreased and then increased. Based on tribological tests and wear surface analysis, the lubrication mechanism of BM‐WL is proposed. The interlaminar shear and the adsorption of BP/MoS 2 composites on the wear surface of the friction pairs are the key to reducing COFs sand wear rates. In addition, the tribo‐chemical reaction films consists of FeO/Fe 2 O 3 , Al 2 O 3 and TiO 2 were formed during the friction process, which can effectively protect the surface of the titanium alloy/steel contact from wear.