Fig. 5From: Study of tribological behavior of Cu–MoS2 and Ag–MoS2 nanocomposite lubricantsWear tracks of the steel disk after the friction tests with a Litol + 5 % MoS2, b Litol, c Litol + 5 % (MoS2 + 7 % Ag) d Litol + 5 % (MoS2 + 7 % Cu)Back to article page