Fig. 2From: An Investigation on the Tribological Performances of the SiO2/MoS2 Hybrid Nanofluids for Magnesium Alloy-Steel Contacts a Changes in the average friction coefficient as a function of different SiO2/MoS2 mixing ratios. b Evolution of the friction coefficient with the sliding time (8 N, 30 mm/s, 1.5 h)Back to article page