Preparation and Tribological Properties of Dual-Coated TiO2 Nanoparticles as Water-Based Lubricant Additives
Figure 8
AFM analysis of the worn surface of steel ball after four-ball test lubricated by the water with 1.6 vt.% TiO2 nanoparticles with ultrasonic washing for 5 minutes (a) height image; (b) phase image.