Figure 4
From: Tribochemistry of adaptive integrated interfaces at boundary lubricated contacts

SEM images of the worn CrN + GLC ring surfaces (a,b,c and d) and the cast iron contacts (e,f,g and h) in oil lubrication: (a,e) 1 h; (c,f) 2 h; (c,g) 4 h; (d,h) 8 h.