Fig. 4
From: Wear-resistant surface coloring by ultrathin optical coatings
Scanning electron images and energy dispersive x-ray maps (Insets) of the scratched areas on TiAlN(30nm)-TiN(50nm) coating (a,b), and on Si(50nm)-Cu(50nm) coating (d,e). The scratch tests were performed by a diamond indenter. Scratch tests on TiAlN-TiN coating (c) and Si-Cu coating (f) by a stainless-steel tweezers