Mechanical and Tribological Properties of Carbon-Based Graded Coatings

Table 1

Summary of the mechanical and tribological properties of single coatings and the substrate.

Material	[GPa]	[GPa]	CoF	10^−6 [mm^3/Nm]
Steel substrate AISI 304	4	190	0.5	560
Cr	8	180	0.7	200
Cr/Cr2N	15.7	228	0.5	3.9
Cr/a-C:H	18.4	280	0.4	2.2
Cr/a-C:H,N	15.7	143	0.22	0.65
a-C:N	12	120	0.1	3.8

Results of nanoindentation tests (Berkovich indenter, 2 mN max. load)
Results of tribological tests (ball-on-disc, 6 mm Al₂O₃ ball, 1 N load).