Tribology of Coated 316L SS by Various Nanoparticles

Table 2

Comparison of surface microhardness between 316L SS substrates and various coating materials at different sputtering times using one-way ANOVA.

Variables	1st reading	2nd reading	3rd reading	4th reading	Mean GPa	SD ±	ANOVA
Nb-1 hr	2.26	2.03	2.06	2.15	2.12	0.105	F = 14.783
Nb-2 hrs	2.23	2.45	2.54	2.46	2.42	0.134
Nb-3 hrs	2.18	2.65	2.46	2.53	2.46	0.200
SS	1.90	2.00	1.89	1.85	1.91	0.064
Ta-1 hr	2.42	2.66	2.82	2.91	2.70	0.217	F = 29.580
Ta-2 hrs	2.57	3.03	2.81	2.82	2.81	0.190
Ta-3 hrs	3.08	3.13	2.73	2.90	2.96	0.181
SS	1.90	2.00	1.89	1.85	1.91	0.064
V-1 hr	2.21	2.02	1.96	2.03	2.05	0.109	F = 37.977
V-2 hrs	2.24	2.30	2.34	2.38	2.32	0.061
V-3 hrs	2.33	2.44	2.47	2.44	2.42	0.062
SS	1.90	2.00	1.89	1.85	1.91	0.064
Nb	2.22	2.38	2.35	2.38	2.33	0.075	F = 103.499
Ta	2.69	2.94	2.79	2.88	2.82	0.110
V	2.26	2.25	2.26	2.28	2.26	0.014
SS	1.90	2.00	1.89	1.85	1.91	0.064

The mean difference is significant at the 0.05 level.