Regression Analysis of the Effect of Bias Voltage on Nano- and Macrotribological Properties of Diamond-Like Carbon Films Deposited by a Filtered Cathodic Vacuum Arc Ion-Plating Method

Table 3

Sliding damage and specific wear rate (nm²/N).

	DC				Pulse				Ground	Floating
	−50 V	−100 V	−150 V	−200 V	−0.5 kV	−1.0 kV	−1.5 kV	−2.0 kV	0 V	0 V
Dry	○	○	○	○	○	○	○	△	△	○
								0.21	0.20
Oil	○	○	○	△	×	×	×	×	×	△
				0.61	6.54	9.26	8.88	8.20	6.76	0.24
Water	×	△	△	△	×	×	×	×	×	×
	1.35	0.62	0.86	0.38	5.0	1.80	2.42	1.46	6.92	5.28

○: damage free; △: less damage; ×: severe damage.