Figure 7
Friction coefficient (a) UNCD(6%H2) and (b) UNCD(0%H2) films in ambient and high vacuum (3 × 10−6 mbar) tribology conditions, respectively, with the inset showing optical images of the films exposed for tribology test and arrow marks represents wear tracks. Tribology parameters: Load: 1 N, Sliding speed: 100 rpm (linear speed: 1.04 cm/s), Ball: Al2O3 (6 mm dia).
