Figure 9
Raman spectra at various locations: of (ai and bi) wear track and (aii and bii) ball scar in the sliding combination of UNCD(6%H2)/Al2O3 (ai and aii), and (bi and bii) UNCD(0%H2)/Al2O3; tribology parameters: High vacuum (3 × 10−6 mbar), Load: 1 N, Sliding speed: 100 rpm (linear speed: 1.04 cm/s), Ball: Al2O3 (6 mm dia.), sliding cycles 5 × 104.
