Abstract
Prolonging wear life of amorphous carbon films under vacuum was an enormous challenge. In this work, we firstly reported that amorphous carbon film as a lubricant layer containing hydrogen, oxygen, fluorine and silicon (a-C:H:O:F:Si) exhibited low friction (~0.1), ultra-low wear rate (9.0 × 10–13 mm3 N–1 mm–1) and ultra-long wear life (>2 × 106 cycles) under high vacuum. We systematically examined microstructure and composition of transfer film for understanding of the underlying frictional mechanism, which suggested that the extraordinarily excellent tribological properties were attributed to the thermodynamically and structurally stable FeF2 nanocrystallites corroborated using first-principles calculations, which were induced by the tribochemical reaction.
Highlights
For understanding of the underlying friction mechanism
The results showed that the amorphous carbon film, which exhibited low friction (~0.1), ultra-low wear (9.0 × 10–13 mm[3] N–1 mm–1) and ultra-long life (>2 × 106 cycles), was firstly reported under high vacuum
The composition of the amorphous carbon film is estimated by Auger electron spectroscopy (AES), as shown in Figure 2C is the major composition of the film
Summary
For understanding of the underlying friction mechanism. Results for low friction and wear depended on the formation of FeF2 nanocrystallites that induced by tribochemical reaction during sliding. The results showed that the amorphous carbon film, which exhibited low friction (~0.1), ultra-low wear (9.0 × 10–13 mm[3] N–1 mm–1) and ultra-long life (>2 × 106 cycles), was firstly reported under high vacuum.
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