Research of near-zero-run-in-period low-friction behavior induced by ultrathin graphene nanocrystallite layer

No.51705331

Amorphous carbon film generally undergoes a long high-friction run-in period before reaching the stable low-friction stage. For application of low friction, shortening or eliminating the high-friction run-in period is still an important problem. This project proposes to solve the problem by depositing an ultrathin graphene nanocrystallite layer on the amorphous carbon film. During the friction, the ultrathin graphene nanocrystallite layer will induce the formation of graphene on the contact surface quickly, and the film reaches the low-friction stage with a near-zero-run-in period. Aiming at the scientific problem of “principle of near-zero-run-in-period low-friction behavior induced by ultrathin graphene nanocrystallite layer ”, this application tends to carry out studies in three aspects: triggering low friction with the formation of graphene, regulating near-zero-run-in period with nanocrystallite size, and the low friction mechanism under different friction conditions. More specially: (1) Through testing friction behaviors of the films with a Pin-on-Disk tribometer, and observing the formation of graphene induced by graphene nanocrystallite with Tip-Enhanced Raman Spectroscopy and Double Spherical Aberration-Corrected Transmission Electron Microscope, the triggering of low friction with the formation of graphene is revealed . (2) Through tuning the formation speed of graphene with nanocrystallite size, the regulatory mechanism of near-zero-run-in period is clarified. (3)

Through analyzing the nanostructure evolution of graphene under different friction conditions, and the effect of graphene polycrystalline structure on the low friction behavior is studied, and the near-zero-run-in-period super-low-friction behavior is obtained. The research outcomes provide an new idea for the design and fabrication of near-zero-run-in-period low-friction films.