Effect of temperature on the friction behavior and mechanism of DLC film in CO 2 foam fracturing environment

PH Xu and YH Liu and LG Liu, TRIBOLOGY INTERNATIONAL, 198, 109927 (2024).

DOI: 10.1016/j.triboint.2024.109927

Diamond-like carbon (DLC) film is considered to be an attractive candidate material for reducing friction and wear in oil and gas equipment due to its low friction and high wear resistance. This study investigated the evolution of friction interfaces and tribochemical reaction at three different temperatures through reactive molecular dynamics simulations. The results reveal that the synergistic effect of atomic transfer layer and chemical passivation of DLC film leads to the decrease of friction force with increasing ambient temperature. The cumulative atomic transfer layer with increasing ambient temperature also contributes to the increase of wear amount, while the atomic lattice transition dominates friction temperatures. More importantly, the phenomenon of increased sp 3 carbon atoms in DLC film is also temperature dependent.

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