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Friction and wear behaviors of diamond-like carbon (DLC) film in humid N 2 (RH-100%) sliding against different counterpart ball (Si 3 N 4 ball, Al 2 O 3 ball and steel ball) were investigated. It was found that the friction and wear behaviors of DLC film were dependent on the friction-induced tribochemical interactions in the presence of the DLC film, water molecules and counterpart balls. When sliding against Si 3 N 4 ball, a tribochemical film that mainly consisted of silica gel was formed on the worn surface due to the oxidation and hydrolysis of the Si 3 N 4 ball, and resulted in the lowest friction coefficient and wear rate of the DLC film. The degradation of the DLC film catalyzed by Al 2 O 3 ball caused the highest wear rate of DLC film when sliding against Al 2 O 3 ball, while the tribochemical reactions between DLC film and steel ball led to the highest friction coefficient when sliding against steel ball.

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