Abstract
The tribological properties of polycrystalline diamond compact (PDC) with different matching pairs (Al2O3, ZrO2, and GCr15 balls) in drilling fluid were studied. The friction coefficient, microstructure, wear rate, three-dimensional surface morphology, and transfer behavior of the friction film of different balls and PDC were analyzed experimentally. The results showed that there are significant differences in friction and wear behavior between PDC and different balls in the drilling fluid environment. In addition, the surface of PDC will form a friction-protective film in the presence of drilling fluid. Different friction pairs exhibit different degrees of damage to the protective film and form a transfer film during the friction process. When the protective film on PDC is destroyed, small particles in the drilling fluid can fill the groove area to repair and prevent further friction and wear.
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