win德赢

Abstract: With the global oil and gas industry increasingly targeting ultra-deep well development, the demand for wear resistance in polycrystalline diamond compact (PDC) bits is increasing. However, further improvement of the mechanical properties of PDC incurs prohibitively elevated costs and stringent technological challenges. Here, we present a two-stage high-pressure infiltration (HPI) methodology involving cobalt removal pretreatment followed by lubricant infiltration. The successful infiltration of lubricants into diamond micropores has been systematically verified, and the effects of lubricant phase composition, infiltration pressure, and temperature on infiltration depth have been thoroughly investigated. Fractal dimension analysis characterizes the pore structure of cobalt-removed diamonds, revealing a strong correlation between the fractal dimension and friction coefficient reduction. Tribological testing confirms the formation of lubricating films at friction interfaces, achieving a 71.5% reduction in the coefficient of friction for lubricant-containing diamond materials. This straightforward strategy opens a gate to developing the next generation of self-lubricating diamond materials.