Engineering-Grade Macroscale Superlubricity Under Ultrahigh Contact Pressure in Atmospheric Air via Multiscale...

Friction is responsible for a substantial fraction of global energy dissipation, limiting the efficiency and longevity of moving machinery. While structural superlubricity, a state of near-zero friction originating from incommensurability, has been demonstrated at the nanoscale, its extension to engineering-grade applications remains a significant challenge. This scaling gap is primarily driven by "edge-pinning" effects, interfacial deformations under high loads that disrupt lattice incommensurability, and the presence of grain boundaries that serve as reactive sites for tribochemical oxidation in humid air. Here, we propose an across-scale synergistic strategy that bridges macroscale contacts to atomic lattices by patterning random macroscale contacts into controllable amorphous/crystalline meta-interfaces. By integrating laser-textured pillars coated with high-rigidity diamond-like carbon (DLC) and a reinforced MoS₂-MXene composite, we establish an interface where the amorphous DLC ensures persistent incommensurability and resists out-of-plane deformation. Simultaneously, the high-strength MXene phase serves as a protective scaffold to maintain MoS₂ crystal integrity and suppresses oxidation. Our findings demonstrate a robust superlubricity regime with a friction coefficient of 0.008 sustained over 100 000 laps under extreme coupled conditions: millimeter-scale contact size, 12.7 GPa contact pressure, and 40% relative humidity. This design paradigm extends structural superlubricity from nanoscale model systems to practical technologies for sustainable engineering.