Tribological Properties and Lubrication Mechanism of Biomimetic Rectangular Micro/Nanogrid Structures of Mechanical Transmission Sliding Plates

To optimize the tribological properties of a mechanical transmission skateboard, rectangular micro/nanogrid structures of different sizes are studied. The reciprocating sliding tests are carried out under friction and wear. The results show that with an increase in the lengths from 330 to 484 μm and widths from 247 to 363 μm of the grid structures, the friction coefficients and wear rates first decrease and then increase. This results in the smallest friction coefficient and wear rate of the TCSC-G-4 with 440 μm length and 330 μm width. This is because the micro/nanogrid structures provide the lubricant SnAgCu-CaF2 (SC), which is sufficient for lubrication film formation. During wear, SnAgCu deformation and CaF2 rolling lead to mixed lubrication that is dominated by the rolling, sliding and roller–sliding, enhancing the plastic flow of the lubrication film for surface repair. This is of great significance for guiding the bionic tribological designs of the skateboard.