Nano Magnesium silicate hydroxide as synergistic lubricant additive with micro carbon sphere for enhanced tribological properties

Abstract In this study, the tribological properties of the mixture of nano magnesium silicate hydroxide (MSH) and micro carbon sphere (CS) are studied, and a superior synergistic anti-wear performance is exhibited under 600 N and 600 RPM. For determining the anti-wear mechanism, an easy two-step experimental method is innovatively used. It is proved that the decomposition of MSH is the key to exhibit the synergistic anti-wear effect with amorphous carbon (a-C). Results show that the H+ protons released by MSH decomposition can effectively convert Fe2O3 to Fe3O4 on worn surfaces. Besides, MSH also helps the formed a-C layer exist in low H content with stronger adhesion on the iron surface, and the detached H atoms from C–H further facilitate the reduction of Fe2O3. It is believed that the critical role of lamellate clay in synergy with a-C as a lubricant additive is determined, and a basis for the further anti-wear mechanism study of various a-C-modified clay composite is provided.