Study on the Performance of Different Crystal Forms Nano MoS2 as Lubricant Additives in Reducing Wear and Friction

In order to investigate the anti-friction and anti-wear performance of different crystal forms nano MoS₂ in paraffin oil. Freeze-drying method combined with hydrothermal was used to prepare different crystal forms nano MoS₂ and their microstructures were characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The anti-friction and anti-wear performance of MoS₂ nanoparticles as lubricat additives under different working conditions was investigated by the ball-and-disk friction and wear testing machine and the mechanism of friction and wear reduction was investigated. The results showed that the thickness of the floral sheet MoS₂ flakes was about 10 nm and the particle size of the spherical MoS₂ was about 90 nm. When the addition concentration was 3 wt%, the friction coefficient of the floral sheet MoS₂ in paraffin oil was lower at 0.094, which was 29.3% lower than that of the pure paraffin oil, the width of the abrasion marks was 24.2% lower than that of the pure paraffin oil and the wear rate was 71.6% lower than that of the pure paraffin oil; The friction coefficient of the spherical MoS₂ with 2.5 wt% addition was 0.082, which was 38.3% lower than the friction coefficient of pure paraffin oil, 24.1% lower than that of paraffin oil in terms of wear scar width and 81.9% lower than that of paraffin oil in terms of wear rate.