Effect of Adding Concentration on Antifriction Properties of Two Additives C and MD2C's lubricant versus wear scar diameter curve. It can be seen that after adding different amounts of MD1C and MD2C, the wear scar diameter of the steel balls under their lubrication is much lower than that of the liquid paraffin lubricant when no lubricant is added: wherein when the mass fraction added is 0.5%, The MD1C wear spot diameter was reduced by 44% compared to liquid paraffin, and the MD2C wear spot diameter was 53% lower than liquid paraffin.
With the further increase of the concentration, the wear scar diameter remained basically unchanged. At the same addition concentration, the wear scar diameter of steel balls containing MD2C additives was smaller than that of MD1C containing oil additives, indicating that the wear resistance of MD2C additives was better than that of MD1C additives. At the same time, it was found that the two kinds of additives with high additive amount have less anti-wear effect than the one with low additive amount. This shows that the addition of organic molybdenum additives can effectively improve the anti-wear performance of the base oil, but the excess additive can improve the Its wear resistance has little effect. It can also be seen in the figure that the two kinds of organic molybdenum additives have the best anti-wear effects when the added mass fraction is 0.5%. With the change trend of MD1C and MD2C addition rates, it can be seen that the friction factors of the MD1C and MD2C all show a significant decrease with the increase of the additive amount and then tend to be stable. The value decreases from 0.1 to about 0.06 and tends to be stable. Compared with liquid paraffin, the friction factor is reduced by an average of 40%. At the same time, the friction factor of the MD2C additive oil lubrication is smaller than that of the MD1C additive oil lubrication, indicating that the friction reduction performance of the MD2C additive is superior to that of the MD1C additive.