Effect of Addition of Montmorillonite and Indium Composite Powder on Tribological Properties of 45 Steel Friction Pairs

The oil soluble modified montmorillonite (MMT)/indium (In) composite nanoscale powders were prepared into four disperse systems by adding 1%, 2%, 3% and 4% to the base oil respectively. The friction properties of the 45 steel samples were tested by MMU-10G friction and wear testing machine, and the surface composition of the samples was analyzed by SEM and EDX. The mechanism that affects the tribological properties is compared and analyzed. The results show that the wear weight loss of the sample added with MMT/In nano powder is smaller than that in the base oil, and the average friction factor of the sample with 3% additions is 43.14% ,lower than that of the base oil, and the total wear is negative weightlessness.EDX analysis showed that the surface of the friction specimen was composed of Mg, Al and In repair membranes. The main mechanism of anti friction and friction reduction is that the composite powder will form a repair film on the surface of the friction pair during the friction process, and the repair layer can reduce the friction, compensate for the wear and play the role of resisting wear and reducing the effect of friction. With the increase of adding amount, the repair layer is gradually improved and the tribological performance is enhanced. But if the amount of addition is too high, the micro cutting and furrow effect of a large number of hard particles on the matrix and the new film will be greater than the compensation effect of the repair film, making the antiwear and antifriction properties decrease.