Research On Tribological Performance Of Ureido-Dcarbamido Grease Filled With Nano Particles

Currently, more than 80% of the rolling bearings are lubricated with grease, and the performance of the grease depends largely on the performance of the additives. With the development of modern industry, many machines are operated in the situations of high-temperature, high-speed, automation, and so on, and noise pollution, environmental protection and other factors must also considered, which set higher demands on lubricating grease. Since ureido-Dcarbamido grease with high dripping temperature, long life, withstand high temperatures, high-speed, anti-water, it has broad industrial applications, but the ability of resisting high pressure is not well which limit its development more or less.This article proposed an idea of using nanometer science and technology to change the property of the grease .we added the nano particles into the grease, and dispersed them uniformly and stably, to make different products which contain kinds of content. We filtered more than 11 nano particles from the results of the long-time friction tests, and focused on three kinds of prescriptions which have outstanding performance. Experiments have shown that the nano silicon dioxide particles, nano Teflon particles and calcium carbonate/rare earth compound particles have good performance on reducing the friction and resisting the wear. In addition, this article also researched the friction marks of steel ball after long-time friction tests with SEM images and spectrum analysis, and summarized the principle how to reduce friction and wear of three prescriptions. The nanometer silicon dioxide's principle is"micro rolling bearing" effect, and nanometer Teflon is due to the film in a surface which has low shear strength and high compressive strength, the nano calcium carbonate is due to the effect cooperate with "micro rolling bearing" effect, sediment film and effect of intensify layer in the surface. Test results showed 1% silicon dioxide, PTFE3% and calcium carbonate complex prescriptions(calcium carbonate and rare earth compound particles are both 1%)have good effect on reducing the friction and wear, and has prominent role in industrial applications of high value.