Research On Noise Property Of Grease Filled With Nano Particles

Now, the grease is widely applied to lubracating all kinds of machinery. Because it assumes semisolid, which can be conveniently used. With the development of industry and technology, a lot of equipment demands lower noise. It is a kind of simple and economical method, by improving the performance of grease to ruduce the noise. Accompanying nanometer tribology appearing, the nano particles have shown good performance as the additive. Therefore, it is practically value in application to studying the nanoparticles'effect on bearing noise.In this paper, lithium and ureido-dcarbamido grease are select as basic grease. Nano calcium carbonate, silicon dioxide, titanium dioxide, Teflon and nano calcium carbonate blending with thulium are selected as additive. Then 52 groups of grease samples are tested the value of noise and recorded the phenomena of noise. Experiments have shown that surface-modified calcium carbonate have better effect on noise than unmodified. It is also suggested that different nanoparticles are able to improve the noise value to a certain extent in proper concentration. Nano particles of silicon dioxide and titanium dioxide, which have small dimension, can get across the contact area. So they have lower noise at the beginning of running. Besides, grease's samples prepared by four nanoparticles separately added to lithium or ureido-dcarbamido grease are tested the tribological properties. Grease's samples that four nanoparticles separately added to ureido-dcarbamido grease are tested Apparent voscosity. The results show that high frequency has some relations of wear rate. And the proper values of apparent viscosity have good effect on noise.Lubricating mechanism of different nano particles was primarily revealed by SEM and EDAX. Calcium carbonate and silicon dioxide nanoparticles are ascribe to the release and furnishing onto the metal surface and their confinement at the interface. It is expected that the spherical shape of nanoparticles facilitate their sliding between the rubbed surfaces, liking ball bearing to play effect. Teflon can be due to the film in a surface which has a little frictional coefficient, low shear strength and high compressive strength. Titanium dioxide nanoparticles have active surface, and strongly adsorbability, so they can form nanoparticles'film to protect the surface from destroying. The blended nanoparticles be able to cooperate with different nanoparticles effect.