Influences of Nano-Silica on Friction and Noise Properties of Urea Grease
Tribological properties of the urea grease containing nano-silica were investigated with a four-ball tester, and its noise characteristics were evaluated with a BVT-1 bearing vibration tester. The results showed that the nano-silica has good effects on friction and wear resistances, the urea grease with 3% nano-silica has the least value of friction coefficient, and the urea grease with 2% nano-silica showed the best wear resistance. A proper amount of nano-silica can decrease the noise of the urea grease, and when lubricated by the grease with 1% nano-silica, the bearing achieved its lowest noise level as well as the best velocity values of both intermediate and high frequencies.
Daizhong Su, Qingbin Zhang and Shifan Zhu
J. H. Yin et al., "Influences of Nano-Silica on Friction and Noise Properties of Urea Grease", Key Engineering Materials, Vol. 450, pp. 189-193, 2011