Surface Modified TiO2 Nanoparticles—an Effective Anti-wear and Anti-friction Additive for Lubricating Grease

摘要

The surface modified TiO2 nanoparticles were prepared by using 12-hydroxystearic acid chemically modified on the TiO2 surface. The average size of the TiO2 particles is about 30 nm. The optimum ratio of tetrabutyl titanate to 12-hydroxystearic acid was 1/0.5. The bonding form between 12-hydroxystearic acid and TiO2 nucleus was investigated by FTIR, DSC, TGA and XRD techniques. The lubricating grease containing the surface modified TiO2 nanoparticles possesses excellent anti-wear and anti-friction properties. Compared with the grease without TiO2, the PB value can be increased by 52% as the best performance of the grease containing surface modified TiO2 nanoparticles, while the friction coefficient can be reduced by 33% with the addition of a small amount of TiO2 nanoparticles, and meanwhile the wear scar diameter decreases by 25%.