关键词: 二氧化钛, 表面修饰, 摩擦学性能

Abstract: Anatase TiO2 microspheres with uniform morphology and high crystallinity were facilely synthesized through a solvothermal method. The as-prepared samples were surface modified by stearic acid, and the as-prepared samples through surface modification could be readily dispersed in common non-polar solvents and mineral oils to obtain homogenous solutions, these homogenous solutions keeped unchanged for several months in ambient conditions. It could be reasonably inferred that the modified TiO2, because of a lot of long chains carboxylic acids on its surface, possessed a more effective improvement of the dispersity in liquid paraffin. The crystallographic structure, crystallite size, and surface morphology of as-prepared samples were analyzed through powder X-ray diffraction spectra (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetry (TGA) respectively. In addition, the possible formation mechanism was discussed. The tribological properties of the as-prepared samples as an addictive of liquid paraffin were evaluated by a four-ball tester. The experimental results demonstrated that the as-prepared samples had excellent an anti-wear effect, friction-reduction property and could significantly improve the load-carrying capacity of liquid paraffin.

Key words: TiO2, surface modification, tribological property