二氧化钛微球合成、表面修饰及摩擦学性能

Synthesis and tribological properties of surface modified TiO_2 microspheres

引言由于纳米材料在光学、电学和磁学方面的特殊性质以及在高科技领域的巨大应用潜力,引起人们广泛的关注和研究[1-4]。特别是在摩擦学领域,众多的无机纳米材料成功地应用于润滑油脂添加剂、

Anatase TiO2 microspheres with uniform morphology and high crystallinity were 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,and were kept unchanged for several months under ambient conditions.It could be reasonably inferred that the modified TiO2,because of long chain carboxylic acid on its surface,possessed a more effective improvement of its 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）.In addition,the possible formation mechanism was discussed.The tribological properties of the as-prepared samples as an additive to liquid paraffin base oil were evaluated by a four-ball tester.The experimental results demonstrated that the as-prepared samples had an excellent anti-wear effect,friction-reduction property and could significantly improve the load-carrying capacity of liquid paraffin.