Synthesis and tribological properties of NbSe_3 nanofibers and NbSe_2 microsheets

摘要

NbSe_3 nanofibers and NbSe_2 sheets were prepared by solid state reaction. The as-prepared products are characterized by powder X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results showed that the obtained NbSe_3 nanofibers have a diameter in the range of 100-300 nm and length about 10 ?m, while the NbSe_2 sheets have a hexagon structure. The tribological properties of the as-prepared NbSe _x powders as additives in HVI500 base oil were investigated on UMT-2 multispecimen tribo-tester. The wear scars were measured by VEECO WYKO NT1100 non-contact optical profile testing instrument. It is found that the addition of both NbSe_x nanofibers/sheets improves the tribological properties of base oil. Furthermore, NbSe_2 sheets exhibit better friction reduction and wear resistance properties than NbSe_3 nanofibers in HVI500 base oil.