改性纳米TiO_2/SiO_2作为润滑油添加剂的摩擦性能研究

钛酸酯偶联剂改性后的两种纳米颗粒按不同质量分数配比加入基础油中在销盘摩擦磨损机上进行实验。通过实验前后销的磨损量变化和盘表面粗糙度值分析复合纳米添加剂的摩擦磨损性能,并借助扫描电镜和X射线光电子能谱(XPS)检测盘试样表面形貌和元素组成。实验结果表明当基础油中添加1.5%的纳米TiO2和3%的SiO2时,销的质量磨损量为实验前质量的0.85%、表面粗糙度Ra值1.098μm、摩擦系数降低了69.8%,XPS检测到表面含有Ti、Si元素。由于纳米颗粒在摩擦过程中产生了微轴承效应的同时形成了润滑保护膜,从而大大地提高了润滑油的摩擦性能。

Friction Properties of Modified nanoparticles TiO2/SiO2 as Lubricant Additives

Two kinds of nanoparticles modified by titanate coupling agent are added into the base oil with different mass fraction. It is carried on the pin-on-disc friction and wear experiments. The amount of wear on the pins and the surface roughness of the disc before and after the experimental are measured to analysis wear properties of the oil sample. The surface morphology and elemental composition of the disc are chartered by scanning electron microscopy and x-ray photoelectron spectroscopy （XPS）.Experimental results show that the worn of the disk compared with before experiment lost 0.85 %, the surface roughness Ra is 1.098 ~tm, 69.8 % lower friction coefficient when thel.5 % Nano TiO2 and 3 % Nano SiO2 as lubricant additives. At the same time the Ti and Si atom were tbund on the disc. It illustrated that nanoparticles rolled in rubbing surface and formed a protective film on surface, thus the tfibological properties of the lubricating oil is improved greatly.