摘要：以硅烷偶联剂为改性剂对复合Al₂O₃-SiO₂纳米颗粒进行原位改性,实现其在润滑油中均匀稳定的单分散。将改性后的复合Al₂O₃-SiO₂纳米颗粒分别按质量分数为0、0.05%、0.1%、0.5%、1.0%的量加入到润滑油中制成试样,进行四球试验和止推圈试验。对摩擦实验中的摩擦系数、磨斑直径、磨损量、摩擦副表面形貌进行分析。结果表明:当复合Al₂O₃-SiO₂纳米颗粒添加质量分数为0.5%时,摩擦系数和磨斑直径最小,止推圈的磨损量出现负磨损,摩擦表面的磨痕明显的变浅、变窄。说明摩擦过程中,复合Al₂O₃-SiO₂纳米颗粒沉积在摩擦副表面,形成一层保护膜有效的保护了摩擦表面,抗磨减摩作用显著。

关键词： 纳米复合颗粒；润滑油；摩擦性能

Abstract：Al₂O₃-SiO₂ composite nano-particles were in-situ modified with silane coupling agent， so the monodisperse stability of Al₂O₃-SiO₂composite nano-particles as lubricant oil additives was realized. The modified Al₂O₃-SiO₂ composite nano-particles were made into five samples， that is， pure lubricant oil and lubricant oil with mass fraction of 0.05%， 0.1%， 0.5%， 1.0% nano-particles respectively， then the four-ball test and thrust-ring test were carried on. The friction coefficient， wear scar diameter， the quality of wear and the morphology of thrust ring were analyzed. It was found that when the concentration of additive was 0.5%， the friction coefficient and wear scar diameter were the smallest， the wear quality of thrust-ring was negative， and the scratches of the wear surface were became more narrow and shallow. This illustrated that the Al₂O₃-SiO₂composite nano-particles formed a film on the surface in the process of friction， and the effect of anti-friction and anti-wear was very significant. 

Keywords： composite nano-particles； lubricant； tribological property