复合Al_2O_3-SiO_2纳米颗粒的摩擦学性能研究

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。

Study on Tribological Properties of Al2O3-SiO2 Composite Nano-particles

Al2O3-SiO2 composite nano-particles were in-situ modified with silane coupling agent,so the monodisperse stability of Al2O3-SiO2 composite 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-SiO2 composite 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.