This article presents the experimental evaluation of rheological characteristics of graphene-gear oil (SAE EP-90) nanolubricant under varying concentration, temperature and shear rates.The nanolubricant samples have been prepared at concentrations varying from 0.3% to 1.8%. Aging test confirms good stability of the prepared nanolubricant samples even after an interval of 50 days. The rheological properties of the samples have been investigated over a temperature range of 25–80 °C and shear rate of 10–200 (1/s). Central Composite Design (CCD) of response surface methodology (RSM) was used for the experimental framework. A combination of concentration, temperature, shear rate (1.00594%, 25.0053 °C, 88.0967 (1/s)) yielded the maximum value of viscosity i.e. 396.113 mPa.s whereas the set (0.58333%, 65.5 °C, 118 (1/s)) gave the minimum value of viscosity i.e. 15.87 mPa s using Response Surface Methodology (RSM). A mathematical correlation with R² (0.9919) has been proposed to predict the relative viscosity of the nanolubricant using analysis of variance (ANOVA) which resembles closely with the experimental data (least deviation 0.256%).

本文介绍了石墨烯齿轮油 (SAE EP-90) 纳米润滑剂在不同浓度、温度和剪切速率下的流变特性的实验评估。纳米润滑剂样品的制备浓度为 0.3% 至 1.8%。老化测试证实，即使间隔 50 天，所制备的纳米润滑剂样品仍具有良好的稳定性。已在 25–80 °C 的温度范围和 10–200 (1/s) 的剪切速率下研究了样品的流变特性。响应面方法 (RSM) 的中心复合设计 (CCD) 用于实验框架。浓度、温度、剪切速率 (1.00594%, 25.0053 °C, 88.0967 (1/s)) 的组合产生了粘度的最大值，即 396.113 mPa.s 而设置 (0.58333%, 65.5 °C, 118 (1/s)) 给出了使用响应面方法 (RSM) 的最低粘度值，即 15.87 mPa s。与 R 的数学相关性² (0.9919) 已被提议使用方差分析 (ANOVA) 来预测纳米润滑剂的相对粘度，该分析与实验数据非常相似（最小偏差 0.256%）。