油酸甘油酯摩擦改进剂与金属摩擦界面的作用机制研究

为探究油酸甘油酯(GMO)在润滑油中作为摩擦改进剂的减摩作用机理，采用球-盘往复式摩擦磨损试验机考察了含有GMO聚α烯烃(PAO6)润滑油的摩擦磨损行为，利用扫描电子显微镜、激光扫描显微镜以及拉曼光谱等，分析了磨痕的表面形貌及成分. 结果表明，特定条件下摩擦表面会生成由GMO参与反应的碳基薄膜，从而使得摩擦系数与磨损率大幅降低，摩擦状态逐渐平稳. 同时，对基体表面GMO分子的吸附过程进行了分子模拟. 结果显示，GMO分子中存在多个活性位点，C=C和C=O处的原子化学活性较高. 在摩擦过程中，酯基与摩擦表面形成化学吸附，为脱氢反应提供1个稳态环境，脱氢后的碳链富集于基体表面，从而形成碳基薄膜.

To investigate the friction-reducing mechanism of glyceryl monooleate (GMO) as a friction modifier in lubricating oils, the friction and wear behavior of polyalphaolefin (PAO6) lubricating oil containing GMO was examined using a ball-on-disk reciprocating friction and wear tester. The surface morphology and composition of the wear scars were analyzed via scanning electron microscope (SEM), laser scanning microscope (LSM), Raman spectroscopy, and other characterization techniques. The results demonstrate that under specific conditions, a carbon-based film generated through the reaction involving GMO forms on the friction surface, which significantly reduces the friction coefficient and wear rate while gradually stabilizing the friction state. Meanwhile, molecular simulations were conducted to explore the adsorption process of GMO molecules on the substrate surface. The simulation results reveal that multiple active sites are present in GMO molecules, with the atoms at the C=C and C=O groups showing high chemical reactivity. During the friction process, the ester groups form chemical adsorption with the friction surface, providing a stable environment for the dehydrogenation reaction. The dehydrogenated carbon chains accumulate on the substrate surface, thus forming the carbon-based film.

搜集汇总

背景与挑战

背景概述

该数据集研究了油酸甘油酯（GMO）作为摩擦改进剂在金属摩擦界面中的作用机制，通过实验和分子模拟方法，发现GMO能在特定条件下形成碳基薄膜，显著降低摩擦系数和磨损率，并揭示了其分子活性位点（如C=C和C=O）在化学吸附和薄膜形成中的关键作用。数据集属于摩擦学领域，包含实验数据和分析结果，发布时间为2023年9月，数据量较小（4.23 MB），关键词包括摩擦改进剂、边界润滑、摩擦薄膜、减摩和分子模拟。