Direct Formation of Lubricious and Wear-Protective Carbon Films from Phosphorus- and Sulfur-Free Oil-Soluble Additives
Direct Formation of Lubricious and Wear-Protective Carbon Films from Phosphorus- and Sulfur-Free Oil-Soluble Additives
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DOI：
10.1007/s11249-017-0945-2
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发表时间：
2018-03
影响因子：
3.2
通讯作者：
Blake Johnson;Hongxing Wu;Hongxing Wu;Michael Desanker;David B. Pickens;Y. Chung;Q. J. Wang
中科院分区：
文献类型：
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作者：
Blake Johnson;Hongxing Wu;Hongxing Wu;Michael Desanker;David B. Pickens;Y. Chung;Q. J. Wang
极压 (EP) 润滑剂添加剂利用接触和相对运动的热量和压力在接触部位形成保护性摩擦膜。常见的极压添加剂含有磷和硫等不良元素。提出了一种不含磷和硫的新型极压润滑油添加剂，用于生成润滑碳膜。该添加剂由具有亚稳态环烷环的表面活性分子组成，在摩擦接触过程中很容易解离，形成润滑的碳膜。含有该添加剂的 PAO4 在一定负载和速度范围内的摩擦和磨损性能均优于不含添加剂的 PAO4。使用光学和扫描电子显微镜以及拉曼光谱分析测试后接触表面上形成的摩擦膜，为碳膜的形成提供直接证据。分析了碳摩擦膜形成的定量动力学作为温度和应力的函数，从中获得了碳摩擦膜形成的活化能。
Extreme pressure (EP) lubricant additives form protective tribofilms at the site of contact using the heat and pressure of contact and relative motion. Common EP additives contain undesirable elements such as phosphorus and sulfur. A novel EP lubricant additive, which contains no phosphorus and sulfur, is presented for generating lubricious carbon films. The additive consists of a surface-active molecule with a metastable cycloalkane ring, which dissociates readily during tribological contact to form lubricious carbon films. Friction and wear performance of PAO4 with this additive under a range of loads and speeds were shown to be superior to that without the additive. Optical and scanning electron microscopy and Raman spectroscopy were used to analyze the tribofilms formed on post-test contact surfaces, providing direct evidence for the formation of carbon films. Quantitative kinetics for the carbon tribofilm formation was analyzed as a function of temperature and stress, from which the activation energy for carbon tribofilm formation was obtained.