Lubrication by Chemical Reaction Products at Sliding Interface

滑动界面处的化学反应产物润滑

• 批准号: 1435766
• 负责人: Seong Kim
• 金额: $ 35万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1435766&HistoricalAwards=false
• 关键词: Lubrication; Chemical; Reaction; Products; Sliding

Sliding and rubbing interfaces of machineries, whether they are big or small, need lubrication to mitigate friction and wear for reliable operation. Otherwise, these interfaces are bound to fail eventually. The last defense of the sliding interface from such failure is boundary lubrication layers which are chemically or physically adhered to solid surfaces. This layer can be applied to the tribological interface before the assembly and full operation of mechanical devices, or formed in-situ during the operation of the devices. This work focuses on in-situ synthesis of boundary lubrication films directly at the sliding interfaces during the device operation. This research can generate a new lubricant additive chemistry which can reduce parasitic frictional energy losses for automobile industries. This work could also revive the microscale electromechanical technology requiring reliable operations of moving and sliding structural components. This project will train students with multidisciplinary skills covering surface science, molecular characterization and imaging, and tribology; these students will make substantial contributions to newly emerging nano-engineering fields as well as traditional lubrication sectors. The research outcome will be incorporated into a graduate surface characterization course and disseminated through to a broad range of science and engineering fields covering chemistry, chemical engineering, mechanical engineering, materials science, and tribology.Mechanochemical reactions readily occur at all length scales; however, key parameters governing the reaction yield and selectivity are not well documented or understood. This study aims at advancing mechanistic understanding of mechanochemical reactions that can produce reliable boundary lubrication films with complementary properties such as low interfacial shear and high load-bearing. Two specific systems to be studied are (i) mechanochemical polymerization of unsaturated alcohols and esters adsorbed from the vapor phase for synthesis of multilayer films of polyols and polyolesters and (ii) ferrocene-catalyzed mechanochemical reactions of organic precursors in lubricant oils and their graphitization at the sliding interface. This work will undertake systematic studies to understand how contact pressure, shear rate, structure of reactant molecules, and chemistry of substrate materials affect the mechanochemical reaction yield and selectivity as well as the lubrication properties of the produced films. The outcome of this study will not only make breakthroughs in surface engineering for extreme-condition lubrications, but also advance fundamental knowledge of tribochemistry which is still empirical and qualitative.

滑动和摩擦机器的界面，无论是大还是小，都需要润滑以减轻摩擦和磨损以进行可靠的操作。否则，这些界面必然会最终失败。滑动界面免受这种故障的最后防御是边界润滑层，这些层是化学或物理上粘附在固体表面上的。该层可以在组装和机械设备的完全操作之前应用于摩擦学接口，或在设备操作过程中形成原位。这项工作重点是直接在设备操作期间在滑动界面的边界润滑膜的原位合成。这项研究可以产生一种新的润滑剂添加剂化学，可以减少汽车行业的寄生摩擦能源损失。这项工作还可以恢复微观机电技术，需要进行移动和滑动结构组件的可靠操作。该项目将培训涵盖表面科学，分子表征和成像以及摩擦学的多学科技能的学生；这些学生将为新兴新兴的纳米工程领域以及传统润滑领域做出重大贡献。研究结果将纳入研究生表面表征课程中，并通过涵盖化学，化学工程，机械工程，材料科学和摩擦学的各种科学和工程领域进行分布。但是，控制反应产量和选择性的关键参数尚未得到充分记录或理解。这项研究旨在推进对机械反应的机械理解，这些反应可以产生可靠的边界润滑膜具有互补特性，例如低界面剪切和高负载。要研究的两个特定系统是（i）不饱和醇和酯的机械化学聚合，从蒸气期吸附了多元和多晶剂的多层膜以及（ii）（ii）在润滑油和其图形界面的有机体的二型多层膜的合成。这项工作将进行系统研究，以了解接触压力，剪切速率，反应物分子的结构以及底物材料的化学如何影响机械化学反应的产量和选择性以及生产膜的润滑特性。这项研究的结果不仅将在极端条件润滑的表面工程方面取得突破，而且还可以提高对跨质体的基本知识，这仍然是经验和定性的。