CAREER: Lamellar Lubricity - Linking Structure, Properties and Tribological Performance of Molybdenum Disulphide

职业：层状润滑性 - 连接二硫化钼的结构、特性和摩擦学性能

• 批准号: 1752109
• 负责人: Brandon Krick
• 金额: $ 50万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2020-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1752109&HistoricalAwards=false
• 关键词: CAREER; Lamellar; Lubricity; Linking; Structure

This Faculty Early Career Development (CAREER) Program grant supports fundamental studies of the friction and wear processes of the important dry, non-oil-based, solid lubricant materials that are critical for use in harsh environments, including space. The work serves to promote our scientific base of understanding of the mechanism of lubrication aiding in the further development of dry lubricants. These lubricants are critical to our national defense and prosperity by impacting the many commercial applications where poor lubrication can lead to wear that limits the machine lifetime and wastes energy. The research will use atom-level tools to understand surface structure of these dry lubricants, with an emphasis on MoS2 which is the most important dry lubricants in use. This lubricant fails in use through the development of defects and a defect structure within the MoS2. To determine the evolution of this defect structure, samples will undergoing controlled wear in the laboratory or will have been exposed to the environment of space on the international space station (ISS) for an extended time. The changes in friction and lubricating properties together with the atomic level structure will be ascertained. This information will generate the basic understanding of the defect formation process aiding in the design of new lubricants and additives with extended lifetime in all environments. The outreach and education features include an integrated research/education plan to increase education, exposure and interest in tribology at all levels of society, with hands-on K-12 outreach activities, curriculum development, and student undergraduate and graduate research experiences.Experiments, advanced characterization and models will probe the links between structure, processing, properties and tribological performance of MoS2 coatings for extreme environments (including space). The technical program is centered 2 research themes: 1) assess the role of molybdenum disulphide microstructure and composition in preventing chemical and tribological degradation during exposure to oxidative and humid environments; 2) understand the energetics of MoS2 tribology to develop a model of friction based on orientation, commensurability, defect density and crystallite size as a function of temperature, environment and starting/evolving microstructure of tribofilms formed during sliding. MoS2 films of varying microstructure, composition and processing techniques will be systematically tested to develop a mechanistic framework for tribological interactions of MoS2. Experiments include environmental tribological studies looking to the effects of ultrahigh vacuum, humidity, O2, atomic oxygen and temperature extremes through state-of-the-art surface chemical characterization and atomistic molecular dynamics models. Finally, tribological experiments and material samples returned from the international space station will be analyzed.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项教师的早期职业发展（职业）计划赠款支持对重要的干燥，非油的固体润滑材料的摩擦和磨损过程的基本研究，这些材料对于在包括空间在内的恶劣环境中使用至关重要。这项工作旨在促进我们对润滑机制的理解，以帮助干燥润滑剂的进一步发展。这些润滑剂对我们的国防和繁荣至关重要，这会影响较差的润滑不良会导致磨损的许多商业应用，从而限制了机器寿命和浪费能量。该研究将使用原子级工具来了解这些干润滑剂的表面结构，并重点是MOS2，这是最重要的干润滑剂。这种润滑剂通过在MOS2内的缺陷和缺陷结构的发展而无法使用。为了确定这种缺陷结构的演变，样品将在实验室中经历受控磨损，或者将长时间暴露于国际空间站（ISS）的空间环境。将确定摩擦和润滑性能以及原子水平结构的变化。该信息将在所有环境中具有延长寿命的新润滑剂和添加剂的设计中对缺陷形成过程的基本了解。宣传和教育特征包括一项综合研究/教育计划，以增加社会各个层面的教育，对摩擦学的兴趣和兴趣，并进行动手的K-12外展活动，课程发展以及学生本科生和研究生研究经验。经验，高级表征和模型将探讨结构，处理，处理，物业和摩擦式效果之间的链接，包括太空涂层（包括太空）。技术计划以2个研究为中心：1）评估二硫化钼微观结构和组成在暴露于氧化和潮湿环境期间的化学和摩擦学降解中的作用； 2）了解MOS2摩擦学的能量学，以基于方向，相当性，缺陷密度和晶体大小作为温度，环境以及滑动过程中形成的互感的微观结构的函数。 MOS2的微观结构，组成和加工技术的MOS2膜将进行系统测试，以开发MOS2摩擦学相互作用的机械框架。实验包括通过最新的表面化学表征和原子分子动力学模型的超高真空，湿度，O2，原子氧和极端温度的影响的环境摩擦学研究。最后，将分析从国际空间站返回的摩擦学实验和材料样本。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响评估标准，被认为值得通过评估来获得支持。

项目成果

Atomistic Origins of Temperature-Dependent Shear Strength in 2D Materials

• DOI: 10.1021/acsanm.8b01454
• 发表时间: 2018-09
• 期刊: ACS Applied Nano Materials
• 影响因子: 5.9
• 作者: J. Curry;Adam R. Hinkle;T. Babuska;Mark A. Wilson;M. Dugger;B. Krick;N. Argibay;M. Chandross