GOALI: Understanding Tribological Properties of Thermally-Synthesized Carbon

目标：了解热合成碳的摩擦学特性

• 批准号: 2315343
• 负责人: Seong Kim
• 金额: $ 45.07万
• 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: 2024
• 资助国家: 美国
• 起止时间: 2024-02-01 至 2027-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2315343&HistoricalAwards=false
• 关键词: GOALI; Understanding; Tribological; Properties; Thermally

This Grant Opportunity for Academic Liaison with Industry (GOALI) award will support fundamental tribochemistry research that will elucidate the friction and wear behaviors of carbon materials. Carbon blocks and coatings are widely used to control friction and wear of sliding interfaces in manufacturing processes or manufactured goods. This project focuses on understanding and improving tribochemical properties of thermally-synthesized carbon (TSC) materials for the application where low friction is beneficial. Polycrystalline graphite powders and other TSC materials show relatively high friction, although superlubricity is readily observed on the basal plane of graphite and for hydrogenated diamond-like carbon produced via plasma enhanced deposition process. This raises an important question – what controls superlubricous behaviors of different types of carbon materials? Addressing this question can lead to a better design of carbon materials that can be used as carbon brushes for electrical motors or generators and/or mechanical seals in which oil or grease lubrication cannot be employed. Reduction of friction and wear of these components will greatly improve energy efficiency in manufacturing processes. These issues are important in new energy applications and hence US competitiveness. Morgan Advanced Materials is participating as the GOALI partner and will provide commercial and custom-designed carbon materials for the study. The project will provide research opportunities to undergraduate students in the Penn State Commonwealth system. The surface analysis results of this project will be integrated with graduate-level education. Two hypotheses will be studied: (i) Friction of carbon materials depends on the distribution of sp2 and sp3 hybridizations and how they are connected to form the amorphous network, which varies with synthesis method. (ii) The chemical activity of reactive sites exposed at the sliding interface also varies depending on how carbon materials are synthesized. Studying these hypotheses requires the analysis of shear-induced structural transforms and chemical reactions occurring at the frictional interface; but that interface is not readily accessible for in-situ characterization. Alternately, relevant information can be deduced from the ex-situ analysis of the transfer film on the counter-surface formed from different carbon materials. This is because friction is a non-equilibrium process, and the final state of the transfer film will be a function of the initial state and the condition during friction. Various spectroscopic techniques will be employed to analyze the transfer film to identify tribochemical parameters governing friction and wear behaviors of thermally-synthesized carbon materials.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.

该奖项将支持基础摩擦化学研究，以阐明碳材料的摩擦和磨损行为。碳块和涂层广泛用于控制制造过程或制成品中滑动界面的摩擦和磨损。该项目的重点是了解和改善热合成碳（TSC）材料的摩擦化学性能，以应用于低摩擦是有益的。多晶石墨粉末和其他TSC材料显示出相对高的摩擦，尽管在石墨的基面上容易观察到超润滑性，并且对于经由等离子体增强沉积工艺产生的氢化类金刚石碳而言。这就提出了一个重要的问题--是什么控制着不同类型的碳材料的超润滑行为？解决这个问题可以导致碳材料的更好设计，其可以用作电动机或发电机的碳刷和/或机械密封件，其中不能采用油或油脂润滑。减少这些部件的摩擦和磨损将大大提高制造过程中的能源效率。这些问题对新能源应用以及美国的竞争力都很重要。摩根先进材料公司作为GOALI的合作伙伴参与其中，并将为该研究提供商业和定制设计的碳材料。该项目将提供研究机会，在宾夕法尼亚州联邦系统的本科生。该项目的表面分析结果将与研究生教育相结合。研究了两个假设：（1）碳材料的摩擦取决于sp2和sp3杂化的分布以及它们如何连接以形成非晶网络，这随合成方法而变化。(ii)在滑动界面处暴露的反应位点的化学活性也根据碳材料的合成方式而变化。研究这些假设需要分析剪切引起的结构转变和摩擦界面处发生的化学反应，但该界面不容易获得原位表征。或者，相关信息可以从对由不同碳材料形成的相对表面上的转移膜的非原位分析中推导出。这是因为摩擦是一个非平衡过程，转移膜的最终状态将是初始状态和摩擦期间条件的函数。各种光谱技术将被用来分析转移膜，以确定控制热合成碳材料摩擦和磨损行为的摩擦化学参数。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。