Optimizing Wear and Corrosion Resistance of Superlattice Coatings through Atomic-Scale Design

通过原子尺度设计优化超晶格涂层的耐磨性和耐腐蚀性

• 批准号: 1663098
• 负责人: Wenjun Cai
• 金额: $ 39.49万
• 依托单位: University of South Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-15 至 2018-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1663098&HistoricalAwards=false
• 关键词: Optimizing; Wear; Corrosion; Resistance; Superlattice

The design of new engineering materials resistant to both wear damage and corrosion degradation is in increasing demand for components in complex service conditions, such as biomedical implants, hydraulic systems, nuclear power plants, marine applications and offshore industries. Unfortunately, many engineering approaches to increasing strength in alloys can result in reduced corrosion performance. This award supports fundamental research to develop a comprehensive understanding of effective design principles that can mitigate wear and corrosion in metallic coatings. The research will focus on superlattice coatings, which are layered metallic systems with individual layer thickness below 10 nanometers, and offer great potential to provide both wear and corrosion resistance. The knowledge developed from this research will lead to design strategies for new metals and coatings with an optimal combination of high strength and excellent wear and corrosion resistance. The use of such materials may lead to significant economical savings in various industries. This program will additionally provide students with a unique educational and research experience. Outreach programs are included, which will help stimulate interests in STEM fields among young students and broaden participation of underrepresented groups in research activities. Superlattice coatings offer great opportunity to improve wear and corrosion resistance simultaneously. Little is known, however, about how key materials properties such as modulation wavelength, interface structure, and residual stress affect deformation and degradation mechanisms. This research is centered on a comprehensive study that integrates materials processing, characterization, wear and corrosion testing, and computer simulations. A finite element electrochemical model will be combined with experiments to design the optimum superlattice architecture. Advanced materials characterization will be coupled with atomistic and finite element modeling to understand the roles of key microstructural parameters on wear and corrosion resistance. With greater understanding of the deformation and degradation mechanisms, this bottom-up design approach may pave the way for creating wear and corrosion resistant structural materials needed in complex service conditions.

在复杂的服务条件下（例如生物医学植入物，液压系统，核电站，海洋应用和离岸工业），对耐磨损伤和腐蚀降解具有抗性的新工程材料的设计在于增加对组件的需求。不幸的是，许多工程方法可以提高合金强度，会导致腐蚀性能降低。该奖项支持基本研究，以对有效的设计原理有全面的理解，这些设计原则可以减轻金属涂料的磨损和腐蚀。该研究将集中在超晶格涂层上，这些层层层是层状的金属系统，单个层厚度低于10纳米，并具有提供耐磨性和耐腐蚀性的巨大潜力。从这项研究中发展的知识将为新金属和涂料提供设计策略，具有高强度，出色的磨损和耐腐蚀性的最佳组合。这种材料的使用可能会导致各种行业的经济节省大量。该计划还将为学生提供独特的教育和研究经验。包括外展计划，这将有助于刺激年轻学生对STEM领域的兴趣，并扩大代表性不足的群体参与研究活动的参与。超晶格涂料提供了同时改善耐磨性和耐腐蚀性的绝佳机会。然而，关于关键材料属性（例如调制波长，界面结构和残留应力）如何影响变形和降解机制，鲜为人知。这项研究集中在一项综合研究中，该研究将材料处理，表征，磨损和腐蚀测试以及计算机模拟整合在一起。有限的元素电化学模型将与实验相结合，以设计最佳的超晶格体系结构。先进的材料表征将与原子和有限元建模相结合，以了解关键微观结构参数在磨损和腐蚀耐药性上的作用。通过对变形和降解机制有更深入的了解，这种自下而上的设计方法可能为在复杂的服务条件下需要耐磨损和耐腐蚀的结构材料铺平了道路。