Oxide Evolution Dynamics and Stability in Harsh Environments

恶劣环境中的氧化物演化动力学和稳定性

• 批准号: 1200415
• 负责人: Brian Gleeson
• 金额: $ 40.63万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-15 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1200415&HistoricalAwards=false
• 关键词: Oxide; Evolution; Dynamics; Stability; Harsh

The research objective of this grant is to gain a detailed fundamental understanding of the complex interplay between the thermodynamics and kinetics governing early-stage surface-oxidation processes in single- and multi-oxidant environments. The study will use advanced high-resolution techniques to allow in situ interrogation of reaction-product interfaces for elucidating structural, chemical, and defect developments. Specifically, Ni, Ni-Cr, and, later, Ni-Cr-Al alloys in 700-1100¢ªC environments containing O2, H2O, CO2, or some combination of these as primary oxidants will be systematically examined. While the central focus is to establish science-based approaches for developing and/or improving advanced high-temperature alloys and coatings used in the many harsh environments found in practice, the scientific understanding gained will also contribute to elucidating the collective and coupled behaviors of surface reactions in general.If successful, this interdisciplinary collaborative effort will lead to new paradigms in the important field of gas-solid surface reactions, such as corrosion, catalysis, sensors, fuel cells, and synthesis for a variety of electronic, magnetic, medical, and optical devices. The study will contribute to national economic competitiveness (novel materials and technologies created), development of a competitive STEM workforce (training and mentorship of graduate students and post-docs, interdisciplinary courses), the participation of women and underrepresented minorities; high school community outreach (Pennsylvania Junior Academy of Science), and national security (sustainable energy, energy generation, enhanced aircraft design). Materials-related classes at all levels will be developed or modified in multiple departments driven by the need to introduce students to the latest developments in materials-centered research and technology. Examples of classes include Gas-Metal Reactions, Crystallography, Nanocharacterization, Transmission Electron Microscopy, and Introduction to Materials Science.

这项资助的研究目标是对单氧化剂和多氧化剂环境中控制早期表面氧化过程的热力学和动力学之间复杂的相互作用有一个详细的基本理解。该研究将使用先进的高分辨率技术，允许对反应产物界面进行原位分析，以阐明结构、化学和缺陷的发展。具体地说，在含有O2、H2O、CO2或它们的某些组合作为主要氧化剂的700-1100°C环境中，将系统地检查Ni、Ni- cr和后来的Ni- cr - al合金。虽然中心重点是建立基于科学的方法来开发和/或改进在实践中发现的许多恶劣环境中使用的先进高温合金和涂层，但所获得的科学理解也将有助于阐明一般表面反应的集体和耦合行为。如果成功，这一跨学科的合作努力将在气固表面反应的重要领域，如腐蚀、催化、传感器、燃料电池和各种电子、磁性、医疗和光学设备的合成，带来新的范例。该研究将有助于提高国家经济竞争力（创造新材料和技术），发展有竞争力的STEM劳动力（研究生和博士后的培训和指导，跨学科课程），妇女和代表性不足的少数民族的参与；高中社区拓展（宾夕法尼亚初级科学院）和国家安全（可持续能源、能源发电、增强型飞机设计）。由于需要向学生介绍以材料为中心的研究和技术的最新发展，各个级别的材料相关课程将由多个部门开发或修改。这类课程的例子包括气体-金属反应、晶体学、纳米表征、透射电子显微镜和材料科学导论。