Understanding Alloy Chemistry for Enhanced Environmental Resistance

了解合金化学以增强耐环境性

• 批准号: 1662817
• 负责人: Hojong Kim
• 金额: $ 33.34万
• 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: 2017
• 资助国家: 美国
• 起止时间: 2017-07-01 至 2022-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1662817&HistoricalAwards=false
• 关键词: Understanding; Alloy; Chemistry; Enhanced; Environmental

Materials used in technologies with aggressive chemical environments such as gas turbines, fuel cells, batteries, and solar thermal power plants are being pushed to their operation limits to meet market demands for higher power and efficiency at reduced emissions and operating costs. The continued development of next-generation technologies requires a fundamental understanding of how materials respond to extreme chemical environments, which will enable the design of high performance alloys. This award supports fundamental research to learn how the composition and structure of high performance alloys can be engineered to improve performance in these environments. The ultimate goal is to provide tools for the design of corrosion-resistant materials for aggressive chemical environments found in future sustainable technologies, such as heat transfer fluid for concentrated solar power systems, gas turbines, and molten carbonate fuel cells. The knowledge gained in this project has broad applicability across fields essential for the future of U.S. competitiveness, including electrochemical energy storage (batteries), materials synthesis, and corrosion-resistant coatings. The research will be incorporated into courses at the graduate and undergraduate level, and will enhance K-12 outreach programs directed at broadening participation in STEM.This research centers on understanding the impact of alloying elements in controlling (1) the degradation reactions at interfaces between the alloy and its chemical environment at elevated temperatures (650-950°C), (2) the structure and chemistry of the protective oxide layer, as well as (3) the thermodynamic and mass transport properties of alloys - critical factors in the formation of protective oxide layers. Based on a model Ni-Al system, the research team will determine the thermodynamic, mass transport properties, and interfacial degradation reactions of Ni-based alloys under the systematic control of alloy chemistry (Cr, Pt, and Hf) using electrochemical techniques. The researchers will test the hypothesis that alloying elements (Cr, Pt, and Hf) can enhance environmental resistance of the Ni-Al alloys by facilitating the formation of a protective oxide layer (Al2O3). The work will result in the creation of a database of thermodynamic, mass transport, and interfacial corrosion properties of multi-component alloys, as well as the experimental techniques for their measurement.

在恶劣的化学环境中使用的材料，如燃气轮机、燃料电池、电池和太阳能热电厂，正在被推向其运行极限，以满足市场对更高功率和效率的需求，同时减少排放和运营成本。下一代技术的持续发展需要对材料如何应对极端化学环境有基本的了解，这将使高性能合金的设计成为可能。该奖项支持基础研究，以了解如何设计高性能合金的成分和结构，以提高这些环境中的性能。最终目标是为未来可持续发展技术（如聚光太阳能发电系统、燃气轮机和熔融碳酸盐燃料电池的传热流体）中具有腐蚀性化学环境的耐腐蚀材料的设计提供工具。在该项目中获得的知识对美国未来的竞争力至关重要，包括电化学储能（电池）、材料合成和耐腐蚀涂层。这项研究将被纳入研究生和本科阶段的课程，并将加强旨在扩大STEM参与的K-12外展计划。本研究的重点是了解合金元素在控制(1)高温（650-950℃）下合金及其化学环境界面的降解反应，(2)保护氧化层的结构和化学性质，以及(3)合金的热力学和质量传递性质-保护氧化层形成的关键因素方面的影响。基于模型Ni-Al系统，研究小组将利用电化学技术确定ni基合金在合金化学（Cr， Pt和Hf）的系统控制下的热力学，质量传递性质和界面降解反应。研究人员将测试合金元素（Cr， Pt和Hf）可以通过促进保护性氧化层（Al2O3）的形成来增强Ni-Al合金的环境抗性的假设。这项工作将导致建立一个关于多组分合金的热力学、质量传递和界面腐蚀特性的数据库，以及用于测量这些特性的实验技术。

项目成果

Thermodynamic Properties of Sr–Sn Alloys via Emf Measurements and Thermal Analysis

• DOI: 10.1149/1945-7111/ab8de1
• 发表时间: 2020-04
• 期刊: Journal of The Electrochemical Society
• 影响因子: 3.9
• 作者: N. Smith;Jorge Paz Soldan-Palma;Yuran Kong;Zi-kui Liu;Hojong Kim

Influence of gaseous atmosphere on electrochemical behavior of nickel alloys in LiCl-KCl-Na2SO4 at 700 °C

• DOI: 10.1016/j.corsci.2018.05.039
• 发表时间: 2018-09
• 期刊: Corrosion Science
• 影响因子: 8.3
• 作者: Kuldeep Kumar;Jarrod Gesualdi;N. Smith;Hojong Kim

Thermodynamic properties of Ca–Pb electrodes determined by electromotive force measurements

• DOI: 10.1016/j.jpowsour.2020.227745
• 发表时间: 2020-03
• 期刊: Journal of Power Sources
• 影响因子: 9.2
• 作者: N. Smith;Nicole E. Orabona;Jorge Paz Soldan Palma;Yuran Kong;Cameron F. Blanchard;Hojong Kim

Electrochemical Separation of Alkaline-Earth Elements from Molten Salts Using Liquid Metal Electrodes

使用液态金属电极电化学分离熔盐中的碱土元素

• DOI: 10.1021/acssuschemeng.0c04249
• 发表时间: 2020
• 期刊: ACS sustainable chemistry engineering
• 作者: Nigl, Thomas P.;Lichtenstein, Timothy;Kong, Yuran;Kim, Hojong
• 通讯作者: Kim, Hojong