GOALI: Comibinatorial Methods and Micro-Scale Characterization Techniques for TBC Optimization

GOALI：TBC 优化的组合方法和微尺度表征技术

• 批准号: 0413803
• 负责人: Kevin Hemker
• 金额: --
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0413803&HistoricalAwards=false
• 关键词: GOALI; Comibinatorial; Methods; Micro; Scale

This GOALI grant from the Division of Materials Research to Johns Hopkins University is to employ combinatorial methods and micro-scale testing to elucidate the role of alloy chemistry on the martensite transformation in bond coats for thermal barrier coatings (TBCs) applied to superalloys. With this award, Professors Hemker and Zhao will be opening a new paradigm for bond coat design, and the research will promote the development of experimental tools needed to advance new materials into a variety of structural applications. This grant is motivated by the recent discovery of martensite transformation occurring in thermally cycled, platinum modified, nickel aluminide bond coats. This transformation has been shown to dramatically influence the performance of the TBC and is known to be highly dependent on alloy chemistry, which can vary as a result of element interdiffusion. The use of diffusion multiples provides a highly efficient means for clarifying the role that stoichiometry and ternary elements (e.g. Platinum, Chromium, Rhenium, Tungsten, Molybdenium, Tantalum, Cobalt and Hafnium) will have in governing martensite formation. Targeted thin film combinatorial samples of specific compositions, determined using diffusion multiples, are fabricated with inert plasma deposition and characterized with a suite of novel micro-scale characterization techniques (micro-tensile testing, nanoindentation, micro-probe spectroscopy, differential thermal analysis, X-ray diffraction and transmission electron microscopy). The results should provide a fundamental understanding of the martensite transformation that occurs in TBC bond coats and thereby provide a science-based protocol for the development of long lasting, high performance TBC coatings. The technological motivation for this research is rooted in the fact that thermal barrier coatings offer tremendous opportunities for increasing the temperature capabilities and durability of components in aircraft engines and power turbines. In addition, the scientific challenges to be addressed, namely the development of combinatorial methods and novel micro-scale characterization techniques for assessing the stability, strength and performance of multilayered coatings, have a much broader application for the development of multicomponent structural materials. This Grant Opportunities for Academic Liaison with Industry (GOALI) collaboration includes closely meshed research activities and yearly personnel exchanges, and places Johns Hopkins students and faculty in direct contact with engineers and scientists at the GE Global Research Center. This broadens the education of the JHU students by providing invaluable technological and industrial experience. The benefits to GE include the availability of unique JHU experimental expertise and the ability to focus on fundamental research in an area that is of high technological interest.

这项由材料研究部授予约翰霍普金斯大学的目标是利用组合方法和微型测试来阐明合金化学对高温合金热障涂层(TBCs)粘结涂层中马氏体转变的作用。有了这个奖项，海姆克和赵教授将开启粘合涂层设计的新范式，这项研究将促进将新材料应用于各种结构应用所需的实验工具的开发。这笔赠款的动机是最近发现在热循环、铂变质的镍铝化物粘结层中发生马氏体转变。这种转变已被证明极大地影响TBC的性能，并已知高度依赖于合金化学，而合金化学可因元素互扩散而变化。扩散倍数的使用为阐明化学计量比和三元元素(如铂、铬、Re、钨、钼、钽、钴和Hafnium)在控制马氏体形成中的作用提供了一种高效的手段。用惰性等离子体沉积法制备了特定成分的靶向薄膜组合样品，并用一套新颖的微尺度表征技术(微拉伸测试、纳米压痕、微探针光谱、差热分析、X射线衍射和透射电子显微镜)对其进行了表征。研究结果将有助于从根本上理解TBC粘结层中发生的马氏体相变，从而为开发持久、高性能的TBC涂层提供科学依据。这项研究的技术动机源于这样一个事实，即热障涂层为提高飞机发动机和动力涡轮机部件的温度能力和耐用性提供了巨大的机会。此外，需要解决的科学挑战，即组合方法和新的微尺度表征技术的发展，以评估多层涂层的稳定性、强度和性能，在多组分结构材料的开发中有更广泛的应用。这项GOALI学术联络机会(GOALI)合作包括紧密联系的研究活动和年度人员交流，并使约翰霍普金斯大学的学生和教职员工与GE全球研究中心的工程师和科学家直接接触。这通过提供宝贵的技术和工业经验，扩大了JHU学生的教育范围。通用电气的好处包括获得独特的JHU实验专业知识，以及能够专注于具有高度技术兴趣的领域的基础研究。