CAREER: High Temperature Deformation of Stand-Alone Plasma-Sprayed Yttria-doped Zirconia Coatings

事业：独立等离子喷涂氧化钇掺杂氧化锆涂层的高温变形

• 批准号: 0134286
• 负责人: Rodney Trice
• 金额: $ 37.5万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-03-01 至 2008-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0134286&HistoricalAwards=false
• 关键词: CAREER; Temperature; Deformation; Stand; Alone

Thermal barrier coatings of plasma-sprayed 7 wt.% Y2O3-ZrO2 (YSZ) are to be extensively studied at representative use temperatures (800 degrees C-1400 degrees C) using a modified compression test for stand-alone coatings. For the test, the YSZ coating is removed from the substrate to isolate its behavior, and creep testing, stress relaxation, and fast fracture experiments will be performed. In addition to mechanical testing, we will use the following characterization methods for the proposed work: dilatometry, transmission electron microscopy, X-ray diffraction, Raman Spectroscopy, and laser flash (to measure thermal conductivity). Each method listed will provide the necessary information to interpret the mechanical testing results. Thus, the principal output of this research will be structure-property relationships of plasma-sprayed YSZ in simulated operating environments. This will involve establishing deformation mechanisms as a function of temperature, stress, time, and sample microstructure (i.e. porosity and lamella size). This program will also establish a foundation for a lifetime of educational excellence through curriculum development, outreach, and mentoring. To increase non-majors participation in materials classes at Purdue, web-based modules will be designed that directly relate materials science applications to each of the engineering majors, and then incorporated into the introductory materials course. Beyond the activities at Purdue, an outreach program for science students at Jefferson High School (JHS) in Lafayette, Indiana will be established. In this program, high school juniors will spend 8 weeks of the summer with our research group, then continue their research in the fall and spring of their senior year through an established research based science class at JHS. There will also be a significant undergraduate mentoring component in the proposed work through support of a Purdue MSE undergraduate student every fall and spring semester of the program, as well as a Research Experience for Undergraduates (REU) student every summer.Virtually every commercial and military aircraft flying today uses thermal barrier coatings (TBCs) to protect the metallic structure of its gas turbine engine(s) from temperature extremes and/or to allow the engine to be operated at higher, more efficient temperatures. In addition to the transportation sector, the energy sector also relies on the efficiency boosts TBCs provide industrial gas turbines (IGTs) as they produce electricity. While the benefits of TBCs result in significant cost savings in these and other sectors, there are still many aspects of TBCs we don't understand. For example, they often shrink, crack and even detach from the underlying metallic structure during elevated temperature service. Thus, basic research into their high temperature mechanical properties will allow us to fully utilize the benefits of using these coatings. At its most fundamental level, then, this proposal focuses on determining the material properties that govern how well TBCs "work" while they are in service and will serve as a basis for designing next-generation TBCs.

等离子喷涂的热障涂层7重量% Y2 O3-ZrO 2（YSZ）将在代表性的使用温度（800摄氏度-1400摄氏度）下使用改进的独立涂层压缩试验进行广泛研究。对于该测试，YSZ涂层从基底上去除以隔离其行为，并将进行蠕变测试、应力松弛和快速断裂实验。除了机械测试外，我们还将使用以下表征方法进行拟定工作：折光率测定、透射电子显微镜、X射线衍射、拉曼光谱和激光闪光（测量热导率）。列出的每种方法将提供必要的信息来解释机械测试结果。因此，本研究的主要成果将是等离子喷涂YSZ在模拟工作环境中的结构-性能关系。这将涉及建立变形机制作为温度、应力、时间和样品微观结构（即孔隙率和薄片尺寸）的函数。该计划还将通过课程开发，推广和指导为终身教育奠定基础。为了增加普渡大学非专业学生对材料课程的参与，将设计基于网络的模块，将材料科学应用与每个工程专业直接联系起来，然后将其纳入入门材料课程。除了普渡大学的活动之外，还将为印第安纳州拉斐特的杰斐逊高中（JHS）的理科学生建立一个外展项目。在这个程序中，高中三年级学生将花8个星期的夏天与我们的研究小组，然后继续他们的研究在秋季和春季的高年级通过一个既定的研究为基础的科学类在JHS。也将有一个重要的本科生辅导组成部分，在拟议的工作，通过支持普渡大学MSE本科生每秋季和春季学期的计划，事实上，今天飞行的每一架商用和军用飞机都使用热障涂层（TBCs）来保护其燃气涡轮机发动机的金属结构避免极端温度和/或允许发动机在更高、更有效的温度下运行。除了运输部门，能源部门也依赖于TBC提供的工业燃气轮机（IGT）的效率提升，因为它们生产电力。虽然TBC的好处导致这些和其他部门的显着成本节约，但我们仍然不了解TBC的许多方面。例如，在高温使用期间，它们经常收缩、破裂甚至从下面的金属结构分离。因此，对其高温机械性能的基础研究将使我们能够充分利用使用这些涂层的好处。因此，在最基本的层面上，该提案的重点是确定材料特性，这些特性决定了热障涂层在使用中的“工作”情况，并将作为设计下一代热障涂层的基础。