Fundamental Materials Dynamics of Protective Overlay Coatings for High Temperature Structural Materials

高温结构材料保护涂层的基础材料动力学

• 批准号: 0504950
• 负责人: Mark Weaver
• 金额: --
• 依托单位: University of Alabama Tuscaloosa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-15 至 2010-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0504950&HistoricalAwards=false
• 关键词: Fundamental; Materials; Dynamics; Protective; Overlay

TECHNICAL: This grant supports fundamental research that explores the influence of coating chemistry and microstructure on the mechanical properties and oxidation resistance of novel NiAl-Hf overlay bond coatings. The coatings are designed for use in high-temperature structural applications. The research relies on the application of novel micromechanical and analytical techniques to characterize the microstructures and properties of multiphase, sputter-deposited overlay coatings. The technological motivation is development of novel coatings that will increase the capability and durability of emerging engineering structures targeted for high-temperature structural applications. While this program is primarily directed towards the development of bond coatings for thermal barrier coating systems, related applications include environmental barrier coatings for silicon-based ceramics and overlay coatings for high speed cutting tools. A basic understanding of the changes in coating properties produced by microstructural modification (i.e., grain morphology and precipitate distribution) will open new horizons for the development and application of thinner, more durable coatings. NONTECHNICAL: This project has a positive impact on science and engineering infrastructure through the training of graduate students. The two graduate students in the project employ aspects of surface science, physical chemistry, metallurgical and ceramic engineering, thin film science, materials processing, microstructural characterization, and materials selection. The students benefit by being involved in advanced research in the micromechanical, chemical, and microstructural characterization of multilayered materials. They utilize state-of-the-art analytical tools. The integration of undergraduate students from the freshman and sophomore classes at the University of Alabama and from neighboring HBCU's provides those students with practical laboratory experiences above and beyond that normally associated with their academic coursework. In addition, the relevance of the project to advanced coating technologies provides a strong practical motivation for the work in addition to ensuring good career options for the students involved.

技术：这笔赠款用于基础研究，探索涂层化学和微结构对新型NiAl-Hf涂层的机械性能和抗氧化性的影响。该涂料专为高温结构应用而设计。这项研究依赖于应用新的微机械和分析技术来表征多相溅射沉积覆层的微观结构和性能。技术动机是开发新型涂层，以提高针对高温结构应用的新兴工程结构的能力和耐久性。虽然该项目主要针对热障涂层系统的粘结涂层的开发，但相关应用包括硅基陶瓷的环保涂层和高速刀具的覆层涂层。对显微结构改性引起的涂层性能变化(即颗粒形态和沉淀物分布)的基本了解将为开发和应用更薄、更耐用的涂层开辟新的天地。非技术性：该项目通过培养研究生，对科学和工程基础设施产生了积极影响。该项目的两名研究生涉及表面科学、物理化学、冶金和陶瓷工程、薄膜科学、材料加工、微结构表征和材料选择等方面。学生通过参与多层材料的微观机械、化学和微结构表征方面的高级研究而受益。他们利用最先进的分析工具。阿拉巴马大学一年级和二年级的本科生以及邻近的HBCU的本科生融合在一起，为这些学生提供了超出通常与他们的学术课程相关的实际实验室经验。此外，该项目与先进涂层技术的相关性不仅为参与的学生提供了良好的职业选择，还为该工作提供了强大的实践动力。