Development of strain tolerant aluminia scasles on MCr-AL-Basis high temperatur alloys and coatings

MCr-AL 基高温合金和涂层的耐应变铝鳞片的开发

• 批准号: 5439187
• 负责人: Dr.-Ing. Dmytro Naumenko
• 金额: --
• 依托单位: IEK-2: Werkstoffstruktur und -eigenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5439187?language=en
• 关键词: Development; strain; tolerant; aluminia; scasles

Recently available results indicate that spallation resistance of the protective alumina scales on MCrAl-type (M=Fe, Ni/CO) alloys and coatings crucially depends on the scale microstructure because scales containing microstrutural defects, such as nano-sized pores and cracks often exhibit a higher fracture toughess, than virtally defect-free, uniform alumina films. The oxide microstructure can, to a large extent be controlled by modifying the minor alloy (coating) composition and by using suitable suface pre-treatments. In the proposed project the effect of the latter parameters on the oxide grain size and porosity formation in the alumina scales will be quantitatively assessed. A quantitative correlation between the oxide microstructure, isothermal oxidation kinetics and fracture toughness of the formed scales will be derived. The scale properties will be characterised by a range of analytical techniques with emphasis on quantitative SEM studies and piesospectroscopic stress measurements. The knowledge derived in these studies can be used as a guideline for development of MCrAl-type alloys (coatings) with extended service lives.

最近的研究结果表明，MCrAl型（M=Fe，Ni/CO）合金和涂层上的保护性氧化铝膜的耐溅射性主要取决于氧化膜的微观结构，因为含有微观结构缺陷（如纳米尺寸的孔和裂纹）的氧化膜通常比无缺陷的均匀氧化铝膜表现出更高的断裂韧性。氧化物的微观结构在很大程度上可以通过改变微量合金（涂层）的成分和使用合适的表面预处理来控制。在拟议的项目中，将定量评估后一参数对氧化铝鳞片中氧化物粒度和孔隙形成的影响。氧化物的微观结构，等温氧化动力学和断裂韧性之间的定量相关性形成的鳞片将被导出。将通过一系列分析技术来表征尺度特性，重点是定量SEM研究和压电光谱应力测量。在这些研究中获得的知识可以用作开发具有延长使用寿命的MCrAl型合金（涂层）的指南。