CoCrAlSiY合金涂层的高温选择性氧化和界面扩散机制研究

项目名称： CoCrAlSiY合金涂层的高温选择性氧化和界面扩散机制研究

项目编号： No.51201012

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 张淑婷

作者单位： 北京矿冶研究总院

项目金额： 25万元

中文摘要： 海洋环境下服役的燃气轮机叶片及燃烧室内的热端部件产生的高温氧化和热腐蚀破坏已成为影响整机性能、寿命、成本和安全的主要问题。采用含Si系的MCrAlY合金涂层对其进行防护是目前国内外采用的普遍办法。高温条件下含Si系MCrAlY合金元素的选择性氧化和涂层/基体界面扩散机制是影响涂层抗氧化和热腐蚀性能的关键因素，但该方面的基础研究尚属空白。本项目采用真空雾化和超音速喷涂方法分别制备了CoCrAlSiY合金粉末和涂层，对含Si系MCrAlY合金元素的化学活度和涂层/基体界面元素浓度变化、Si元素对涂层氧化膜结构及应力状态等的影响进行研究，揭示Si对高温条件MCrAlY合金元素的选择性氧化的影响规律，获得含Si系MCrAlY合金元素涂层/界面的元素扩散机制。此项目的研究成果将为海洋环境下服役的燃气轮机叶片及其燃烧室内热端部件防护技术开发与应用提供理论依据和科学指导。

中文关键词： CoCrAlYSi涂层；抗氧化；抗热腐蚀；抗热震性能；

英文摘要： The damage caused by high temperature oxidation and hot corrosion in gas turbine blades and heat-side components of the combustion chamber has become the main issues affecting the performance, life and safety of the gas turbine working in the marine environment. MCrAlY alloy coating with some content of Si is now universally used for its protection. The selective oxidation and diffusion mechanism in the coating/substrate interface in high temperature condition are rarely studied, although they are the main factors affecting the performance of resistance to oxidation and hot corrosion of the MCrAlY alloy coating with Si. CoCrAlSiY alloy powder and coatings are prepared by vacuum induction gas atomization and HVOF spraying respectively, and its main elements chemical activity, element concentration change in the coating/substrate interface of MCrAlY coatings and the impact of Si on the structure of the oxide film and the stress state will be studied. Then the law of the Si on the selective oxidation of the MCrAlY alloy in high temperature condition will be revealed, and its interface element diffusion mechanism will be obtained. This project will provide a theoretical basis and scientific guidance for protection technology development and application of the heat-side component of the gas turbine blades and combust

英文关键词： CoCrAlYSi coating；oxidation resistance；hot corrosion；thermal shock resistance；