镍基单晶高温合金PA EB-PVD γ/γ'涂层微观组织结构和抗高温氧化机理研究

项目名称： 镍基单晶高温合金PA EB-PVD γ/γ'涂层微观组织结构和抗高温氧化机理研究

项目编号： No.51201005

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： 彭徽

作者单位： 北京航空航天大学

项目金额： 25万元

中文摘要： 镍基单晶高温合金是目前航空发动机热端部件的关键结构材料。为了提高单晶合金的抗高温氧化腐蚀性能，需要进行表面涂层防护。近来研究发现，现有的MCrAlY（M：Ni，Co）或铝化物涂层由于Al含量较高，导致Al元素向单晶合金基体内扩散，大幅度降低了单晶合金的高温力学性能。低Al含量的γ/γ′涂层与单晶合金具有良好的界面匹配性能，引起了国内外学者的广泛关注。但Al含量的下降也降低了涂层的抗高温氧化性能，如何平衡γ/γ′涂层界面匹配性能和抗高温氧化性能之间的关系，是亟待解决的关键问题。 针对上述问题，本项目拟提出一种具有良好单晶合金界面匹配性兼具优异抗氧化性能的γ/γ′涂层，并对该涂层等离子体激活电子束物理气相沉积实现机制、微观组织结构以及抗高温氧化机理等科学技术问题开展研究，为研制出适用于先进单晶高温合金的金属防护涂层提供可行的实现方法和理论指导。

中文关键词： 热障涂层；氧化；EB-PVD；等离子体；

英文摘要： Ni-based single crystal superalloy is the key structure material used in aeroengines. Single crystal superalloy should be protected by protective coatings,in order to improve its oxidation and corrosion resistance. It has been reported recently that a serious interdiffusion of Al from the coating into the alloy substrate occurs due to the high concentration of Al in the coating, thus resulting in an significant reduction of the mechanical properties. γ/γ′coating with lower Al content attracts extensive attention due to its satisified matching properity at the coating/substrate interface. However, the oxidation resistance of the coating is decreased, as a result of the reduction of Al content.Balancing the relation between the oxdation resistance and the interface matching properity is the key problem to be solved. In order to overcome the problems mentioned above, a γ/γ′coating with both satified oxidation resistance and interface matching properity is proposed. Meanwhile, some basic scientific problems including the plasma activated electron beam-physical vapor deposition method for fabrication, microstructure and oxidation mechanisms of the novel coating will be studied, aiming to provide a pratical technique and theoretical instructions to the protection of the advanced single crystal superalloy.

英文关键词： thermal barrier coating；oxidation；EB-PVD；plasma；