电泳沉积制备新型热障涂层粘结层及失效机理研究

项目名称： 电泳沉积制备新型热障涂层粘结层及失效机理研究

项目编号： No.51271120

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 肖平

作者单位： 上海交通大学

项目金额： 80万元

中文摘要： 热障涂层是现代高性能航空发动机、工业燃气轮机的关键材料，它能大幅提高发动机工作效率并延长组件使用寿命。粘结层作为热障涂层体系的核心，直接控制热障涂层的失效方式及寿命。传统粘结层的制备一般通过热喷涂、气相沉积和渗铝扩散，不但难于控制成分和微观结构，而且在处理过程中容易引入基体的影响，因此无法将影响热障涂层失效的各种因素分离出来。本项目旨在开发一种新型粘结层制备技术。利用电泳沉积结合真空烧结，制备结构、成分及力学性能可控的粘结层。通过比较包含基体和不含基体的粘结层，揭示基体的影响。同时利用氧化物弥散强化，来抑制杂质硫偏析，增加界面结合强度，并改善界面形貌，减少裂纹产生。此外，通过系统研究粘结层成分结构对氧化层-粘结层系统的力学性能、残余应力、及界面结合强度的影响，设计出性能优异的粘结层。本研究基于申请人过去在此领域长期工作经验，将新型制备技术与系统表征相结合，加深对热障涂层失效机理的理解。

中文关键词： 粘结层；电泳沉积；真空烧结；氧化；失效机理

英文摘要： Thermal barrier coatings (TBCs) are widely used in gas-turbines for aerospace and power generation industry to increases the engine efficiency and prolong the lifetime of engine components. As the most important constituent in TBCs systems, the bond coat directly affects the failure mode and the lifetime of the systems. Conventionally, the bond coat is produced by thermal spray, electron beam physical vapour deposition or aluminising process. In some cases, bond coat is produced with electroplating of Pt on superalloy substrates and then thermal diffusion between the Pt layer and substrate to produce bond coat. However, those fabrication methods are difficult to control the composition and the microstructure of the bond coat. In addition, the substrate will introduce additional effect on the bond coat. Therefore, it is difficult to distinguish and identify the factors which affect the spallation of TGO and failure of TBCs. The initial objective of this research is to develop a novel bond coat fabrication technique, electro-phoretic deposition (EPD) coupled with sintering in vacuum, to produce bond coats with controlled microstructure and composition. EPD has been developed by the applicant's team to produce top coat for TBC applications. In this research the bond coat will be produced with and without sub

英文关键词： Bond coat；Electrophoretic deposition；Furnace vacuum sintering；Oxidation behaviors；Failure mechanisms