DD91基体/NiCrAlY涂层界面元素互扩散行为研究-中国材料进展

文章信息/Info

Title:: Interdiffusion Behavior of Interface Elements Between DD91 Substrate/NiCrAlY Coating

作者:: 章孝琴; 王卫泽; 刘帅男; 刘朋朋; 1.华东理工大学机械与动力工程学院，上海 200237 2.上海飞行器力学与控制研究院，上海 200237

Author(s):: ZHANG Xiaoqin ; WANG Weize; LIU Shuainan; LIU Pengpeng; 1. School of Mechanical and Power Engineering, East China University of Science and Technology，Shanghai 200237，China 2. Shanghai Institute of Aircraft Mechanics and Control，Shanghai 200237，China

Keywords:: NiCrAlY coating; DD91 nickel-based single crystal alloy; atmospheric plasma spraying; interdiffusion; thermal exposure

摘要:: 为研究NiCrAlY涂层与DD91镍基单晶合金的互扩散行为，采用大气等离子喷涂技术在镍基单晶合金DD91基体表面沉积NiCrAlY涂层，在1150 ℃下对试样进行不同时间的热暴露处理，通过SEM、EDS、XRD等方法研究了基体与涂层界面元素互扩散行为和显微组织变化。研究结果表明：在1150 ℃热暴露下，NiCrAIY涂层中的Ni和Cr元素由涂层向基体扩散；Co，Al，Ta，Re，Ru，W和Mo元素则是由基体向涂层扩散。在涂层和基体界面处形成了互扩散区，互扩散区厚度随着热暴露时间的延长而增加并逐渐稳定；在热暴露50 h时互扩散区下方析出大量拓扑密堆相，随着热暴露时间延长，拓扑密堆相又溶解于基体中。

Abstract:: In order to investigate the interdiffusion behaviors between NiCrAlY coating and nickel-based single crystal alloy DD91, NiCrAlY coating was deposited on the surface of nickel-based single crystal alloy DD91 substrate by atmospheric plasma spraying technology. The samples were thermally exposed at 1150 ℃ for different time. The interdiffusion behavior of elements and microstructure changes at the interface between substrate and coating were studied by SEM，EDS and XRD. The results showed that under the condition of 1150 ℃，Ni and Cr elements in the NiCrAIY coating diffuse from the coating to the substrate. Co, Al, Ta, Re, Ru, W and Mo elements diffuse from the substrate to the coating. The interdiffusion zone (IDZ) was formed at the interface between the coating and the substrate，and the thickness of IDZ increased with time and gradually stabilized. A large number of topologically closepacked phase were precipitated under the IDZ after thermal exposure for 50 h. Along with the thermal exposure time，the topologically close-packed phase was dissolved in the matrix.