Investigation on Improvement of Process Stability of Thermal Barrier Coatings on Blades Prepared by Electron Beam Physical Vapour Deposition
TENG Xiaodan1, PENG Hui2,3, LI Liuhe1,4, GUO Hongbo2,3,5, GONG Shengkai1,2,3
1. Research Institute of Aero-Engine, Beihang University, Beijing 100191, China;
2. Research Institute for Frontier Science, Beihang University, Beijing 100191, China;
3. Key Laboratory of High-Temperature Structural Materials & Coatings Technology (Ministry of Industry and Information Technology), Beijing 100191, China;
4. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China;
5. School of Materials Science and Engineering, Beihang University, Beijing 100191, China
Electron beam physical vapor deposition (EB–PVD) is widely used in fabricating thermal barrier coatings (TBCs) onto aero-engine turbine blades. The process stability of EB–PVD determines the quality of TBCs and batch-tobatch consistency. In this work, two technologies including automatic evaporation of ceramic targets and multi-degreeof-freedom motion of blades were developed, in order to improve the EB–PVD coating performance. The results show that the ceramic targets can be automatically evaporated, yielding an even and smooth top surface. Coatings are obtained with a well-developed columnar structure. Two-layer coating system for ultra-high temperature applications can be further realized by the two-crucible configuration, which allows the deposition of two different targets within one coating process. The multi-degree-of-freedom motion enables the blades to rotate and tilt simultaneously, benefiting the tailoring of microstructure and thickness distribution of parts with complex geometries. Burner rig tests conducted for coating properties validation demonstrate that coatings deposited at the top surface of the platform exhibit excellent thermal cycling life compared with that at the outer surface of the blades.
滕晓丹,彭徽,李刘合,郭洪波,宫声凯. 电子束物理气相沉积叶片热障涂层工艺稳定性提升技术研究[J]. 航空制造技术, 2023, 66(1/2): 40-45,52.
TENG Xiaodan, PENG Hui, LI Liuhe, GUO Hongbo, GONG Shengkai. Investigation on Improvement of Process Stability of Thermal Barrier Coatings on Blades Prepared by Electron Beam Physical Vapour Deposition[J]. Aeronautical Manufacturing Technology, 2023, 66(1/2): 40-45,52.