alpha-Al2O3 Active Diffusion Barriers in the Surface of Ni-Based Superalloy

作者：Liu Lintao; Li Zhengxian^*; Hua Yunfeng; Gao Yang; Yang Chenxi

来源：Rare Metal Materials and Engineering, 2014, 43(11): 2708-2712.

• Ni-based superalloy
• NiCrAl coating
• diffusion barrier
• alpha-Al2O3

ZrO2 precursor layer was deposited between DD5 Ni-based superalloy and NiCrAl coating by electron beam physical vapor deposition (EB-PVD). Then the vacuum diffusion treatment of 600 degrees C/4 h, 700 degrees C/4 h and 900 degrees C/4 h was carried out on the specimens of DD5/ZrO2/NiCrAl. The effects of diffusion temperature on the formation of alpha-Al2O3 active diffusion barriers were investigated. Meanwhile the high-temperature service properties of the alpha-Al2O3 active diffusion barriers were evaluated by 900 degrees C/100 h isothermal oxidation. Results show that after 900 degrees C/4 h vacuum diffusion treatment a continuous dense alpha-Al2O3 active diffusion barrier is formed in the interface of ZrO2/NiCrAl. Furthermore, the alpha-Al2O3 active diffusion barrier exhibits good stability and excellent diffusion resistance after 900 degrees C/100 h isothermal oxidation in air.

• 出版日期2014-11
• 单位西北有色金属研究院; 西安建筑科技大学; 东北大学