The role of Re in improving the oxidation-resistance of a Re modified PtAl coating on Mo-rich single crystal superalloy

• 作者: Jingchen Li Liangliang Wei Jian He Hao Chen Hongbo Guo
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（23）
• 页码范围: 63-72
• 页数: 10页
• 语种: 英文

摘要

A novel Re modified β-(Ni,Pt)Al coating was prepared on a Mo-rich Ni3Al-based single crystal (SC) super-alloy by electro-deposition of Re/Pt dual films and low-activity aluminizing.The isothermal oxidation behavior of the Re modified β-(Ni,Pt)Al coating and traditional β-(Ni,Pt)Al coating was comparatively studied at 1100 ℃.Apparent spallation of oxide scale was found on the surface of traditional β-(Ni,Pt)Al coating after 300 h isothermal exposure,which mainly resulted from the evaporation of Mo-containing oxides.It is further found that the outward diffusion of Mo from the SC substrate was effectively inhib-ited in the Re modified β-(Ni,Pt)Al coating by forming the σ-MoRe phase both at the coating/superalloy interface and grain boundaries.It is also revealed that the addition of Re can stabilise Mo to form the σ-MoRe phase,allowing the improved oxidation resistance of the Re modified β-(Ni,Pt)Al coating.