The role of Re in improving the oxidation-resistance of a Re modified PtAl coating on Mo-rich single crystal superalloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第23期
论文作者：Jingchen Li Liangliang Wei Jian He Hao Chen Hongbo Guo
摘 要：A novel Re modified β-（Ni,Pt）Al coating was prepared on a Mo-rich Ni3 Al-based single crystal（SC） superalloy 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 inhibited 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 theσ-MoRe phase,allowing the improved oxidation resistance of the Re modified β-（Ni,Pt）Al coating.
Jingchen Li1，Liangliang Wei1，Jian He2,3，Hao Chen4，Hongbo Guo1,2,3
1. School of Materials Science and Engineering,Beihang University2. Research Institute for Frontier Science,Beihang University3. Key Laboratory of High-Temperature Structure Materials and Protective Coatings (Ministry of Industry and Information Technology),Beihang University4. Department of Mechanical,Materials and Manufacturing Engineering,Faculty of Science and Engineering,University of Nottingham Ningbo China
摘 要：A novel Re modified β-（Ni,Pt）Al coating was prepared on a Mo-rich Ni3 Al-based single crystal（SC） superalloy 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 inhibited 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 theσ-MoRe phase,allowing the improved oxidation resistance of the Re modified β-（Ni,Pt）Al coating.
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