【摘 要】
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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
【机 构】
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School of Materials Science and Engineering,Beihang University,Beijing,100191,China;Research Institu
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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.
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