J. Mater. Sci. Technol. ›› 2020, Vol. 54: 132-143.DOI: 10.1016/j.jmst.2020.05.007

• Research Article • Previous Articles     Next Articles

Improving cyclic oxidation resistance of Ni3Al-based single crystal superalloy with low-diffusion platinum-modified aluminide coating

H. Liua,b, M.M. Xua,b, S. Lia,b, Z.B. Baoa,*(), S.L. Zhua, F.H. Wangc   

  1. a Institute of Metal Research, Chinese Academy of Sciences, Wencui Road 62#, Shenyang 110016, China
    b School of Materials Science and Engineering, University of Science and Technology of China, Jinzhai Road 96#, Hefei 230026, China
    c Shenyang National Laboratory for Materials Science, Northeastern University, Wenhua Road 3#, Shenyang 110819, China
  • Received:2019-11-29 Revised:2020-02-11 Accepted:2020-02-13 Published:2020-10-01 Online:2020-10-21
  • Contact: Z.B. Bao


A low-diffusion NiRePtAl coating ((Ni,Pt)Al outer layer in addition to a Re-rich diffusion barrier layer) was prepared on a Ni3Al-base single crystal (SC) superalloy via electroplating and gaseous aluminizing treatments, wherein the electroplating procedures consisted of the composite deposition of Ni-Re followed by electroplating of Pt. In order to perform a comparison with conventional NiAl and (Ni,Pt)Al coatings, the cyclic oxidation performance of the NiRePtAl coating was evaluated at 1100 and 1150 °C. We observed that the oxidation resistance of the NiRePtAl coating was significantly improved by the greater presence of the residual β-NiAl phase in the outer layer and the lesser outward-diffusion of Mo from the substrate. In addition, the coating with the Re-rich diffusion barrier demonstrated a lower extent of interdiffusion into the substrate, where the thickness of the second reaction zone (SRZ) in the substrate alloy decreased by 25 %. The mechanisms responsible for improving the oxidation resistance and decreasing the extent of SRZ formation are discussed, in which a particular attention is paid to the inhibition of the outward diffusion of Mo by the Re-based diffusion barrier.

Key words: Ni3Al-base superalloy Pt-modified aluminide coating, Re-rich diffusion barrier, Cyclic oxidation, Interdiffusion, Second reaction zone