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Effect of trace Ce on high-temperature oxidation behavior of an Al–Si-coated Ni-based single crystal superalloy

  • Xiao-juan Pang
  • Shu-suo Li
  • Lu Qin
  • Yan-ling PeiEmail author
  • Sheng-kai Gong
Original Paper
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Abstract

Ni-based single crystal superalloy IC21 with different Ce contents was prepared by screw selection method, and Al–Si coatings were prepared by pack cementation. Cyclic oxidation and transient oxidation were carried out at 1150 °C to investigate the effect of Ce on the high-temperature oxidation behavior of Al–Si coatings. After cyclic oxidation at 1150 °C, the addition of trace Ce decreased the mass gain of the Al–Si-coated samples and effectively improved oxidation performance and spallation resistance. In specimens without Ce doping, microstructure examination revealed that bulky γ′-Ni3Al precipitated in oxidized coating because of high Al consumption, and this finding suggests that Ce inhibits the consumption of Al in the coating during oxidation. Ce slows down the transformation of θ-Al2O3 to α-Al2O3 and improves the adhesion of the oxide scale.

Keywords

Single crystal superalloy Trace Ce Al–Si coating Oxidation behavior Al2O3 

Notes

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51371004).

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Copyright information

© China Iron and Steel Research Institute Group 2019

Authors and Affiliations

  • Xiao-juan Pang
    • 1
  • Shu-suo Li
    • 1
  • Lu Qin
    • 1
  • Yan-ling Pei
    • 1
    Email author
  • Sheng-kai Gong
    • 1
  1. 1.School of Materials Science and EngineeringBeihang UniversityBeijingChina

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