J Mater Sci Technol ›› 2003, Vol. 19 ›› Issue (03): 213-217.

• Research Articles • Previous Articles     Next Articles

Oxidation Behevior of Pd-Modified Aluminide Coating at High Temperature

Mengjin LI, Xiaofeng SUN, Hengrong GUAN, Xiaoxia JIANG, Zhuangqi HU   

  1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2003-05-28 Published:2009-10-10
  • Contact: Mengjin LI

Abstract: (Ni,Pd)Al coating, prepared by low pressure pack cementation on the Ni-base superalloy M38 where Pd-20 wt pct Ni alloy was predeposited, consists of a single β-(Ni,Pd)Al phase. The initial isothermal oxidation behavior of (Ni,Pd)Al coating was investigated by TGA, XRD, SEM/EDS at 800-1100℃. Results show that oxidation kinetics accord preferably with parabolic law at 800, 900 and 1100℃, but not at 1000℃. β-Al2O3 was observed at 800-1100℃. It is found that Pd plays an important role in accelerating the diffusion of Ti from the substrate to the coating surface in the aluminide coating.

Key words: (Ni, Pd)Al coating, High temperature oxidation, Oxidation kinetics, β-Al2O3