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(Ni,Pd)Al coating, prepared by low pressure pack cementation on the Ni-base superalloy M38 where Pd-20 wt pct Nialloy was predeposited, consists of a single β-(Ni,Pd)Al phase. The initial isothermal oxidation behavior of (Ni,Pd)Alcoating was investigated by TGA, XRD, SEM/EDS at 800～1100℃. Results show that oxidation kinetics accordpreferably with parabolic law at 800, 900 and 1100℃, but not at 1000’C.θ-Al_2O_3 was observed at 800～1100℃. Itis found that Pd plays an important role in accelerating the diffusion of Ti from the substrate to the coating surfacein the aluminide coating.
(Ni, Pd) Al coating, prepared by low pressure pack cementation on the Ni-base superalloy M38 where Pd-20 wt pct Nialloy was predeposited, consists of a single β- (Ni, Pd) Al phase. of (Ni, Pd) Alcoating was investigated by TGA, XRD, SEM / EDS at 800-1100 ° C Results show that oxidation kinetics accordpreferably with parabolic law at 800, 900 and 1100 ° C but not at 1000’C.θ-Al 2 O 3 was observed at 800 ~ 1100 ° C. Itis found that Pd plays an important role in accelerating the diffusion of Ti from the substrate to the coating surface in the aluminide coating.