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

doi:10.1016/j.jmst.2020.05.007

Abstract

Abstract:

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

H. Liu, M.M. Xu, S. Li, Z.B. Bao, S.L. Zhu, F.H. Wang. Improving cyclic oxidation resistance of Ni₃Al-based single crystal superalloy with low-diffusion platinum-modified aluminide coating[J]. J. Mater. Sci. Technol., 2020, 54: 132-143.

Figures/Tables 14

Fig. 1. Surface and cross-sectional morphologies of the NiAl (a, b), NiPtAl (c, d) and NiRePtAl (e, f) coatings.

Table 1 Surface root mean roughness (Rq) curves of the two coatings.

R_q	As-received	1100 °C 500 cyc.	1150 °C 200 cyc.
NiPtAl	0.41 ± 0.1	1.21 ± 0.2	3.52 ± 0.3
NiRePtAl	0.4 ± 0.1	0.77 ± 0.1	3.13 ± 0.2

Fig. 2. X-ray diffraction patterns of the as-received NiAl, NiPtAl and NiRePtAl coatings.

Fig. 3. Mass change curves of the coatings during the cyclic oxidation test at 1100 °C.

Fig. 4. The XRD patterns of the coatings after cyclic oxidation test at 1100 °C (NiAl coating after 300 cycles, NiPtAl and NiRePtAl coatings after 500 cycles).

Fig. 5. Surface and cross-sectional morphologies of the coatings after cyclic oxidation test at 1100 °C (NiAl (a, b) coating after 300 cycles, NiPtAl (c, d) and NiRePtAl (e, f) coatings after 500 cycles).

Table 2 Chemical compositions of the marked areas/spots in Fig. 5, Fig. 10 (at.%) by EDS.

At.%	Al	Cr	Ni	Mo	Pt	Re
1	33.97	1.44	58.71	0.91	4.97	0
2	36.92	1.04	56.61	0	5.43	0
3	8.35	10.63	30.13	29.21	0	21.68
4	27.19	1.39	65.26	1.86	4.30	0
5	34.36	1.07	59.79	0	4.78	0
6	6.13	9.42	22.55	36.22	0	25.68

Fig. 6. Elemental mappings of the NiAl coating after cyclic oxidation test at 1100 °C for 300 cycles.

Fig. 7. Elemental mappings of the NiPtAl coating after cyclic oxidation test at 1100 °C for 300 cycles.

Fig. 8. Elemental mappings of the NiRePtAl coating after cyclic oxidation test at 1100 °C for 300 cycles.

Fig. 9. Mass change curves of NiPtAl and NiRePtAl coatings during the cyclic oxidation test at 1150 °C.

Fig. 10. Surface and cross-sectional morphologies of NiPtAl (a and c) and NiRePtAl (b and d) coatings after cyclic oxidation test at 1150 °C for 200 cycles.

Fig. 11. Elemental mappings of the NiPtAl coating after cyclic oxidation test at 1150 °C for 200 cycles.

Fig. 12. Elemental mappings of the NiRePtAl coating after cyclic oxidation test at 1150 °C for 200 cycles.

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

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