Benefits of Zr addition to oxidation resistance of a single-phase (Ni,Pt)Al coating at 1373 K

doi:10.1016/j.jmst.2019.03.013

Abstract

Abstract:

A single-phase (Ni,Pt)Al coating with lean addition of Zr was prepared by co-electroplating of Pt-Zr composite plating and subsequent gaseous aluminization treatments. Isothermal and cyclic oxidation behavior of the Zr-doped (Ni,Pt)Al coating samples was assessed at 1373 K in static air in comparison with plain nickel aluminide (NiAl) and normal (Ni,Pt)Al coatings. Results indicated that Zr-doped (Ni,Pt)Al coating demonstrated a lower oxidation rate constant and reduced tendency of oxide scale spallation as well as surface rumpling, in which the enhanced oxidation performance was mainly attributed to the segregation of Zr at oxide scale grain boundaries and the improved Young’s modulus of the coating. Besides, the addition of Zr effectively delayed oxide phase transformation of Al₂O₃ from θ phase to α phase in the early oxidation stage and coating degradation of β-NiAl to γ'-Ni₃Al in the stable oxidation stage.

Key words: Aluminide coating, RE elements, Oxidation, Microstructure evolution, Thermally grown oxide

Chengyang Jiang, Lingyi Qian, Min Feng, He Liu, Zebin Bao, Minghui Chen, Shenglong Zhu, Fuhui Wang. Benefits of Zr addition to oxidation resistance of a single-phase (Ni,Pt)Al coating at 1373 K[J]. J. Mater. Sci. Technol., 2019, 35(7): 1334-1344.

Figures/Tables 13

Fig. 1. Mass gain (a) and square of mass gain (b) curves of NiAl, (Ni,Pt)Al and Zr-doped (Ni,Pt)Al coating specimens versus the oxidation time at 1373 K, where the inserted graph shows the mass change during the early 20 h oxidation by thermally gravity analysis (TGA).

Fig. 2. Surface morphologies of (Ni,Pt)Al (a: 1 h, c: 5 h) and Zr-doped (Ni,Pt)Al (b: 1 h, d: 5 h) coating samples after the isothermal oxidation test at 1373 K.

Table 1 EDS results for the tagged area in Fig. 2a-d (in at.%).

Area	Al	Cr	Co	Ni	Pt	O
1	34.74	1.99	3.40	39.44	5.90	14.53
2	31.04	0.37	0.54	8.16	0.82	59.06
3	33.20	/	/	0.36	/	66.45
4	28.07	/	/	0.22	/	71.72
5	34.81	/	/	0.36	/	64.83
6	33.89	/	/	0.31	/	65.82

Fig. 3. Luminescence spectra obtained from the oxides grown on (Ni,Pt)Al and Zr-doped (Ni,Pt)Al after isothermal oxidation for 1 and 5 h at 1373 K.

Fig. 4. Surface and cross-sectional morphologies of NiAl (a and d), (Ni,Pt)Al (b and e) and Zr-doped (Ni,Pt)Al (c and f) coating specimens after isothermal oxidation at 1373 K for 300 h.

Fig. 5. STEM-EDS mapping images showing the distributions of Al, O, Ta and Zr in the oxide scale formed on Zr-doped (Ni,Pt)Al coating after isothermal oxidation at 1373 K for 300 h, which clearly demonstrates that the presence of Zr-rich particle along the grain boundary matched with Ta.

Fig. 6. Mass change curves of NiAl, (Ni,Pt) Al and Zr-doped (Ni,Pt)Al coating specimens during the cyclic oxidation test at 1373 K.

Fig. 7. Cross-sectional morphologies of NiAl (a: 100 cyc., d: 200 cyc.), (Ni,Pt)Al (b: 100 cyc., e: 200 cyc.) and Zr-doped (Ni,Pt)Al (c: 100 cyc., f: 200 cyc.) coating specimens after cyclic oxidation for different cycles at 1373 K.

Fig. 8. Surface and cross-sectional morphologies of NiAl (a and d), (Ni,Pt)Al (b and e) and Zr-doped (Ni,Pt)Al (c and f) coating specimens after cyclic oxidation for 800 cycles at 1373 K.

Fig. 9. 3D topography and surface root mean square roughness (Rq/nm) of (Ni,Pt)Al (a: 0 cyc., c: 200 cyc., e: 800 cyc.) and Zr-doped (Ni,Pt)Al (b: 0 cyc., d: 200 cyc., f: 800 cyc.) coating specimens after certain cyclic oxidation at 1373 K.

Fig. 10. Relative roughness changes of normal (Ni,Pt)Al and Zr-doped (Ni,Pt)Al coating specimens during the cyclic oxidation test at 1373 K.

Table 2 Weight changes of normal and Zr-doped (Ni,Pt)Al coating samples after isothermal and cyclic oxidation for 300 h.

	Isothermal oxidation for 300 h (mg cm^-2)	Cyclic oxidation for 360 cycles (mg cm^-2)	Weight of spallation (mg cm^-2)
Normal (Ni,Pt)Al	1.40	0.37	1.03
Zr-doped (Ni,Pt)Al	0.82	0.34	0.48

Fig. 11. Young’s modulus and hardness of conventional, Zr- and Hf- doped (Ni,Pt)Al coatings.

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