Modification of NiCoCrAlY with Pt: Part I. Effect of Pt depositing location and cyclic oxidation performance

doi:10.1016/j.jmst.2018.09.039

Abstract

Abstract:

Pt layers of 5?μm in thickness were electroplated before or after depositing NiCoCrAlY coating by arc ion plating (AIP) aiming for identifying the effect of Pt enriching position on microstructure and cyclic oxidation behavior of Pt modified NiCoCrAlY coatings. Al-rich zones formed at the same position of Pt-rich zones for both modified coatings due to uphill diffusion of Al driven by Pt. Cyclic oxidation tests at 1000 and 1100?°C indicated that oxidation resistance of NiCoCrAlY was improved by Pt modification via different mechanisms: at surface, Pt-rich zone promoted selective oxidation of Al to form α-Al₂O₃, whilst at coating/substrate interface Pt-rich zone acted as effective diffusion barrier for titanium. Roles of Pt played in enhancing the oxidation performance of various Pt-modified NiCoCrAlY coating were investigated.

Key words: Cyclic oxidation, Pt-modification, NiCoCrAlY, Electron probe micro-analysis (EPMA)

Yingfei Yang, Hongrui Yao, Zebin Bao, Pan Ren, Wei Li. Modification of NiCoCrAlY with Pt: Part I. Effect of Pt depositing location and cyclic oxidation performance[J]. J. Mater. Sci. Technol., 2019, 35(3): 341-349.

Figures/Tables 12

Fig. 1. Schematic drawing of preparation of the three coatings.

Fig. 2. Cross-sectional morphologies for the three coatings after vacuum-annealing at 1070?°C for 4?h: Pt-free NiCoCrAlY (a), Pt?+?NiCoCrAlY (b) and NiCoCrAlY?+?Pt (c).

Table 1 Compositions of various zones for the two Pt-modified NiCoCrAlY coatings as shown in Fig. 2 (by EDS, at.%).

Coatings	Pt?+?NiCoCrAlY			NiCoCrAlY?+?Pt
Zones	I	II	III	I	II	III
Al	11.5	28.6	14.7	33.6	11.6	8.7
Cr	26.4	12.0	19.5	8.7	24.4	23.9
Co	18.0	5.0	8.1	5.8	14.0	15.2
Ni	37.1	29.2	34.2	31.5	34.3	42.0
Ta	0.2	0.6	1.2	-	0.6	0.8
W	-	0.3	-	0.2	-	0.7
Pt	6.8	24.4	18.8	18.5	13.1	6.8
Ti	-	-	2.1	1.4	1.3	1.3
Mo	-	-	1.5	0.3	0.9	0.6

Fig. 3. EPMA results for the three coatings after vacuum-annealing at 1070?°C for 4?h: Pt-free NiCoCrAlY (a), Pt?+?NiCoCrAlY (b) and NiCoCrAlY?+?Pt (c).

Fig. 4. XRD patterns of the three coatings after vacuum-annealing at 1070?°C for 4?h.

Fig. 5. Mass change curves of the three coatings during cyclic oxidation at 1000?°C (a) and XRD patterns after cyclic oxidation at 1000?°C for 500 cycles (b).

Fig. 6. Surface and cross-sectional morphologies of various coating after cyclic oxidation at 1000?°C for 500 cycles: Pt-free NiCoCrAlY (a and d), Pt?+?NiCoCrAlY (b and e) and NiCoCrAlY?+?Pt (c and f).

Fig. 7. EPMA results for the three coatings after cyclic oxidation at 1000?°C for 500 cycles: Pt-free NiCoCrAlY (a), Pt?+?NiCoCrAlY (b) and NiCoCrAlY?+?Pt (c).

Fig. 8. Mass change curves of the three coatings during cyclic oxidation at 1100?°C (a) and XRD patterns after cyclic oxidation at 1100?°C for 200 cycles (b).

Fig. 9. Cross-sectional morphologies of different coatings after cyclic oxidation at 1100?°C for 200 cycles: Pt-free NiCoCrAlY (a), Pt?+?NiCoCrAlY (b) and NiCoCrAlY?+?Pt (c).

Fig. 10. EPMA results of selected elements for Pt?+?NiCoCrAlY coating after cyclic oxidation at 1100?°C for 200 cycles.

Fig. 11. EPMA results of selected elements for NiCoCrAlY?+?Pt coating after cyclic oxidation at 1100?°C for 200 cycles.

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