Acta Metallurgica Sinica (English Letters) ›› 2021, Vol. 34 ›› Issue (8): 1120-1130.DOI: 10.1007/s40195-020-01185-y
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Ling-Yi Qian1, Jing Wang1, Yun-Shan Guo1, He Liu2, Ze-Bin Bao2()
Received:
2020-07-09
Revised:
2020-09-19
Accepted:
2020-11-09
Online:
2021-01-24
Published:
2021-08-10
Contact:
Ze-Bin Bao
About author:
Ze-Bin Bao, zbbao@imr.ac.cnLing-Yi Qian, Jing Wang, Yun-Shan Guo, He Liu, Ze-Bin Bao. Influences of Iridium and Palladium on Oxidation Resistance of PtAl Coating[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(8): 1120-1130.
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Fig. 3 Surface morphologies of as-deposited Pd coatings after various deposition time: a 45 min, b 60 min. The labelled locations indicate the clusters and cracks after deposition
Element | Content (wt%) |
---|---|
Pd | 96 |
P | 4 |
Table 1 EDS result of electroless plated Pd coating
Element | Content (wt%) |
---|---|
Pd | 96 |
P | 4 |
Fig. 6 Microstructures of Ir-Pt and Pd-Pt coatings on M246 after vacuum diffusion heat treatment at 1100 °C: a Ir-Pt coating after 4 h, b Pd-Pt coating after 1 h
Marked areas | Ni | Al | Ir | Pt | Pd | Cr | Co | W |
---|---|---|---|---|---|---|---|---|
1 | 32.3 | 2.1 | 31.0 | 10.7 | - | 11.5 | 7.1 | 3.8 |
2 | 45.4 | 4.7 | 13.6 | 15.8 | - | 4.0 | 5.5 | 9.3 |
3 | 43.2 | 2.4 | - | 18.8 | 4.0 | 11.1 | 10.8 | 9.4 |
4 | 42.7 | 6.6 | - | 25.2 | 14.4 | 2.2 | 3.9 | 3.7 |
5 | 48.5 | 2.5 | - | 11.1 | 3.7 | 10.0 | 11.2 | 13.0 |
Table 2 EDS results (wt.%) of marked area shown in Fig. 6
Marked areas | Ni | Al | Ir | Pt | Pd | Cr | Co | W |
---|---|---|---|---|---|---|---|---|
1 | 32.3 | 2.1 | 31.0 | 10.7 | - | 11.5 | 7.1 | 3.8 |
2 | 45.4 | 4.7 | 13.6 | 15.8 | - | 4.0 | 5.5 | 9.3 |
3 | 43.2 | 2.4 | - | 18.8 | 4.0 | 11.1 | 10.8 | 9.4 |
4 | 42.7 | 6.6 | - | 25.2 | 14.4 | 2.2 | 3.9 | 3.7 |
5 | 48.5 | 2.5 | - | 11.1 | 3.7 | 10.0 | 11.2 | 13.0 |
Marked areas | Ni | Al | Ir | Pt | Pd | Cr | Co | W | P |
---|---|---|---|---|---|---|---|---|---|
1 | 38.0 | 13.5 | 22.5 | 16.1 | - | 4.5 | 3.8 | - | - |
2 | 50.1 | 8.7 | 12.6 | 13.5 | - | 3.9 | 5.4 | 3.4 | - |
3 | 51.0 | 24.5 | - | 16.5 | - | 2.6 | 4.6 | - | - |
4 | 32.8 | 18.2 | 39.6 | - | - | 2.4 | 5.3 | - | - |
5 | 45.8 | 17.6 | 14.5 | 13.2 | 3.4 | 5.0 | - | - | |
P precipitate | 18.2 | 2.1 | - | - | 2.0 | 14.5 | 12.8 | 13.6 | 16.2 |
Table 3 EDS results (wt.%) of marked areas shown in Fig. 7
Marked areas | Ni | Al | Ir | Pt | Pd | Cr | Co | W | P |
---|---|---|---|---|---|---|---|---|---|
1 | 38.0 | 13.5 | 22.5 | 16.1 | - | 4.5 | 3.8 | - | - |
2 | 50.1 | 8.7 | 12.6 | 13.5 | - | 3.9 | 5.4 | 3.4 | - |
3 | 51.0 | 24.5 | - | 16.5 | - | 2.6 | 4.6 | - | - |
4 | 32.8 | 18.2 | 39.6 | - | - | 2.4 | 5.3 | - | - |
5 | 45.8 | 17.6 | 14.5 | 13.2 | 3.4 | 5.0 | - | - | |
P precipitate | 18.2 | 2.1 | - | - | 2.0 | 14.5 | 12.8 | 13.6 | 16.2 |
Fig. 8 Cross-sectional morphologies and the corresponding Al mapping profiles of the Ir-PtAl coatings: a, b Ir-PtAl-1 h coating, c, d Ir-PtAl-4 h coating
Fig. 11 Cross-sectional morphologies of Ir-PtAl-1 h coating on M246 substrate after cyclic oxidation at 1100 °C for different cycles: a 50 cycles, b 100 cycles
Labelled area | Ni | Al | Ir | Pt | Cr | Co | Ti | W | Mo | O |
---|---|---|---|---|---|---|---|---|---|---|
1 | 51.2 | 5.2 | 10.7 | 6.0 | 6.7 | 7.0 | 1.5 | 8.5 | 2.2 | - |
2 | 54.7 | 3.3 | 6.8 | 6.6 | 7.7 | 8.3 | 0.9 | 10.5 | - | - |
3 | 21.5 | 21.8 | - | - | 7.0 | 4.5 | 0.4 | - | - | 42.6 |
Table 4 EDS results (wt.%) of labelled areas in Fig. 11
Labelled area | Ni | Al | Ir | Pt | Cr | Co | Ti | W | Mo | O |
---|---|---|---|---|---|---|---|---|---|---|
1 | 51.2 | 5.2 | 10.7 | 6.0 | 6.7 | 7.0 | 1.5 | 8.5 | 2.2 | - |
2 | 54.7 | 3.3 | 6.8 | 6.6 | 7.7 | 8.3 | 0.9 | 10.5 | - | - |
3 | 21.5 | 21.8 | - | - | 7.0 | 4.5 | 0.4 | - | - | 42.6 |
Fig. 12 Microstructure evolution of Ir-PtAl-4 h a, c and e and Pd-PtAl b, d and f coatings during the cyclic thermal oxidation test: a, b 50 cycles, c, d 100 cycles, e, f 200 cycles
Phases | Ni | Al | Ir | Pt | Pd | Cr | Co | W |
---|---|---|---|---|---|---|---|---|
β 50 cycles (Ir-PtAl-4 h) | 40.6 | 12.5 | 21.5 | 15.4 | - | 4.2 | 4.1 | - |
β 100 cycles (Ir-PtAl-4 h) | 44.5 | 13.8 | 16.4 | 15.1 | - | 4.4 | 4.4 | - |
β 200 cycles (Ir-PtAl-4 h) | 41.0 | 13.8 | 14.5 | 14.9 | - | 4.4 | 3.7 | - |
β 50 cycles (Pd-PtAl) | 48.7 | 15.0 | - | 13.0 | 14.0 | 4.0 | 4.6 | - |
β 100 cycles (Pd-PtAl) | 47.4 | 14.8 | - | 14.2 | 14.4 | 3.8 | 4.7 | - |
β 200 cycles (Pd-PtAl) | 47.0 | 14.7 | - | 13.5 | 16.3 | 3.8 | 4.0 | - |
γ' 50 cycles (Pd-PtAl) | 59.2 | 9.7 | 9.2 | 5.3 | 3.8 | 6.9 | 4.2 | |
γ' 100 cycles (Pd-PtAl) | 59.9 | 8.9 | - | 9.9 | 4.1 | 4.0 | 6.7 | 4.5 |
γ' 200 cycles (Pd-PtAl) | 61.1 | 8.9 | - | 8.7 | 4.8 | 4.0 | 6.5 | 4.4 |
γ' 100 cycles (Ir-PtAl-4 h) | 59.3 | 8.8 | - | 2.7 | 4.4 | 6.8 | 5.9 | |
γ' 200 cycles (Ir-PtAl-4 h) | 51.2 | 7.2 | 11.9 | 13.5 | 6.6 | 6.5 | - |
Table 5 EDS results (wt.%) of detected β and γ' phases in Ir-PtAl-4 h and Pd-PtAl coatings after thermal cyclic oxidation test
Phases | Ni | Al | Ir | Pt | Pd | Cr | Co | W |
---|---|---|---|---|---|---|---|---|
β 50 cycles (Ir-PtAl-4 h) | 40.6 | 12.5 | 21.5 | 15.4 | - | 4.2 | 4.1 | - |
β 100 cycles (Ir-PtAl-4 h) | 44.5 | 13.8 | 16.4 | 15.1 | - | 4.4 | 4.4 | - |
β 200 cycles (Ir-PtAl-4 h) | 41.0 | 13.8 | 14.5 | 14.9 | - | 4.4 | 3.7 | - |
β 50 cycles (Pd-PtAl) | 48.7 | 15.0 | - | 13.0 | 14.0 | 4.0 | 4.6 | - |
β 100 cycles (Pd-PtAl) | 47.4 | 14.8 | - | 14.2 | 14.4 | 3.8 | 4.7 | - |
β 200 cycles (Pd-PtAl) | 47.0 | 14.7 | - | 13.5 | 16.3 | 3.8 | 4.0 | - |
γ' 50 cycles (Pd-PtAl) | 59.2 | 9.7 | 9.2 | 5.3 | 3.8 | 6.9 | 4.2 | |
γ' 100 cycles (Pd-PtAl) | 59.9 | 8.9 | - | 9.9 | 4.1 | 4.0 | 6.7 | 4.5 |
γ' 200 cycles (Pd-PtAl) | 61.1 | 8.9 | - | 8.7 | 4.8 | 4.0 | 6.5 | 4.4 |
γ' 100 cycles (Ir-PtAl-4 h) | 59.3 | 8.8 | - | 2.7 | 4.4 | 6.8 | 5.9 | |
γ' 200 cycles (Ir-PtAl-4 h) | 51.2 | 7.2 | 11.9 | 13.5 | 6.6 | 6.5 | - |
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