Field Experience of Platinum Aluminide Coated Turbine Blades

Aurrecoechea, José M.; Hsu, L.L.; Kubarych, K.G.

doi:10.1080/10426919508935087

Cited by 8 publications

(2 citation statements)

References 7 publications

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“…The difference of the height of grain cores and boundaries increased and the surface of the coating became rougher [43]. The β-NiAl phase has better oxidation resistance than the γ՛-Ni3Al phase oxidation [41], so the β-NiAl to γ՛-Ni3Al phase transformation increased the coating՛s instability during oxidation and accelerated rumpling of the surface of the coating [44].…”

Section: T Tmentioning

confidence: 99%

The effect of precious metals in the NiAl coating on the oxidation resistance of the Inconel 713 superalloy

Zagula-Yavorska

Romanowska

2022

J min metall B Metall

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The rhodium incorporated aluminide coating was produced by the rhodium electroplating (0.5 ?m thick layer) followed by the chemical vapor deposition process on the Inconel 713 superalloy. This coating is composed of the ?-NiAl phase. A part of nickel atoms is replaced by rhodium atoms in the ?-NiAl phase. The plain, rhodium and platinum incorporated aluminide coatings were oxidized at 1100?C under the atmospheric pressure. The oxidation kinetics of the rhodium and platinum incorporated aluminide coatings are similar, but different than oxidation kinetic of the plain coating. The ?-Al2O3 is the main product both in rhodium and platinum modified coatings after 360 h of oxidation. Moreover, the ?-Ni3Al phase, besides the ?-NiAl phase, was identified. The presence of 4 at. % rhodium in the coating provides similar oxidation resistance as the presence of 10-20 at. % platinum. Both rhodium and platinum incorporated aluminide coatings produced by the chemical vapor deposition process offer good oxidation protection of the Inconel 713 superalloy.

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Section: T Tmentioning

confidence: 99%

The effect of precious metals in the NiAl coating on the oxidation resistance of the Inconel 713 superalloy

Zagula-Yavorska

Romanowska

2022

J min metall B Metall

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“…As simple aluminized coatings exhibit poor resistance to hot corrosion [4], to ensure adequate resistance against hot corrosion, the additions of active elements, including Pt, Cr, Si and Ti etc. are advantageous to modify the coating properties [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Formation Mechanism of Aluminized Coatings on Nickel-Based Superalloys

Pei

Zhang

Niu

et al. 2008

KEM

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Aluminized coatings prepared on nickel-based superalloys can provide good protection against high temperature oxidation and hot corrosion. This study investigated the simple aluminized and silicon-aluminized coatings on nickel-based superalloy K4104. The simple aluminized coating was prepared by pack cementation and the Al-Si coating was prepared by slurry aluminizing, respectively. The microstructure of simple aluminized and Al-Si coatings was analyzed by means of scanning electron microscope (SEM), X-ray diffraction (XRD) and electron probe microanalysis (EPMA). And the formation mechanism of simple aluminized and Al-Si coatings was discussed. The results showed that the simple aluminized coating was about 49 um thick and consisted of three layers. The outer layer mainly consisted of Al-rich β-NiAl. The intermediate layer consisted of Ni-rich β-NiAl and Cr-rich. The inner diffusion layer consisted of Cr-rich and γ’-Ni3Al. The microstructure of Al-Si coating showed that the coating was about 70 um thick and consisted of five layers. The Al-Si coating consisted of CrxSiy, Al-rich β-NiAl, Ni-rich β-NiAl, Cr-rich and γ’-Ni3Al. The microstructure of simple aluminized coating was compared with that of Al-Si coating in order to find out the effect of Si. Owing to the effect of Si, there was a Transition layer in Al-Si coating. The Al-Si coating was thicker than simple aluminized coating. The declining trend of the aluminum concentration in the Al-Si coating was smoother than that of the simple aluminized coating.

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Evolution of Oxide Scale on Aluminide and Pt-Aluminide Coatings Exposed to Type I (870 °C) Hot Corrosion

Shirvani

Rashidghamat

2015

Oxid Met

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Simple aluminide (NiAl) and Pt-modified aluminide (NiPtAl) coatings were produced by a low-temperature high-activity aluminizing (LTHA) technique on a Rene-80 substrate. A Pt layer (6-8 lm) was deposited on the substrate before the LTHA process to prepare the NiPtAl coating. Hot corrosion testing was conducted by a furnace method using Na 2 SO 4 -30 wt% NaCl molten salt at 870°C (i.e., type I hot-corrosion conditions) for 700 h. Corrosion kinetics were determined by measuring the weight change of the specimens at regular intervals of 20 h. Morphology of corroded surfaces and scale chemistry were determined as a function of exposure time. Results indicated that the addition of Pt to aluminide coatings significantly enhances the Type I hot corrosion by promoting the slow growth of a highly adherent oxide on the sample surface. In contrast to the NiAl coating, the NiPtAl coating showed no significant sample weight increase or subsequent catastrophic failure up to 700 h of the hot corrosion exposure. The improved lifetime of NiPtAl coating was attributed in large part to the excellent oxide adherence and the role of Pt in promoting the formation of slow-growing a-Al 2 O 3 . In addition, Pt limits diffusion of substrate refractory elements from substrate into the oxide/ metal interface or the external alumina scale. As a result, the Al 2 O 3 scale on the NiPtAl coating remained adherent and virtually no spallation was observed even after prolonged Type I hot corrosion.

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Field Experience of Platinum Aluminide Coated Turbine Blades

Cited by 8 publications

References 7 publications

The effect of precious metals in the NiAl coating on the oxidation resistance of the Inconel 713 superalloy

The effect of precious metals in the NiAl coating on the oxidation resistance of the Inconel 713 superalloy

Microstructure and Formation Mechanism of Aluminized Coatings on Nickel-Based Superalloys

Evolution of Oxide Scale on Aluminide and Pt-Aluminide Coatings Exposed to Type I (870 °C) Hot Corrosion

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