Cyclic oxidation of Pt/Pd-modified aluminide coating on a nickel-based superalloy at 1150°C

Hong, Sung Ju; Hwang, Gil Ho; Han, Wei; Kang, Sung Goon

doi:10.1016/j.intermet.2008.08.014

Cited by 41 publications

(20 citation statements)

References 18 publications

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“…3 shows microstructures of PtAl, PtAlZr100 and PtAlZr300 coatings using SEM and EDS. It was reported that Pt-modified aluminide coating generally consists of two-phase layer (PtAl 2 in bNiAl matrix), one-phase layer (b-NiAl) and interdiffusion layer [4,5,13,14]. In our results, PtAl coating had the general microstructure.…”

Section: Methodssupporting

confidence: 61%

“…Such short circuit paths will be blocked by RE-rich precipitates under an oxidative environment (sufficient oxygen and temperature) if an RE including Zr is added in an alumina-forming alloy such as NiAl, FeAl and so on [17]. As-fabricated PtAl coating consists of PtAl 2 and b-NiAl phases and in addition, PtAl 2 decomposes into b-NiAl under an oxidative environment, and then the PtAl coating subsequently changes to b-NiAl [13,18]. Therefore, in Range 1, except for the initial oxidation period in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Effect of zirconium addition on cyclic oxidation behavior of platinum-modified aluminide coating on nickel-based superalloy

et al. 2010

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Section: Methodssupporting

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Effect of zirconium addition on cyclic oxidation behavior of platinum-modified aluminide coating on nickel-based superalloy

et al. 2010

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“…The blisters decrease oxidation resistance of aluminide coating. Some authors [14] showed, that mass loss of palladium modified aluminide coating is also due to the Kirkendall Effect. Mrowec [19] showed, that palladium at the temperature above 800…”

Section: Resultsmentioning

confidence: 99%

“…The low ductility of PtAl 2 and large difference of thermal expansion coefficients between the substrate and platinum causes the coating degradation under the cyclic thermal stress. Alperine et al [13][14] showed that the palladium modified aluminide coating has higher oxidation and hot corrosion resistance than the conventional aluminide coating. Lehnert et al [12] showed that palladium modified aluminide coating is a low protector due to the formation of pores by the Kirkendall effect.…”

Section: Introductionmentioning

confidence: 99%

Some Properties of Platinum and Palladium Modified Aluminide Coatings Deposited by CVD Method on Nickel-Base Superalloys

Zagula-Yavorska¹,

Sieniawski²,

Gancarczyk³

2012

Archives of Metallurgy and Materials

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In the paper some functional properties (hardness and oxidation resistance) of platinum and palladium modified aluminide coatings deposited by the CVD method on a nickel-based superalloy were determined. The platinum and palladium microlayers, 3 µm thick were deposited by electroplating process. The heat treatment of electroplating microlayers was performed for 2h at the temperature 1050• C in an argon atmosphere as to increase adhesion between the coating and the substrate. The low activity CVD aluminizing process of platinum heat treated coatings 3 µm thick at the 1050• C for 8h using IonBond equipment was performed. The effects of aluminizing process were verified by the use of an optical microscope (microstructure and coating thickness); a scanning electron microscope and an energy dispersive spectroscope (chemical composition of the surface and cross-section of the modified aluminide coating). The hardness measurements on the cross-section of nonmodified and platinum or palladium modified aluminide coatings were performed. Oxidation tests of modified aluminide coatings at the 1100• C for 1000 h in the air atmosphere were carried out. On the grounds of the obtained results it was found that the main phase of the platinum modified aluminide coating is β-(Ni,Pt)Al. Consequently, the palladium modification of aluminide coating causes the formation of β-(Ni,Pd)Al phase. The platinum modified aluminide coating has better oxidation resistance than nonmodified and palladium modified aluminide coating. The XRD analysis of the surface of oxidized platinum modified aluminide coating confirmed the presence of the thermodynamically stable oxide layer Al 2 O 3 , that has good protective properties. The oxides of NiAl 2 O 4 , Al 1.98 Cr 0.02 O 3 and TiO 2 were found on the surface of the palladium modified aluminide coating after 1000 h oxidation at the 1100• C the in the air atmosphere. Keywords: platinum and palladium modified aluminide coating, low-activity CVD process, Ni-base superalloy, oxidation resistance W pracy określono niektóre właściwości użytkowe (twardość oraz żaroodporność) warstwy aluminidkowej modyfikowanej platyną i palladem wytworzonej metodą CVD na podłożu nadstopów niklu, polikrystalicznym Inconel 713 LC i monokrystalicznym -CMSX 4. Powłokę platyny i palladu (grubość -3µm) wytworzono metodą galwaniczną. Poprawę przyczepności powłoki galwanicznej do podłoża uzyskano przez wygrzewanie w temperaturze 1050• C w czasie 2 h w atmosferze argonu. Warstwę aluminidkową wytworzono w procesie niskoaktywnym CVD (temperatura -1050• C, czas -8h). Efekty procesu aluminiowania weryfikowano w badaniach mikroskopowych (mikrostruktura i głębokość warstwy) oraz w analizie składu chemicznego na powierzchni i przekroju warstwy modyfikowanej. Pomiary twardości prowadzono na przekroju niemodyfikowanej warstwy aluminidkowej oraz warstwie modyfikowanej platyną i palladem. Próbę zmęczenia cieplnego wykonano w temperaturze 1100• C i w czasie 1000 h w atmosferze powietrza. Analiza uzyskanych wyników badań pozwała stwierdzić, że g...

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“…e most effective method is the addition of elements or compounds such as Hf, Y, Zr, Cr, Pd, Pt, and SiC [25][26][27][28][29][30][31], which can change the localized concentration of aluminum and reduce its growth rate. Gleeson et al [32] indicate that the addition of Pt has beneficial effects in promoting the formation of a stable Al 2 O 3 scale.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al

Ramos-Hernández

Porcayo-Calderón

Mayén³

et al. 2018

Advances in Materials Science and Engineering

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is paper discusses the effect of the addition of noble metals on the microstructure, mechanism, and oxidation kinetics of the Ni 3 Al intermetallic alloy. Ni 3 Al was doped with 1% (atomic percent) of Au, Ag, Pd, and Pt. Oxidation behavior of the alloys was evaluated at 900, 1000, and 1100°C in O 2 for 24 hours. XRD analysis showed that the addition of noble metals favored the oxide growth on preferential crystallographic planes. In addition, the preferential substitution of the noble metals in the Ni 3 Al structure modifies the surface composition by increasing the Al/Ni ratio. It was observed that most of the alloys showed a subparabolic behavior, and only the intermetallic base and the alloy doped with Ag show a parabolic behavior at 900°C. e developed oxides were analyzed both superficially and in cross section by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDXA). It was evident that only the intermetallic base showed the formation of a duplex oxide scale (Al 2 O 3 /NiO). e alloys doped with noble metals showed the oxide growth practically of pure Al 2 O 3 . is was due to a decrease in the diffusion of the Ni cations because of the presence of the noble metals in the crystalline structure.

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Cyclic oxidation of Pt/Pd-modified aluminide coating on a nickel-based superalloy at 1150°C

Cited by 41 publications

References 18 publications

Effect of zirconium addition on cyclic oxidation behavior of platinum-modified aluminide coating on nickel-based superalloy

Effect of zirconium addition on cyclic oxidation behavior of platinum-modified aluminide coating on nickel-based superalloy

Some Properties of Platinum and Palladium Modified Aluminide Coatings Deposited by CVD Method on Nickel-Base Superalloys

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al

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Cyclic oxidation of Pt/Pd-modified aluminide coating on a nickel-based superalloy at 1150°C

Cited by 41 publications

References 18 publications

Effect of zirconium addition on cyclic oxidation behavior of platinum-modified aluminide coating on nickel-based superalloy

Effect of zirconium addition on cyclic oxidation behavior of platinum-modified aluminide coating on nickel-based superalloy

Some Properties of Platinum and Palladium Modified Aluminide Coatings Deposited by CVD Method on Nickel-Base Superalloys

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni3Al

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Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al