Role of Pt content in the microstructural development and oxidation performance of Pt–aluminide coatings produced using a high-activity aluminizing process

Gopal, K.; Das, Dipak K.; Singh, Vakil; Joshi, Shrikant V.

doi:10.1016/s0921-5093(98)00655-8

Cited by 101 publications

(34 citation statements)

References 17 publications

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“…Platinum modified aluminide coatings have better oxidation resistance than palladium modified ones. This phenomena is confirmed by Krishna et al and Wang et al [10,11]. The higher oxidation resistance of platinum modified aluminide coating is due to the accelerated formation of the thermal stable Al 2 O 3 oxide on its surface.…”

Section: Resultsmentioning

confidence: 53%

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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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Section: Resultsmentioning

confidence: 53%

“…Moreover, platinum leads to formation of the PtAl 2 phase in the coating microstructure [10][11][12]. 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.…”

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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“…Hot corrosion resistance of aluminide coatings is improved by the addition of modifying elements like Pt [67,68], Cr [69,70] and Si [72].…”

Section: Hot Corrosion Ofpt-modified Alloys/coatings and Mcraly-basedmentioning

confidence: 99%

“…Platinum addition has been found to improve Type I hot corrosion and oxidation resistance of [-NiAl coatings [67,68,72,73]. Indeed, addition of Pt tends to reduce surface spallation by promoting the slow growth of extremely adherent cc-A1 2 0 3 scale [68].…”

Section: Hot Corrosion Ofpt-modified Alloys/coatings and Mcraly-basedmentioning

confidence: 99%

Optimizing the Hot-Corrosion Resistance-of-Novel gamma-Ni+gamma-prime-Ni3A1-Based Alloys and Coatings

Gleeson¹

2006

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT ABSTRACTHigh temperature degradation by hot corrosion (650-1000 C) and/or oxidation (>1000 C) can severely reduce the longevity of advanced gas turbine engine components. The protection of high-temperature components against hot corrosion or oxidation is typically conferred by the application of either a diffusion or overlay metallic coating that is able to form a continuous, adherent, and slow growing oxide scale. There are currently no coatings that provide adequate protection to both hot corrosion and oxidation. This study assesses and advances the performance of novel modified gamma-Ni + gamma-prime Ni3AI alloys and coatings. Significant progress was achieved in this study towards the targeted goal of establishing a metallic coating that is highly resistant to both hot corrosion and high temperature oxidation. High temperature degradation by hot corrosion (650-1000'C) and/or oxidation (>1000°C) can severely reduce the longevity of advanced gas turbine engine components. The protection of high-temperature components against hot corrosion or oxidation is typically conferred by the application of either a diffusion or overlay metallic coating that is able to form a continuous, adherent, and slow growing oxide scale. However, as is shown in this study, the resistance of state-of-the-art commercial Pt-modified P3-NiA1 diffusion aluminides and CoCrAIY-based overlay coatings against both Type I (i.e., 900 0 C) and Type II (i.e., 705TC) hot corrosion is limited. Thus, there are currently no coatings that provide adequate protection to both hot corrosion and oxidation. There is indeed a particular need for such protective coatings because many advanced aero, marine, and industrial gas-turbines operate in both hot corrosion and oxidation regimes in their duty cycle. Gleeson et al. [1] recently reported that a wide range Pt+Hf-modified y'-Ni 3 Al + yNi alloy compositions form a thin, planar, adherent, and slow growing A1 2 0 3 scale. In fact, the results reported suggest that Pt+Hf-modified y'+y coatings offer a viable superior alternative to P-NiAl(Pt)-based coatings. Thus, a main aim of the present study was to establish and assess optimum target y' +y...

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“…Among bond-coat materials, a PtAl has led to the widespread application for TBCs, and some excellent properties were reported, such as to promote protective Al 2 O 3 formation, to suppress void formation along the scale, and to enhance adhesion between the scale and the coating. 5) Application of Ir based alloys for bond-coats has been proposed by the authors' group. [6][7][8][9][10][11][12][13] As one of these approaches, oxidation and hot corrosion resistances of PtIr-Al alloy systems were evaluated, and Ir addition to PtAl bond-coat was revealed to enhance oxidation and hot corrosion resistances.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hf Addition on Oxidation Properties of Pt-Ir Modified Aluminide Coating

et al. 2007

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In the present study, the effect of Hf addition on oxidation kinetics of Pt-Ir modified aluminide coatings was investigated. Pt-15 at%Ir and Pt-15 at%Ir with trace amount of Hf films with 7$8 mm thick were deposited on a Ni-based single crystal superalloy TMS-82+ using magnetron sputtering, followed by a diffusion treatment and conventional Al pack cementation. While there were no significant microstructual differences observed in as aluminized specimens, cyclic oxidation test at 1423 K revealed clear advantages of Hf addition. Hf containing coatings showed smaller mass change with retarded surface rumpling during cyclic oxidation test. These results confirmed the beneficial effects of Hf addition reported for other alloy systems such as Pt modified -0 coatings and Pt modified aluminide coatings.

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Role of Pt content in the microstructural development and oxidation performance of Pt–aluminide coatings produced using a high-activity aluminizing process

Cited by 101 publications

References 17 publications

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

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

Optimizing the Hot-Corrosion Resistance-of-Novel gamma-Ni+gamma-prime-Ni3A1-Based Alloys and Coatings

Effect of Hf Addition on Oxidation Properties of Pt-Ir Modified Aluminide Coating

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