Long-term oxidation tests on a re-containing MCrAlY coating

Beele, W.; Czech, N.; Quadakkers, Willem J.; Werner, Stefan

doi:10.1016/s0257-8972(97)00473-8

Cited by 85 publications

(23 citation statements)

References 3 publications

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“…Additionally, Re addition accelerated the h-a phase transformation. Beele et al [23] indicated that Re addition did not have a significant direct effect on the growth rates of the alumina scale on a Re-containing MCrAlY coating, however, Re had an indirect effect on longterm oxidation performance of the coating, which tended to decrease the extent of b-phase depletion. In the present case, Re content was higher than 37.5 at.% in the r-phase after Re-Cr-Ni plus Ni-Al coating, and Re content retained to 40.2 at.% after exposure at 900°C.…”

Section: Discussionmentioning

confidence: 99%

Improvement of the Oxidation Resistance of the Single-Crystal Ni-Based TMS-82+ Superalloy by Ni–Al Coatings with/without the Diffusion Barrier

Song

et al. 2010

Oxid Met

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Oxidation behavior of the uncoated base, Ni-Al coated and Re-Cr-Ni plus Ni-Al coated single-crystal (SC) Ni-based TMS-82? superalloy is studied under cyclic air at 900°C for 200 h to assess the oxidation resistance. Regardless of the coating processing, Ni-Al coating is effective in improving the oxidation resistance due to the formation of a continuous a-Al 2 O 3 layer in the scale. For the uncoated base superalloy, the mass-gain curves are fitted by a subparabolic relationship, and complex oxide products including predominately NiO, some 123Oxid Met (2010) 74:287-303 DOI 10.1007 the cyclic exposure environment. The amount of detrimental c 0 -phase and topologically close-packed (TCP) phases in the interdiffusion zone in the coated superalloy with the diffusion barrier is greatly reduced compared with that without the diffusion barrier due to the distinct barrier effect limiting diffusion of elements between the bond-coat and the substrate.

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Section: Discussionmentioning

confidence: 99%

Improvement of the Oxidation Resistance of the Single-Crystal Ni-Based TMS-82+ Superalloy by Ni–Al Coatings with/without the Diffusion Barrier

Song

et al. 2010

Oxid Met

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“…MCrAlY coatings are good alumina formers [1,2]. At high temperature, a continuous and protective alumina scale can form at MCrAlY surface, to protect the coating and base material against high-rate oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…At high temperature, a continuous and protective alumina scale can form at MCrAlY surface, to protect the coating and base material against high-rate oxidation. Dependent on coating composition and temperature, other oxides like Cr 2 O 3 , CoO, NiO, and spinels may also form [1][2][3]. Brandl et al 's results showed that, besides alumina, Cr 2 O 3 formed at 950 °C while NiAl 2 O 4 and CoAl 2 O 4 spinels formed at higher temperature (1050 °C) on a NiCoCrAlYRe coating.…”

Section: Introductionmentioning

confidence: 99%

Some aspects of elemental behaviour in HVOF MCrAlY coatings in high-temperature oxidation

Yuan

Peng

et al. 2015

Surface and Coatings Technology

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Abstract. MCrAlY coatings are widely used to protect superalloys against oxidation and corrosion at high temperature in gas turbine engines. To design a durable MCrAlY coating, the behaviour of alloying elements in coating-superalloy system needs to be better understood. After oxidation tests in temperature range between 900 °C to 1100 °C, the development of the microstructures in the samples was analysed at the coating surface or in areas near the coatingsuperalloy interface. Some interdiffusion simulations were also done to model the diffusion behaviour of alloying elements in different coating-superalloy couples. The results show that both oxidation at the coatings' surface and the elements' diffusion inside of the materials were temperature-and chemical-composition dependent. The behaviour of some minor elements like Y, Hf, Ru and Ir in the oxidation processes was particularly studied by tracking their position and composition in the materials.

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“…The improvement has been somewhat explained in terms of better high-temperature diffusion behavior of Al, that decreasing the extent of β-NiAl phase depletion within the coating and thus the oxidation rate and the scale spallation [14][15][16]. A significant enhancement in thermal fatigue resistance has been also noticed, since the addition of Re seemed to have a beneficial effect on the mechanism of crack formation and propagation [17].…”

Section: Introductionmentioning

confidence: 99%

Morphology and Microstructure of NiCoCrAlYRe Coatings after Thermal Aging and Growth of an Al2O3-Rich Oxide Scale

Girolamo

Brentari²,

Serra

2014

Coatings

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Abstract:The surface of metal parts operating at high temperature in energy production and aerospace industry is typically exposed to thermal stresses and oxidation phenomena. To this aim, plasma spraying was employed to deposit NiCoCrAlYRe coatings on metal substrates. The effects of early-stage oxidation, at ~1100 °C, on their microstructure were investigated. The partial infiltration of oxygen through some open pores and microcracks embedded in coating microstructure locally assisted the formation of a stable Al2O3 scale at the splat boundary, while the diffusion of Cr and Ni and the following growth of Cr2O3, Ni(Cr,Al)2O4 and NiO were restricted to Al depleted isolated areas. At the same time, a continuous, dense and well adherent Al2O3 layer grew on the top-surface, and was somewhere supported by a thin mixed oxide scale mainly composed of Cr2O3 and spinels. Based on these results, the addition of Re to the NiCoCrAlY alloy is able to enhance the oxidation resistance.

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Long-term oxidation tests on a re-containing MCrAlY coating

Cited by 85 publications

References 3 publications

Improvement of the Oxidation Resistance of the Single-Crystal Ni-Based TMS-82+ Superalloy by Ni–Al Coatings with/without the Diffusion Barrier

Improvement of the Oxidation Resistance of the Single-Crystal Ni-Based TMS-82+ Superalloy by Ni–Al Coatings with/without the Diffusion Barrier

Some aspects of elemental behaviour in HVOF MCrAlY coatings in high-temperature oxidation

Morphology and Microstructure of NiCoCrAlYRe Coatings after Thermal Aging and Growth of an Al2O3-Rich Oxide Scale

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