Microstructural characteristics and degradation mechanism of the NiCrAlY/CrN/DSM11 system during thermal exposure at 1100 °C

Li, Weizhou; Li, Yueqiao; Sun, Chao; Hu, Zhiliu; Liang, Tianquan; Lai, Wuquan

doi:10.1016/j.jallcom.2010.06.168

Cited by 26 publications

(19 citation statements)

References 17 publications

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“…For oxidation, a scheme proposed by Meier et al for a NiCoCrAlY based bond coat is used [18] which gives the thickness, δ, of the oxide scale as: (2) where Q, T 0 and n are constants equal to 27777.4, 2423.7 K and 0.332, respectively; T is the temperature in K, and t is the time in seconds. The current model assumes that only Al is oxidized at the coating surface, and the diffusion of elements within the oxide is not modelled explicitly.…”

Section: Oxidation Modelmentioning

confidence: 99%

“…As the concentration fields extend with time, the F-D grid zones are expanded dynamically [17] while the oxidation interface was treated as a moving phase boundary, using a published scheme [23]. The boundary condition at the oxidation interface is given by the rate of Al consumption derived from Equation (2). The expansion of grid zones continues until the neighbouring zones overlap (soft impingement), at which point the zones are merged to form a single zone.…”

Section: Grid Schemementioning

confidence: 99%

“…It has recently been shown that compositionally graded and/or multi-layered coating systems [1][2][3] have the potential to provide much improved oxidation and corrosion resistance over single layer coatings for superalloy components used in turbine engines operated under multiple corrosion regimes. Dual layer coatings with two carefully selected MCrAlY layers replacing the single layer of the MCrAlY, however, could utilise established production routines and are a natural extension of current coating systems.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization and Modelling of Ni Based Superalloy Materials with a Dual Layered MCrALY Coating System

Liu¹,

Karunaratne²,

Jepson³

et al. 2012

Superalloys 2012 (Twelfth International Symposium)

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Multilayered MCrAlY type coatings have the potential to be optimised to protect superalloy components against both corrosion and oxidation simultaneously. In this paper, a dual layered coating (NiCr(Co)AlY on top of a NiCoCrAlY coating) has been aged and the microstructural evolution has been observed and quantified using various electron microscopy based techniques. In addition, the microstructural evolution of the coating has been modelled using a diffusion based model capable of predicting the ageing of multilayer coatings. It is demonstrated that the model is reasonably accurate in predicting both the phase and chemical distributions through the coating system during ageing, and therefore has the potential to be used as a design tool for the improvement of future layered coating systems.

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Section: Oxidation Modelmentioning

confidence: 99%

Section: Grid Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization and Modelling of Ni Based Superalloy Materials with a Dual Layered MCrALY Coating System

Liu¹,

Karunaratne²,

Jepson³

et al. 2012

Superalloys 2012 (Twelfth International Symposium)

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“…A wide diversity of coating materials have been successfully applied to protect the surface of these components, such as: cobalt, iron and nickel alloys [2,4,5]. The latter have been especially used due to their outstanding performance under extreme high temperature conditions [5][6][7][8]. Several hardfacing and thermal spraying processes have been used to coat the molds: (i) plasma transferred arc (PTA) and gas tungsten arc welding (GTAW), (ii) flame spraying (FS), high velocity oxy fuel (HVOF) and atmospheric plasma spraying (APS).…”

Section: Introductionmentioning

confidence: 99%

Effect of the substrate dilution on the room and high temperature tribological behaviour of Ni-based coatings deposited by PTA on grey cast iron

Fernandes¹,

Polcar²,

Loureiro³

et al. 2015

Surface and Coatings Technology

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In the present investigation the effect of the substrate dilution on room and high temperature (550 and 700 ºC) tribological behaviour of nickel based hardfaced coating deposited by plasma transferred arc onto a grey cast iron was investigated and compared to the uncoated grey cast iron. At room temperature, the wear loss of coatings was independent of the substrate dilution and similar to the grey cast iron. At high temperatures, coating produced with high dilution displayed the highest wear resistance between all the samples. This is attributed to the formation of a protective tribo-layer resulting from the agglomeration of a high amount of oxide debris due to its lower oxidation resistance when compared to the sample produced with low dilution.

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“…The knowledge of the degradation processes, phase transformations, reaction kinetics and nature of the oxide scale formation in these coatings is important for their use in applied practice to ensure the slow growing TGO scale during oxidation. For this reason isothermal oxidation tests are extensively applied [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Changes in Microstructure of Air Plasma Sprayed M-CrAlY Coatings After Short Thermal Exposure in Argon Atmosphere

et al. 2011

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Conventional air plasma spray technique and two powders, NiCrAlY and CoNiCrAlY, were used to produce the M-CrAlY type of coating on the Inconel 713LC substrate. Two phase coatings, consisting of Ni and/or Co solid solution and NiAl intermetallic phase, were produced. A certain amount of imperfectly melted powder particles, voids and aluminium oxide was also present. After air plasma spraying the coatings were annealed at widely ranging temperatures (650, 800, 1000 and 1150• C) for two hours in argon-flow atmosphere. It was found that the temperature significantly affects the microstructure of resulting coatings. The oxide scale was formed by internal oxidation in a coating region primarily at higher temperatures. In this case, aluminium was depleted from the NiAl phase within the coating region and the Ni, Co, Cr solid solutions and the aluminium oxide started to form rapidly. No interaction was observed after the short thermal exposure below the substrate surface. The microstructure of coatings was recorded by scanning electron microscope. Coating thickness, amount of voids and oxide scale were measured by means of image analysis. The concentration of phases was estimated by energy dispersive microanalysis.

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Microstructural characteristics and degradation mechanism of the NiCrAlY/CrN/DSM11 system during thermal exposure at 1100 °C

Cited by 26 publications

References 17 publications

Characterization and Modelling of Ni Based Superalloy Materials with a Dual Layered MCrALY Coating System

Characterization and Modelling of Ni Based Superalloy Materials with a Dual Layered MCrALY Coating System

Effect of the substrate dilution on the room and high temperature tribological behaviour of Ni-based coatings deposited by PTA on grey cast iron

Changes in Microstructure of Air Plasma Sprayed M-CrAlY Coatings After Short Thermal Exposure in Argon Atmosphere

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