The cyclic oxidation behavior of a Pt modified γ’ nanocrystalline coating at 1150 ℃

Qin, Xiao; Huang, Qinying; Yang, Lanlan; Ren, Peijia; Yang, Yuyi; Wang, Qiwei; Li, Wei; Zhu, Shenglong; Wang, Fuhui

doi:10.1016/j.corsci.2022.110638

Cited by 10 publications

(4 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A spallation spot is detected, which is indicated by red arrows and red dotted ellipses in Figure 5a, b. There is a large number of white particles dispersing on the superalloy surface, indicated by orange arrows in Figure 5a, which is referred to as Ta2O5 [22][23][24][25][26][27]. These Ta2O5 particles can be detected on the surface of the oxide scale and in the oxide scale near the interface, as shown in Figure 5b.…”

Section: Resultsmentioning

confidence: 92%

“…The content of refractory elements (Mo, W, and Re) is extremely high; they should originally be dissolved in the γ phase to improve the mechanical properties at high temperature. Then TCP phases are precipitated in the superalloy, which can be the source of crack initiation and the paths of crack propagation [17,[24][25][26][27][28]. This indicates that the elemental interdiffusion between the NiCrAlY coating and the N5 superalloy during oxidation affects the life of the coating and the substrate superalloy.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The Oxidation Properties of a NiCrAlY Coating Fabricated by Arc Ion Plating

Huang

Yang

et al. 2022

Coatings

Self Cite

View full text Add to dashboard Cite

The microstructures, phase compositions, and high-temperature oxidation behavior of a NiCrAlY coating fabricated by arc ion plating were investigated by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), atomic force microscope (AFM), and X-ray diffractometer (XRD). The results indicate that the NiCrAlY coating was covered by a protective Al2O3 scale with excellent oxidation resistance after oxidation at 1050 °C for 100 h; the β phase rich in Al in the as-deposited coating was transformed into a γ/γ’ phase; the interdiffusion zone (IDZ), secondary reaction zone (SRZ), and needle-like TCP phases were detected in the superalloy substrate beneath the coating.

show abstract

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

The Oxidation Properties of a NiCrAlY Coating Fabricated by Arc Ion Plating

Huang

Yang

et al. 2022

Coatings

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moffat et al [21] studied the oxidation behavior of a carbide network in low or high carbon Co-based superalloys at 1000 • C. They concluded that the carbide in low carbon alloys is more soluble than that in high carbon alloys, thus reducing the continuity of the carbide network and ultimately leading to an increase in the thickness of the oxide layer. Xiao et al [24] studied the cyclic oxidation behavior of Pt-modified γ' nanocrystalline coating at 1150 • C and confirmed that the nanocrystalline structure promoted the formation of α-Al 2 O 3 oxide coating with lower Pt and Al contents, which improved the anti-spalling performance. As a fourth-generation powder metallurgy nickel-based superalloy, FGH4108 is highly alloyed and reinforced by γ' precipitation with a mass fraction of about 60%.…”

Section: Introductionmentioning

confidence: 96%

Oxidation Property of a Fourth-Generation Powder Metallurgy FGH4108 Nickel-Based Superalloy

Zhao

Wang

et al. 2023

Metals

View full text Add to dashboard Cite

Isothermal oxidation kinetics of a fourth-generation powder metallurgy FGH4108 nickel-based superalloy is investigated at 800 °C to 1100 °C by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). At 800 °C and 900 °C, the oxidation kinetic curves of the FGH4108 superalloy follow parabolic law. At 1000 °C, the oxidation kinetic curve follows cubic law. At 1100 °C, the oxidation kinetic curve has two distinct parts: the first part follows a parabolic law, and the second one obeys a linear law. Cross-sectional morphologies and elemental distributions show that the oxide film consists of two parts at 800 °C: the outer layer is a continuous dense protective Cr2O3 oxide film, and the inner layer is a discontinuous Al2O3 oxide layer. At 900–1100 °C, the oxides consist of three layers: the outermost is the oxides of Cr2O3 and TiO2, the middle is a continuous oxide of Al2O3, and the innermost is dotted oxides of TiO2. The thickness of the inner TiO2 oxide layer increases with the increase of oxidation temperature. On this basis, the oxidation behavior of the FGH4108 superalloy at high temperatures is confirmed to be controlled by the diffusion of Cr, Al, Ti, and O. From the aspect of oxidation resistance, the long-term service temperature of the FGH4108 superalloy should not exceed 1000 °C.

show abstract

“…The need for ever-higher mechanical strength at high temperatures has led to the addition of Mo, W, Ta and Re to the composition of Ni-based superalloys, generally at the detriment of the elements Al and Cr, which are very useful for environmental resistance. Consequently, coatings based on β-NiPtAl, Pt-modified γ-Ni + γ'-Ni3Al [1] or MCrAlY (M = Co or/and Ni) [2] are generally used to supply the required environmental resistance of Ni based single-crystal (SX) superalloys. Nevertheless, accurate knowledge of the intrinsic oxidation resistance of the uncoated alloy is necessary for a number of reasons: in the case of cracking or spalling of the coating, in places where the coating is missing (inside the blades for example [3]) or in cases where these alloys would be used uncoated.…”

Section: -Introductionmentioning

confidence: 99%

Short Term Oxidation in HT-SEM of the Pt-containing TROPEA Single Crystal Ni-based Superalloy from 680 to 1000°C

Mathieu,

Podor,

Emo

et al. 2024

Preprint

View full text Add to dashboard Cite

Short-time oxidation of the Ni-based TROPEA single-crystal superalloy was implemented to determine the nature and quantities of transient oxides in the 680–1000°C temperature range. Experiments were carried out in situ in the SEM with reduced air pressure (150 Pa, \(\:{P}_{{O}_{2}}\) ∼ 31.5 Pa) compared to atmospheric conditions (105 Pa, \(\:{P}_{{O}_{2}}\) ∼ 2.1 104 Pa). TEM characterization after oxidation showed the complexity of the oxidation products developed. Aluminum underwent internal oxidation between 680 and 1000°C. During the limited duration of oxidation, the TROPEA alloy only formed a continuous alumina layer at 1000°C. At 680 and 850°C, the low diffusion rate and small amount of Al in the Ni-based single crystal led to the formation of a significant amount of transient oxides such as (Ni,Co)O, compared to the desired chromia or alumina protective oxides. The lower the temperature, the smaller the size of the internal Al2O3 precipitates and the larger the transient oxide crystals, which would lower the resistance of TROPEA to Type II hot corrosion. In contrast after a transient period shorter than 22 hours, during which multiple transient oxide developed, the oxidation resistance would be ensured at 1000°C by the formation of a continuous Al2O3 scale.

show abstract

The cyclic oxidation behavior of a Pt modified γ’ nanocrystalline coating at 1150 ℃

Cited by 10 publications

References 51 publications

The Oxidation Properties of a NiCrAlY Coating Fabricated by Arc Ion Plating

The Oxidation Properties of a NiCrAlY Coating Fabricated by Arc Ion Plating

Oxidation Property of a Fourth-Generation Powder Metallurgy FGH4108 Nickel-Based Superalloy

Short Term Oxidation in HT-SEM of the Pt-containing TROPEA Single Crystal Ni-based Superalloy from 680 to 1000°C

Contact Info

Product

Resources

About