Co-doping effect of Hf and Y on improving cyclic oxidation behavior of (Ni,Pt)Al coating at 1150 °C

Li, S.; Xu, Minggao; Zhang, C.Y.; Niu, Yaran; Zhang, Bao; Zhu, Shenglong; Wang, F.H.

doi:10.1016/j.corsci.2020.109093

Cited by 34 publications

(10 citation statements)

References 54 publications

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“…Reactive elements, such as zirconium, hafnium, yttrium, or cerium, are also applied as modificators in aluminide coatings, as they also improve adhesion and reduce the oxide scale growth rate [14]. This phenomenon is attributed to the segregation of reactive elements on boundaries of oxide grains [15]. It slows down oxygen ions diffusion through the scale and prevents the formation of voids [16].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Pd and Zr Co-Doping on the Microstructure and Oxidation Resistance of Aluminide Coatings on the CMSX-4 Nickel Superalloy

2021

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Pd + Zr co-doped aluminide coatings were deposited on the CMSX-4 nickel superalloy, widely used in the aircraft industry, in order to investigate their microstructure and improvement of oxidation resistance. Palladium was deposited by the electrochemical method, whereas zirconium and aluminum by the chemical vapor deposition (CVD) method. Coatings consist of two zones: the additive and the interdiffusion one. The additive zone contains β–(Ni,Pd)Al phase with some zirconium-rich precipitates close to the coating’s surface, whereas the interdiffusion zone consists of the same β–(Ni,Pd)Al phase with inclusions of refractory elements that diffused from the substrate, so called topologically closed-packed phases. Palladium dissolves in the β–NiAl phase and β–(Ni,Pd)Al phase is being formed. Pd + Zr co-doping improved the oxidation resistance of analysed coatings better than Pd mono-doping. Mechanisms responsible for this phenomenon and the synergistic effect of palladium and zirconium are discussed.

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Section: Introductionmentioning

confidence: 99%

The Influence of Pd and Zr Co-Doping on the Microstructure and Oxidation Resistance of Aluminide Coatings on the CMSX-4 Nickel Superalloy

2021

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“…Previous work found that Hf and Zr co-doping led to lower alumina film growth rate than single-doping in the poly-crystal alloy. It is suggested that Hf and Zr ions co-segregated on alumina grain boundaries during long-term oxidation, and these two ions combined with each other and acted as one ionic cluster which had stronger interaction with Al ions than two individual Hf or Zr ions [37,46]. Therefore, the ‘synergistic effect’ took place and the alumina film growth rate was further diminished.…”

Section: Resultsmentioning

confidence: 99%

Negative effect of Hf and Zr co-doping on alumina film growth of nickel-aluminium single-crystals during thermal cyclic oxidation

Liu

et al. 2021

Corrosion Engineering, Science and Technology

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The microstructure and cyclic oxidation behaviour of Hf and Zr co-doped B2 NiAl single-crystal alloys at 1473 K were investigated. Hf and Zr co-precipitated into one phase during alloy manufacturing. The RE-free single-crystal alloy obtained a double-layered alumina film comprised of outer equiaxed grains and inner columnar grains and exhibited lower oxidation rate than the corresponding poly-crystal alloy, while the co-doped single-crystal alloy displayed higher oxidation rate than the RE-free single-crystal alloy and no synergistic effect was discovered. The effect of Hf and Zr co-doping on the growth behaviour of the alumina film was discussed. It is proposed that the existence of grain boundaries is an important precondition for activating the reactive element effect. The absence of grain boundaries significantly weakened the positive effect of Hf and Zr codoping and distinctly magnified its negative effect on the cyclic oxidation resistance of the alloy in the meantime. Highlights. Cyclic oxidation behaviour of Hf and Zr co-doped NiAl single-crystals is compared.. The undoped alloy obtains a double-layered alumina film during oxidation.. The co-doped alloy shows higher alumina film growth rate than the undoped alloy.. The absence of alloy grain boundaries suppresses the reactive element effect.

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“…Zirconium segregates at the coating/oxide interface and at the oxide grain boundaries and eliminates stresses in the oxide layer. Yttrium, hafnium and cerium are also added into the coatings to improve the oxide adherence during oxidation of coated superalloys [14][15][16][17][18]. These elements can be introduced to the superalloy substrates by melting or to the surface of superalloys by the ion implantation or by the MCrAlY overlay coatings՛ deposition [14].…”

Section: Introductionmentioning

confidence: 99%

“…Hafnium reduced the detrimental sulfur effect on the oxide adherences [15]. Hafnium sulfides free energy formation value is negative, so hafnium dissolved in the aluminide coating and as a result, decreases sulfur activity in the superalloy [16]. Liu et al [17] performed cerium modification of the aluminide coating on the DZ125 superalloy.…”

Section: Introductionmentioning

confidence: 99%

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The effect of precious metals in the NiAl coating on the oxidation resistance of the Inconel 713 superalloy

Zagula-Yavorska

Romanowska

2022

J min metall B Metall

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The rhodium incorporated aluminide coating was produced by the rhodium electroplating (0.5 ?m thick layer) followed by the chemical vapor deposition process on the Inconel 713 superalloy. This coating is composed of the ?-NiAl phase. A part of nickel atoms is replaced by rhodium atoms in the ?-NiAl phase. The plain, rhodium and platinum incorporated aluminide coatings were oxidized at 1100?C under the atmospheric pressure. The oxidation kinetics of the rhodium and platinum incorporated aluminide coatings are similar, but different than oxidation kinetic of the plain coating. The ?-Al2O3 is the main product both in rhodium and platinum modified coatings after 360 h of oxidation. Moreover, the ?-Ni3Al phase, besides the ?-NiAl phase, was identified. The presence of 4 at. % rhodium in the coating provides similar oxidation resistance as the presence of 10-20 at. % platinum. Both rhodium and platinum incorporated aluminide coatings produced by the chemical vapor deposition process offer good oxidation protection of the Inconel 713 superalloy.

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Co-doping effect of Hf and Y on improving cyclic oxidation behavior of (Ni,Pt)Al coating at 1150 °C

Cited by 34 publications

References 54 publications

The Influence of Pd and Zr Co-Doping on the Microstructure and Oxidation Resistance of Aluminide Coatings on the CMSX-4 Nickel Superalloy

The Influence of Pd and Zr Co-Doping on the Microstructure and Oxidation Resistance of Aluminide Coatings on the CMSX-4 Nickel Superalloy

Negative effect of Hf and Zr co-doping on alumina film growth of nickel-aluminium single-crystals during thermal cyclic oxidation

The effect of precious metals in the NiAl coating on the oxidation resistance of the Inconel 713 superalloy

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