Effective Hf-Pd Co-doped β-NiAl(Cr) coatings for single-crystal superalloys

Adharapurapu, Raghavendra R.; Zhu, Jun; Dheeradhada, Voramon S.; Lipkin, Don M.; Pollock, Tresa M.

doi:10.1016/j.actamat.2014.03.001

Cited by 23 publications

(5 citation statements)

References 65 publications

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“…Besides, HfO 2 particles appeared at the grain boundaries at the TGO/gas interface. These phenomena indicate that Hf addition in the NiAl bond coats effectively changed the TGO growth mechanism, which has been reported widely by previous research[19,23,35].…”

supporting

confidence: 72%

“…This work attempts to develop an economic and high oxidation performance bond coat applied in the industrial gas turbines, together with characterization of RE effect both in the bond coat and superalloy substrate. In this work, Hf is chosen as the model element, which is the most widely used additive element both in superalloy and bond coat [5,18,23]. Four bond coat systems were used: undoped NiAl and Hf-doped NiAl bond coats both deposited on one Hf-free superalloy (DZ125L) and one Hf-containing superalloy (DZ125), respectively.…”

Section: Introductionmentioning

confidence: 99%

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The oxidation performance of plasma-sprayed NiAl bond coat: Effect of Hf addition in bond coat and substrate

Zhao

Luo

Xiao

et al. 2018

Surface and Coatings Technology

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NiAl bond coats with and without Hf addition (0.1 at%) were deposited on two types of superalloy substrates (i.e., DZ125L, no Hf, and DZ125, 0.51 at% Hf) using plasma spraying technique, and isothermally oxidized at 1150 ºC. It demonstrates that Hf addition in the bond coat is more effective than in the superalloy substrate for improving the bond coat oxidation resistance. In addition, though the substrate chemistry could affect the bond coat oxidation performance, this effect was very sensitive to the chemistry of the bond coat -obvious for the RE (reactive element)-free NiAl bond coat, but less obvious for the RE-containing bond coats (NiAlHf and NiCoCrAlY). Moreover, compared with the NiCoCrAlY bond coat, the NiAlHf bond coat showed significantly improved oxidation resistance, regardless of the substrate chemistry, suggesting that NiAlHf bond coat prepared by plasma spraying is a promising candidate for the thermal barrier coating application.

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supporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

The oxidation performance of plasma-sprayed NiAl bond coat: Effect of Hf addition in bond coat and substrate

Zhao

Luo

Xiao

et al. 2018

Surface and Coatings Technology

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“…Therefore, aluminiferous alloys are required and play as bond coating to alleviate this thermal-expansion mismatch and provide oxidation resistance, via thermally grown oxide (TGO) layers. outstanding oxidation property at high temperatures [19][20][21][22][23][24]. Unfortunately, the use of Pt also gives rise to a high cost, and limits the wide application of this material [3,24,25].…”

Section: Thermal Barrier Coatingsmentioning

confidence: 99%

Performance of High-temperature Coatings : Oxidation and Interdiffusion

Sun

2023

Linköping Studies in Science and Technology. Licentiate Thesis

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The use of aluminiferous coatings profoundly improves the service life of superalloys but leads to the microstructural degradation of superalloys and thus the loss of mechanical properties. To solve this trade-off, two strategies were employed in this research. At first, we modified MCrAlY coatings by inducing Ta to reduce the interdiffusion effect on substrate alloys. This strategy was verified by 2000 h/1100 °C oxidation tests in two Ta-containing MCrAlY-IN792 systems. The system with 3.3 wt.% Ta MCrAlY displays an outstanding resistance to γ′ depletion in the substrate and comparable oxidation property in comparison with a reference system of Ta-free MCrAlY-IN792. Increasing Ta to 7.4 wt.% results in reduced oxidation resistance. Thermodynamic simulations revealed the phase-Prof. Ru Lin Peng, for her infinite enthusiasm and support, valuable discussions and constructive comments. And I have learned a lot from her rigorous science cogitation. Secondly, I want to thank my co-supervisor Dr.Xin-Hai Li, from Siemens Industrial Turbomachinery AB and Prof. Johan Moverare for providing the valuable guidance and fruitful discussions. Special thanks are addressed to Pimin Zhang and Kang Yuan, former PhDs from our division, who have done outstanding jobs as a good guidance for my following research. My thanks also go to my collaborators from Charmers University, Dr. Xiaolong Li and Pr. Sheng Guo, who have prepared materials for our project. And I want to thank all my colleagues in Engineering Materials for their kind help during the study. Sincerely, appreciate our head of division, Mattias Calmunger for his warm concern, Jinghao and Rodger for their supporting in my oxidation experiments.

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“…8−10 The excellent oxidation resistance of aluminide coatings mainly depends on the formation of a compact, continuous, and adherent Al 2 O 3 film to inhibit continued oxidation of the substrate alloy under the high-temperature environment. To fulfill the requirements of higher temperatures of the inlet gas in modern turbines, aluminide coatings are usually modified by adding various modification elements, such as Pt, 11−19 Hf, 18−22 Co, 22−24 Si, 24 Pd, 17,22 Y, 25 and Dy. 26 It is widely accepted that the addition of Pt can improve the oxidation resistance and stabilize the phase constitution of the aluminide coatings, which entitles Ptmodified aluminide coatings as one of the most used bond coats in the thermal barrier coating system (TBCs).…”

Section: Introductionmentioning

confidence: 99%

“…Aluminide coatings have been widely used in the aerospace industries for the protection of the hot-section components of gas turbines against oxidation since the late 1960s. − The excellent oxidation resistance of aluminide coatings mainly depends on the formation of a compact, continuous, and adherent Al 2 O 3 film to inhibit continued oxidation of the substrate alloy under the high-temperature environment. To fulfill the requirements of higher temperatures of the inlet gas in modern turbines, aluminide coatings are usually modified by adding various modification elements, such as Pt, − Hf, − Co, − Si, Pd, , Y, and Dy . It is widely accepted that the addition of Pt can improve the oxidation resistance and stabilize the phase constitution of the aluminide coatings, which entitles Pt-modified aluminide coatings as one of the most used bond coats in the thermal barrier coating system (TBCs). , The Pt-modified aluminide coatings are mainly composed of PtAl 2 , β-(Ni,Pt)Al, and γ-Ni/γ′-Ni 3 Al, where γ and γ′ refer to the Ni(Al) substitutional solid solution with the face-centered cubic (FCC) lattice and a random distribution of Ni and Al atoms and the L1 2 -ordered Ni 3 Al intermetallic compound, respectively.…”

Section: Introductionmentioning

confidence: 99%

Selective Oxidation of the Intermetallic Compound PtAl₂ from Ab Initio Thermodynamics

Xie,

Cai,

Zhou

2024

J. Phys. Chem. C

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The atomic structures of pristine and oxygen-covered PtAl 2 (100) and PtAl 2 (110) surfaces are studied by density functional theory modeling. Surface phase diagrams for oxygen adsorption on the two lowindex PtAl 2 surfaces are constructed. We show that the composition for the pristine surfaces is determined by the bulk composition, where the most stable surface configurations are the bulk terminations over the dominant range of the chemical potential of Al examined. By contrast, oxygen adsorption induces surface segregation of Al and leads to selective oxidation of Al upon increasing the oxygen chemical potential. An atomic and dynamic perspective of the oxygen adsorption-induced surface segregation is presented. The aluminum oxide formation results in Pt enrichment in the subsurface region that hinders inward oxygen embedment and outward Al diffusion, thereby serving as a protective layer against further oxidationinduced alloy degradation.

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Effective Hf-Pd Co-doped β-NiAl(Cr) coatings for single-crystal superalloys

Cited by 23 publications

References 65 publications

The oxidation performance of plasma-sprayed NiAl bond coat: Effect of Hf addition in bond coat and substrate

The oxidation performance of plasma-sprayed NiAl bond coat: Effect of Hf addition in bond coat and substrate

Performance of High-temperature Coatings : Oxidation and Interdiffusion

Selective Oxidation of the Intermetallic Compound PtAl₂ from Ab Initio Thermodynamics

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Effective Hf-Pd Co-doped β-NiAl(Cr) coatings for single-crystal superalloys

Cited by 23 publications

References 65 publications

The oxidation performance of plasma-sprayed NiAl bond coat: Effect of Hf addition in bond coat and substrate

The oxidation performance of plasma-sprayed NiAl bond coat: Effect of Hf addition in bond coat and substrate

Performance of High-temperature Coatings : Oxidation and Interdiffusion

Selective Oxidation of the Intermetallic Compound PtAl2 from Ab Initio Thermodynamics

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Selective Oxidation of the Intermetallic Compound PtAl₂ from Ab Initio Thermodynamics