Preparation and Isothermal Oxidation Behavior of Zr-Doped, Pt-Modified Aluminide Coating Prepared by a Hybrid Process

Fan, Qixiang; Yu, Hongjun; Wang, T.; Wu, Zhenghuan; Liu, Yanmei

doi:10.3390/coatings8010001

Cited by 12 publications

(5 citation statements)

References 34 publications

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“…When ions of two dopants segregate along grain boundaries in an oxide scale, their interaction with Al ions is stronger than for one dopant's ions, i.e., a synergistic effect is observed [21]. The performed experiments confirmed that Pt + Zr co-doped aluminide coatings have better oxidation resistance and adhesion and lower surface roughness than any single-doped ones [22]. Moreover Zr-rich oxide pegs improve phase stabilities in the coating and reduce oxide scale growth rate [23].…”

Section: Introductionmentioning

confidence: 62%

“…The density of inclusions in the interdiffusion zone is much higher than in the additive zone (Figure 3), which results in a much finer microstructure (Figure 7). Even as the inclusions in the additive zone are fewer than those in the interdiffusion one, and therefore less effective in restricting grain growth, they diminish the formation of voids on the surface [22].…”

Section: Palladium and Zirconium Co-doped Aluminide Coatingmentioning

confidence: 99%

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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: 62%

Section: Palladium and Zirconium Co-doped Aluminide Coatingmentioning

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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“…As Y and Zr atoms could encourage the formation of the stable α-Al 2 O 3 phase and reduce internal stress in the oxide scale as shown in Figure 9, it can be deduced that adding Zr and Y to the Cr-Co modified aluminide coating might increase the oxidation-resistance [19]. Numerous studies reveal that the effects of Y 2 O 3 are generally accepted to be as follows [23,24]: (1) to promote the selective oxidation of chromium by lowering the critical content for the formation of a continuous chromium scale, and (2) to slow down scaling by switching the scaling mechanism from dominant outward chromium diffusion in the absence of RE to dominant inward oxygen diffusion [24].…”

Section: Oxidation Behaviormentioning

confidence: 99%

Oxidation Behavior of Inconel 625 Alloy through Aliminide Diffusion Method Using Y2O3 and ZrO2 Nanoparticles

Jawhar

Abbass

Aziz

et al. 2023

ETJ

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Nano Y 2 O 3 and ZrO 2 particles were used in diffusion coating by the single-step pack cementation process • Effects of Y 2 O 3 and ZrO 2 on mechanical properties and oxidation resistance of coated Inconel 625 superalloy were analyzed • Microstructure of coated IN625 superalloy consists of an outer layer, a transition layer, and an interdiffusion zone • Adding Y 2 O 3 and ZrO 2 to the Cr-Comodified aluminide coating might increase the oxidation resistance The pack cementation process was used to create a type of Y 2 O 3 +ZrO 2 doped Cr-Co-modified aluminide coating that takes advantage of the synergistic effects of nano Y 2 O 3 and ZrO 2 particles. A Ni-based superalloy (type IN625 type) was coated with pack powder containing: Al as a source of aluminum; Cr as a source of chromium, Co as a source of cobalt, NH 4 Cl as a source of activator; nano Y 2 O 3 -ZrO 2 as a source of reactive element oxide; and Al 2 O 3 as a source of filler metal. The process was carried out for 6 hours at 1100 o C temperature. The microstructure characterization of the coating was performed by SEM, EDS, and XRD. It was found that the cross-section of the coating obtained was uniform and free from cracking. The maximum hardness value was found at the outer layer (997H.V.) and decreased toward the core sample core (366H.V.). The coating's microstructure consists of an outer layer, a transition layer, and an IDZ. The average coating thickness is 132.37, 36.11, and 37.65µm for the outer layer, transition layer, and IDZ, respectively. The XRD analysis of the coating system after 6 hours at 1100 o C revealed phases formed by AlNi 3 , CoO, Al-Cr-Co, and Cr 4 NiZr. The n (growth rate time constant) and Kp (parabolic rate constant) values increase with increased oxidation temperature. It was found that adding Zr and Y to the Cr-Co-modified aluminide coating might increase the oxidation resistance.

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“…The coating deposition is caused by the vapors transport via a packed bed (Al2O3) and cross -reactivity on the surface of a substrate. The following are typical pack reactions for a NaClactivated pack [19]:…”

Section: Microstructure Of Zr-modified Aluminide Diffusion Coatingmentioning

confidence: 99%

Enhancing the Oxidation Behavior of Zr-Modified Aluminide Coatings on Inconel 600 at Different Temperatures

Dawood

Salim

2022

KEM

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In the recent search nickel superalloy Inconel 600 was coated with Zr-modified aluminide diffusion coating using pack cementation technique. Diffusion coating was done in a single step utilizing a conversion reaction of 10% Al, 2% ZrO2, 4% NaCl, and 84 percent Al2O3 (wt. percent ) and a simultaneous aluminizing-zirconizing process. The diffusion coating operations were performed in an argon environment at 1050 °C for 10 hours. The test of the isothermal oxidation in dry air was performed on the Inconel Alloy 600 (IA600) without and with Zr-modified aluminide coating for 800-1000 °C. The oxidation kinetic of IA600 and its coated system was found to follow the parabolic law. The activation energy is 243 kJ/mol. for the coated system and 457 kJ/mol. for the uncoated system. XRD analysis show that oxide phases are formed on an uncoated IA600 surface during most of the oxidation exposure conditions are NiO, Cr2O3, Fe2O3, NiCr2O4 and NiFe2O4, , whereas alumina scale is the major oxide that is obtained on the surface of coated samples.

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Preparation and Isothermal Oxidation Behavior of Zr-Doped, Pt-Modified Aluminide Coating Prepared by a Hybrid Process

Cited by 12 publications

References 34 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

Oxidation Behavior of Inconel 625 Alloy through Aliminide Diffusion Method Using Y2O3 and ZrO2 Nanoparticles

Enhancing the Oxidation Behavior of Zr-Modified Aluminide Coatings on Inconel 600 at Different Temperatures

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