Fatigue behavior of a freestanding Pt-aluminide (PtAl) bond coat at ambient temperature

Kumawat, Mahesh K.; Sarkar, Rajdeep; Jayaram, Vikram; Alam, Md. Zafir

doi:10.1016/j.surfcoat.2021.127787

Cited by 7 publications

(4 citation statements)

References 31 publications

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“…As a crucial element in safeguarding turbine blades, the Pt-Al bond coating is required to endure cyclic attacks of high-temperature, high-speed, and high-pressure gas. Due to the susceptibility of Pt-Al bond coatings to brittle fracture, the fatigue behavior of Pt-Al bond coating was evaluated by Mahesh et al [12].…”

Section: Introductionmentioning

confidence: 99%

On the Thermal Shock Resistance and Failure Mechanism of the Pt-Modified Aluminide Bond Coating

Xie,

Liu,

et al. 2024

Coatings

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The failure mechanism of the Pt-modified aluminide (Pt-Al) bond coating (β-(Ni, Pt)Al coating) in a simulated service environment has seldom been investigated. Based on a self-developed thermal barrier coating service environment simulator, a thermal shock experiment of single-phase Pt-Al bond coating on DD419 substrate at a temperature of 1170 °C was conducted combined with a real-time monitoring infrared thermal imager. The lifespan and failure mechanism of the coating are analyzed in detail. The results reveal that specimens of the Pt-Al bond coating, subjected to three repeated tests, exhibit failure after 650, 528, and 793 thermal shock cycles at 1170 °C, respectively. After failure, the contents of Pt and Al elements in the peeled region are lower than those in the unpeeled area, and a diffusion zone emerges in the bond coating. The failure mechanism of the Pt-Al bond coating during the thermal shock test can be attributed to three main aspects: (1) the diffusion and consumption of the Pt element reduced the oxidation resistance of the Pt-Al bond coating; (2) the diffusion and depletion of elemental Al causes a phase change in the coating, leading to the failure of the coating; (3) thermal stresses are generated in the Pt-Al bonded coating during the thermal shock test, which ultimately leads to wrinkling.

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Section: Introductionmentioning

confidence: 99%

On the Thermal Shock Resistance and Failure Mechanism of the Pt-Modified Aluminide Bond Coating

Xie,

Liu,

et al. 2024

Coatings

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“…Furthermore, this TGO layer is known to cause delamination of the top coat. To address this problem, research is being actively conducted on composite aluminide bond coats with Pt, Hf, and so on added to the aluminide layer [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Oxidation-Induced Changes in the Lattice Structure of YSZ Deposited by EB-PVD in High-Vacuum Conditions

Lee,

2023

Processes

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Yttria-stabilized zirconia (YSZ), a thermal barrier coating material characterized by low thermal conductivity, is typically deposited via electron beam-physical vapor deposition. Notably, oxygen depletion occurs during this process, causing color changes in YSZ. Therefore, YSZ is speculated to undergo phase transformation during this process, which demands careful consideration owing to its effect on the life of thermal coatings. To study this phenomenon, bulk samples were prepared, subjected to vacuum heat treatment to induce oxygen depletion, and followed by oxidative heat treatment. Experimental results showed that the color of the samples changed to black after the vacuum heat treatment and to a lighter color after the oxidative heat treatment. In addition, X-ray diffraction and Raman analyses were performed. The monoclinic phase formation was confirmed during the vacuum heat treatment; however, it disappeared after the oxidation heat treatment. The coating obtained in a high vacuum atmosphere exhibited a black color and cubic phase, which changed to a bright color and tetragonal phase after the oxidation heat treatment.

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“…Up to now, platinum is commonly used modifier of aluminide coatings. It is considered that platinum addition improves the oxide layer adherence to the coating [10], inhibits the voids formation under the oxide layer [11], accelerates aluminum diffusivity and favors fast formation of α-Al2O3 [12]. Layensa et al [9] suggest that palladium and iridium act similarly to platinum in the oxidation improvement of aluminide coatings.…”

Section: Introductionmentioning

confidence: 99%

“…The crucial issue in improving oxidation resistance of protective coatings is successful implementation of the proper amount of modifiers [8][9][10][11][12][13][14][15][16][17][18][19][20]. Oxidation resistance of modified aluminide coatings strongly depends on the correctly carried out electroplating and aluminizing processes.…”

Section: Introductionmentioning

confidence: 99%

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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Fatigue behavior of a freestanding Pt-aluminide (PtAl) bond coat at ambient temperature

Cited by 7 publications

References 31 publications

On the Thermal Shock Resistance and Failure Mechanism of the Pt-Modified Aluminide Bond Coating

On the Thermal Shock Resistance and Failure Mechanism of the Pt-Modified Aluminide Bond Coating

Oxidation-Induced Changes in the Lattice Structure of YSZ Deposited by EB-PVD in High-Vacuum Conditions

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

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