Investigation on the tensile properties of PtAl and PtReAl coated Ni3Al-based single crystal superalloy

Liu, Liang; He, Jian; Wu, Yuting; Li, Jingchen; Wei, Liangliang; Guo, Hongbo

doi:10.1016/j.msea.2023.144750

Cited by 5 publications

(2 citation statements)

References 36 publications

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“…The protection of Pt-Al bond coating is primarily due to the formation of a continuous α-Al 2 O 3 regenerated layer on the surface [7], which offers comprehensive support against high-temperature oxidation and hot corrosion for the entire TBC [8,9]. Meanwhile, the Pt-Al bond coating exhibits superior mechanical properties and excellent oxidation and corrosion resistance [10,11].…”

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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“…Currently, researchers have also conducted some studies on the failure behavior of PtAl coatings under complex muti-field coupling environments [8][9][10][11][12][13][14][15][16][17]. Most of them concentrated on the impact of different loading conditions, such as tension [8][9][10][11], creep [9][10][11][12][13][14][15], fatigue [16][17][18], and thermo-mechanical fatigue [19], on the mechanical properties of PtAl coatings from room temperature to the service temperature. In general, except for high-cycle fatigue at a high temperature, depositing the PtAl coating would decrease the mechanical strength of the substrate superalloy but improve its ductility at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pt on Stress Rupture Properties of Pt-Modified Nickel Aluminide Coatings at 1100 °C

Xue,

Yin,

Deng

et al. 2024

Materials

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Platinum plays a crucial role in the superior high-temperature oxidation resistance of Pt-modified nickel aluminide (PtAl) coatings. However, PtAl coatings usually serve in thermo-mechanical coupling environments. To investigate whether Pt contributes to the high-temperature mechanical properties of PtAl coating, stress rupture tests under 1100 °C/100 MPa were performed on PtAl coatings with varying Pt contents. The different coatings were obtained by changing the thickness of the electroplated Pt layer, followed by a diffusion heat treatment and the aluminizing process in the present work. The results of the stress rupture tests indicated that an increasing Pt content resulted in a significant decrease in the stress rupture life of PtAl-coated superalloys under 1100 °C/100 MPa. Theoretical calculations and microstructural analysis suggested that an increased coating thickness due to the Pt content is not the main reason for this decline. It was found that the cracks generated close to the substrate in high-Pt-coated superalloys accelerated the fracture failure.

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Tensile crack inhibition of a PtReAl coated Ni3Al-based single crystal superalloy after long-term oxidation

Liu

Jiang³

et al. 2023

Journal of Materials Research and Technology

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Investigation on the tensile properties of PtAl and PtReAl coated Ni3Al-based single crystal superalloy

Cited by 5 publications

References 36 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

Effect of Pt on Stress Rupture Properties of Pt-Modified Nickel Aluminide Coatings at 1100 °C

Tensile crack inhibition of a PtReAl coated Ni3Al-based single crystal superalloy after long-term oxidation

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