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Failure mechanisms of interfacial coatings (MCrAlY+8YSZ) on high temperature solid particle erosion

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Abstract

In order to study the influence of the bond coat on the erosion resistance of the thermal barrier coating (TBC), two different bond coats (NiCrAlY and NiCoCrAY) were deposited onto Inconel 718 substrate by using Atmospheric Plasma Spray (APS). After that topcoat Yttria Stabilized Zirconia with the Y2O3 content of 8 weight % (8YSZ) coatings were deposited by APS method onto the bond coats also. Alternative test rig compliant with the ASTM G211-14, was used in experiments. These experiments were performed at three different air temperatures (21°C, 300°C and 600°C), three different erosive particle impact angles (30°, 60° and 90°), constant particle impact velocity (~97 m/s) and particle size (400 µm Al2O3) after which, the erosion rate-impact angles results were obtained. Scanning electron microscopy (SEM) images, X-ray diffraction (XRD) analysis, Energy dispersive X-ray (EDX) mapping and EDX elemental analysis were conducted to assess the effectiveness of bond coating and ceramic topcoats to reduce wear at high temperatures. The importance of adhesion at the interface between bond coatings and ceramic topcoats was determined. However, erosion resistance generally increased with temperature, and this resistance effect tended to decrease with the presence of Cobalt.

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Acknowledgements

We would like to thank Konya Technical University Coordinator ship of Scientific Research Projects.

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Authors and Affiliations

  1. Mechanical Engineering Department, Engineering and Natural Science Faculty, KTO Karatay University, Konya, Türkiye

    Musa Demirci

  2. Mechanical Engineering Department, Engineering and Natural Science Faculty, Konya Technical University, Konya, Türkiye

    Mehmet Bagci

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  1. Musa Demirci
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MD contributed to conceptualization, methodology, data processing visualization. Mehmet Bagci contributed to formal analysis, writing—original draft.

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Correspondence to Musa Demirci.

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Demirci, M., Bagci, M. Failure mechanisms of interfacial coatings (MCrAlY+8YSZ) on high temperature solid particle erosion. Sādhanā 49, 163 (2024). https://doi.org/10.1007/s12046-024-02507-x

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