Microstructure studies of air-plasma-spray-deposited CoNiCrAlY coatings before and after thermal cyclic loading for high-temperature application

Dipak Kumar, K. N. Pandey, Dipak Kumar Das

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    Dipak Kumar, K. N. Pandey, and Dipak Kumar Das, Microstructure studies of air-plasma-spray-deposited CoNiCrAlY coatings before and after thermal cyclic loading for high-temperature application, Int. J. Miner. Metall. Mater., 23(2016), No. 8, pp.934-942. https://dx.doi.org/10.1007/s12613-016-1309-x
    Dipak Kumar, K. N. Pandey, and Dipak Kumar Das, Microstructure studies of air-plasma-spray-deposited CoNiCrAlY coatings before and after thermal cyclic loading for high-temperature application, Int. J. Miner. Metall. Mater., 23(2016), No. 8, pp.934-942. https://dx.doi.org/10.1007/s12613-016-1309-x
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    Microstructure studies of air-plasma-spray-deposited CoNiCrAlY coatings before and after thermal cyclic loading for high-temperature application

    • Mechanical Engineering Department, Motilal Nehru National Institute of Technology, Allahabad, 211004, India

    • Defense Metallurgical Research Laboratory, Hyderabad, 500058, India

    基金项目: 

    The authors acknowledge the testing facilities of XRD and SEM provided by the Center for Interdisciplinary Research (CIR), Motilal Nehru National Institute of Technology, Allahabad. The financial support provided by Technical Education Quality Improvement Programme-II (TEQIP-II) at MNNIT Allahabad is also gratefully acknowledged.

      通信作者:

      Dipak Kumar E-mail: dipakmnnit@gmail.com

    中文摘要

    In the present study, bond-coats for thermal barrier coatings were deposited via air plasma spraying (APS) techniques onto Inconel 800 and Hastelloy C-276 alloy substrates. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and atomic force microscopy (AFM) were used to investigate the phases and microstructure of the as-sprayed, APS-deposited CoNiCrAlY bond-coatings. The aim of this work was to study the suitability of the bond-coat materials for high temperature applications. Confirmation of nanoscale grains of the γ/γ′-phase was obtained by TEM, high-resolution TEM, and AFM. We concluded that these changes result from the plastic deformation of the bond-coat during the deposition, resulting in CoNiCrAlY bond-coatings with excellent thermal cyclic resistance suitable for use in high-temperature applications. Cyclic oxidative stability was observed to also depend on the underlying metallic alloy substrate.

     

    Microstructure studies of air-plasma-spray-deposited CoNiCrAlY coatings before and after thermal cyclic loading for high-temperature application

    Author Affilications

      • Mechanical Engineering Department, Motilal Nehru National Institute of Technology, Allahabad, 211004, India

      • Defense Metallurgical Research Laboratory, Hyderabad, 500058, India

    • Funds: 

      The authors acknowledge the testing facilities of XRD and SEM provided by the Center for Interdisciplinary Research (CIR), Motilal Nehru National Institute of Technology, Allahabad. The financial support provided by Technical Education Quality Improvement Programme-II (TEQIP-II) at MNNIT Allahabad is also gratefully acknowledged.

    • Received: 24 February 2016; Revised: 11 April 2016; Accepted: 12 April 2016;
    In the present study, bond-coats for thermal barrier coatings were deposited via air plasma spraying (APS) techniques onto Inconel 800 and Hastelloy C-276 alloy substrates. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and atomic force microscopy (AFM) were used to investigate the phases and microstructure of the as-sprayed, APS-deposited CoNiCrAlY bond-coatings. The aim of this work was to study the suitability of the bond-coat materials for high temperature applications. Confirmation of nanoscale grains of the γ/γ′-phase was obtained by TEM, high-resolution TEM, and AFM. We concluded that these changes result from the plastic deformation of the bond-coat during the deposition, resulting in CoNiCrAlY bond-coatings with excellent thermal cyclic resistance suitable for use in high-temperature applications. Cyclic oxidative stability was observed to also depend on the underlying metallic alloy substrate.

     

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