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Research Article

Characterization of MCrAlY/nano-Al2O3 nanocomposite powder produced by high-energy mechanical-milling as feedstock for HVOF spraying deposition

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  • Received: 23 March 2020Revised: 27 May 2020Accepted: 1 June 2020Available online: 3 June 2020
  • In this study, Al2O3 nanoparticles, as well as MCrAlY/nano-Al2O3 nanocomposite powder were produced using a high-energy ball-milling process. In addition, the MCrAlY/nano-Al2O3 coating was deposited by selecting an optimum nanocomposite powder as feedstock using high-velocity oxy-fuel (HVOF) thermal spraying technique. The morphological and microstructural examinations of Al2O3 nanoparticles, as well as the commercial MCrAlY and MCrAlY/nano-Al2O3 nanocomposite powders, were investigated using X-ray diffraction (XRD) analysis, field emission scanning electron microscope (FESEM) equipped with electron dispersed spectroscopy (EDS) analysis and transmission electron microscope (TEM). The structural investigations and Williamson-Hall results demonstrated that the ball-milled Al2O3 powder after 48 h has the smallest crystallite size and the highest amount of lattice strain compared to all other as-received and ball-milled Al2O3 owing to its optimal nanocrystalline structure. Besides, in the case of developing MCrAlY/nano-Al2O3 nanocomposite powder, with increasing mechanical-milling duration, the particle size of the nanocomposite powders was decreased.
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    [2] Hai-yan Yu,Xiao-lin Pan,Yong-pan Tian, and Gan-feng Tu, Mineral transition and formation mechanism of calcium aluminate compounds in CaO−Al2O3−Na2O system during high-temperature sintering, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-019-1951-1
    [3] Seyed Rahim Kiahosseini and Hossein Ahmadian, Effect of residual structural strain caused by the addition of Co3O4 nanoparticles on the structural, hardness and magnetic properties of an Al/Co3O4 nanocomposite produced by powder metallurgy, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-019-1917-3
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Characterization of MCrAlY/nano-Al2O3 nanocomposite powder produced by high-energy mechanical-milling as feedstock for HVOF spraying deposition

  • Corresponding authors:

    Farzin Ghadami    E-mail: f.ghadami@modares.ac.ir

    A. Sabour Rouh Aghdam    E-mail: sabour01@modares.ac.ir

  • Department of Materials Engineering, Tarbiat Modares University, Tehran, P.O. Box:14115-143, Tehran, Iran

Abstract: In this study, Al2O3 nanoparticles, as well as MCrAlY/nano-Al2O3 nanocomposite powder were produced using a high-energy ball-milling process. In addition, the MCrAlY/nano-Al2O3 coating was deposited by selecting an optimum nanocomposite powder as feedstock using high-velocity oxy-fuel (HVOF) thermal spraying technique. The morphological and microstructural examinations of Al2O3 nanoparticles, as well as the commercial MCrAlY and MCrAlY/nano-Al2O3 nanocomposite powders, were investigated using X-ray diffraction (XRD) analysis, field emission scanning electron microscope (FESEM) equipped with electron dispersed spectroscopy (EDS) analysis and transmission electron microscope (TEM). The structural investigations and Williamson-Hall results demonstrated that the ball-milled Al2O3 powder after 48 h has the smallest crystallite size and the highest amount of lattice strain compared to all other as-received and ball-milled Al2O3 owing to its optimal nanocrystalline structure. Besides, in the case of developing MCrAlY/nano-Al2O3 nanocomposite powder, with increasing mechanical-milling duration, the particle size of the nanocomposite powders was decreased.

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