Cite this article as: |
F. Ghadami, A. Sabour Rouh Aghdam, and S. Ghadami, Characterization of MCrAlY/nano-Al2O3 nanocomposite powder produced by high-energy mechanical milling as feedstock for high-velocity oxygen fuel spraying deposition, Int. J. Miner. Metall. Mater., 28(2021), No. 9, pp. 1534-1543. https://doi.org/10.1007/s12613-020-2113-1 |
F. Ghadami E-mail: f.ghadami@modares.ac.ir
A. Sabour Rouh Aghdam E-mail: sabour01@modares.ac.ir
Al2O3 nanoparticles and MCrAlY/nano-Al2O3 nanocomposite powder (M = Ni, Co, or NiCo) were produced using high-energy ball milling. The MCrAlY/nano-Al2O3 coating was deposited by selecting an optimum nanocomposite powder as feedstock for high-velocity oxygen fuel thermal spraying. The morphological and microstructural examinations of the Al2O3 nanoparticles and the commercial MCrAlY and MCrAlY/nano-Al2O3 nanocomposite powders were investigated using X-ray diffraction analysis, field-emission scanning electron microscopy coupled with electron dispersed spectroscopy, and transmission electron microscopy. 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 among the as-received and ball-milled Al2O3 owing to its optimal nanocrystalline structure. In the case of developing MCrAlY/nano-Al2O3 nanocomposite powder, the particle size of the nanocomposite powders decreased with increasing mechanical-milling duration of the powder mixture.
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