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.

Al ₂ O ₃纳米颗粒和MCrAlY/纳米-Al ₂ O ₃纳米复合粉末（M = Ni、Co 或NiCo）是使用高能球磨生产的。MCrAlY/纳米Al ₂ O ₃涂层是通过选择最佳纳米复合粉末作为高速氧燃料热喷涂的原料来沉积的。Al ₂ O ₃纳米颗粒和商业MCrAlY 和MCrAlY/纳米Al ₂ O ₃的形态和微观结构检查使用 X 射线衍射分析、场发射扫描电子显微镜结合电子分散光谱和透射电子显微镜研究了纳米复合粉末。结构研究和 Williamson-Hall 结果表明，48 小时后球磨的 Al ₂ O ₃粉末在原样和球磨的 Al ₂ O _{3 中}具有最小的微晶尺寸和最高的晶格应变，这是由于最佳纳米晶结构。在开发MCrAlY/纳米-Al ₂ O ₃纳米复合粉末的情况下，纳米复合粉末的粒径随着粉末混合物机械研磨时间的增加而减小。