In this study, nanostructures were fabricated on sintered copper powders through alloying-dealloying method for investigating and analyzing drop penetration and wetting characteristics. Based on the high-speed video imaging, the kinetics of droplets immersing process were studied for multi-scale composite compact (MCC), featured with the microns for copper particle sizes and nanometers for the surface structures. The comparisons of various sizes of copper powders and different initial falling heights were conducted to explore the effect of porous structures. The results indicated that the nanostructures, with pore size and ligament size of approximately 30 nm and 50 nm respectively, could effectively enhance the hydrophilic performance for the sintered copper compacts. Moreover, larger powder size could lead to faster penetration, while the higher initial falling height facilitated the increase of the maximum spreading diameter of droplet, resulting in lower penetration time.

在这项研究中，通过合金化-脱合金方法在烧结铜粉上制备了纳米结构，以研究和分析液滴的渗透和润湿特性。基于高速视频成像，研究了多尺度复合压块（MCC）的液滴浸没过程动力学，其特征为微米代表铜粒径，而纳米代表表面结构。比较了各种尺寸的铜粉和不同的初始下落高度，以探讨多孔结构的影响。结果表明，纳米结构的孔尺寸和韧带尺寸分别约为30 nm和50 nm，可以有效地提高烧结铜压块的亲水性。此外，较大的粉末尺寸可能会导致更快的渗透，