颗粒形貌对低压冷气体喷涂过程中喷雾特性的影响
Influence of the particle morphology on the spray characteristics in low-pressure cold gas process
AI总结：
本研究通过二维和三维成像分析三种铜粉形貌，并结合高速粒子图像测速，揭示了颗粒形貌对低压冷气体喷涂中颗粒速度与射流弥散特性的直接影响，为冷喷涂工艺优化提供依据。
摘要：
本研究通过分析三种具有不同形状和微观结构的铜粉，研究了颗粒形貌对低压冷气体喷涂（LPCGS）中喷雾特性的影响。利用二维和三维成像技术进行了全面的形貌分析。光学显微镜结合图像处理量化了二维投影中的颗粒圆度，而X射线微计算机断层扫描（micro-CT）实现了精确的三维重建，以确定球形度、表面积和体积分布。结果表明，所研究的原料铜粉在颗粒形貌上存在显著差异，与更接近球形的原料相比，不规则形状颗粒表现出更低的圆度和球形度。通过高速粒子图像测速法测量发现，这些形貌差异对喷雾射流内的颗粒速度分布和空间弥散产生了直接影响。不规则颗粒经历了更强的加速，并表现出更集中的喷雾弥散，而球形颗粒达到的最大速度较低，并在射流中表现出更宽的弥散。这些发现凸显了颗粒形貌在优化冷喷涂工艺以用于先进涂层和增材制造应用中的关键作用。
英文摘要：
This study investigates the influence of particle morphology on spray characteristics in low-pressure cold gas spraying (LPCGS) by analyzing three copper powders with distinct shapes and microstructures. A comprehensive morphology analysis was conducted using both 2D and 3D imaging techniques. Light microscopy combined with image processing quantified particle circularity in 2D projections, while X-ray micro-computed tomography (micro-CT) enabled precise 3D reconstructions to determine sphericity, surface area, and volume distributions. The results showed significant variations in the particle morphology of the investigated feedstock copper powders, with irregularly shaped particles exhibiting lower circularity and sphericity compared to more spherical feedstocks. These morphological differences had a direct impact on the particle velocity distributions and spatial dispersion within the spray jet, as measured by high-speed particle image velocimetry. Irregular particles experienced stronger acceleration and exhibited a more focused spray dispersion, whereas spherical particles reached lower maximum velocities and showed a wider dispersion in the jet. These findings highlight the critical role of particle morphology in optimization of cold spray processes for advanced coating and additive manufacturing applications.
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