The use of small particles to decorate alloy surfaces to prepare powder materials for directed energy deposition (DED) of composites has received significant attention; however, minimal research has been conducted on how this decorative effect influences powder delivery behavior, despite the powder delivery behavior being an important factor in dictating the quality of the composites’ deposition. This work outlines the result of an investigation into the effect of the decorative effect of nanoparticles (nano-carbon) on the feeding behavior of metal powder (pure titanium). The experimental and simulation results show that nano-carbon decreases the collision recovery coefficient of the powder by 31.6%, which weakens the collision behavior between the powder and the nozzle wall, enhancing the convergence of the composite powder and increasing the velocity of the composite powder by 7.8% (experimental value). This study can serve as a foundation for improving the process development of DED-formed composites.

使用小颗粒装饰合金表面以制备用于复合材料定向能量沉积（DED）的粉末材料受到了极大的关注；然而，关于这种装饰效果如何影响粉末输送行为的研究很少，尽管粉末输送行为是决定复合材料沉积质量的重要因素。这项工作概述了研究纳米颗粒（纳米碳）的装饰效果对金属粉末（纯钛）的进料行为的影响的结果。实验和模拟结果表明，纳米碳降低了粉末的碰撞恢复系数31.6%，削弱了粉末与喷嘴壁之间的碰撞行为，增强复合粉末的收敛性，使复合粉末的速度提高7.8%（实验值）。该研究可以作为改进 DED 成型复合材料工艺开发的基础。