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The effects of powder properties on in-flight particle velocity and deposition process during low pressure cold spray process

机译：低压冷喷涂过程中粉末性质对飞行中粒子速度和沉积过程的影响

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摘要

In cold spray process, impacting velocity and critical velocity of particles dominate the deposition process and coating properties for given materials. The impacting velocity and critical velocity of particles depend on the powder properties and cold spray conditions. In the present study, the in-flight particle velocity of copper powder in low pressure cold spraying was measured using an imaging technique. The effects of particle size and particle morphology on in-flight particle velocity and deposition efficiency were investigated. The critical velocity of copper powder was estimated by combining the in-flight particle velocity and deposition efficiency. The effect of annealing of feedstock powder on deposition and critical velocity was also investigated. The results showed that the irregular shape particle presents higher in-flight velocity than the spherical shape particle under the same condition. For irregular shape particles, the in-flight velocity decreased from 390 to 282 m/s as the particle size increases from 20 to 60 μm. Critical velocities of about 425 m/s and more than 550 m/s were estimated for the feedstock copper powder with spherical and irregular shape morphology, respectively. For the irregular shape particles, the critical velocity decreased from more than 550 to 460 m/s after preheating at 390℃ for 1 h. It was also found that the larger size powder presents a lower critical velocity in this study.
机译：在冷喷涂过程中，颗粒的撞击速度和临界速度决定着给定材料的沉积过程和涂层性能。颗粒的撞击速度和临界速度取决于粉末性质和冷喷涂条件。在本研究中，使用成像技术测量低压冷喷涂中铜粉的飞行中粒子速度。研究了颗粒大小和形态对飞行中颗粒速度和沉积效率的影响。通过结合飞行中的粒子速度和沉积效率来估算铜粉的临界速度。还研究了原料粉末退火对沉积和临界速度的影响。结果表明，在相同条件下，不规则形状的粒子的飞行速度要高于球形粒子。对于不规则形状的颗粒，随着粒径从20微米增加到60微米，飞行中的速度从390 m / s降低到282 m / s。对于具有球形和不规则形状的原料铜粉，估计的临界速度分别为约425 m / s和大于550 m / s。对于不规则形状的颗粒，在390℃下预热1 h后，临界速度从550以上降低到460 m / s。在该研究中还发现，较大尺寸的粉末呈现较低的临界速度。

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