The suspension plasma spray process is now emerging at the industrial scale, and open questions remain regarding the formation of coatings through this process, especially regarding the relationship among particle impact, spreading and build-up into columns. Furthermore, concerns have been raised regarding the behavior of the suspension droplets in the plasma jet stagnation zone since it is a zone where plasma jet streamline directions and velocities are highly disrupted when the plasma jet impinges on a solid surface. In this study, the particle-laden jet streamlines were experimentally observed very closely to a flat surface using a particle image velocimetry technique. Submicron particles were collected in flight to determine which particles contributed to coating growth. The particle mean impact velocity against the surface was determined through image velocimetry and splat dimensions. The impact angles of the particles were also determined, and a correlation was identified with the growth angles of the columnar coating.

悬浮等离子喷涂工艺目前正在工业规模上兴起，关于通过该工艺形成涂层的问题仍然存在悬而未决的问题，特别是关于颗粒撞击，扩散和在色谱柱中堆积之间的关系。此外，由于等离子流撞击固体表面上时等离子流流线方向和速度受到很大破坏，因此等离子流停滞区域中的悬浮液滴的行为引起了人们的关注。在这项研究中，使用粒子图像测速技术在实验上非常接近平坦的表面，观察到了充满粒子的射流流线。在飞行中收集亚微米颗粒，以确定哪些颗粒有助于涂层的生长。颗粒对表面的平均撞击速度是通过图像测速法和splat尺寸确定的。还确定了颗粒的冲击角，并且确定了与柱状涂层的生长角的相关性。