Influence of Size and Mixing ratio of Micro-Forging Particle on Al Alloy Coating Structure via an in-situ MF Cold Spray with Simultaneous Injection of Powder form Axial / Radial Directions of Nozzle

In our laboratory, we have developed a method to simultaneously inject different powders from the central axis direction (A / I) and radial direction (R / I) of the cold spray nozzle and are producing a composite coating by this method. In the previous research of our laboratory, an Al-12Si alloy coating with excellent wear resistance was produced by Micro-Forging Assisted Cold Spray using the simultaneous nozzle injection method of powder in the axial and radial directions. Here, Al-12Si alloy, which has excellent wear resistance, was used for the coating-formed particles, and stainless steel was used for the MF particles. However, because the MF particles were hollow, they remained in the coating. In this paper, we evaluated the effect on the coating structure of using solid (non-hole) MF powder and increasing the mixing ratio of MF powder. At the same time, the behavior of gas and particles by CFD was also investigated.