Effect of Parameters to the Coating Formation during Cold Spray Process

Abstract

In this study, the effects of parameters such as substrate hardness, substrate surface roughness and stand-off distance to the coatings formation and properties of the coatings during cold spraying process were examined. For this purpose, coatings were deposited onto the copper substrate with using of commercially available copper powder. Substrate hardness of 55 HV, 107 HV and 140 HV were obtained by heat treatment and deformation hardening methods. Different substrate surface roughness was obtained by using of SiC emery papers which have different grits and stand-off distance during cold spray process was manipulated as 5, 10, 20 and 30 mm. After the production of the coatings, characterisation procedures were performed by microstructural observations which are optical and scanning electron microscope surveys, porosity concentrations, coating thickness and hardness measurement.

Influence of processing conditions on the mechanical, tribological and fatigue performance of cold spray coating: a review

“…The second condition is that the substrate must be placed at a distance where the velocities of the gas remain higher as compared to the particle velocity at the impact. Cetin et al [129] investigated the influence of varying SOD (5, 10, 20 and 30 mm) on the property of cold-sprayed copper coatings on copper substrates having distinct hardness (55HV, 107HV and 140HV). The results showed that the best coating properties were achieved at an optimum stand-off distance of 20 mm.…”

Repairing Casting Defects by High Pressure Cold Spraying Method

“…Defective Samples Non--Defective Samples Figure 24: SEM images of the coatings produced on the substrate with different stand-off distance. [26] Further, it was found that increasing the stand-off distance up to 20 mm reduced the porosity concentration and increased coating thickness. [26] Figure 25: (a) Stand-off distance-coating thickness relation, (b) Stand-off distance-porosity concentration relation.…”

“…[26] Further, it was found that increasing the stand-off distance up to 20 mm reduced the porosity concentration and increased coating thickness. [26] Figure 25: (a) Stand-off distance-coating thickness relation, (b) Stand-off distance-porosity concentration relation. [26] In the current study, cold spray was done manually and therefore chances of variation in stand-off distance are present.…”

“…Cetin et. al [26] studied the effect of stand-off distance on the coating structure and amount of porosity present. In that study a surface was cold sprayed at stand-off distances of 5, 10, 20 and 30 mm.…”

“…[26] Figure 25: (a) Stand-off distance-coating thickness relation, (b) Stand-off distance-porosity concentration relation. [26] In the current study, cold spray was done manually and therefore chances of variation in stand-off distance are present. Since the stand-off was not monitored it is impossible to say if this had an effect on the results.…”