Abstract
Cold spray Aluminium 6061 coating samples were produced with variations of cold spray gas temperatures from 300°C, 400°C, 500°C, 600°C and 700°C, with all other spray parameters constant. The tensile adhesive strengths of the coatings were found to be decreasing with increasing spray temperature, with a marked 70% drop from 400°C to 500°C. A 72% increase in the average coating adhesive strength was observed after T6-heat treatment of non-grit blasted coating samples although the average coating adhesive strength decreased by 9% after stress-relief heat treatment. A 64% increase in the average coating adhesive strength was observed after T6-heat treatment of grit blasted coating samples although the average coating adhesive strength decreased by 20% after stress-relief heat treatment. Coatings were also sprayed at 40° and 60° and subjected to stress-relief and T6 heat treatment. However there were no significant variations in the coating adhesive strengths after heat treatment.
