The effects of Cu feedstock treatment on cold sprayed coatings

The Cu feedstock properties for cold spray have an influence on the coating properties, such as deposition efficiency, morphology and hardness. So, the effects of Cu feedstock treatment with dendritic morphologies for cold spraying were investigated. The cold sprayed Cu coatings using the vacuum-annealed feedstock had much higher deposition efficiency than the air-annealed feedstock, resulting from the combined effect of stress relaxation and reduction of Cu. However, the hardness of Cu coatings was also very different with the Cu feedstock treatment. Therefore, for cold-sprayed Cu coatings using dendritic Cu feedstock, it was confirmed that the treatment of the feedstock played a very important role in the cold-spraying process.