Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 05, 2021 - September 08, 2021
Substrate pre-treatment using pulsed laser ablation has been reported as one of the attractive techniques to improve the deposition efficiency and bonding strength of a metal coating fabricated by low pressure cold spraying. In this study, the effect of laser treatment on the deposition efficiency was examined for copper coatings on pre-oxidized copper substrates under different oxidation temperatures. Nd:YAG laser was applied to the oxidized substrates to remove the surface oxide film. The result shows that the laser treatment has little effect on the copper deposition efficiency on the copper substrate oxidized under 200 degrees Celsius. The deposition efficiency for the first cold spray traverse decreases significantly on the substrates oxidized under 400 degrees Celsius and the coating delamination was observed during the cold spraying. This lower deposition efficiency and coating adhesion strength can be attributed to the substrate softening by an annealing effect and substrate re-oxidation by the laser treatment which prevents particles from adhering to the substrate.
