Abstract
Copper has bactericidal and virus inactivating properties against bacteria, and the use of copper-coated products on the surface
of components such as stainless steel can reduce the risk of bacterial and viral. Among the coating techniques, the multi-beam laser
cladding uses lasers to heat both the powder in flight and the substrate to form a fusion bonded layer. This method requires less heat
input to the substrate than the conventional method of melting powder in a molten pool. In addition, by using a blue diode laser,
which has a high absorption rate for copper, it is possible to form a coating with less energy than a near-infrared laser. In the model
equation for the temperature rise of powder in the multi-beam laser cladding syste m, the temperature of flying powder depends on
the particle size of the powder, so the powder with a particle size distribution will have a temperature distribution when reaching
the substrate. Therefore, it is necessary to select a powder with a particle size below a certain level in order to melt the powder in
flight. In this study, multi-laser beam cladding was performed using pure copper powder with a particle size distribution in which all
particles are above melting when they reach the substrate. The dependence of the yield and dilution of layers formed by this method
on heat input was determined.
