To make metal coatings with the thickness of sub-millimeter by irradiating pulsed Nd:YAG laser on metal targets was studied. We noted “laser spattering of molten particles” process using the high pulse-energy laser. This is effective compared with the conventional physical vapor process that is based on vaporized ultra-fine particle generation in vacuum, because the energy required melting the material is much lower than that of vaporizing it.
In this process the substrate is irradiated at the same time with another laser to make the coating closer and the adhesion stronger. We studied the productivity of molten particles of metals (Fe, Ni, Cr, Mo, W, etc.), the morphology of the coatings. This process was applied to making the wear-resistant coatings such as cast iron -molybdenum compound coatings. They showed good wear-characteristics.