Abstract

A new spray gun for laser spraying has been developed. The gun consists of a center outlet for a wire as a spraying material and two coaxial ring nozzles (inner and outer one) for assist gases. The wire was fed into a carbon dioxide laser beam with a high energy density and melted. The assist gas made the molten wire into fine particles and carried them to a substrate, where they formed a coating as a sprayed layer. In this report, a pure titanium wire was melted and blown in the form of titanium particles by argon, or titanium nitride ones by nitrogen. It has been found that gas flows are important in bringing about stable spraying and a small divergence of the particles, and influence the spraying efficiency and surface roughness.

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