Spraying TiN by a Combined Laser and Low-Pressure Plasma Spray System
A. Ohmori, S. Hirano, and K, Kamada
The formation of a TiN-Ti composite coating by thermal spraying of titanium powder with laser processing of the subsequent coating in a low-pressure N2 atmosphere was examined. A low-pressure plasma spray system was used in combination with a CO2 laser. First, the coating was plasma sprayed onto a mild steel substrate using a N2 plasma jet and titanium powder in a controlled low-pressure Nz atmosphere. The coating was then irradiated with a CO2 laser beam in a N2 atmosphere, and the coating was heated with a N2 plasma jet, The amount of TiN formed in the coating was characterized by X-ray diffraction analysis. The influence of plasma spraying conditions such as plasma power, flow of plasma operating gases, chamber pressure, and laser irradiating conditions on the formation of TiN was investigated. The effect of TiN formation in the titanium coating on Vickers hardness of the coatings was examined. It was evident that coating hardness increased with an increase in TiN content in the coating and that a TiN-Ti
composite coating with a hardness of more than 1200 HV can be obtained with the use of laser irradiation processing.
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