120 Research on Titanium Coloring using Laser Irradiation : Improvement repeatability in color marking and realization of wide color space

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  • 120 チタンへのレーザ照射による構造色に関する研究 : 色再現性の向上と広色空間の実現(アディティブ・マニュファクチャリングの生産システム)

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Color marking of titanium by titanium oxide coatings are widely used in many fields such as medical implants because they are environment friendly and safe to human body due to no dyes used. Laser irradiation is an efficient approach to obtain oxide coatings. But it has not been used widely in the industry as it is regarded difficult and not repeatable. In this research, the coloring mechanism of titanium oxide layers generated by pulsed Nd:YAG laser (3rd harmonic: λ=355nm) treatment in air was discussed. A series of colors were obtained by varying the laser irradiation pulse energy. With the assumption of formation of uniform titanium dioxide layer on titanium surface, it was confirmed that observed colors calculated by light interference theory were in good accordance with the experimental ones. For investigating hues, CIE 1931 x-y color space and Surface Profile Meter were used. In conclusion, intensity decrease according to increasing pulse energy.

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