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Development of novel titanium nitride-based decorative coatings by calcium addition
Authors:A. HodrojJ.F. Pierson
Affiliation:Institut Jean Lamour (CNRS UMR 7198), Département CP2S, Ecole des Mines, Parc de Saurupt, CS 14234, 54042 Nancy cedex, France
Abstract:Calcium was added into titanium nitride coatings deposited using a hybrid magnetron sputtering-arc evaporation process. The calcium content in the films was adjusted by the variation of the pulsed DC current applied to the Ca sputtering target. X-ray diffraction analyses suggested that the increase of the calcium content induced the partial substitution of titanium atoms by calcium ones in the TiN lattice and a refinement of the grain size. Optical reflectance investigations showed that the absorption band of TiN was shifted towards higher wavelengths and that (Ti,Ca)N coatings may be suitable for decorative applications. Finally, the decrease of the film reflectivity was interpreted as a consequence of a free electron concentration decrease as confirmed from electrical resistivity measurements.
Keywords:Decorative coatings   Structure   Arc evaporation   Reactive sputtering
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