MoS2 coatings are effectively used in vacuum and in water vapor-free environments because of increased friction coefficient and decreased service life under atmospheric conditions. A lot of different alloy elements (e.g., Ti, Nb, Cr) and compounds (e.g., TiN, TiB2) are used to enhance the friction and wear properties of MoS2 coatings. In this study Ti/TiB2/MoS2 graded-composite coatings (GCC) were deposited by closed-field unbalanced magnetron sputtering (CFUBMS). The structural properties of the coatings were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The hardness of the coatings was measured with the use a microhardness tester. The tribological properties of the coatings were determined under air and vacuum conditions. Ti/TiB2/MoS2 (GCC) have MoS2 (002) and TiB2 (100) reflections. The coatings exhibited a dense and non-columnar structure. Tribological properties of the coatings under air and vacuum conditions significantly affected the hardness, thickness and stoichiometric ratio of elements in the structure. (C) 2014 Elsevier B.V. All rights reserved.