Abstract
The novel nanocomposite Ti-Si-La-N coatings were deposited using the cathodic arc evaporation process. The effect of different lanthanum contents (0–13 at.%) on the chemical composition, structural evolution, and mechanical properties of nanocomposites was studied. Analysis of structure showed that all Ti-Si-La-N series consisted of a crystalline face-centered cubic (fcc) TiN. Coatings were characterized by the (2 0 0)texture, which intensity vastly dropped at La > 6.6 at.% along with the formation of the La-based amorphous phase. The increase in lanthanum content led to a significant decrease in the crystallite size from 6.9 nm to 1.7 nm, and slight enlargement of the lattice parameter from 4.244 Å to 4.285 Å. The highest values of hardness (38.7 ± 1 GPa), wear resistance (H/E = 0.095), and resistance to plastic deformation (H3/E2 = 0.350 GPa) were observed for the coatings with 0.4at.% of lanthanum. In contrast, higher La concentrations caused deterioration of the coating properties.
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