TiCN/TiNbCN multilayer coatings with enhanced mechanical properties

Design of hard surfaces with metal (Hf/V) nitride multinanolayers

“…It has been demonstrated that the grains of the multilayered coatings are smaller than those of coatings with low bilayer period because the Ar + ions bombardment on the coatings stimulates a greater number of nucleation places, given the reduction of individual thicknesses for each layer when the bilayer period is reduced and bilayer numbers are increased. This implicates a decrease in the entire surface roughness [13]. The research took into account that the grain size is affected by changes in grain size of inner layers (HfN/VN) as a function of reduced bilayer period Λ or increased bilayer number n. Many authors have reported a correlation between AFM and XRD results [13] because AFM analysis delivers surface information (with lateral resolution), and XRD analysis collects information from the space around the normal vector on the surface (from a cross-section).…”

“…This implicates a decrease in the entire surface roughness [13]. The research took into account that the grain size is affected by changes in grain size of inner layers (HfN/VN) as a function of reduced bilayer period Λ or increased bilayer number n. Many authors have reported a correlation between AFM and XRD results [13] because AFM analysis delivers surface information (with lateral resolution), and XRD analysis collects information from the space around the normal vector on the surface (from a cross-section). If this is taken into account, it is possible to consider that physical vapor deposition (PVD) coating columns can grow "vertically" from the substrate to the "top" and can change their cross-section when bilayer thickness is modified; therefore, significant changes in the grain size and surface roughness are evident.…”

“…The mechanical properties enhancement can be associated with the improved hardness by using HfN/VN nanometric multilayered materials. Many authors have used the HallPetch effect to explain the material hardening [2,13,20]. Therefore, it is possible to apply the Hall-Petch effect when the ceramic materials, as hard multilayered coatings with Λ > 5.2 nm, are obtained.…”

“…3). The enhancement of mechanical properties for HfN/VN multilayers results from the increment of hardness values, as shown in multilayer-type coatings for diverse material systems (e.g., TiN/VN, TiCN/TiNbCN, and TiC/TiB 2 ) [7,13,19]. The H values of the HfN/VN multilayered coatings measured by nanoindentation results (see Figs.…”

Design and construction of an equipment for micoro-abrasion-corrosion test in biological simulated enviromments

“…Titanium nitrides are the best known among these. Others, however, such as titanium and niobium carbides, are already being implemented with very little study of their tribological properties [14][15][16]. Furthermore, combinations of materials with varying properties have been used in order to diminish the harmful effects generated by prosthetic parts.…”