Micro and Macro-Tribology Behavior of a Hierarchical Architecture of a Multilayer TaN/Ta Hard Coating

Abstract

The micro- and macro-tribological behaviors of a novel hierarchical TaN/Ta coating deposited on Ti6Al4V biomedical alloy by direct current magnetron sputtering were analyzed in the present work. This analysis was associated with the morphological, structural, and mechanical properties, as well as the roughness changes during and after the tribological tests. The wear track of the coating after the macro-tribology tests was evaluated by Raman spectroscopy in order to detect the compounds formed as a result of the tribo-reactions that occurred during the tests. Micro- and macro-tribology behaviors showed a significant wear rate reduction of the hierarchical coating in comparison to the Ti6Al4V substrate. For the case of the micro-tribology tests, this reduction was attributed to the high hardness of the coating (31.4 GPa); however, this hardness caused a considerable increment in the friction coefficient. On the other hand, the macro-tribology performance was associated with the hardness and the ability of the hierarchical architecture to prevent the propagation of cracks. Moreover, the friction coefficient increased considerably at the end of the test; this increment was associated with the tantalum oxides in the wear track detected by Raman spectroscopy.

Features of Tribooxidation of the High-Entropy Coating (AlCrZrTiTa)N during Dry High-Speed Cutting

“…Computer data processing of the vibrational spectra made it possible to identify the specific types of interatomic bonds forming during tribooxidation. Spectra interpretation was carried out by comparing known experimental and calculated data presented in [18,[20][21][22][23][24][25][26][27]. At 130 m of cutting on the coating surface in the initial stage, the Cr-N interatomic bonds are oxidized.…”

Structure, mechanical properties and oxidation resistance of iso and non-iso architected TiN/Cr multilayers coatings deposited by magnetron sputtering

“…M1 sample with hierarchical architecture did show a tendency to improve deformation resistance, suggesting that its distribution order of layers may improve tribological performance, as evidenced by Rivera-Tello group 10,30 . Such effect is related to its highest hardness value of 17.9 GPa, an increment that must be attributed to decreasing the period size towards the surface.…”

Investigation on indentation, scratch, friction characteristics with hydrogen embrittlement of plasma ion nitrided Al alloy for hydrogen valve of fuel cell electric vehicle

“…Rivera-Tello classified the running-in period into three stages. 32) The first stage is a section in which a relatively low friction coefficient value is maintained, and in this section, the coating layer is maintained without being destroyed. The second stage is a section in which the friction coefficient value rises rapidly, and this is a stage in which the coating layer begins to be destroyed.…”