“…Studies such as these [106,107] highlight the benefits of using these nano-multilayered coatings, especially for extreme tribological applications. Regarding TiAlN based nanolayered films with ZrN, Wang et al [108] studied the influence of Zr 3 N 4 on a nano multilayered TiAlN/Zr 3 N 4 . Additionally, the authors also studied the influence of layer Zr 3 N 4 thickness in the coating's mechanical properties, and, as seen in the studies previously presented, thinner layers promote higher hardness and H/E ratio values.…”
The machining process is still a very relevant process in today’s industry, being used to produce high quality parts for multiple industry sectors. The machining processes are heavily researched, with the focus on the improvement of these processes. One of these process improvements was the creation and implementation of tool coatings in various machining operations. These coatings improved overall process productivity and tool-life, with new coatings being developed for various machining applications. TiAlN coatings are still very present in today’s industry, being used due to its incredible wear behavior at high machining speeds, high mechanical properties, having a high-thermal stability and high corrosion resistance even at high machining temperatures. Novel TiAlN-based coatings doped with Ru, Mo and Ta are currently under investigation, as they show tremendous potential in terms of mechanical properties and wear behavior improvement. With the improvement of deposition technology, recent research seems to focus primarily on the study of nanolayered and nanocomposite TiAlN-based coatings, as the thinner layers improve drastically these coating’s beneficial properties for machining applications. In this review, the recent developments of TiAlN-based coatings are going to be presented, analyzed and their mechanical properties and cutting behavior for the turning and milling processes are compared.
“…Studies such as these [106,107] highlight the benefits of using these nano-multilayered coatings, especially for extreme tribological applications. Regarding TiAlN based nanolayered films with ZrN, Wang et al [108] studied the influence of Zr 3 N 4 on a nano multilayered TiAlN/Zr 3 N 4 . Additionally, the authors also studied the influence of layer Zr 3 N 4 thickness in the coating's mechanical properties, and, as seen in the studies previously presented, thinner layers promote higher hardness and H/E ratio values.…”
The machining process is still a very relevant process in today’s industry, being used to produce high quality parts for multiple industry sectors. The machining processes are heavily researched, with the focus on the improvement of these processes. One of these process improvements was the creation and implementation of tool coatings in various machining operations. These coatings improved overall process productivity and tool-life, with new coatings being developed for various machining applications. TiAlN coatings are still very present in today’s industry, being used due to its incredible wear behavior at high machining speeds, high mechanical properties, having a high-thermal stability and high corrosion resistance even at high machining temperatures. Novel TiAlN-based coatings doped with Ru, Mo and Ta are currently under investigation, as they show tremendous potential in terms of mechanical properties and wear behavior improvement. With the improvement of deposition technology, recent research seems to focus primarily on the study of nanolayered and nanocomposite TiAlN-based coatings, as the thinner layers improve drastically these coating’s beneficial properties for machining applications. In this review, the recent developments of TiAlN-based coatings are going to be presented, analyzed and their mechanical properties and cutting behavior for the turning and milling processes are compared.
“…While after inserting a TiAlN layer into AlCrSiN, the AlCrSiN shows a solid solution cubic phase in the multilayer coating. Therefore, it is shown that the template effect [22-25] plays a role in the growth of AlCrSiN on TiAlN template layers at the interface of nanomultilayer. Figure 2 XRD patterns of AlCrSiN and TiAlN/ AlCrSiN multilayer coatings.…”
TiAlN/AlCrSiN multilayer coatings were prepared by arc ion plating. The implements of various thickness ratio (0, 0.89, 1.04, 1.14 and 1.49) of TiAlN/AlCrSiN on microstructure, mechanical properties and thermal stability of TiAlN/AlCrSiN multilayer coatings were investigated. The AlCrSiN single coating without TiAlN inserted layer exhibits a mixed-phase structure of c-AlN and c-CrN, while TiAlN/AlCrSiN multilayer coatings show a single-phase cubic structure. As the thickness ratio of TiAlN/AlCrSiN increases, the critical load of multilayer coating gradually increases up to 99 N, the hardness decreases and the thermal stability improved. The TiAlN/ AlCrSiN multilayer coating with a high thickness ratio of 1.49 was able to maintain a single (200) preferred c-TiAlN/AlCrN solid solution phase structure after annealing at 800°C in Ar for 2 h. The obtained single-phase cubic structure of AlCrSiN at room temperature and the improved thermal stability properties can be explained by the template effect of TiAlN on the AlCrSiN.
“…Many studies have shown that TiSiN coatings do not reach a hardness of 80GPa but have a higher hardness of >40 GPa [6][7][8]. Multilayer coatings exhibit higher properties than conventional coatings [9][10][11][12]. Multilayer coatings improve the tribological properties and thermal resistance of the films when period (bilayer thickness) is nanometric size [13][14][15][16].…”
The purpose of this study was to optimize V content of TiSiN/TaVN nanomultilayers. TiSiN/TaVN nanomultilayers with various V contents were deposited on 304 stainless steels and Si wafers. The structures and properties of TiSiN/TaVN nanomultilayers were analyzed and characterized. The results show that TiSiN/TaVN nanomultilayers exhibit the face-centered cubic (FCC) structure and preferred orientation on the (111) and (200) planes. With the increasing of V contents, the diffraction peaks of TiSiN/TaVN nanomultilayers were shifted to larger angles. Paralleling to the growth direction of TiSiN/TaVN nanomultilayers, an alternating stress fields are generated to enhance their strength. The hardness and elastic modulus of the nanomultilayers firstly increases and then decreases and friction coefficient firstly decreases and then increases with increasing of V contents. TiSiN/TaVN nanomultilayer with 15 at.% V content indicates the maximum hardness of 27.23GPa, the maximum elastic modulus of 280.96GPa and the highest resistance against plastic deformation. TiSiN/TaVN nanomultilayer with 15 at.% V content has minimum friction coefficient of 0.16 because Magnéli phase oxide V2O5 is formed during the reciprocating sliding friction process and H3/E2 of TiSiN/TaVN nanomultilayer with 15at.% V content is highest.
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