Investigation of monolayer–multilayer PVD nitride coating

A novel criterion, plastic/elastic deformation work (W p /W e ), was introduced to identify the codeformation capacity of chromium-nitrogen (Cr-N) coating and titanium alloy system, which can be related to the coating/substrate adhesion. By changing the N 2 flow ( f N2 ), the Cr-N coatings were deposited on Ti6Al4V (TC4) alloy substrate to obtain Cr(N), Cr 2 N and/or CrN coatings, which could be related to the various deformation capacities. It indicated that the high W p /W e ratios of the metallic Cr(N)/TC4 systems deformed coordinately and attached well. Among the ceramic CrN x /TC4 systems, the single-phase CrN/TC4 exhibited higher W p / W e ratio of 1.71 than 1.52 and 1.61 of the Cr 2 N or Cr 2 N@CrN/TC4 and better adhesion. As a novel criterion, W p /W e ratio indicates the co-deformation capacity of a coating/alloy system, related to the failure mechanism and the adhesion of a coating to the substrate.

Section: Introductionmentioning

confidence: 99%

A novel criterion to identify coatings’ adhesion

Zhou

et al. 2022

“…Wear resistance coatings are used to protect and increase the lifetime of cutting tools, metal forming dies, turbine blades and component surfaces against abrasive wear such as friction and erosion [1][2][3][4][5]. Because of their mechanical properties, excellent tribological and corrosion resistance in harsh environments, transition metal nitrides, carbides and borides, such as TiN, CrN, TiC, TiB 2 , deposited PVD and CVD processes, are widely used as protective coatings [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The effect of duty cycle on the mechanical and electrochemical corrosion properties of multilayer CrN/CrAlN coatings produced by cathodic arc evaporation

Baseri

Mohammadi

Ghatee

et al. 2020

Multilayer CrN/CrAlN coatings were deposited on the 420-SS by the cathodic arc evaporation system with different duty cycles of bias-voltage. The deposited films were characterized by XRD and FESEM techniques. Mechanical, electrochemical, and surface properties of deposited films were studied by nano-indentation, electrochemical, and AFM analysis. Microstructure investigation confirmed the formation of adhesive and dense nanostructure multilayer film.Increasing the duty cycle led to the decrease in the coating grain size and promoted the hardness to 34.1 ± 4 GPa. A clear reduction of size and distribution of macroparticles was observed by using large repulsive force at a high duty cycle. By increasing the duty cycle, the coating deposition rate was increased from 1.23 to 1.38 µm/h and the surface roughness was decreased from 155 to 70 nm. The lower corrosion current density was obtained for the film applied at the 40% duty cycle (0.59 µA cm −2 ), which was about 10-order of magnitude less than the substrate.

“…Earlier studies illustrate that the cyclic nanoimpact tests were conducted on PVD coatings deposited on WC-Co inserts using cube-corner indenters with applied loads above 15 mN [14,[16][17][18][19], wherein the multi-layered coatings depict improved performance [16,20,21]. The literature on impact tests carried out on TiAlSiN nanocomposite coatings is very limited [12,22].…”

Section: Introductionmentioning

confidence: 99%

Fracture behaviour of nc-TiAlN/a-Si₃N₄ nanocomposite coatings under cyclic nano impact testing

Babu

Venkatesh

Rao

et al. 2019

TiN, nanocomposite nc-TiAlN/a-Si 3 N 4 (NC) and multi-layered TiN/NC coatings were deposited on commercially used tungsten carbide-cobalt (WC-Co) based tool material substrates by cathodic arc physical vapour deposition (CA-PVD) technique. The coatings were subjected to cyclic nanoimpact testing with impact loads of 1 and 5 mN. Properties such as fracture probability, (h 1 -h s )/(h f -h 1 ) index and crack morphologies were analysed based on which, the performance order of the coatings was evaluated. It was observed that the multi-layer coating performed better followed by monolithic titanium nitride and nanocomposite coating (TiN/NC > TiN > NC). The order of the coatings so obtained was further compared with their relative performance during real-time machining studies. It was observed during machining that the order was changed to TiN/NC > NC > TiN. The better performance in TiN/ NC coating was due to arresting of cracks formed in NC layer by TiN layer.