CrN–Ag nanocomposite coatings: High-temperature tribological response

Mulligan, C.P.; Blanchet, Thierry A.; Gall, Daniel

doi:10.1016/j.wear.2010.03.015

Cited by 70 publications

(36 citation statements)

References 23 publications

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“…This was ascribed to the diffusion of Ag atoms under the action of heat, and the formation of a lubricating interface layer on the surface of the films. The results are in good agreement with the study by Mulligan et al [28,29] with the high temperature friction reaction of CrN-Ag nanocomposite coatings. With an increase in temperature, the content of Nb 2 O 5 increased gradually, leading into a decrease in friction coefficient of NbCN film and NbCN-Ag composite films.…”

Section: Tribological Properties At Elevated Temperaturesupporting

confidence: 92%

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

et al. 2018

Coatings

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Abstract:In this study, reactive magnetron sputtering was applied for preparing NbCN-Ag films with different Ag additions. Ag contents in the as-deposited NbCN-Ag films were achieved by adjusting Ag target power. The composition, microstructure, mechanical properties, and tribological properties were characterized using energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), high resolution transmission electron microscopy (HRTEM), Raman spectrometry, nano-indentation, and high-temperature sliding wear tests. Results indicated that face-centered cubic (fcc) NbN, hexagonal close-packed (hcp) NbN and fcc Ag, amorphous C and amorphous CN x phase co-existed in the as-deposited NbCN-Ag films. After doping with 2.0 at.% Ag, the hardness and elastic modulus reached a maximum value of 33 GPa and 340 GPa, respectively. Tribological properties were enhanced by adding Ag in NbCN-Ag films at room temperature. When the test temperature rose from 300 to 500 • C, the addition of Ag was found beneficial for the friction properties, showing a lowest friction coefficient of~0.35 for NbCN-12.9 at.% Ag films at 500 • C. This was mainly attributed to the existence of AgO x , NbO x , and AgNbO x lubrication phases that acted as solid lubricants to modify the wear mechanism.

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Section: Tribological Properties At Elevated Temperaturesupporting

confidence: 92%

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

et al. 2018

Coatings

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“…For those CrN based hard composited coatings, the soft metal possessed solid lubricating function at lower temperatures, while the chromium oxide tribo-layer possessed lubricating function at higher temperatures. It is provn that formed chromium oxide film was found to provide a long endurance and friction coefficients within 0.3-0.4 at 400-500 • C in air [27]. This was coincidence with the present study.…”

Section: Discussionsupporting

confidence: 93%

Wear Transition of CrN Coated M50 Steel under High Temperature and Heavy Load

Zhang

Tang

2017

Coatings

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Abstract:The combination of high temperature indentation and wear test provides a useful way to investigate wear of CrN coating and wear transition mechanisms. In this paper, the high temperature hardness of CrN coatings and load bearing capacity, L b , of CrN coated M50 disks were determined from spherical indentation at temperatures up to 500 • C. Wear tests with different normal loads were carried out at the same temperatures as the indentation tests. The results show that wear mechanism of CrN coating changes with external load, P, and temperature, T. Under a tested condition of P < L b and T < 315 • C, abrasive is the dominant wear mechanism for CrN coating. Under a tested condition of P < L b and T ≥ 315 • C, wear of CrN coating transitions into mild oxidation wear due to the lubricating effect of chromium oxide film. Under a tested condition of P > L b and T < 315 • C, wear of CrN coating was controlled by coating fracture. Under a tested condition of P > L b and T ≥ 315 • C, wear of CrN coating transitions into the severe wear mode, due to the tensile fracture of oxidation films, thereby leading to adhesion between CrN coating and tribo-counterpart. The presented method can be helpful in predicting permissible load and working temperature in tribological applications of CrN coating.

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“…600 -700 °C) [21] -and needs to be in excess of 20 at.% to transport sufficiently well to provide adequate solid lubricating benefits [8,18,20,21,25]. The transportation of Ag from inside to the coating surface (and subsequent aggregation) will also be a desired characteristic for antimicrobial coating applications [34,35], particularly when the Ag aggregates are presented in nanocrystalline topography [36].…”

Section: Edx Line Scan Analysismentioning

confidence: 99%

“…Ag or Cu), as a solid lubrication phase, embedded in a hard wear-resistant matrix, such as a transition metal nitride [2][3][4][6][7][8][9], carbide [10,13] or oxide [14][15][16], and mixtures of these ceramics (in ternary/quaternary/nanocomposite coating systems), have all been extensively studied, with the promise of improved tribological performance during transient and/or cyclic temperature changes [17][18][19]. In particular, coatings based on Cr-Ag-N [7,8,[17][18][19][20][21] and Cr-Cu-N [6,22,23] (as two typical coating systems), have been studied. For coatings in the Cr-Ag-N system, it is revealed that Ag precipitates often tend to exhibit a lamellar shape (height/width: ~ 1/2 to 1/3), with a uniform, but isolated distribution in the ceramic nitride matrix of the deposited coating [24,25].…”

Section: Introductionmentioning

confidence: 99%

CrCuAgN PVD nanocomposite coatings: Effects of annealing on coating morphology and nanostructure

Liu

Iamvasant

Liu

et al. 2017

Applied Surface Science

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CrCuAgN PVD nanocomposite coatings were produced using pulsed DC unbalanced magnetron sputtering. This investigation focuses on the effects of post-coat annealing on the surface morphology, phase composition and nanostructure of such coatings. In coatings with nitrogen contents up to 16 at.%, chromium exists as metallic Cr with N in supersaturated solid solution, even after 300 o C and 500 o C post-coat annealing.Annealing at 300 o C did not obviously change the phase composition of both nitrogen-free and nitrogen-containing coatings; however, 500 o C annealing resulted in significant transformation of the nitrogen-containing coatings. The formation of Ag aggregates relates to the (Cu+Ag)/Cr atomic ratio (threshold around 0.2), whereas the formation of Cu aggregates relates to the (Cu+Ag+N)/Cr atomic ratio (threshold around 0.5). The primary annealing-induced changes were reduced solubility of Cu, Ag and N in Cr, and the composition altering from a mixed ultra-fine nanocrystalline and partly amorphous phase constitution to a coarser, but still largely nanocrystalline structure. It was also found that, with sufficient Cu content (> 12 at.%), annealing at a moderately high temperature (e.g. 500 o C) leads to transportation of both Cu and Ag (even at relatively low concentrations of Ag, ≤ 3 at.%) from inside the coating to the coating surface, which resulted in significant reductions in friction coefficient, by over 50% compared to that of the substrate (from 0.31 to 0.14 with a hemispherical diamond indenter, and from 0.83 to 0.40 with an alumina ball counterface, respectively). Results indicate that the addition of both Cu and Ag (in appropriate *Manuscript Click here to view linked References 2 concentrations) to nitrogen-containing chromium is a viable strategy for the development of 'self-replenishing' silver-containing thin film architectures for temperature-dependent solid lubrication requirements or antimicrobial coating applications.

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CrN–Ag nanocomposite coatings: High-temperature tribological response

Cited by 70 publications

References 23 publications

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

Wear Transition of CrN Coated M50 Steel under High Temperature and Heavy Load

CrCuAgN PVD nanocomposite coatings: Effects of annealing on coating morphology and nanostructure

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