Ag transport in CrN–Ag nanocomposite coatings

Mulligan, C.P.; Papi, P.A.; Gall, Daniel

doi:10.1016/j.tsf.2012.06.082

Cited by 34 publications

(26 citation statements)

References 32 publications

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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%

“…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]. However, for coatings in the Cr-Cu-N system, it is typically found that a metastable solid solution phase of Cu in bcc Cr (with Cu content of up to 60 at.%) will form at low deposition temperatures [26] (e.g.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Edx Line Scan Analysismentioning

confidence: 99%

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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“…The wear rates of the balls decreased by about 50 % for the coatings with the silver addition in comparison with the pure Cr 2 N, and in the case of the coating with 15 % of Ag the decrease was about 75 % (Figure 4). These results were expected since silver can act as a solid lubricant, facilitating the sliding of the balls 12 . In our previous works 11,17 silver particles were well visible on the surface of the coatings after the deposition.…”

Section: Resultsmentioning

confidence: 69%

“…It exhibits a stable chemical behaviour over a wide temperature range as well as in a variety of aggressive environments. Ag is capable to mi-grate to a free surface to form Ag particles providing lubrication above 300°C and, thereby, distinctively reducing the friction coefficient 12 .…”

Section: Introductionmentioning

confidence: 99%

Interaction of Cr2N and Cr2N/Ag thin films with CuZn-brass counterpart during ball-on-disc testing

Bílek¹,

Jurči²,

Dulová³

2015

Mater. Tehnol.

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“…The lubricating function of chromium oxide film were further utilized by many researchers to develop the so-called "chameleon" coating for high temperature application, such as CrN-Ag [26]. 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.…”

Section: Discussionmentioning

confidence: 99%

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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Ag transport in CrN–Ag nanocomposite coatings

Cited by 34 publications

References 32 publications

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

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

Interaction of Cr2N and Cr2N/Ag thin films with CuZn-brass counterpart during ball-on-disc testing

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

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