Tribological behaviour and residual stress of electrodeposited Ni/Cu multilayer films on stainless steel substrate

In this study, Cu thin films with layer thicknesses of 5, 25, and 50 nm were prepared by DC magnetron-sputtering method and their three dimensional (3-D) surface topography were investigated. Concretely, the 3-D surface roughness of samples was studied by atomic force microscopy (AFM), fractal analysis of the 3-D AFM-images and power spectral density (PSD) function. Also the content of thin films was characterized by X-ray diffraction (XRD). The thin films were prepared onto glass and p-type silicon (100) substrates by DC magnetron-sputtering method and were studied over square areas of 4.4 lm 9 4.4 lm using AFM and fractal analysis. The 3-D surface morphology revealed the fractal geometry of Cu thin films at nanometer scale, which can be quantitatively estimated by the fractal dimension D f that was determined by cube counting method, based on the linear interpolation type. The results from AFM data indicated the possible presence of superstructures on the growth process of Cu nanostructures that were in relatively good agreement with XRD data and PSD.

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“…5(i) [48,49]. The structural information obtained from XRD patterns for Cu films is summarized in Table 4.…”

Section: Resultsmentioning

confidence: 99%

Micromorphology characterization of copper thin films by AFM and fractal analysis

Arman

Ţălu

Luna

et al. 2015

J Mater Sci: Mater Electron

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“…As for metal/metal-based multilayer coatings, Ghosh et al [55] deposited [Ni (4.5 nm/Cu (2, 4, and 8 nm)] multilayer coatings on a stainless steel (AISI SS 304) substrate. The multilayer coating with the minimum Cu thickness showed the lowest COF and wear rate of ~0.4 and 1.3 × 10 −7 mm 3 /(N·mm), respectively (counterpart: 6 mm WC ceramic ball; load: 3−11 N).…”

Section: Other Materialsmentioning

confidence: 99%

Tribology of multilayer coatings for wear reduction: A review

et al. 2017

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Friction and wear phenomena encountered in mechanical systems with moving components are directly related to efficiency, reliability and life of the system. Hence, minimizing and controlling these phenomena to achieve the desired system performance is crucial. Among the numerous strategies developed for reducing friction and wear, coatings have been successfully utilized in various engineering applications to mitigate tribological problems. One of the benefits of coatings is that they may be fabricated using a variety of materials in several different forms and structures to satisfy the requirements of the operating conditions. Among many types, coatings that are comprised of a combination of materials in the form of a multilayer have been gaining much interest due to the added degree of freedom in tailoring the coating property. In this paper, the properties and development status of multilayer coating systems for tribological applications were reviewed with the aim to gain a better understanding regarding their advantages and limitations. Specifically, focus was given to Ti-based and Cr-based coatings since Ti and Cr were identified as important elements in multilayer coating applications. Emphasis was given to materials, design concepts, mechanical properties, deposition method, and friction and wear characteristics of these types of coatings.

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“…Superior mechanical properties like extreme hardness and good wear resistance have been frequently reported [1][2][3]. Thus, during recent years transition metal nitride have developed crucial roles in applications where these properties are required.…”

Section: Introductionmentioning

confidence: 99%