Dependence between friction of laser interference patterned carbon and the thin film morphology

Roch, Teja; Benke, Dimitri; Milles, Stephan; Roch, Aljoscha; Kunze, Tim; Lasagni, Andrés Fabían

doi:10.1016/j.diamond.2015.02.002

Cited by 28 publications

(19 citation statements)

References 21 publications

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“…Then the temperature at the sample surface after absorption of the pulse can be calculated by the formula T = T 0 + (1 − R ) αE /( cρ ). Here R = ( n − 1) 2 /( n + 1) 2 = 0.185 is the reflectivity of the ta‐C surface at 800 nm for n = 2.5, α is the linear absorption coefficient, E is the laser fluence, c = 0.615 J/(g K) is the heat capacity, ρ = 2.8 g cm −3 is the film density, T 0 = 293 K is the room temperature. To achieve graphitization temperature T G = 1000 K at graphitization threshold fluence of 0.26 J cm −2 , absorption coefficient should be α = 4.7 × 10 3 cm −1 .…”

Section: Surface Reliefmentioning

confidence: 99%

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Raman Spectroscopy of Amorphous Carbon Films Modified by Single‐Pulse Irradiation of Nanosecond and Femtosecond Lasers

Arutyunyan

Комленок

Zavedeev

et al. 2017

Physica Status Solidi (b)

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Structural modifications of tetrahedral amorphous carbon (ta-C) films, caused by single-pulse laser irradiation, were investigated. Graphitization of the films, content and size of sp 2 carbon clusters were analyzed by means of Raman spectroscopy. It has been shown that pulse duration, as well as laser fluence and wavelength of irradiation, strongly influence the processes of graphitization and ablation of the ta-C films. In particular, heating of the films by the laser beam leads to formation of sp 2 carbon clusters and their enlargement up to the size of several nanometers. Material transformation to graphitized fraction is much more efficient in case of ns pulse duration. In case of fs pulse duration, such factors as multiphoton absorption and evaporation of over-heated material from the surface at high laser fluence, shorter time of irradiation, and heat transfer to the inner layers of the film lead to relatively weak graphitization characterized by the maximum size of the sp 2 carbon clusters of about 1 nm.

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Section: Surface Reliefmentioning

confidence: 99%

“…Laser technique is widely used to change electrical, tribological, and nanomechanical properties of diamond‐like carbon films for their use in different applications. So the necessity arises to choose the laser source and the parameters of irradiation to achieve appropriate properties of the laser‐modified DLC films.…”

Section: Introductionmentioning

confidence: 99%

Raman Spectroscopy of Amorphous Carbon Films Modified by Single‐Pulse Irradiation of Nanosecond and Femtosecond Lasers

Arutyunyan

Комленок

Zavedeev

et al. 2017

Physica Status Solidi (b)

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“…The observed differences were attributed to an interplay between decreased hardness (higher COF) and a reduction of the effective contact area (lower COF). [21] In another study, Rosenkranz et al could show under mixed lubrication a significant increase of the oil film lifetime (i.e., the time until the COF increases significantly) by using cross-like patterns fabricated by DLIP on steel substrates. The best effects were achieved, if the structural depth of the pattern is in the range of the oil film thickness.…”

Section: Introductionmentioning

confidence: 99%

Effects of Multi‐Scale Patterning on the Run‐In Behavior of Steel–Alumina Pairings under Lubricated Conditions

et al. 2017

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In nature, many examples of multi-scale surfaces with outstanding tribological properties such as reduced friction and wear under dry friction and lubricated conditions can be found. To determine whether multi-scale surfaces positively affect the frictional and wear performance, tests are performed on a ball-on-disk tribometer under lubricated conditions using an additive-free poly-alpha-olefine oil under a contact pressure of around 1.29 GPa. For this purpose, stainless steel specimens (AISI 304) are modified by micro-coining (hemispherical structures with a structural depth of either 50 or 95 mm) and subsequently by direct laser interference patterning (cross-like pattern with 9 mm periodicity) to create a multi-scale pattern. The comparison of different sample states (polished reference, laser-patterned, micro-coined, and multi-scale) shows a clear influence of the fabrication technique. In terms of the multi-scale structures, the structural depth of the coarser micro-coining plays an important role. In case of lower coining depths (50 mm), the multi-scale specimens show an increased coefficient of friction compared to the purely micro-coined surfaces, whereas larger coining depths (95 mm) result in stable and lower friction values for the multi-scale patterns.

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“…Because of their excellent tribological properties, including low friction and high wear resistance, as well as high stability, corrosion resistance and hardness, DLC coatings are increasingly common in many industries. Like other state-of-the-art materials, they need to have good mechanical, physical, chemical and fabrication properties to ensure long service life and reliability of products [2][3][4][5][6][7][8]. In addition to the exceptional mechanical and tribological properties, the materials are characterised by low and negative electron affinity, excellent thermal conductivity and a very low coefficient of thermal expansion.…”

Section: Introductionmentioning

confidence: 99%

Determining the Tribological Properties of Diamond-Like Carbon Coatings Lubricated with Biodegradable Cutting Fluids

Ozimina

Madej

Kowalczyk

2017

Archives of Metallurgy and Materials

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The aim of the study was to determine the effectiveness of the biodegradable cutting fluid used instead of classical, usually toxic. This paper presents the results of tribological studies of a-C:H coatings formed on HS6-5-2C steel by plasma-assisted chemical vapour deposition. The coating structures were examined using a JSM-7100F SEM. The coating microhardness was measured with a Matsuzawa tester. The surface texture analysis was performed before and after the tribological tests with a Talysurf CCI Lite optical profiler. The tribological properties were investigated using a T-01 M tester and a T-17 tester. The tests were carried out under dry friction conditions and lubricated friction conditions using a lubricant with zinc aspartate. The test results show that the layer formed at the interface prevented the moving surfaces. The investigations discussed in this paper have contributed to the development of non-toxic and environmentally-friendly manufacturing because of the use of biodegradable cutting fluid and thin, hard coatings.

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Dependence between friction of laser interference patterned carbon and the thin film morphology

Cited by 28 publications

References 21 publications

Raman Spectroscopy of Amorphous Carbon Films Modified by Single‐Pulse Irradiation of Nanosecond and Femtosecond Lasers

Raman Spectroscopy of Amorphous Carbon Films Modified by Single‐Pulse Irradiation of Nanosecond and Femtosecond Lasers

Effects of Multi‐Scale Patterning on the Run‐In Behavior of Steel–Alumina Pairings under Lubricated Conditions

Determining the Tribological Properties of Diamond-Like Carbon Coatings Lubricated with Biodegradable Cutting Fluids

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