Local transformation of amorphous hydrogenated carbon coating induced by high contact pressure

Fukumasu, Newton Kiyoshi; Bernardes, Cristiane Teixeira Vilhena; Ramírez, M. A.; Trava-Airoldi, V.J.; Souza, R.M.; Machado, Izabel Fernanda

doi:10.1016/j.triboint.2018.04.006

Cited by 20 publications

(8 citation statements)

References 28 publications

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“…Among the influencing factors, normal load (contact pressure), sliding velocity, temperature, and the surrounding atmosphere are playing pivotal roles in affecting the tribological performance [10]. Evidence has been collected to confirm that sp 2 -rich (FLC and GLC) [5,11] or hydrogenated DLC [12] could withstand very high contact pressure (up to 1.24 GPa) by reconstructing the interfacial sp 2 -layered structures into graphene or the formation of graphitic shells or by the stress-triggered local transformation. Liu et al [13] investigated the velocity dependence of superlubricity stability in a wide range of 3−70 cm•s -1 and found that the failure of superlubricity at high sliding velocity was due to the absence of tribolayer on contact surface rather than the flashing heat effect or the destruction of hydrogen passivation.…”

Section: Solid Superlubricity 2211 Superlubricity Of Diamond-like mentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

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Section: Solid Superlubricity 2211 Superlubricity Of Diamond-like mentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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“…Two-dimensional (2D) finite element modeling of the orthogonal cut of the metal matrix composites was conducted using the TRIBOCode digital tribology platform developed at the Surface Phenomena Laboratory (LFS-USP) [29,30]. The FEM model considered both homogeneous and heterogeneous microstructures, to evaluate the influence of the sulfides during machining.…”

Section: Fem-finite-element Modelingmentioning

confidence: 99%

Orthogonal cut of SPS-sintered composites with ferrous matrix and Fe Mo S particles: Numerical and experimental analysis

Souza

Ordoñez

Mezghani

et al. 2020

Tribology International

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Metal-matrix composites with solid lubricant reinforcements may present a suitable alternative to improve the tribological behavior of sintered components. Besides the performance during the application, the presence of solid lubricants may also modify component manufacture, for example, during machining operations to achieve complex shapes not directly obtained from the sintering process. This work describes a numerical and experimental analysis on the orthogonal cut of metal-matrix composites composed of FeeMoeS particles embedded in an Astaloy 85 Mo (Höganäes AB) matrix. Specimens were prepared using the Spark-Plasma Sintering (SPS) technique, from mixtures containing powders of Astaloy 85 Mo steel and 2 wt% or 4 wt% of molybdenum disulfide (MoS 2). An unreinforced Astaloy 85 Mo specimen (without MoS 2) was also included in the analysis. Different microstructures were observed after SPS. The unreinforced specimen presented a ferrite-pearlite structure with a porosity level below 2% and the specimen sintered with 2 wt% of MoS 2 presented iron sulfide particles dispersed in the steel matrix. The structure of the specimen sintered with 4 wt % was more complex, with two distinct phases dispersed in the Astaloy 85 Mo matrix. Experimental orthogonal cuts were conducted on the three specimens using a shaper machine tool equipped with a tungsten carbide (WCeCo) cutting insert. Tests were recorded using a high-speed camera. The machined surfaces were later analyzed with an optical profilometer and in a scanning electron microscope (SEM) with energy-dispersive X-ray spectroscopy (EDS). The chips were also characterized. The cutting operation was simulated by two-dimensional (2D) finite-element analysis. The meshes were prepared based on the specimen microstructures and considering the properties of the individual phases. Results have indicated significant differences in the cutting process. Observation of the chip surfaces indicates plastic deformation on the unreinforced specimen, in opposition to more uniform scratches on the composite surfaces, especially that of the specimen sintered with 4 wt % of MoS 2 .

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“…respectively [17,45]. The G peak the D can be fitted [20,29,30]. The G peak is due to all sp 2 C sites, and the D peak is only due to six-fold ring sp 2 C sites [11].…”

Section: Chemical Bondingmentioning

confidence: 99%

“…From the thermodynamical viewpoint, high pressures and/or temperatures benefit sp 3 C stabilization. Theoretical simulations and experimental studies showed a high contact pressure induced sp 2 C → sp 3 C transformation in carbon-based materials [27][28][29][30][31]. When impinged by a C + with a chosen kinetic energy, a low substrate temperature enhances the intrinsic stress of the local sites to stabilize the sp 3 C phase [32].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of sp3 C Fraction in Diamond-like Carbon Coatings by Cryogenic Treatment

et al. 2021

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Diamond-like carbon (DLC) coatings deposited onto high-speed-steel surfaces were subjected to deep cryogenic treatment (DCT) at temperatures of −120 to −196 °C to investigate the evolution of microstructure, bonding structure, and mechanical properties. The surface morphology and the bonding structure of the DLC coatings were studied using scanning electron microscopy, transmission electron microscopy, micro-Raman spectroscopy, and X-ray photoelectron spectroscopy. It is found that DCT affects the surface morphology, especially the size and the height of the aggregates. For those DLCs with more than 50% sp3 C fraction, the sp2 C → sp3 C transformation occurred in coatings treated at a temperature of −120 to −160 °C; and the maximum fraction of sp3 C was obtained after treatment at −140 °C. Almost keeping the wear resistance of DLCs, DCT can improve the adhesion strength, and surface hardness. The findings of this study indicate that DCT will be a potential post-treatment method to tune the microstructure and mechanical performance of DLC coatings.

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Local transformation of amorphous hydrogenated carbon coating induced by high contact pressure

Cited by 20 publications

References 28 publications

A review of recent advances in tribology

A review of recent advances in tribology

Orthogonal cut of SPS-sintered composites with ferrous matrix and Fe Mo S particles: Numerical and experimental analysis

Enhancement of sp3 C Fraction in Diamond-like Carbon Coatings by Cryogenic Treatment

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