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Literatura académica sobre el tema "Tribological coatings"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 2 de febrero de 2022

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Artículos de revistas sobre el tema "Tribological coatings"

Schrader, Tobias, Ulf Engel y Marion Merklein. "Tribological Characterization of PVD-Coatings". Key Engineering Materials 438 (mayo de 2010): 179–86. http://dx.doi.org/10.4028/www.scientific.net/kem.438.179.

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In cold forging processes the high tribological and mechanical loads often lead to early tool failure. If the cause of failure is wear, an extension of tool life could be achieved by the application of PVD coatings. In industrial tools there is a great variety of load cases that causes wear. Therefore a lot of coatings with different properties are necessary, which need to be adjusted to the various applications. In order to adapt the coatings appropriately to the different processes, a sufficient characterization of the coatings is required. In this paper three new types of PVD coatings based on TiC, AlCrN and TiAlN and two reference PVD coatings based on TiN and TiAlCN are investigated. Since friction plays an important role for the tribological conditions between workpiece and tool, the friction factor m of the coatings is determined for different lubricants in the so called Double Cup Extrusion (DCE) test. A major influence of the lubricants and a minor influence of the coatings can be seen in the conducted tests. Furthermore wear behavior of the coatings is investigated with a so called combined Punching-Forward Extrusion (CPFE) test. In this test it is possible to test simultaneously coated dies and punches under realistic conditions. For the new coating (TiAlN), characterized by monolayer structure, there is wear debris visible in some regions of the die shoulder. The early occurrence of wear might be caused by the ductility of the coating or adherence problems. The other new coatings (TiC and AlCrN), which have a multilayer structure, are revealing excellent wear behavior. The high wear resistance of these two coatings can be explained with their high hardness in combination with a special layer composition.

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Madej, Monika. "Tribological Properties of Diamond-Like Carbon Coatings". Advanced Materials Research 874 (enero de 2014): 9–15. http://dx.doi.org/10.4028/www.scientific.net/amr.874.9.

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The aim of the study was to analyze the superhard anti-wear diamond-like carbon coatings produced by Plasma Assisted Chemical Vapor Deposition (PACVD) and Physical Vapour Deposition (PVD). The a-C:H and a-C:H:W coatings were deposited on steel elements operating under friction conditions. The analysis involved comparing the tribological properties of coated metal elements with those of uncoated elements. It was essential to analyze how the coating composition and structure influence the tribological behaviour of elements under dry and lubrication friction conditions. The coating structure was analyzed by observing the topography of the surface and the cross-sections using an atomic force microscope (AFM) and a scanning electron microscope (SEM). The results were employed to determine the elemental composition and thickness of the coatings. The tribological tests were performed applying a ball-on-disc tribometer and using a pin-on-plate tribometer. The tribological properties were analyzed also in a micro scale using a microtribometer. Compared with the substrate material - steel, the diamond-like carbon coatings showed lower linear wear, lower friction coefficient and higher hardness.

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Shi, Bai Jun, Yuan Ping Peng, Si Chi Wu y Hang Li. "Research on Microstructure and Tribological Properties of Cr-Based Hard Coatings". Advanced Materials Research 811 (septiembre de 2013): 126–30. http://dx.doi.org/10.4028/www.scientific.net/amr.811.126.

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In this paper, three kinds of Cr-based hard coatings have been studied for its structural, mechanical and tribological properties at room temperature. By the technology of closed field unbalanced magnetron sputter ion plating (CFUMSIP), CrN CrAlN and CrTiAlN hard coatings were deposited onto DC53 cold die steel and silicon (100) substrate. The coatings were characterized by means of field emission scanning electron microscopy (FESEM), X-ray diffractometer (XRD), microhardness tester, optical microscope and ball-on-disc tribometer, in order to check their structural, as well as to determine the mechanical and tribological properties. The experimental results showed that the CrTiAlN coating performed better than the CrN coating and the CrAlN coating in terms of mechanical and tribological properties. The wear resistances of CrN, CrAlN and CrTiAlN coatings have been significantly improved compared with DC53 steel substrate.

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Gadhari, Prasanna y Prasanta Sahoo. "Electroless Nickel-Phosphorus Composite Coatings". International Journal of Manufacturing, Materials, and Mechanical Engineering 6, n.º 1 (enero de 2016): 14–50. http://dx.doi.org/10.4018/ijmmme.2016010102.

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Electroless nickel composite coatings possess excellent mechanical and tribological properties such as, hardness, wear and corrosion resistance. Composite coatings can easily be coated not only on electrically conductive materials but also on non-conductive materials like as fabrics, plastics, rubber, etc. This review emphasizes on the development of electroless nickel composite coatings by incorporating different types of hard/soft particles (micro/nano size) in the electroless Ni-P matrix to improve the mechanical and tribological properties of the coatings. The preparation of electroless bath for nickel-phosphorus composite coating, methods to incorporate hard and/or soft particles in the bath, factors affecting the particle incorporation in the coating and its effect on coating structure, hardness, wear resistance, friction behavior, corrosion resistance, and mechanical properties are discussed thoroughly.

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Zhang, Ya Gang, Wan Chang Sun, Min Ma, Sha Sha Tian, Yu Wan Liu, Yan Xiao y Rui Kai Xia. "Tribological Behavior of Co-WC Composite Coatings". Materials Science Forum 996 (junio de 2020): 173–78. http://dx.doi.org/10.4028/www.scientific.net/msf.996.173.

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A novel Co-WC composite coating was deposited on the surface of high speed steel (HSS) substrate by an energy-efficient method of electrodeposition. The effects of process parameters on friction and wear properties of the composite coatings were evaluated, and the worn morphologies of Co-WC composite coatings were investigated by scanning electron microscopy. Results revealed that the incorporation of WC particles can significantly improve the wear resistance of the coating. As the current density was increased to 6.5Adm-2 and the WC concentration was increased to 35g/L, the Co-WC composite coating had the lowest friction coefficient and wear loss.

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Geng, Zhe, Huadong Huang, Baoshan Lu, Shaohua Wu y Gaolian Shi. "Tribological behaviour of low-pressure plasma sprayed WC-Co coatings at elevated temperatures". Industrial Lubrication and Tribology 71, n.º 2 (11 de marzo de 2019): 258–66. http://dx.doi.org/10.1108/ilt-05-2018-0194.

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Purpose This paper aims to investigate the effect of coating microstructure, mechanical and oxidation property on the tribological behaviour of low-pressure plasma spraying (LPPS) tungsten carbide/cobalt (WC-Co) coatings. Design/methodology/approach WC-12Co and WC-17Co coatings were deposited via the LPPS spraying method. Tribological tests on the coatings were performed using a high-temperature ball-on-disc tribometer at temperatures from room temperature (RT, approximately 25 °C) up to 800 °C in ambient air. Findings WC-12Co coating contained brittle phases, pores and microcracks, which led to the low hardness, and finally promoted the splat delamination and the carbide debonding during wear. WC-17Co coating had higher cobalt content which benefited the coating to contain more WC particles, less brittle phases, pores and nearly no microcracks, and resulted in the high hardness and better wear resistance. Higher cobalt content also decelerated the oxidation rate of the coating and promoted the formation of cobalt oxides and CoWO4, which were able to maintain the load-bearing capacity and improve the tribological behaviour of the coating below 650°C. Above 650°C, the increase of oxidation degree and the decrease of mechanical property deteriorated the wear resistance of coatings. Originality/value The LPPS WC-Co coating with higher cobalt content had better tribological properties at different temperatures. The LPPS WC-Co coatings should not be used as wear-resistant coatings above 650 °C.

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Bartuli, C., T. Valente, F. Casadei y M. Tului. "Advanced thermal spray coatings for tribological applications". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 221, n.º 3 (1 de julio de 2007): 175–85. http://dx.doi.org/10.1243/14644207jmda135.

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Thermal spray coating is one of the most common procedures to improve the tribological properties of materials. Ceramic and cermet coatings, especially those based on oxides (alumina, chromium oxide, etc.) and carbides, are widely used for wear protection. Improvements under investigations are related to the possible use of nanostructured coatings and to the potential application of hybrid techniques. As a possible alternative, solid lubrication is proposed as integration or replacement of the traditional liquid lubrication in the case of severe operative conditions when there is the possibility of a lack of lubricant or when environmental problems can arise from waste disposal. In the present paper, results from experimental activities on different types of abrasion-resistant thermal spray coatings are presented: graded coating systems, specifically designed for titanium-based alloys, obtained by reactive plasma spraying and physical vapour deposition of titanium nitrides; nanostructured WC-Co coatings deposited by high velocity oxy-fuel; plasma-sprayed ceramic coatings based on oxides containing nanophases either from nanostructured precursors or postprecipitated by purposely designed thermal treatments; self-lubricant coatings deposited by plasma spray with the inclusion of graphite.

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Constantin, Lidia R., Anca C. Parau, Mihai Balaceanu, Mihaela Dinu y Alina Vladescu. "Corrosion and tribological behaviour in a 3.5% NaCl solution of vacuum arc deposited ZrCN and Zr–Cr–Si–C–N coatings". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, n.º 1 (27 de abril de 2018): 158–69. http://dx.doi.org/10.1177/1350650118774132.

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ZrCN and Zr–Cr–Si–C–N coatings were deposited on Si (100) and 316L stainless steel substrates using the cathodic vacuum arc technique in a mixed atmosphere of C2H2 and N2. The coatings were grown keeping almost constant the ratio of the C2H2 and N2 mass flow rates, substrate bias and deposition temperature at ∼0.81, −200 V and 320 ℃, respectively. The investigation carried out aimed to determine the corrosion and tribological performance of the novel Zr–Cr–Si–C–N coating obtained by Cr and Si addition to the ZrCN reference coating. The films were characterized in terms of elemental and phase composition, crystalline structure, hardness, reduced elastic modulus and adhesion. Particular attention was devoted to the investigation of coatings' corrosion resistance and tribological performance carried out in a 3.5% NaCl solution. Cr and Si addition to ZrCN coating leads to reduction in film crystallinity, finer microstructure, enhanced corrosion resistance and better tribological performance under corrosive testing conditions. In this paper, we discuss the measured mechanical and tribological properties of the two coatings in terms of various ratios of hardness and reduced elastic modulus. The coated samples exhibited high corrosion protection efficiency, reaching 97.8% for the Zr–Cr–Si–C–N coating. Both coatings improved the tribological performance of 316L steel in the saline solution. Specifically, the addition of Cr and Si into ZrCN coating results in a decrease of the wear rate of about 60%.

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Kang, S. S., J. M. Dubois y J. von Stebut. "Tribological properties of quasicrystalline coatings". Journal of Materials Research 8, n.º 10 (octubre de 1993): 2471–81. http://dx.doi.org/10.1557/jmr.1993.2471.

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Coatings of three different compositions (Al65Cu20Fe15, Al64Cu18Fe8Cr8, and Al67Cu9Fe10.5Cr10.5Si3) were realized by various thermal deposition techniques. They were studied in the as-deposited state and after annealing. In view of potential applications, these quasicrystalline coatings were examined from the point of view of tribology: friction and wear. Some basic components of friction such as roughness, plowing, and adhesion have been studied in scratch testing. The friction resistance of the coating is strongly dependent on its inherent porosity, hardness, and thickness. The damage of the coatings is essentially brittle though some ductile behavior is observed. Static indentation hardness is in the range 500–600 HV0.03 (5–6 GPa), whereas the scratch hardness varies from 1.4 to 2.4 GPa depending on the percentage of porosity. Friction coefficients (measured at constant load of 20 N) were found to be typically 0.07 and 0.20 for diamond (tip radius R = 0.79 mm) and AISI 52100 (radius R = 0.79 mm) indenters, respectively.

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Mateen, A., Fazal Ahmad Khalid, T. I. Khan y G. C. Saha. "Wear Behaviour of HVOF Sprayed WC-Cobalt Coatings". Advanced Materials Research 326 (septiembre de 2011): 144–50. http://dx.doi.org/10.4028/www.scientific.net/amr.326.144.

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Tungsten carbide cobalt coating has been extensively used for cutting and mining tools, aerospace, automotive and other wear resistance applications. These coatings not only have superior mechanical properties like high hardness, toughness and compressive strength but have also excellent controllable tribological properties. In this paper a comparison of wear properties and structural phases has been presented to consider for tribological applications. It is found that nanocrystalline duplex coatings have shown much superior properties as compared to the microcrystalline coatings. Evidence of clusters of WC particles was found in microcrystalline coating as compared to homogeneous dense coating structure observed in the nanocrystalline coating. These results are discussed to assess their suitability for super hard wear resistance applications.

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Tesis sobre el tema "Tribological coatings"

Karlsson, Patrik. "Tribological characterization of selected hard coatings". Thesis, Karlstad University, Faculty of Technology and Science, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-4219.

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Hard coatings are often used for protection of tool surfaces due to coating properties like low friction and high wear resistance. Even though many of the hard coatings have been tested for wear, it is important to try new wear test setups to fully understand tribological mechanisms and the potential of hard coatings. Few experiments have been performed with dual-coated systems where the sliding contact surfaces are coated with the same, or different, hard coating. The dual-coated system could be the solution to many new technical devices and perhaps a further improvement of conventional coated systems.

In this thesis, the wear tests of dual-coated systems were performed in dry reciprocating sliding mode at room temperature. This, quite off the ordinary, wear test setup was performed to study selected hard coatings and set focus on wear mechanisms in forthcoming future surface coating application areas like MEMS and orthopedic implants.

Wear tests of four different PVD hard coatings, CrN, TiAlN, WC/C and diamond-like coating (DLC) were performed in a slider-on-flat-surface (SOFS) tribo-tester with reciprocation sliding mode at room temperature and dry sliding with TiAlN coated counter body. Wear mechanisms and the amount of wear were estimated, by investigation of the wear scars produced in SOFS, by means of scanning electron microscopy (SEM), atomic force microscopy (AFM) and optical profilometer (OP).

Typical wear mechanisms found for coated surfaces in reciprocation sliding contact were crack formation, surface flattening for shorter sliding distance, elongation of surface defects, debris and thin film formation. Two types of film formation were found: tribo-oxidation film and formation of a self-lubrication film. The tribo-oxidation was the most evident for CrN and the formation of a self-lubrication film was revealed for DLC, where smearing of asperities were the initiation of the process. The DLC coatings showed lowest friction coefficient and worn volume of all the selected hard coatings.

Adhesion measurements were performed for all coatings by AFM. Both the unworn and worn surface of each coating were investigated and two coatings, DLC and TiAlN, showed low adhesion forces, which indicated promising properties for small scale devices like MEMS and NEMS with coated, non-sticking, surfaces.

Grundutbildningsprogram: Civilingenjör Bred IngångInriktning: Civilingenjör Maskinteknik och Materialteknik

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Baxi, Juhi Bhaskar. "Tribological characterization of coatings and nanofluids". [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2997.

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Luo, Dabing. "Selection of coatings for tribological applications". Ecully, Ecole centrale de Lyon, 2009. http://www.theses.fr/2009ECDL0017.

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Coatings are often used to reduce friction and protect the substrate surface from wear. However, selecting the appropriate coating from numerous ones for a given tribological application is still complicated because the tribological response of a coating system depends on many factors. The objectives of the thesis are to develop a coating pre-selection tool, and to propose some approaches to evaluate and compare coatings, sequentially to help the coating selection. Based on the study of literature and three different tribological cases, a pre-selection tool is developed by comprehensively considering the requirements and limits of applications and the characteristics of coatings. Two kinds of experiments are carried out to understand the relationships between tribological behaviors and running conditions and coating properties. Pressure sprayed MoS2 coating is investigated under three contact configurations to identify the effect of test conditions on its tribological performance. The coating lifetime can be predicted by relevant dissipated energy master curves. 5 bonded solid lubricant coatings are studied by simple evaluation techniques and fretting tests. The tribological performances of the coatings are closely related to their properties, and the simple evaluation techniques can be used to screen out the poor coatings. The tribological performances of the coatings are evaluated by comparing their dissipated energy – coating lifetime master curves. The best coating can be selected by synthetically comparing the coatings from various aspects in a polar diagram
Les revêtements sont souvent utilisés pour réduire le frottement et protéger les surfaces contre l’usure. Cependant, choisir le revêtement approprié pour une application tribologique donnée est toujours compliqué pare que la réponse tribologique d’un système revêtu dépend de beaucoup trop de facteurs. Les objectifs de cette thèse sont de développer un outil de pré-sélection de revêtements, et de proposer quelques approches permettant d’évaluer et de comparer des revêtements. Basé sur l’étude de la littérature et sur trois études de cas tribologiques, un outil de pré-sélection est développé, en considérant tous les aspects des exigences requises et des limites d’application et caractéristiques des revêtements. Deux études expérimentales sont ensuite effectuées. Un revêtement de MoS2 pulvérisé sous pression est examiné dans trois différentes configurations d’essai pour identifier l’effet des conditions d’essai sur sa performance tribologique. La durée de vie de ce revêtement peut être prévue par les courbes maîtresses basées sur l’énergie dissipée. Cinq revêtements de type vernis de glissement sont également étudiés par des techniques simples d’évaluation et par des essais de fretting. Les performances tribologiques de revêtements dépendent de leur propriétés, et les techniques simples dévaluation peuvent être utilisées pour éliminer de mauvais revêtements, lors du processus de choix. Les performances tribologiques des revêtements sont évaluées en comparant les courbes maîtresses reliant durée de vie et énergie dissipée. Le meilleur revêtement peut alors être choisi, en comparant synthétiquement les revêtements selon divers aspects dans un diagramme polaire

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Simonson, William Jeffrey. "Tribological Properties of Mo2N-based Adaptive Coatings". OpenSIUC, 2009. https://opensiuc.lib.siu.edu/theses/15.

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Adaptive coatings are an important development in tribology. These coatings widen the range at which solid lubricants are useful in various environments. In this paper, coatings founded on molybdenum nitride are studied, with a focus on thermal cycling. These coatings were fabricated by unbalanced magnetron sputtering and characterized with techniques including x-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, energy dispersive x-ray spectroscopy (EDS), and pin-on-disk tribometer. The results of two sets of coatings are reported. The first set of coatings is a nanocomposite of Mo2N/MoS2/Me (Me = Ag, Au, Cu). The second is a complex multi-layer system of Mo2N/Ag and a diffusion barrier of TiN which has been etched, then filled and coated with a layer of MoS2. After heating, these compounds produced silver molybdates. The Mo2N/MoS2/Ag nanocomposite shows promise with a 0.02 coefficient of friction at room temperature, while the multi-layer system eventually equilibrated at approximately 0.6. At high temperatures, again the nanocomposite was better, producing a 0.25 frictional coefficient compared to a 0.3 from the multilayer system. These results provide insight into what is needed to achieve thermal cycling.

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Ahmed, Omer. "Tribological and Mechanical properties of Multilayered Coatings". University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1501763970144729.

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Mallia, Bertram. "Novel Nanostructured Coatings for Extreme Tribological Environments". Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491642.

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The degradation of material surfaces is a 'valve' that has limited technological progress through the ages. Today's most challenging environments are those where component surfaces are exposed to the simultaneous or sequential actions of corrosion and mechanical wear. These phenomena can be mitigated by a better understanding of the interactions between the multiple degradation mechanisms and the systematic development of alternative material surfaces. In this work, PVD coatings based on the Fe-Cr-Ni, Cr-Ti, Cr-B-(N) and W-(B) material systems were developed using unbalanced magnetron sputtering and mainly applied to AISI 316L, Ti-6AI-4V and Ortron 90 substrates respectively. For Fe-Cr-Ni and Cr-Ti coatings, post deposition heat treatments were conducted to stimulate the formation of the cr-FeCrNi and Laves Cr2Ti intermetallic phases respectively. In all cases, the morphology, chemical composition, structure, mechanical properties, corrosion behaviour and damage tolerance of the various coated materials were investigated. Special emphasis was placed on the response of the coated materials and uncoated test-pieces to the simultaneous action of corrosion and mechanical wear that resulted from sliding an Ah03 ball against the coated and uncoated materials in a 0.9 wt%NaCI solution. For one case only, W-(B) coated AISI 52100, lubricated rolling/sliding contact durability was assessed. For the corrosion-wear tests, the removal and regeneration of the passive layer (type I corrosion-wear) dominated the material loss. A high coatings hardness for'Fe-Cr-Ni and CrTi coatings was often beneficial to reduce the mechanical wear but the corrosion due to wear frequently remained high. Partial post deposition oxidation of Fe-Cr-Ni coatings was very effective in reducing the latter. Also of importance was the roughening of the Ah03 counterface due to the formation of tribo/transfer films or grain pull out. The material loss for Cr-B-(N) coatings was dominated by a material transfer mechanism and Ah03 grain pull out resulted in high mechanical wear of amorphous Cr-Ti coating. W-(B) coatings generally had low material loss and their crystalline variants displayed a low p.. The latter became inappropriate for conditions which promote high W dissolution. In lubricated rolling/sliding tests W-(B) coated AISI 52100 performance wasÃ‚Â·dependent on coating crystal structure and boron supersaturation. The crystalline coatings with low boron supersaturation displayed the best rolling/sliding damage resistance.

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Renman, Viktor. "Tribological testing of DLC coatings for automotive applications". Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-177355.

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In this work, the friction and wear behavior of three DLC coatings was evaluated in various conventional and alternative fuels as well as in commercially available formulated engine oils and additive-free synthetic oil. The first DLC has a thin top-coating of hydrogenated amorphous carbon (a-C:H), the second consists of Si-doped DLC (a-C:H:Si) and the third is a W-doped multilayered structure of a-C:H and a-C:H:W. The tribological tests were performed using a ball-on-flat reciprocating rig at low contact pressures. Methods such as white light interferometry (VSI), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS), Raman spectroscopy, transmission electron spectroscopy (TEM) and electron spectroscopy for chemical analysis (ESCA/XPS) were used for analyzing and characterizing the coatings and counter surfaces in an effort to gain an understanding of the tribological mechanisms involved.

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Stoyanov, Pantcho. "Micro-tribological performance of metal-doped MoS2 coatings". Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103709.

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The mechanical and tribological properties of pure MoS2, pure Au, Au-MoS2 and Ti-MoS2 coatings were evaluated and examined at a microscopic scale. The metal doped MoS2 coatings had varying metal content, 5-10at% for Ti and 10-90% for Au. Reciprocating sliding wear tests were performed with a range of initial Hertzian contact pressures from 0.41 to 3.5 GPa and in air at two humidity levels (i.e. "low" being 3-5%RH and "high" being 30-40%RH). Titanium and gold were chosen for this study as metal additives due to their positive influence on the mechanical properties of the coating. The friction and wear behavior at the micro-scale were directly compared to tribological properties at the macro-scale, which were performed using an in situ tribometer. Reciprocating micro- and macro- wear tests were performed with spherical diamond tip (with 10 and 50 µm radii) and a sapphire tip (with a radius of 3.175 mm), respectively. The range of initial Hertzian contact pressures for macro-scale (i.e. between 0.41GPa and 1.2GPa) overlapped with that for micro-scale. However, the initial Hertzian contact diameters (2*a) were very different (i.e. 0.8-2.3 µm for micro-scale and 60-180 µm for macro-scale). It was observed that the small addition of Ti or Au to MoS2 improved the microtribological properties (i.e. lower friction and less wear) compared to pure MoS2 coatings. The improved microtribological properties with metal additions were attributed to an increase in the mechanical properties, decrease in adhesion, and a decrease in the interfacial shear strength. In terms of the different length scales, lower steady state friction was observed for macrotribology compared to microtribology. The higher friction at the micro-scale was explained by the greater adhesion effects and additional velocity accommodation modes (e.g. microplowing or plowing). The microplowing or plowing at the microscopic scale was attributed to the tip roughness and the inability to sustain a stable transfer film throughout the tests at high humidity. In addition, using in situ and ex situ techniques, three different stages for solid lubrication were identified based on differences in contact area, tip shapes, and environmental conditions. The first stage has been previously observed with macrotribology on MoS2 coatings at low humidity levels. The second stage, on the other hand, was observed for micro-tribology where the contact size is significantly smaller compared to stage one. The main wear mechanism is still adhesion, but there is also some micro-plowing. The final stage was observed for humid sliding in microtribology, where no transfer films were observed and therefore the main wear mechanism was plowing.
Les propriétés mécaniques et tribologiques de revêtements de MoS2 pur, d'Au pur, de Au-MoS2 et de Ti-MoS2 ont été évaluées et examinées à l'échelle microscopique. Les revêtements nanocomposites étudiés contenaient 5-10 % at. de Ti et 10-90 % at. d'Au. Des tests d'usure par glissement alternatif ont été mis en œuvre, l'échelle de pression Hertzienne de contact initiale variant de 0.41 à 3.5 GPa, dans une atmosphère d'air avec deux niveaux d'humidité contrôlée (le niveau le moins élevé se situant entre 3 et 5 % HR et le plus élevé entre 30 et 40 % HR). Pour cette étude, le titane et l'or ont été choisis comme additifs métalliques pour leur influence positive sur les propriétés mécaniques des revêtements. Les comportements de friction et d'usure des revêtements à l'échelle microscopique ont été directement comparés à leurs propriétés tribologiques à l'échelle macroscopique, dont les tests étaient effectués à l'aide d'un tribomètre in situ. Des tests sclérométriques alternatifs ont été réalisés aux échelles microscopiques et macroscopiques avec des pointes de diamant sphérique (10 et 50 µm de rayon) et une pointe de saphir (ayant un rayon de 3.175 mm). La gamme de pression Hertzienne de contact utilisée à l'échelle microscopique (entre 0.41 GPa et 1.2 GPa) était très proche de celle utilisée à l'échelle macroscopique. Cependant, le diamètre de contact Hertzien initial (2*a) était très différent, soit 0.8 – 2.3 µm à l'échelle microscopique et 60 – 180 µm à l'échelle macroscopique. Les résultats montrent que l'ajout de faibles quantités de Ti ou d'Au au MoS2 améliore les propriétés micro-tribologiques (comportements à la friction et à l'usure atténués) en comparaison avec des revêtements de MoS2 pur. L'amélioration des propriétés micro-tribologiques due à l'addition de métaux a été attribuée au renforcement des propriétés mécaniques, une adhésion plus faible et une baisse des contraintes de cisaillement interfaciales. Si l'on compare des tests micro- et macro-tribologiques effectués sur des étendues de longueur variées, ces derniers étaient caractérisés par une friction en régime permanent moins élevée. Le comportement de friction plus accentué dans le cas des tests réalisés à l'échelle microscopique s'explique sur la base d'effets d'adhésion plus importants et des modes additionnels de compensation de vitesse (labourage ou micro-labourage). Les tendances au labourage ou micro-labourage observées à l'échelle microscopique ont été attribuées à la rugosité de la pointe de diamant et à la difficulté de maintenir une couche de film de transfert en place lors de tests effectués dans des conditions d'humidité élevée. L'utilisation de techniques in situ et ex situ a également permis de déterminer trois stades de lubrification solide, en se basant sur des différences observées à la zone de contact, dues aux formes des différentes pointes et aux conditions environnementales appliquées. Le premier stade, avait été identifié auparavant, lors de tests de macro-tribologie sur des revêtements de MoS2, à un niveau d'humidité faible. Par contre, le deuxième stade n'a été observé que lors de tests de micro-tribologie où la taille de la zone de contact était bien plus petite que dans le cas du premier stade. A ce stade, le mécanisme d'usure est principalement relié au comportement d'adhésion du revêtement, avec une influence possible de l'effet de micro-labourage. Le stade final de lubrification a été observé lors de tests de micro-tribologie réalisés dans des conditions d'humidité élevée et caractérisés par l'absence du film de transfert. De cette observation, il a été déduit que le principal mécanisme d'usure du film à ce stade de lubrification correspondait au labourage.

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Simonson, W. Jeffrey. "Tribological properties of Mo₂N-based adaptive coatings /". Available to subscribers only, 2009. http://proquest.umi.com/pqdweb?did=1879993791&sid=2&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Roy, Amit. "Tribological Performance of Polymer Based Self-lubricating Coatings". Thesis, Luleå tekniska universitet, Maskinelement, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-75576.

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The thesis comprises the two parts in each chapter: the first part focuses on the development and characterization of polyimide (PI) based composite coatings on a steel substrate. In order to improve the tribological performance of polyimide coatings, the fillers i.e. multi-walled carbon nanotubes (MWCNTs) and Graphene (GP) were added into PI and conducted friction test at elevated temperatures ranging from room temperature (RT) to 200°C. Also, the influence of fillers (MWCNTs and GP) materials into PI coatings surface, mechanical and tribological properties of polyimide composites coatings are measured. The addition of MWCNTs and GP reduces the friction coefficient as well as wear volume at elevated temperatures 50°C, 100°C and sometimes at 150°C. These temperatures play a vital role to form a lubrication layer in the contact interfaces at certain load and operating conditions. In these cases, three weight percentage (3wt%) of MWCNTs and GP into polyimide composites showed low friction and high wear-resistant as compared to other PI composites. Besides, by adding these two fillers into pure PI improved the mechanical properties such as micro-hardness and nanoindentation. The scanning electron microscope (SEM) was used to observe the wear mechanism of the composite coatings worn surfaces. The consequences expose that the fatigue wear mechanisms were predominant in the worn surfaces. Moreover, the thermal study of the polyimide composite coatings was conducted using thermal gravimetric (TG) to analyze the behavior of composite coatings at high temperatures. The results showed that the PI coatings with MWCNTs and GP have high thermal stability at 60% sample residue. In the second part-an epoxy coatings with filler materials e.g. hexagonal boron nitride (h-BN) and expanded graphite (EG) were made and conducted their tribological i.e. friction coefficient and wear performance. Also the perfect mixing ratio 4:1 (80 wt% base epoxy matrix and 20 wt% curing agent) was determined on the basis of stoichiometric ratio to cure the epoxy accurately. Therefore, seven samples with a various weight percentage (wt%) were prepared i.e. pure epoxy, epoxy with 5wt%, 10wt%, 15wt% of h-BN and EG. All the prepared samples ran at two different loading 2 N and 4 N conditions with 5 Hz frequency, 300 rpm and 30 minutes duration. The epoxy with h-BN showed low friction as compared to EG where EG has better wear-resistant behavior than h-BN.

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Libros sobre el tema "Tribological coatings"

Ma, Kungjeng. Design and characterisation of tribological coatings. Birmingham: University of Birmingham, 1997.

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Davim, J. Paulo y Manish Roy. Thermal sprayed coatings and their tribological performances. Hershey, PA: Engineering Science Reference, 2015.

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Abdul-Mahdi, Fadhil S. Tribological characteristics of coatings on aluminium and its alloys. Uxbridge: Brunel University, 1987.

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Ronkainen, Helena. Tribological properties of hydrogenated and hydrogen-free diamond-like carbon coatings. Espoo [Finland]: Technical Research Centre of Finland, 2001.

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Intzevidis, Ioannis. The effects of silicone oil additions on the tribological properties of polymer coatings. Salford: University of Salford, 1985.

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International Meeting on Modern Ceramics Technologies (12th 2010 Montecatini Terme, Italy). Ceramic thin films and coatings for protective, tribological and multifunctional applications: 12th international ceramics congress, part E. Stafa-Zuerich: Trans Tech Pubs.,on behalf of Techna Group, Faenza, Italy, 2011.

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Symposium K on Coating and Surface Modifications ro Furface Protection and Tribological Applications (1997 Strasbourg, France). Coatings and surface modifications for surface protection and triboligical applications: Proceedings of Symposium K on Coatings and Surface Modifications for Surface Protection and Tribological Applications of the 1997 ICAM/E-MRS Spring Conference, Strasbourg, France, June 16-20, 1997. Amsterdam: Elsevier, 1997.

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DellaCorte, Christopher. Effects of atmosphere on the tribological properties of a chromium carbide based coating for use to 760 C̊. [Washington, DC: National Aeronautics and Space Administration, 1987.

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Coatings and Surface Modifications for Surface Protection and Tribological Applications (European Materials Research Society Symposia Proceedings). Elsevier Science, 1998.

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Budinski, Kenneth G. y Steven T. Budinski. Tribomaterials. ASM International, 2021. http://dx.doi.org/10.31399/asm.tb.tpsfwea.9781627083232.

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Tribomaterials: Properties and Selection for Friction, Wear, and Erosion Applications provides practical information on the tribological behaviors of engineering materials, how they are measured, and how to account for them in order to optimize product lifetime and performance. The first few chapters describe the mechanisms and manifestations of various types of friction, erosion, and wear and how to assess their impact on design and equipment operation using proven tribotesting methods. The chapters that follow cover the tribological properties and characteristics of important engineering materials, including carbon and low-alloy steels, tool steels, stainless steels, nickel- and cobalt-base alloys, copper alloys, and cast iron as well as ceramics, cermets, cemented carbides, polymers, and polymer composites. The book also includes chapters on treatments and coatings, lubrication, and the selection and screening of materials for tribosystems, including medical applications. Each chapter ends with a review of terms, takeaway concepts, essential questions, and related reading. For information on the print version, ISBN: 978-1-62708-321-8, follow this link.

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Capítulos de libros sobre el tema "Tribological coatings"

Satyanarayana, Nalam, Myo Minn, Mohammed Abdul Samad y Sujeet K. Sinha. "Polymer Tribological Coatings". En Encyclopedia of Tribology, 2608–14. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_836.

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Leyland, Adrian y Allan Matthews. "Optimization of Nanostructured Tribological Coatings". En Nanostructured Coatings, 511–38. New York, NY: Springer New York, 2006. http://dx.doi.org/10.1007/978-0-387-48756-4_12.

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Silva, Francisco J. G. "Nanoindentation on Tribological Coatings". En Applied Nanoindentation in Advanced Materials, 111–33. Chichester, UK: John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781119084501.ch5.

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Chromik, Richard R., Sima Ahmad Alidokht, J. Michael Shockley y Yinyin Zhang. "Tribological Coatings Prepared by Cold Spray". En Cold-Spray Coatings, 321–48. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67183-3_11.

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Martin, Peter. "Ion Implantation: Tribological Applications". En Medical Coatings and Deposition Technologies, 473–94. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119308713.ch13.

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Martin, Peter. "Tribological Coatings for Biomedical Devices". En Medical Coatings and Deposition Technologies, 181–231. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119308713.ch6.

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Gardos, M. N. "Tribological Behavior of Polycrystalline Diamond Films". En Protective Coatings and Thin Films, 185–96. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5644-8_15.

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Voevodin, Andrey A., Jeffrey S. Zabinski y John G. Jones. "Pulsed Laser Deposition of Tribological Coatings". En Pulsed Laser Deposition of Thin Films, 585–609. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/9780470052129.ch23.

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Sahoo, Prasanta y Arkadeb Mukhopadhyay. "Tribological Measurement of Electroless Nickel Coatings". En Materials Forming, Machining and Tribology, 125–51. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03822-9_5.

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Richard, Caroline. "Tribological Coatings for High-Temperature Applications". En Encyclopedia of Tribology, 3778–87. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_1194.

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Actas de conferencias sobre el tema "Tribological coatings"

Maschewske, Max, Kimm Karrip y Carol Lynn Deck. "Advanced Tribological Assessment of Ring Coatings". En ASME 2012 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icef2012-92139.

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Friction reduction within the power cylinder assembly of internal combustion engines continues to be a one of the foremost focuses of engine manufactures. In an effort to better address this topic previously developed bench test rigs, such as the Falex, Cameron-Plint, and EMA-LS9 [1,2], have been utilized. These devices were formerly focused solely on wear mechanisms and material compatibility. Current development of new piston ring coatings has demanded significant refinements to the previously mentioned EMA-LS9 test rig for specific frictional characteristic evaluations. These developments have allowed for coefficient of friction ranking between various piston ring materials in addition to the influence and surface finish on coefficient of friction. This paper examines how the test rig is utilized to characterize upper compression ring materials, surface treatments, and the impact of surface finish. The significance of these results will be examined as it applies to analytical evaluations. From these calculations a demonstration of the effect of surface finish on ring dynamics and gas flow, as well as future piston ring coating developments will be discussed.

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Pan, Liming, Ben Dawson, Jacqueline Krim, Colin Baker, James Pearson, Mohammed Zikry y Andrey Vovoedin. "Nanoscale Design of Adaptive Tribological Coatings". En STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71196.

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We report a joint theoretical and experimental study of the tribological properties of gold-yttrium stabilized zirconia (YSZ) based nanocomposite coatings, with a focus on the role of nanocrystalline grain size. Nanocomposites hold great promise for space and ambient applications, on account of their ability to adapt to and exhibit low friction and wear rates in constantly varying environmental conditions. Their internal structure has been the topic of prior literature, but the impact of grain size on tribological performance has heretofore not been considered, and the surface topology has not been reported. As such, we have performed both experimental and theoretical studies, to model the impact of grain size on film stress and wear attributes, and to document surface region grain size distributions through scanning tunneling microscopy (STM) measurements of self-affine fractal scaling properties. Nanocrystalline gold crystal sizes, as determined from STM and x-ray diffraction (XRD) data are consistent with those inferred from high resolution transmission electron microscopy (HRTEM) measurements. Our modeling results associate smaller grain sizes with lower wear rates, consistent with experiments. The findings show promise for nanoscale customization of coatings so as to tailor them at the nanoscale in an application specific manner.

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Ring, Peter J., Prodyot Roy, Gary B. Schuster y Herbert J. Busboom. "Progress in SP-100 Tribological Coatings". En 27th Intersociety Energy Conversion Engineering Conference (1992). 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1992. http://dx.doi.org/10.4271/929235.

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Claveria, Isabel, Aleida Lostalé, Cristina Zubizarreta, Gemma Mendoza, Ángel Fernández, Pere Castell y Daniel Elduque. "Enhancement of Tribological Behavior of ZrCN Coating". En 1st Coatings and Interfaces Web Conference. Basel, Switzerland: MDPI, 2019. http://dx.doi.org/10.3390/ciwc2019-06158.

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Kleyman, A. y L. Kamo. "Improved High Temperature Iron Oxide Based Tribological Coatings". En ITSC 1996, editado por C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0135.

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Abstract The experimental results of developing tribological surface coatings for high temperature application are presented. The primary focus of this work was in the area of high output advanced, low heat rejection (LHR) diesel engines, where high temperature lubrication between the piston ring and the cylinder liner wall surface is essential. The target temperature focused upon in our research is an operating top ring reversal temperature of approximately 1000° F. The technology developed typically involves treating a porous thermal spray coating with chemical binders improving coating strength and integrity and eliminating open porosity to form an almost monolithic appearing coating. The effectiveness of the densification through the coating thickness was studied. It has been shown that densification process improves mechanical properties and dramatically extends coating wear resistance. Good results were obtained using densified plasma spray Iron oxide (hematite) for a cylinder liner coating versus plasma sprayed Tribaloy T 800 for piston ring. Single Cylinder LHR engine test successfully demonstrated the feasibility of this tribological pair for the possible future applications.

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Gaydaenko, A., I. Palehova, B. Sereda y D. Sereda. "Advanced Tribological Coatings Titanium Based Coatings Obtaining under SHS Conditions". En MS&T19. TMS, 2019. http://dx.doi.org/10.7449/2019mst/2019/mst_2019_380_387.

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Xia, Z. Z., J. P. Tu, D. M. Lai, L. L. Zhang, Q. Wang, L. M. Chen y D. N. He. "Tribological Properties of Magnetron Sputtered MoS2/Metal (Ti, Mo) Nanocomposite Coatings". En World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63588.

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The MoS2/metal (Ti, Mo) nanocomposite coatings were deposited on aluminum alloy substrate by magnetron sputtering. The morphology and microstructure of the coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). The tribological properties of MoS2/metal (Ti, Mo) nanocomposite coatings were investigated using a ball-on-disk tribometer in ambient air. The MoS2/Ti nanocomposite coating showed lower friction coefficient and higher wear resistance as compared to the pure MoS2 coating, which were caused by the microstructure of the composite coating that serve as perfect intermediate lubricants between the contact faces. The effects of metal inclusion in the composite coatings were further discussed combined with the former reports.

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Otmianowski, T., B. Antoszewski y W. Zorawski. "Local Laser Treatment of Tribological Plasma Sprayed Coatings". En ITSC 1998, editado por Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1333.

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Abstract In the article the results of set of experiments concerning the changes in microstructure of plasma sprayed Al2O3, Cr2O3 and W2C coatings of tribological test pieces obtained with use of locally applied laser beam treatment are given and discussed. The improvement of sprayed on coating layer adhesion to the steel base was ascertained and evaluated. The possibilities of the application of the described technology for development and production of slide elements of tribological joints are noticed.

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"Microstructure and Tribological Properties of DLC Coatings". En Terotechnology XI. Materials Research Forum LLC, 2020. http://dx.doi.org/10.21741/9781644901038-26.

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Informes sobre el tema "Tribological coatings"

CJ Larkin, JD Edington y BJ Close. A Review of Tribological Coatings for Control Drive Mechanisms in Space Reactors. Office of Scientific and Technical Information (OSTI), febrero de 2006. http://dx.doi.org/10.2172/884665.

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Perry, Scott S. Temperature Dependent Studies of the Tribological Properties of Carbide and Nitride Hard Coatings. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 2000. http://dx.doi.org/10.21236/ada383260.

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Jungk, John Michael, Michael Thomas Dugger, Steve M. George, Somuri V. Prasad, Robert K. Grubbs, Neville Reid Moody, Thomas Michael Mayer, Thomas W. Scharf, Ronald S. Goeke y William W. Gerberich. LDRD Project 52523 final report :Atomic layer deposition of highly conformal tribological coatings. Office of Scientific and Technical Information (OSTI), octubre de 2005. http://dx.doi.org/10.2172/875621.

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Naylor, M. Development of wear-resistant ceramic coatings for diesel engine components. Volume 1, Coating development and tribological testing: Final report: DOE/ORNL Ceramic Technology Project. Office of Scientific and Technical Information (OSTI), junio de 1992. http://dx.doi.org/10.2172/10176352.

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Fountzoulas, Costas G., John D. Demaree, Louis C. Sengupta, James K. Hirvonen y Dimitar Dimitrov. Wear and Tribological Properties of Silicon-Containing Diamond-Like Carbon (Si-DLC) Coatings Synthesized with Nitrogen, Argon Plus Nitrogen, and Argon Ion Beams. Fort Belvoir, VA: Defense Technical Information Center, junio de 1998. http://dx.doi.org/10.21236/ada347548.

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Beatty, John H., Paul J. Huang, Constantine G. Fountzoulas y John V. Kelly. Tribological Evaluation of Magnetron-Sputtered Coating for Military Applications. Fort Belvoir, VA: Defense Technical Information Center, febrero de 1999. http://dx.doi.org/10.21236/ada360673.

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Strelnytskiy, Volodymyr E. Characterization and Optimization of Vacuum-arc Plasma Generator for Nanocomposite Tribological Coating Growth. Fort Belvoir, VA: Defense Technical Information Center, abril de 2008. http://dx.doi.org/10.21236/ada524437.

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Tribological investigations of composites and other selected materials sliding against vacuum-deposited MoS* coatings. Gaithersburg, MD: National Institute of Standards and Technology, 1992. http://dx.doi.org/10.6028/nist.ir.4959.

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