Layered 2D Nanomaterials to Tailor Friction and Wear in Machine Elements—A Review

2021 ◽  
pp. 2101622
Author(s):  
Max Marian ◽  
Diana Berman ◽  
Alberto Rota ◽  
Robert L. Jackson ◽  
Andreas Rosenkranz
Keyword(s):  
Friction And Wear ◽  
Machine Elements ◽  
2D Nanomaterials

Manufacturing and Tribological Investigation of Hot Micro-Coined Lubrication Pockets

2014 ◽  
Vol 611-612 ◽  
pp. 417-424 ◽  
Author(s):  
Adam Szurdak ◽  
Andreas Rosenkranz ◽  
Carsten Gachot ◽  
Gerhard Hirt ◽  
Frank Mücklich
Keyword(s):  
Friction And Wear ◽  
Surface Texturing ◽  
Wear Volume ◽  
Forming Process ◽  
Surface Textures ◽  
The Coefficient Of Friction ◽  
Steel Aisi ◽  
Machine Elements ◽  
Tool Damage ◽  
Lubrication Conditions

Friction and wear of lubricated machine elements can be reduced by the introduction of lubrication pockets produced by surface texturing. Different manufacturing methods can be taken into consideration whereas a forming process offers the possibility for mass production. Hot micro coining is a forming process, which allows manufacturing of surface textures with different shapes and dimensions into a flat and deformable material, e.g. seals made of steel. In this work hemispherical and ellipsoid pockets with a maximum depth of 100 µm have been embossed into stainless steel (AISI 304). To ensure that the used process parameters will not lead to tool damage, Finite Element simulations were performed and experimentally verified. First tribological experiments were conducted on a ball-on-disk tribometer in order to study the tribological properties of hemispherical structures with pockets depths of 50 and 100 µm. Different sliding velocities were applied to study the coefficient of friction and wear volume for different lubrication conditions. A comparison between coined and not‑coined specimens demonstrates that the micro coined surface textures lead to a significant reduction in the wear volume at boundary and mixed lubrication conditions.

Friction and Wear Characteristics of Diamond-Like Carbon (DLC) Coating Used for Machine Elements

2011 ◽  
Author(s):  
D. W. Kim ◽  
K. W. Kim
Keyword(s):  
Friction And Wear ◽  
Normal Load ◽  
Bearing Steel ◽  
Wear Rates ◽  
Dlc Coating ◽  
Aisi 52100 ◽  
Machine Elements ◽  
Wear Tests ◽  
Friction And Wear Characteristics ◽  
Friction And Wear Tests

In this study, friction and wear tests were performed in order to investigate the effect of sliding velocity and normal load on the friction and wear characteristics of multi-layered diamond-like carbon (DLC) coating used for machine elements (automotive engine tappet, etc). Friction and wear tests against AISI 52100 bearing steel ball were performed under various sliding velocities (0.25, 0.5, 1 and 2 m/s) and normal loads (6.13, 20.7 and 49.0 N). As a result of test, kinetic friction coefficients and wear rates of multi-layered DLC coating and AISI 52100 bearing steel were obtained under each test condition. The result showed that the kinetic friction coefficients and wear rates generally decreased with the increase in sliding velocity and normal load.

Development and Experimental Verification of a New Roller-Coining Setup to Texture Flat and Curved Surfaces

2015 ◽  
Vol 794 ◽  
pp. 128-135 ◽  
Author(s):  
Adam Szurdak ◽  
Gerhard Hirt
Keyword(s):  
Experimental Verification ◽  
Friction And Wear ◽  
Density Ratio ◽  
Curved Surfaces ◽  
Forming Force ◽  
High Reproducibility ◽  
Pocket Depth ◽  
Machine Elements ◽  
Average Factor

Micro lubrication pockets decrease the frictional losses and improve the wear resistance of lubricated machine elements. Depending on the application, the pocket dimension and the area density (ratio of the projected pocket area to the non-textured area) must be optimized. Otherwise, the lubrication pockets might increase friction and wear. Besides the determination of the optimized texture, the production process needs to manufacture the pockets with high reproducibility and accuracy, since each deviation of the texture might reduce the improvement of the tribological properties. The goal of this work is to develop a new forming setup capable of decreasing the influence of deviations in the material, of the tool or due to a process inaccuracy ́s. Therefore, a roller-coining process based on a pneumatic system was developed to keep the forming force and thus the pocket dimension constant. This setup was as well used to texture the roller, since the manufacturing of a prominent micro texture on a curved surface with high tolerances is a difficult task for other texturing methods. The experimental verification of the setup showed that by using the pneumatic setup the standard deviation of the pocket depth was reduced by an average factor of 1.9.

scholarly journals 2D-nanomaterials for controlling friction and wear at interfaces

Nano Today ◽  
2015 ◽  
Vol 10 (3) ◽  
pp. 301-314 ◽  
Author(s):  
Jessica C. Spear ◽  
Bradley W. Ewers ◽  
James D. Batteas
Keyword(s):  
Friction And Wear ◽  
2D Nanomaterials

scholarly journals Tribological Investigation on the Friction and Wear Behaviors of Biogenic Lubricating Greases in Steel–Steel Contact

2020 ◽  
Vol 10 (4) ◽  
pp. 1477
Author(s):  
Nazli Acar ◽  
José M. Franco ◽  
Erik Kuhn ◽  
David E. P. Gonçalves ◽  
Jorge H. O. Seabra
Keyword(s):  
Friction And Wear ◽  
Rolling Bearing ◽  
Friction Torque ◽  
Point Of View ◽  
Wear Model ◽  
Wear Process ◽  
Machine Element ◽  
Lubricant Analysis ◽  
Machine Elements ◽  
Tribological Contact

The applications of biogenic lubricating greases to machine elements play important roles in the reduction of friction energy and minimizing wear in a tribological contact, as well as the prevention of environmental pollution. The aim of this work was to investigate completely biogenic lubricating greases from a tribological point of view. Model greases were examined using a ball on a disc tribometer at a constant normal force to investigate the friction and wear process according to Fleischer’s energetic wear model. Using the energy-based wear model, the friction and wear process could be interpreted as a cause–effect sequence. Moreover, the influence of the model grease composition on the friction and wear process was analyzed. In addition, rolling bearing tests were performed to investigate the tribological behaviors of some selected biogenic greases during real machine element contact. These tests allowed for the quantification of the friction torque behavior of the full bearing and the evaluation of the wear obtained through lubricant analysis procedures. This experimental work provides useful information regarding the influence that the composition of biogenic model greases has on friction and wear behaviors in a tribological contact.

Analytical Electron Microscopy of Ion-Implanted Metals

1985 ◽  
Vol 43 ◽  
pp. 282-285
Author(s):  
D.I. Potter ◽  
M. Ahmed ◽  
K. Ruffing
Keyword(s):  
Electron Microscopy ◽  
Ion Implantation ◽  
Friction And Wear ◽  
Analytical Electron Microscopy ◽  
Chemical Compositions ◽  
Surface Chemical ◽  
Near Surface ◽  
The Past ◽  
Analytical Electron ◽  
Property Changes

Ion implantation, used extensively for the past decade in fabricating semiconductor devices, now provides a unique means for altering the near-surface chemical compositions and microstructures of metals. These alterations often significantly improve physical properties that depend on the surface of the material; for example, catalysis, corrosion, oxidation, hardness, friction and wear. Frequently the mechanisms causing these beneficial alterations and property changes remain obscure and much of the current research in the area of ion implantation metallurgy is aimed at identifying such mechanisms. Investigators thus confront two immediate questions: To what extent is the chemical composition changed by implantation? What is the resulting microstructure? These two questions can be investigated very fruitfully with analytical electron microscopy (AEM), as described below.

ANALYSIS OF AUTOMATIC TRANSMISSION USING FOURIER TRANSFORM INFRARED (FTIR) SPECTROCOPY

2019 ◽  
Vol 7 (SI-TeMIC18) ◽  
Author(s):  
Norhanifah Abdul Rahman ◽  
Matzaini Katon Katon ◽  
Nurina Alya Zulkifli Zulkifli
Keyword(s):  
Fourier Transform ◽  
Automatic Transmission ◽  
Fourier Transform Infrared ◽  
Oil Analysis ◽  
Wear Particles ◽  
Reliable Technique ◽  
Fluid Analysis ◽  
Analysis Technique ◽  
Machine Elements ◽  
Transmission Fluid

Automatic Transmission (AT) system is efficient in the aspects of vehicle safety, comfort, reliability and driving performance. The objectives of this paper are to collect the oil samples from AT systems of engine bus according to manufacturer's recommendations and analyse collected oil samples using oil analysis technique. The sample transmission fluid which was taken from the AT gearbox has been experimentally analyzed. The oil samples were taken with an interval of 5,000km, 30,000km, 50,000km, 80,000km, 180,000km and 300,000km for AT bus operation. These samples then have been analyzed by comparing between new and used transmission fluid using Fourier Transform Infrared (FTIR) spectroscopy. Oil analysis by FTIR is a form of Predictive Maintenance (PdM) to avoid major failure in machine elements. Most machine elements are not easily accessible in the transmission system. Having a reliable technique would avoid the needs to open the components unnecessarily, hence, help to prevent catastrophic failure which are very costly, and ease of regular monitoring. In order to identify the major failures of automatic gearbox, forecasts can be made regarding the lube transmission fluid analysis test. By using this test, the minor problems can be determined before they become major failures. At the end of this research, the wear particles profile for interval mileage of AT system was obtained. Keywords: Wear, Automatic Transmission (AT), Transmission fluid, Fourier Transform Infrared (FTIR), Oil analysis.

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