A Comparative Study on the Effect of Surface Topography by Hard Turning vs. Grinding on Frictional Performance at Dry and Lubricated Sliding Contact

2008 ◽  
Author(s):  
R. A. Waikar ◽  
Y. B. Guo
Keyword(s):  
Surface Topography ◽  
White Layer ◽  
Frictional Coefficient ◽  
Solid Lubricants ◽  
Bearing Steel ◽  
Tribological Performance ◽  
Sliding Contact ◽  
Frictional Performance ◽  
Dry Conditions ◽  
Frictional Coefficients

Machining-induced surface topography has a significant effect on tribological performance of machined components in sliding contact. However, the effect of different surface topography by turning versus grinding on tribological performance has received very little attention. In this study four types of surface topography by turning and grinding AISI 52100 bearing steel (62 HRc) were prepared and characterized to study its effect on friction and wear in sliding contact. Dry and lubricated reciprocating sliding wear tests with an on-line acoustic emission (AE) sensor were carried out using a ball-on-disk tribometer. The experimental results have shown that: (i) the turned surfaces, regardless of the presence of a white layer, yield smaller friction of coefficients in sliding along feed marks than across sliding at both dry and lubricated conditions. However, the opposite hold true for the ground surfaces; (ii) friction of coefficients (0.6∼0.8) at dry conditions is higher for both turned and ground fresh surfaces than their white layer counterparts regardless of sliding direction. At lubricated conditions, Friction of coefficients (0.1∼0.12) are smaller for the both turned and ground fresh surfaces than the white layer surfaces in along sliding, while it is equivalent in across sliding; (iii) the trends of acoustic amplitude amplitude are consistent with those of frictional coefficients for the turned or ground surfaces at dry conditions. Similar trends are also true for the turned surfaces at lubricated conditions, but not for the ground surfaces; and (iv) the wear debris on the track may act as solid lubricants to reduce the sliding frictional coefficient. Machining induced white layers leads to a better wear resistance than the fresh surfaces in either along or across sliding.

The Effect of Machining Induced White Layer on Frictional and Wear Performance at Dry and Lubricated Sliding Contact

2009 ◽  
Author(s):  
R. A. Waikar ◽  
Y. B. Guo
Keyword(s):  
Wear Debris ◽  
White Layer ◽  
Solid Lubricants ◽  
Sliding Contact ◽  
Third Body ◽  
Machined Surface ◽  
Wear Performance ◽  
The Third ◽  
The Coefficient Of Friction ◽  
Dry Conditions

A white layer on a machined surface is often produced at abusive machining conditions. However, the effect of white layer on frictional and wear performance has received little attention. This study has shown that the existence of a turned white layer slightly decreases the coefficient of friction (COF), while a ground white layer significantly increases COF at dry conditions. At lubricated conditions, the turned white layer only slightly increases COF while the ground white layer slightly reduces it. The third body wear debris may act as solid lubricants leading to reduced friction.

scholarly journals Analysis of the lubrication process with composition of solid lubricants of laser-modified sliding surfaces

2020 ◽  
Vol 12 (4) ◽  
pp. 168781402091607 ◽  
Author(s):  
Hao Wang ◽  
Xuan Xie ◽  
Xijun Hua ◽  
Sheng Xu ◽  
Bifeng Yin ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Molybdenum Disulfide ◽  
Sliding Friction ◽  
Orthogonal Experiment ◽  
Solid Lubricants ◽  
Bearing Steel ◽  
Tribological Performance ◽  
Gcr15 Bearing Steel ◽  
Deposition Processes ◽  
Composite Solid

Solid lubricants have been applied diffusely in numerous domains. This article investigates the impacts of each component in composite solid lubricants on the tribological performance and compares the antifriction effects of different kinds of solid lubricants to solve the lubrication problem of sliding bearing. Surface textures with dimples were fabricated on the surfaces of GCr15 bearing steel by a Q-switched solid-state Nd:YAG laser. The composite solid lubricants were filled in the micro-dimples by the deposition processes of heat-maintaining and pressure-maintaining, consisting of blinding elements and lubricating elements. Tribological performances under sliding friction for different kinds of adhesives and lubricants with different grain sizes were evaluated by ring-on-disk tribometer. On this basis, an orthogonal experiment of four factors and three levels (34) was designed to investigate the impacts of different components of the solid lubricants on the tribological performance. Solid lubricants with nanoparticles can enhance antifriction ability: the friction coefficient of nano-graphite is 18.9% lower than that of micron-graphite, and the friction coefficient of nano-sized molybdenum disulfide declines 7.6% comparing to that of micron-sized molybdenum disulfide. According to the results of the orthogonal experiment, the optimal formula of the composite solid lubricants was graphite:molybdenum disulfide:polyimide:carbon nano-tubes = 4:1:0.5:0.4.

scholarly journals Two-scale homogenization of hydrodynamic lubrication in a mechanical seal with isotropic roughness based on the Elrod cavitation algorithm

2021 ◽  
pp. 135065012110176
Author(s):  
Yanxiang Han ◽  
Qingen Meng ◽  
Gregory de Boer
Keyword(s):  
Surface Topography ◽  
Carrying Capacity ◽  
Hydrodynamic Lubrication ◽  
Tribological Performance ◽  
Stribeck Curve ◽  
Polar Coordinate System ◽  
Load Carrying Capacity ◽  
Mechanical Seal ◽  
Macro Scale ◽  
Load Carrying

A two-scale homogenization method for modelling the hydrodynamic lubrication of mechanical seals with isotropic roughness was developed and presented the influence of surface topography coupled into the lubricating domain. A linearization approach was derived to link the effects of surface topography across disparate scales. Solutions were calculated in a polar coordinate system derived based on the Elrod cavitation algorithm and were determined using homogenization of periodic simulations describing the lubrication of a series of surface topographical features. Solutions obtained for the hydrodynamic lubrication regime showed that the two-scale homogenization approach agreed well with lubrication theory in the case without topography. Varying topography amplitude demonstrated that the presence of surface topography improved tribological performance for a mechanical seal in terms of increasing load-carrying capacity and reducing friction coefficient in the radial direction. A Stribeck curve analysis was conducted, which indicated that including surface topography led to an increase in load-carrying capacity and a reduction in friction. A study of macro-scale surface waviness showed that the micro-scale variations observed were smaller in magnitude but cannot be obtained without the two-scale method and cause significant changes in the tribological performance.

scholarly journals Analysis of Chemisorbed Tribo-Film for Ceramic-on-Ceramic Hip Joint Prostheses by Raman Spectroscopy

2021 ◽  
Vol 12 (2) ◽  
pp. 29
Author(s):  
Risha Rufaqua ◽  
Martin Vrbka ◽  
Dušan Hemzal ◽  
Dipankar Choudhury ◽  
David Rebenda ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Hyaluronic Acid ◽  
Hip Joint ◽  
Total Joint Replacement ◽  
Film Formation ◽  
Frictional Coefficient ◽  
Synovial Fluids ◽  
Frictional Coefficients ◽  
Joint Prostheses ◽  
Ceramic On Ceramic

To understand the possible lubricant mechanism in ceramic-on-ceramic hip joint prostheses, biochemical reactions of the synovial fluid and the corresponding frictional coefficients were studied. The experiments were performed in a hip joint simulator using the ball-on-cup configuration with balls and cups made from two types of ceramics, BIOLOX®forte and BIOLOX®delta. Different lubricants, namely albumin, γ-globulin, hyaluronic acid and three model synovial fluids, were studied in the experiments and Raman spectroscopy was used to analyze the biochemical responses of these lubricants at the interface. BIOLOX®delta surface was found less reactive to proteins and model fluid lubricants. In contrast, BIOLOX®forte ball surface has shown chemisorption with both proteins, hyaluronic acid and model fluids imitating total joint replacement and osteoarthritic joint. There was no direct correlation between the measured frictional coefficient and the observed chemical reactions. In summary, the study reveals chemistry of lubricant film formation on ceramic hip implant surfaces with various model synovial fluids and their components.

Tribological property of the cobalt—chromium femoral head with different regions of wear in total hip arthroplasty

2009 ◽  
Vol 224 (4) ◽  
pp. 541-549 ◽  
Author(s):  
C-T Duong ◽  
J-S Nam ◽  
E-M Seo ◽  
B P Patro ◽  
J-D Chang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Femoral Head ◽  
Total Hip Arthroplasty ◽  
Tribological Properties ◽  
Hip Arthroplasty ◽  
Frictional Coefficient ◽  
Cobalt Chromium ◽  
Bearing Materials ◽  
Frictional Coefficients ◽  
Wear Region

The tribological properties of engineering and biological materials have been investigated at microscale levels through the calculation of the surface roughness and frictional coefficient using atomic force microscopy (AFM). Although a number of previous studies have reported the frictional coefficients of diverse bearing materials in total hip arthroplasty (THA), the relationship between the surface roughness and frictional coefficient of bearing materials of THA have not been reported, and furthermore, the tribological properties for different wear regions of a cobalt-chromium (Co—Cr) femoral head have not been well identified. Therefore, the objective of this study is to investigate the relationships between the surface roughness, frictional coefficient, and hardness for both the main-wear and the least-wear regions of a Co—Cr femoral head 10 years after THA. The average Vickers hardness of the Co—Cr femoral head was 380.7 ± 11.3 HV. With the scanned area of 25 μm×25 μm through AFM, the frictional coefficients of the main-wear and the least-wear regions were 0.229 ± 0.054 and 0.243 ± 0.059, respectively, and showed no statistical differences between these two regions ( p = 0.449). However, differences in the surface roughness ( Rq) between the main-wear region ( Rq = 96.5 ± 26.2 nm) and the least-wear region ( Rq = 17.7 ± 4.2 nm) were statistically significant ( p<0.0001). The results of the current study suggest that the frictional property of the Co—Cr femoral head is not significantly correlated with its surface roughness, and also provide guidelines for improving the surface characteristics of metallic implant materials.

scholarly journals Tribology of 2D Nanomaterials: A Review

2020 ◽  
Author(s):  
Paul С. Uzoma ◽  
Huan Hu ◽  
Mahdi Khadem ◽  
Oleksiy V. Penkov
Keyword(s):  
High Performance ◽  
2D Materials ◽  
Chemical Properties ◽  
Solid Lubricants ◽  
Friction Behavior ◽  
Comprehensive Overview ◽  
Wear Rates ◽  
Recent Developments ◽  
Frictional Coefficients ◽  
Physical And Chemical

The exfoliation of graphene has opened a new frontier in material science with a focus on 2D materials. The unique thermal, physical and chemical properties of these materials have made them one of the choicest candidates in novel mechanical and nano-electronic devices. Notably, 2D materials such as graphene, MoS2, WS2, h-BN, and Black Phosphorus have shown outstanding lowest frictional coefficients and wear rates, making them attractive materials for high-performance nano-lubricants and lubricating applications. The objective of this work is to provide a comprehensive overview of the most recent developments in the tribological potentials of 2D materials. At first, the essential physical, wear, and frictional characteristics of the 2D materials including their production techniques are discussed. Subsequently, the experimental explorations and theoretical simulations of the most common 2D materials are reviewed in regards to their tribological applications such as their use as solid lubricants and surface lubricant nano-additives. The effects of micro/nano textures on friction behavior are also reviewed. Finally, the current challenges in tribological applications of 2D materials and their prospects are discussed.

Relationship between Contact Voltage Drop and Frictional Coefficient under High-current Sliding Contact

2010 ◽  
Vol 5 (4) ◽  
pp. 486-492 ◽  
Author(s):  
Takahiro Ueno ◽  
Kenichi Kadono ◽  
Shinji Yamaguchi ◽  
Minoru Aoyagi ◽  
Akio Tanaka ◽  
...  
Keyword(s):  
Voltage Drop ◽  
Frictional Coefficient ◽  
Sliding Contact ◽  
High Current ◽  
Contact Voltage

Modification of Tribolayers of a Titanium Alloy Sliding against a Steel

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Y. Zhou ◽  
W. Jiang ◽  
W. Chen ◽  
X. L. Ji ◽  
Y. X. Jin ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Layer Structure ◽  
Frictional Coefficient ◽  
Tribological Performance ◽  
Wear Loss ◽  
Multilayer Graphene ◽  
Double Layer Structure ◽  
Sustainable Protection ◽  
Wear Transition ◽  
Sliding Distance

The nonprotective tribolayers of the titanium alloy were modified into additives-containing tribolayers through an artificial addition of multilayer graphene (MLG), Fe2O3 nanomaterials, or their mixtures with various proportions on the titanium alloy/steel sliding interface. The sustainability of the modified tribolayers under a high load was evaluated by the critical sliding distance for a mild-to-severe wear transition. The modified tribolayers were found to significantly improve or deteriorate tribological performance of the titanium alloy, which was decided by their ingredients. The pure MLG- or Fe2O3-containing tribolayers, because of their lacking load-bearing or lubricant capacity, presented poor sustainability and readily lost protection to cause high wear loss or frictional coefficient. However, for the addition of various mixtures of MLG and Fe2O3, the modified tribolayers possessed a double-layer structure consisting of friction-reducing MLG- and wear-resistant Fe2O3-predominated layers. They presented a sustainable protection, thus remarkably improving the tribological performance of the titanium alloy.

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