Tribological Performance of Nickel-Plated Regular Hexagonal Texture on a Brass Surface Under Boundary Lubrication

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
Xiangbo Chen ◽  
Xiaofang Huang ◽  
Zhenping Wan ◽  
Longsheng Lu ◽  
Zhihui Zhang
Keyword(s):  
Friction Coefficient ◽  
Boundary Lubrication ◽  
Photoelectron Spectroscopy ◽  
Resistance Mechanism ◽  
Electroless Nickel ◽  
Tribological Performance ◽  
Wear Loss ◽  
Cu Alloy ◽  
Brass Surface ◽  
Novel Strategy

Abstract A novel bio-inspired nickel-plated regular hexagonal texture (NPRHT) was proposed and fabricated by photolithography combined with electroless nickel plating to improve the tribological performance of a shaft/bushing bearing under boundary lubrication. The friction coefficient, wear loss, and wear resistance mechanism of the NPRHT that was fabricated on the brass surface were investigated under line contact sliding. It is found that the nickel-plated textured samples show a lower friction coefficient than the non-textured samples with a maximum reduction of 43.6% at a sliding speed of 0.02 m/s. The wear rate coefficient of the nickel-plated textured sample decreases by 42.86% compared with that of the non-textured sample. The energy dispersive spectrometry and X-ray photoelectron spectroscopy analysis confirm that the nickel element is transferred from the nickel-plated textured area to the brass zone, resulting in the formation of a Ni/Cu alloy, NiO and Ni2O3 successively. These three films can improve lubricity, repair wear defects, and protect surfaces from oxidation. The experimental results show that the NPRHT provides a novel strategy to manage the friction and wear of shaft/bushing bearings under boundary lubrication.

Wear Behavior of Graphite-Dispersed Al-Sn-Si Alloys

2004 ◽  
Vol 449-452 ◽  
pp. 629-632
Author(s):  
M. Tagami ◽  
A. Sugafuji ◽  
Y. Yabumoto ◽  
Ken-Ichi Ohguchi ◽  
A. Muto
Keyword(s):  
Stainless Steel ◽  
Friction Coefficient ◽  
Boundary Lubrication ◽  
Applied Load ◽  
Wear Behavior ◽  
Base Alloy ◽  
Wear Loss ◽  
Graphite Particles ◽  
Cu Alloy ◽  
Cast Alloys

The stirring technique was used to produce Al-6mass%Sn-3mass%Si-1mass%Cu alloy with 5~8wt% graphite additions. The friction coefficient and wear loss of the graphite-dispersed Al-Sn-Si alloys were measured against commercial stainless steel (SUS304) in the boundary lubrication. Although the graphite particles added up to 8mass% do not improved the friction coefficient of as-cast alloys at the lower applied load, an applied load for the Al-Sn-Si alloy with 5~8wt% of graphite additions reaches 0.60MPa,whereas that for the non-added base alloy is only 0.45MPa.

Tribological properties of trimellitates containing polymethacrylates viscosity modifiers

2017 ◽  
Vol 232 (7) ◽  
pp. 882-889 ◽  
Author(s):  
Yan Zhao ◽  
Weimin Li ◽  
Xiaobo Wang ◽  
Jing Wang
Keyword(s):  
Friction Coefficient ◽  
Boundary Lubrication ◽  
Adsorbed Layer ◽  
Physical Property ◽  
Tribological Performance ◽  
Film Forming ◽  
Wide Range ◽  
Viscosity Modifiers ◽  
Lubrication Conditions ◽  
Reducing Properties

In the present work, physical property, film-forming property, and tribological performance of three trimellitates and their blends with polymethacrylates viscosity modifiers were investigated. The results showed that the addition of polymethacrylate can significantly improve the viscosity and low temperature fluidity of the base fluids, while exerting slight influence on the viscosity-temperature properties and film forming performance. Tribological tests showed that under boundary lubrication conditions, polymethacrylate modified lubricants exhibit better friction reducing properties over a wide range of temperature and load. However, under high temperature or high load, the performance is weakened. This phenomenon should be due to the formation and destruction of the physically absorbed layer of the polymethacrylate polymer molecular on the metal surface. Under moderate boundary lubrication conditions, the physically absorbed layer can effectively prevent the direct contact of rubbing surface, resulting in a reduction of friction coefficient, while under more severe boundary lubrication conditions, the adsorbed layer is destroyed and the friction coefficient increases again.

Influence of Additive Chemistry on the Tribological Behavior of Steel/Copper Friction Pairs

2021 ◽  
Author(s):  
Weimin Li ◽  
Huaigang Su ◽  
Yunlong Chen ◽  
Rui Ma ◽  
Gaiqing Zhao ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Boundary Lubrication ◽  
High Performance ◽  
Tribological Behavior ◽  
Tribological Performance ◽  
Copper Oxides ◽  
Wear Volume ◽  
Base Oil ◽  
Lubrication Film ◽  
Order Of Magnitude

Abstract The tribological behavior of boundary lubrication is largely dominated by the anti-wear additives. Here five different anti-wear additives were selected and their tribological properties for a steel-copper contact were investigated. It was found that the tribological performance are highly depending on the anti-wear additive chemistry which determines activity, element compositions of the additive. An amine phosphate anti-wear additive AW 316 exhibit best tribological performance with the lowest mean friction coefficient of 0.082 and smallest wear volume which is more than one order of magnitude smaller than base oil. The friction-reducing order of the tested anti-wear additives are AW 316 > ZDDP > 353 > TCP > [P8888][DEHP] while anti-wear showed similar trend. In addition, the tribological mechanism of AW 316 were also discussed based on surface analysis results, and it was found that an even boundary lubrication film of 10–15 nm which was composed of copper oxides, phosphates, amines was formed on the copper disc and is responsible for its outstanding tribological performances. This study provides fundamental insights of the compatibilities among steel-copper friction pairs and suitable anti-wear additives, which can be beneficial for the development of high performance used for steel-copper friction pairs.

Negative Synergism between Corrosion and Wear of Nickel-Free Austenitic Stainless Steel in Artificial Body Solution

2009 ◽  
Vol 610-613 ◽  
pp. 1183-1187 ◽  
Author(s):  
Guang Hong Zhou ◽  
Yue Zhang ◽  
Hong Yan Ding
Keyword(s):  
Stainless Steel ◽  
Friction Coefficient ◽  
Austenitic Stainless Steel ◽  
Photoelectron Spectroscopy ◽  
Wear Behavior ◽  
Surface Film ◽  
Interactive Effect ◽  
Aqueous Media ◽  
Wear Loss ◽  
Distilled Water

The reciprocating corrosion wear behavior of a nickel-free austenitic stainless steel 13Cr24Mn0.44N flat against a Si3N4 ceramic counter ball was investigated in two kinds of aqueous such as artificial body solution and distilled water by using the ball-on-flat configuration with 300 μm amplitude at various normal loads. The worn surfaces of the new stainless steel were observed by scanning electron microscopy (SEM). Elements valence in wear scars were also detected by X-ray photoelectron spectroscopy (XPS). The influences of the load and aqueous media on the friction coefficient and wear resistance of the new stainless steel were analyzed. It is clear that the friction coefficient decreased in both aqueous with the load increasing. The lubricative surface film formed on the wear scars in the artificial body solution could reduce the friction coefficient, and result in a lower wear loss in the artificial body solution than that in the distilled water, which demonstrates a negative interactive effect between wear and corrosion.

EVALUATION OF TRANSFORMED LAYER HARDNESS OF DLC COATING AFTER FRICTION TEST

2016 ◽  
Vol 78 (10-3) ◽  
Author(s):  
Nor Azmmi Masripan ◽  
Yosuke Tsukiyama ◽  
Kenji Ohara ◽  
Noritsugu Umehara ◽  
Hiroyuki Kousaka ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Boundary Lubrication ◽  
Scratch Test ◽  
Tribological Performance ◽  
Diamond Like Carbon ◽  
Friction Test ◽  
Friction Behavior ◽  
Sliding Interface ◽  
Dlc Coating

Diamond-like carbon (DLC) provide very excellence performance in term of friction coefficient and wear resistance under boundary   lubrication. the  nano characteristic of the transformed  layer has not  been studied  in terms  of its  hardness  which is believed to  have a significant  effect in the tribological  performance. This study presented the scratch test of the DLC transformed layer was obtained from the AFM scratch test that governs the friction behavior of DLC. As a result, the hardness of the DLC transformed layer depends on the oil temperature, where the sliding interface of DLC softened during the friction test due to graphitization process

scholarly journals Effect of Low Hydroxyapatite Loading Fraction on the Mechanical and Tribological Characteristics of Poly(Methyl Methacrylate) Nanocomposites for Dentures

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 857
Author(s):  
Ahmed Fouly ◽  
Ahmed Mohamed Mahmoud Ibrahim ◽  
El-Sayed M. Sherif ◽  
Ahmed M.R. FathEl-Bab ◽  
A.H. Badran
Keyword(s):  
Friction Coefficient ◽  
Yield Strength ◽  
Methyl Methacrylate ◽  
Weight Fraction ◽  
Tribological Characteristics ◽  
Compressive Yield Strength ◽  
Wear Loss ◽  
Mechanical Mixing ◽  
Poly Methyl Methacrylate ◽  
Mechanical And Tribological Characteristics

Denture base materials need appropriate mechanical and tribological characteristics to endure different stresses inside the mouth. This study investigates the properties of poly(methyl methacrylate) (PMMA) reinforced with different low loading fractions (0, 0.2, 0.4, 0.6, and 0.8 wt.%) of hydroxyapatite (HA) nanoparticles. HA nanoparticles with different loading fractions are homogenously dispersed in the PMMA matrix through mechanical mixing. The resulting density, Compressive Young’s modulus, compressive yield strength, ductility, fracture toughness, and hardness were evaluated experimentally; the friction coefficient and wear were estimated by rubbing the PMMA/HA nanocomposites against stainless steel and PMMA counterparts. A finite element model was built to determine the wear layer thickness and the stress distribution along the nanocomposite surfaces during the friction process. In addition, the wear mechanisms were elucidated via scanning electron microscopy. The results indicate that increasing the concentration of HA nanoparticles increases the stiffness, compressive yield strength, toughness, ductility, and hardness of the PMMA nanocomposite. Moreover, tribological tests show that increasing the nanoparticle weight fraction considerably decreases the friction coefficient and wear loss.

scholarly journals Does laser surface texturing really have a negative impact on the fatigue lifetime of mechanical components?

Friction ◽  
2021 ◽  
Author(s):  
Chia-Jui Hsu ◽  
Andreas Stratmann ◽  
Simon Medina ◽  
Georg Jacobs ◽  
Frank Mücklich ◽  
...  
Keyword(s):  
Boundary Lubrication ◽  
Surface Texturing ◽  
Contact Stresses ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Wear Loss ◽  
Textured Surface ◽  
Periodic Patterns ◽  
Rolling Bearings ◽  
Fatigue Lifetime

AbstractLaser surface texturing (LST) has been proven to improve the tribological performance of machine elements. The micro-scale patterns manufactured by LST may act as lubricant reservoirs, thus supplying oil when encountering insufficient lubrication. However, not many studies have investigated the use of LST in the boundary lubrication regime, likely due to concerns of higher contact stresses that can occur with the increasing surface roughness. This study aims to examine the influence of LST on the fatigue lifetime of thrust rolling bearings under boundary lubrication. A series of periodic patterns were produced on the thrust rolling bearings, using two geometrically different designs, namely cross and dimple patterns. Base oil ISO VG 100 mixed with 0.05 wt% P of zinc dialkyldithiophosphate (ZDDP) was supplied. The bearings with cross patterns reduce the wear loss by two orders of magnitude. The patterns not only retain lubricant in the textured pockets but also enhance the formation of an anti-wear tribofilm. The tribofilm generation may be improved by the higher contact stresses that occur when using the textured surface. Therefore, in contrast to the negative concerns, the ball bearings with cross patterns were instead found to increase the fatigue life by a factor of three.

scholarly journals Comparison Between the Action of Nano-Oxides and Conventional EP Additives in Boundary Lubrication

Lubricants ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 54
Author(s):  
Valdicleide Silva Mello ◽  
Marinalva Ferreira Trajano ◽  
Ana Emilia Diniz Silva Guedes ◽  
Salete Martins Alves
Keyword(s):  
Friction Coefficient ◽  
Boundary Lubrication ◽  
Friction And Wear ◽  
Film Formation ◽  
Environmental Issues ◽  
Protective Film ◽  
Extreme Pressure ◽  
Extreme Pressure Additives ◽  
Environmental Requirements ◽  
Lubrication Conditions

Additives are essential in lubricant development, improving their performance by the formation of a protective film, thus reducing friction and wear. Some such additives are extreme pressure additives. However, due to environmental issues, their use has been questioned because their composition includes sulfur, chlorine, and phosphorus. Nanoparticles have been demonstrated to be a suitable substitute for those additives. This paper aims to make a comparison of the tribological performance of conventional EP additives and oxides nanoparticles (copper and zinc) under boundary lubrication conditions. The additives (nanoparticles, ZDDP, and sulfur) were added to mineral and synthetic oils. The lubricant tribological properties were analyzed in the tribometer HFRR (high frequency reciprocating rig), and during the test, the friction coefficient and percentual of film formation were measured. The wear was analyzed by scanning electron microscopy. The results showed that the conventional EP additives have a good performance owing to their anti-wear and small friction coefficient in both lubricant bases. The oxides nanoparticles, when used as additives, can reduce the friction more effectively than conventional additives, and displayed similar behavior to the extreme pressure additives. Thus, the oxide nanoparticles are more environmentally suitable, and they can replace EP additives adapting the lubricant to current environmental requirements.

The Influence of the Addition of Ti on the Mechanical Properties of W-S-Ti Coatings

2006 ◽  
Vol 514-516 ◽  
pp. 687-691 ◽  
Author(s):  
Manuel Evaristo ◽  
Ana Nossa ◽  
Albano Cavaleiro
Keyword(s):  
Mechanical Properties ◽  
Friction Coefficient ◽  
Tribological Performance ◽  
The Self ◽  
Wear Coefficient ◽  
Gradual Loss ◽  
Order Of Magnitude ◽  
Amorphous Structures ◽  
Ti Content ◽  
Ti Films

In this work, W-S-Ti films were deposited by r.f. magnetron sputtering, using simultaneously WS2 and Ti targets. The atomic percentage of Ti in the coating was varied from 0 at.% up to 28 at.%. No significant variations in the S/W ratio with the increase of Ti content were observed. The increasing Ti contents in the films led to a gradual loss of crystallinity. Coatings with contents greater than ≈ 16 at.% only presents a broad peak characteristic of amorphous structures. Alloying the films with Ti led to significant improvements in the hardness (from 0.3 to 8.9 GPa). Also, the adhesive critical load continuously grew with the increase of the Ti content in the films. The wear coefficient of the films dropped more than one order of magnitude with the increase of Ti content whereas the friction coefficient was kept fairly constant with just a small increase in relation to single W-S film. In conclusion, to have a good tribological performance, the addition of Ti to the films should be balanced in order that the increase of the mechanical properties does not lead to severe loss of the self-lubricant properties.

Sign in / Sign up

Export Citation Format

Share Document