scholarly journals Tribology properties of hybrid graphene oxide materials as lubricant additives

2018 ◽  
Vol 226 ◽  
pp. 03019
Author(s):  
Anastasia A. Novikova ◽  
Victoria E. Burlakova ◽  
Valery N. Varavka ◽  
Tatyana G. Statsenko ◽  
Grigory B. Kharitonov ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Coefficient Of Friction ◽  
Hybrid Material ◽  
Copper Oxide Nanoparticles ◽  
Frictional Contacts ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Isopropanol Solution ◽  
Uv Visible ◽  
Synthesized Materials

Graphene oxide was synthesized by the modified Hammers method. With managed hydrolysis in isopropanol solution obtained hybrid material “graphene oxide - copper oxide nanoparticles”. The phase composition of the hybrid material was studied by X-ray phase analysis and UV-visible spectroscopy. By ultrasonic processing dispersions of synthesized materials in glycerol were produced. The concentration of lubricating additives in the lube oil was 0.05 wt. %. The tribological properties of dispersions were investigated using a pin-on-disc friction machine. Tests showed that in the presence of graphene oxide, the friction coefficient was ~0.02, while with the addition of a hybrid material, the coefficient of friction was ~0.035. This is due to various mechanisms of lubrication. Reduction of the coefficient of friction in the presence of graphene oxide is associated with the formation of tribocarbon on the porosity of frictional contacts. While the addition of a hybrid material containing the CuO nanoparticles leads to the formation of a third body.

Comparative Investigations on the Mechanical and Tribological Properties of Glass Fibre Reinforced Thermoplastic and Blended Graphene-Oxide Hybrid Thermoplastic Nanocomposites

2014 ◽  
Vol 591 ◽  
pp. 85-88 ◽  
Author(s):  
R. Geetha ◽  
Paulraj Jawahar
Keyword(s):  
Graphene Oxide ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Film Formation ◽  
Processing Temperature ◽  
Mechanical And Tribological Properties ◽  
Base Materials ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Glass Fibre Reinforced

Glass filled nylon composites (GFN) and hybrid graphene oxide reinforced glass filled Nylon nanocomposites (GO-GFN) are prepared by blending the required base materials in injection molding machine at processing temperature of 275°C. The specimens prepared are subjected to various mechanical property tests to reveal their hardness, tensile strength and flexural strength. The wear discs of GFN and GO-GFN composites as per ASTM standard are injection molded to analyze the tribological properties using pin on disc tribometer. The pin used is EN 8 Tool steel. The Coefficient of friction for the GFN composites for the wear load of 10 N is 0.28. Addition of 0.003 wt% GO to the GFN system has decreased the coefficient of friction significantly to the value of 0.12. The decrease in C.O.F was correlated with the adhesion film formation in the pin surface. This work confirms the improvement in wear resistance of GO-GFN system which is attributed by the presence of graphene oxide only.

Some Tribological Properties of an Ionic Liquid

2005 ◽  
Author(s):  
Takashi Nogi
Keyword(s):  
Ionic Liquid ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Wear Performance ◽  
Lubrication Regime ◽  
Pin On Disc ◽  
The Coefficient Of Friction

Some tribological properties of an ionic liquid were investigated by using a pin-on-disc friction and wear tester. Due to running-in, the coefficient of friction of the ionic liquid decreased with time to a very low value of 0.02 which suggests that the lubrication regime was hydrodynamic at the end of the tests. Anti-wear performance of the ionic liquid was substantially comparable to a paraffin-based oil.

Tribology of Micro Milled Surfaces

2010 ◽  
Vol 447-448 ◽  
pp. 681-684 ◽  
Author(s):  
S. Twardy ◽  
Otmann Riemer ◽  
Ekkard Brinksmeier
Keyword(s):  
Coefficient Of Friction ◽  
Tribological Behavior ◽  
End Milling ◽  
Appropriate Technology ◽  
Micro Milling ◽  
Machining Parameters ◽  
Structured Surfaces ◽  
High Form ◽  
Pin On Disc ◽  
The Coefficient Of Friction

Micro milling is an appropriate technology for the flexible production of precise micro molds with complex shapes for metal forming processes (e.g. micro deep drawing). Besides high form accuracy micro ball end milling also provides a specific surface topography which can enhance the tribological behavior during the forming processes. This paper is focusing on the tribological behavior of micro structured surfaces generated by micro milling compared to smooth surfaces. The coefficient of friction was investigated on a pin-on-disc test stand for different materials. The results of the tribological tests suggest a relationship between micro structure and coefficient of friction. Finally, the correlations between machining parameters and tribological behavior will be discussed.

scholarly journals Tribological investigation on oil blended with Additive using Response surface methodology

2020 ◽  
Vol 170 ◽  
pp. 01025
Author(s):  
Tushar Gadekar ◽  
Dinesh Kamble
Keyword(s):  
Response Surface Methodology ◽  
Wear Rate ◽  
Response Surface ◽  
Coefficient Of Friction ◽  
Comparative Investigation ◽  
Friction Model ◽  
Specific Wear Rate ◽  
Unknown Parameters ◽  
Pin On Disc ◽  
The Coefficient Of Friction

Friction and wear in dynamic parts is the primary reason for energy loss in gearbox lubrication system and this can be optimized by utilizing modified lubricant. The tribological nature of gearbox system is critically affected by factors such as type of lubricant, loading & speed etc. In latest years, multiple advanced oil and modern tribological techniques & instruments have been utilized to investigate behaviour of oil like pin on disc, Fourball tester etc. This paper presents comparative investigation of oil blended with additive for two different conditions using prediction model & RSM. The design of experimentations has been conducted by using response surface methodology. The value of inputs parameters such as concentration, load & sliding velocity ranges from 0.5 to 5 %, 60 to 100 N and 0.65 to 1.5 m/s, respectively are utilized to evaluate the outcomes of coefficient of friction and specific wear rate. At the end results from Prediction equations are compared with experimental literature based outcomes to signify the effect of parameters like blend %, load & Sliding speed. The Coefficient of friction model showed 47.57 % more closer outcomes as compared to the Specific wear rate model for specific variation of unknown parameters for pin on disc setup in oil.

scholarly journals “Wear Behaviour of Titanium Alloys When Subjected to Different Speed and Load Levels”

2020 ◽  
Vol 8 (6) ◽  
pp. 5810-5814
Keyword(s):  
Titanium Alloys ◽  
Coefficient Of Friction ◽  
High Strength ◽  
Wear Behaviour ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Wear Response ◽  
Carbon Fibre Reinforced Plastic ◽  
Titanium Grade ◽  
Plastic Components

Titanium and Titanium alloys are widely used for aircraft as a material having light weight, high strength and corrosion resistance. The titanium and its alloys are compatible with carbon fibre reinforced plastic components with respect to corrosion and thermal behaviour. Response of Titanium grade 2 and grade 12 at different speed during sliding is to be studied. The literature survey shows inadequate studies on wear response of these alloys. Experiments using pin on disc test rigs were conducted. Speed level of 500rpm, 1000rpm, and 1500 rpm were used. The sliding was found to be sensitive to sliding speed. As speed increases from 500 rpm to 1000 rpm the coefficient of friction increased. At speed of 1500 rpm two steady phase of sliding identified. In one of the steady phase the coefficient of friction was found to be more than the coefficient of friction at 1000 rpm. Where in another steady phase of sliding the coefficient of friction was found to be comparable or less then the coefficient of friction at 1000 rpm

scholarly journals Influence of WS2 Nanoparticles Lubricants on Physical Characteristics of Wrought Aluminium Alloys

2019 ◽  
pp. 1240-1250
Author(s):  
Riyadh A. Al-Samarai ◽  
Amjed Saleh Mahmood ◽  
Omar M. Ahmed
Keyword(s):  
Wear Rate ◽  
Coefficient Of Friction ◽  
Wear Mechanisms ◽  
Aluminium Alloys ◽  
Loss Rate ◽  
Physical Characteristics ◽  
Oxidative Wear ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Aisi 1045

The present study considers an influence of WS2 nanoparticles lubricants on physical characteristics of wrought Aluminium alloys. It is investigated parameters-performance relationship via tribological pin-on-disc tests, the pin is made of Aluminium alloys and the disk is made of AISI.1045, and the humidity was 70%. Oils with WS2 nanoparticles and without them reveal the loss rate of wear. In this study, the coefficient of friction (CoF) is reduced from 0.27 to 0.22 and the wear rate decreased from 0.128 x 10-6 Nm-1 to 0.107 x 10-6 Nm-1 at a load of 20 N. All worn surfaces were typically three types in wear mechanisms such as adhesive, abrasive, and oxidative wear. In addition, the use of nanoparticle enhanced the viscosity. This study showed promising results and concluded that the wrought Aluminium alloy to be the superior with WS2 nanoparticles, Furthermore, the wear rate has been reduced of 14% comparison without the use of WS2.

THE INFLUENCE OF REDUCING TEMPERATURE ON CHANGING YOUNG’S MODULUS AND THE COEFFICIENT OF FRICTION OF SELECTED SLIDING POLYMERS

Tribologia ◽  
2018 ◽  
Vol 279 (3) ◽  
pp. 107-111
Author(s):  
Anita PTAK ◽  
Piotr KOWALEWSKI
Keyword(s):  
Friction Coefficient ◽  
Young’S Modulus ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Young's Modulus ◽  
Polymeric Materials ◽  
Kinetic Friction ◽  
Mechanical And Tribological Properties ◽  
Pin On Disc ◽  
The Coefficient Of Friction

For the polymeric materials, changing of the temperature causes changes in mechanical and tribological properties of sliding pairs. The goal of the present study was to determine the change in Young's modulus and kinetic friction coefficient depending of the temperature. Three thermoplastic polymers, PA6, PET and PEEK, were tested. These materials cooperated in sliding motion with a C45 construction steel disc. As part of the experiment, the Young's modulus tests (by 3-point bending method) and kinetic friction coefficient studies (using pin-on-disc stand) were carried out. The temperature range of mechanical and tribological tests was determined at T = –50°C±20°C. Comparing the results of mechanical and tribological properties, there is a tendency to decrease the coefficient of friction as the Young's modulus increases while reducing the working temperature.

Flaky and fullerene-like WS2 nanoparticles as tribologic and toughening additives for epoxy

2016 ◽  
Vol 231 (1-2) ◽  
pp. 55-61
Author(s):  
Dietmar Haba ◽  
Andreas Hausberger ◽  
Andreas J Brunner
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Beneficial Effect ◽  
Coefficient Of Friction ◽  
Friction And Wear ◽  
Epoxy System ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Dispersion Technique ◽  
Epoxy Systems

Just like MoS2, WS2 is known for its outstanding tribologic properties. When used as additives, both were found to considerably improve the tribologic behavior of epoxy, i.e., its coefficient of friction and wear resistance. The best improvements were obtained with WS2 or MoS2 nanoparticles, in particular if they had a fullerene-like morphology. Likewise, fullerene-like WS2 nanoparticles were shown to considerably enhance the fracture toughness of epoxy. It was thus hypothesized that the improved wear resistance could be due to the toughening effect rather than due to reduced friction. Our investigations showed that both flaky and fullerene-like WS2 nanoparticles can improve the fracture toughness of certain epoxy systems, while they can embrittle others. The beneficial effect on the epoxy’s wear resistance could not be confirmed either: The coefficient of friction and wear measured in pin-on-disc tests correlated insignificantly with the type or amount of nanoparticles used or the dispersion technique applied. The fact that the fracture toughness did not correlate with the measured wear suggests that the investigated epoxy system wears by adhesion rather than by abrasion. It is thus possible that tribologic additives like WS2 are unsuited for counteracting this wear mechanism. In a nutshell, both the toughening and the wear-reducing effect of flaky and fullerene-like WS2 nanoparticles seem to depend strongly on the particular epoxy system investigated.

The Effect of Controlled Frequency and Amplitude of Vibration on Friction

2009 ◽  
Vol 147-149 ◽  
pp. 380-386 ◽  
Author(s):  
Jamil Abdo ◽  
Amer Al-Yhmadi
Keyword(s):  
Surface Roughness ◽  
Coefficient Of Friction ◽  
Nonlinear Function ◽  
Polynomial Equation ◽  
304 Stainless Steel ◽  
Sliding Speed ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Friction Function ◽  
Alloy 6061

An in-house pin-on-disc apparatus is designed and constructed to perform the tests and the design of experiments technique is utilized to determine the effect of vibration, amplitude of vibration, surface roughness, and sliding speed and their cross influence on coefficient of friction for 304 stainless steel and Alloy 6061 Aluminum. The design is performed using response surface method (RSM). The coefficient of friction (CoF) is analyzed as a nonlinear function of the factors and predicted by a second-order polynomial equation. Results suggested that the presence of vibration affect the friction function CoF considerably for both metals. The friction function linearly decreases with the increases of vibration and amplitude of vibration, non-linearly decreases with the increases of sliding speed and linearly increases with the increases of the surface roughness until the middle range is reached and then there is non-linearly decrease thereafter. Similar trends of friction functions are observed for Alloy 6061 Aluminum with a reduction of almost 15% except for the case with amplitude of vibration where the variation showed more significant affect on the friction function when Alloy 6061 Aluminum disk is used.

scholarly journals Fiber Surface Treatment Effects on Wear and Friction of Luffa/Polyester Composites

2019 ◽  
Vol 9 (2S2) ◽  
pp. 574-576
Keyword(s):  
Surface Treatment ◽  
Coefficient Of Friction ◽  
Treatment Effects ◽  
Unsaturated Polyester ◽  
Fiber Surface ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Fiber Surface Treatment ◽  
Set Up ◽  
The Impact

In this work, the extracted fiber from the luffa plant is used as for making of composite with unsaturated polyester. As received (UT) and alkali treated fibers(NT) are used for making laminates. All the composites have been made with an optimal pressure of 50 kg/cm2 with room temperature curing of 12h. Evicted specimens were cut in to the dimensions as per respective ASTM standard. The surface treatment effects on the coefficient of friction (CoF) is measured using pin- on-disc wear set-up machine. Results shows that the impact strength of the composites increased afterward surface treatment. Meantime, the coefficient of friction also increased in the treated fiber composites. Experiment is conducted for three different sliding velocity for 3000m of abrading distance

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