The synthesis of nanocarbon-poly(ricinoleic acid) composite as a lubricant additive with improved dispersity and anti-wear properties

AbstractBlack phosphorus quantum dots (BPQDs), obtained via a typical solution-based top-down method, were used as water-based lubricant additives. BPQDs exhibited remarkable friction reduction and anti-wear properties even at the ultra-low concentration of 0.005 wt%, which reduced the friction coefficient and wear volume of the base liquid by 32.3% and 56.4%, respectively. In addition, the load-supporting capacity of the base liquid increased from 120 N to over 300 N. BPQDs-based additives exhibited a relatively long lifetime at a relatively high load of 80 N. The performance of BPQDs considerably exceeded that of the BP; this may be attributed to their small and uniform particle size, good dispersion stability in water, and high reactivity at the frictional surfaces. The results of the surface wear resistance analysis demonstrated that a robust tribochemical film with a thickness of approximately 90 nm was formed on the rubbing surface lubricated with 0.005 wt% of BPQDs dispersion. Moreover, the film served as a direct evidence of the excellent tribological performance of BPQDs.

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Tribological performance of commercial Mobil grade lubricants operating with titanium dioxide nanoparticle additives

Industrial Lubrication and Tribology ◽

10.1108/ilt-04-2018-0147 ◽

2019 ◽

Vol 71 (2) ◽

pp. 188-198 ◽

Cited By ~ 1

Author(s):

Shubham Rajendra Suryawanshi ◽

Jayant T. Pattiwar

Keyword(s):

Titanium Dioxide ◽

Titanium Dioxide Nanoparticles ◽

Frictional Coefficient ◽

Lubricant Additive ◽

Tribological Performance ◽

Operating Conditions ◽

Asperity Contact ◽

Wear Properties ◽

Tribochemical Reaction ◽

Content Type

Purpose The purpose of this study is to investigate the tribological performance (anti-friction and anti-wear properties) of commercial Mobil grade lubricants used in a journal bearing system in a power plant. Design/methodology/approach Three grades of Mobil lubricants (DTE 24, DTE 25 and DTE 26) are considered during the study. Titanium dioxide nanoparticles (TiO2, 0.5 Wt.%) of size 40 nm are used as a lubricant additive to examine the performance of the lubricants. The viscosity of the lubricant is computed using modified Krieger–Dougherty viscosity model. The morphology of TiO2 nanoparticles is studied with the help of scanning electron microscopy, ultra violet spectrophotometer and X-ray diffraction. The study of antifriction and antiwear properties for lubricants is carried out on four-ball tribo-tester for operating conditions specified by ASTM standards. Findings The tribochemical reaction film is formed between ball surfaces during the experiments on four-ball tester that minimizes the asperity contact due to addition of TiO2 nanoparticles in the lubricant. The viscosity of the lubricant is enhanced due to the addition of TiO2 nanoparticles. The frictional coefficient and wear scar diameters of balls in the lubricants are reduced in the range of 6-26 and 2-7 per cent, respectively. Originality/value The tribological properties of TiO2 as a lubricant additive in three commercial Mobil grade lubricants are investigated in this paper. The results obtained in this paper are expected to be helpful to bearing designers, researchers and academicians concerned with the relevant study.

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Synthesis of Core–Shell Micro/Nanoparticles and Their Tribological Application: A Review

Materials ◽

10.3390/ma13204590 ◽

2020 ◽

Vol 13 (20) ◽

pp. 4590

Author(s):

Hao Chen ◽

Lin Zhang ◽

Mengyu Li ◽

Guoxin Xie

Keyword(s):

Chemical Mechanical Polishing ◽

Lubricant Additive ◽

Mechanical Polishing ◽

Core Shell ◽

Synthesis Methods ◽

Wear Properties ◽

Liquid Lubricant ◽

Reinforcing Fillers ◽

The Matrix ◽

Abrasive Surface

Owing to the diverse composition, adjustable performance, and synergistic effect among components, core–shell micro/nanoparticles have been widely applied in the field of tribology in recent years. The strong combination with the matrix and the good dispersion of reinforcing fillers in the composites could be achieved through the design of core–shell structural particles based on the reinforcing fillers. In addition, the performance of chemical mechanical polishing could be improved by optimizing the shell material coated on the abrasive surface. The physical and chemical state of the core–shell micro/nanoparticles played important effects on the friction and wear properties of materials. In this paper, the synthesis methods, the tribological applications (acted as solid/liquid lubricant additive, chemical mechanical polishing abrasives and basic units of lubricant matrix), and the functionary mechanisms of core–shell micro/nanoparticles were systematically reviewed, and the future development of core–shell micro/nanoparticles in tribology was also prospected.

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Effects of Ag-Carried Content in P/Ag Nanocomposites on Tribological Properties of 45 Mild Steel Friction Pairs

Materials Science Forum ◽

10.4028/www.scientific.net/msf.694.17 ◽

2011 ◽

Vol 694 ◽

pp. 17-22 ◽

Cited By ~ 1

Author(s):

Lǜ Yang ◽

Yi Li ◽

Yuan Kang Zhou ◽

Xue Mei Wu

Keyword(s):

Friction Coefficient ◽

Mild Steel ◽

Mass Loss ◽

Tribological Properties ◽

Silver Content ◽

Testing Machine ◽

Lubricant Additive ◽

Wear Properties ◽

Surface Topographies ◽

The One

In this paper, some Ag-carried palygorskite nanocomposites P/Ag were prepared, their silver content were 1.3%, 4.61%, 9.54% separately. To investigate the effects of the silver content on tribological properties of 45 mild steel pairs, the P/Ag carried different Ag content were used as lubricant additive and their tribological properties were tested on the MMU-10G testing machine. The wear mass loss is used to assess the anti-wear properties of different additives. The surface topographies and main elements are analyzed through SEM and EDS after running for 30 hours. The results show that the friction coefficient and the wear mass loss significantly decrease along with the increase of silver content in the P/Ag: the average friction coefficient of the P/Ag with 9.54% silver reduces about 65% as much as the one with 1.3% silver, meanwhile, the wear mass loss decreases 57% likewise. The surfaces after rubbing 30 hours, some kind of auto-restoration films that contains sort of characteristic elements such as O, Si, Mg, Al, Ag etc. are formed on the surfaces. With the help of this kind of films, the anti-wear properties of the friction pairs are finally improved. The factors that cause the improvement of anti-friction properties of the friction pairs lie in the quality and the silver content of the auto-restoration films formed on the surfaces of friction pairs.

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Influence of Multiwall Carbon Nanotube on mechanical and wear properties of Copper – Iron composite

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.17.1.2020.06.0561 ◽

2020 ◽

Vol 17 (1) ◽

pp. 7570-7576 ◽

Cited By ~ 1

Author(s):

H. Sh. Hammood ◽

S. S. Irhayyim ◽

A. Y. Awad ◽

H. A. Abdulhadi

Keyword(s):

Carbon Nanotubes ◽

Volume Fraction ◽

Hybrid Composites ◽

Hydraulic Press ◽

Dry Sliding Wear ◽

Multiwall Carbon Nanotube ◽

Wear Properties ◽

Sem Images ◽

Wear Rates ◽

Multiwall Carbon

Multiwall Carbon nanotubes (MWCNTs) are frequently attractive due to their novel physical and chemical characteristics, as well as their larger aspect ratio and higher conductivity. Therefore, MWCNTs can allow tremendous possibilities for the improvement of the necessarily unique composite materials system. The present work deals with the fabrication of Cu-Fe/CNTs hybrid composites manufactured by powder metallurgy techniques. Copper powder with 10 vol. % of iron powder and different volume fractions of Multi-Wall Carbon Nanotubes (MWCNTs) were mixed to get hybrid composites. The hybrid composites were fabricated by adding 0.3, 0.6, 0.9, and 1.2 vol.% of MWCNTs to Cu- 10% Fe mixture using a mechanical mixer. The samples were compressed under a load of 700 MPa using a hydraulic press to compact the samples. Sintering was done at 900°C for 2 h at 5ºC/min heating rate. The microscopic structure was studied using a Scanning Electron Microscope (SEM). The effect of CNTs on the mechanical and wear properties, such as micro-hardness, dry sliding wear, density, and porosity were studied in detail. The wear tests were carried out at a fixed time of 20 minutes while the applied loads were varied (5, 10, 15, and 20 N). SEM images revealed that CNTs were uniformly distributed with relative agglomeration within the Cu/Fe matrix. The results showed that the hardness, density, and wear rates decreased while the percentage of porosity increased with increasing the CNT volume fraction. Furthermore, the wear rate for all the CNTs contents increased with the applied load.

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In-Plane Bending and Shear Deformation of Belt Contributions on Tire Cornering Stiffness Characteristics

Tire Science and Technology ◽

10.2346/tire.20.190213 ◽

2020 ◽

Author(s):

Gibin Gil ◽

Sujin Lee

Keyword(s):

Mathematical Model ◽

Shear Deformation ◽

Beam Theory ◽

Slip Angle ◽

Wear Properties ◽

Angle Change ◽

Foundation Model ◽

Plane Bending ◽

Stiffness Characteristics ◽

Brush Model

ABSTRACT In radial tires, belt structure plays a role of minimizing the lateral deflection of carcass, which has a significant influence on the cornering and wear properties of a tire. The deflection of carcass affects the magnitude of tread block deformation when the tire is under the slip angle. As a result, it can change the cornering stiffness characteristics of the tire, especially when the vertical load is high. During tire development, a tire design engineer tries to find the optimal belt ply angle that satisfies the various performance requirements simultaneously, but it is not an easy task because the effect of belt angle change is different depending on the size of the tire. There have been many attempts to construct a mathematical model that represents the structural properties of the belt package, including the string-based model and the beam on elastic foundation model. But, in many cases, only the in-plane bending of belt is considered and the shear deformation is not taken into consideration. In this study, the effect of belt angle change on belt stiffness is analyzed using a mathematical model based on the Timoshenko beam theory. This model can account for the in-plane bending and shear deformation of the belt structure at the same time. The results of the analysis show how the contribution of bending and shear is changed depending on a tire design parameter, herein the belt cord angle. The effect of belt ply angle change on cornering stiffness is investigated by means of the brush model including belt flexibility. The prediction by the brush model is compared with the measurement using a Flat-trac machine, and the validity of the model is discussed.

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Effect of High Temperature on Wear Behavior of Stir Cast Aluminium/Boron Carbide Composites

Mechanics and Mechanical Engineering ◽

10.2478/mme-2018-0082 ◽

2020 ◽

Vol 22 (4) ◽

pp. 1031-1046

Author(s):

X. Canute ◽

M. C. Majumder

Keyword(s):

High Temperature ◽

Wear Rate ◽

Boron Carbide ◽

Wear Behavior ◽

Base Alloy ◽

Weight Fraction ◽

Sliding Velocity ◽

Wear Properties ◽

High Temperature Wear ◽

The Matrix

AbstractThe need for development of high temperature wear resistant composite materials with superior mechanical properties and tribological properties is increasing significantly. The high temperature wear properties of aluminium boron carbide composites was evaluated in this investigation. The effect of load, sliding velocity, temperature and reinforcement percentage on wear rate was determined by the pin heating method using pin heating arrangement. The size and structure of base alloy particles change considerably with an increase of boron carbide particles. The wettability and interface bonding between the matrix and reinforcement enhanced by the addition of potassium flurotitanate. ANOVA technique was used to study the effect of input parameters on wear rate. The investigation reveals that the load had higher significance than sliding velocity, temperature and weight fraction. The pin surface was studied with a high-resolution scanning electron microscope. Regression analysis revealed an extensive association between control parameters and response. The developed composites can be used in the production of automobile parts requiring high wear, frictional and thermal resistance.

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