scholarly journals Influence of the Nanoclay Concentration and Oil Viscosity on the Rheological and Tribological Properties of Nanoclay-Based Ecolubricants

Lubricants ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 8
Author(s):  
Samuel D. Fernández-Silva ◽  
Moisés García-Morales ◽  
Charlène Ruffel ◽  
Miguel A. Delgado
Keyword(s):  
Continuous Phase ◽  
Oil Viscosity ◽  
Wear Scar Diameter ◽  
High Oleic Sunflower Oil ◽  
Base Oil ◽  
High Oleic ◽  
Load Carrying ◽  
Wear And Friction ◽  
Cloisite 15A ◽  
Reducing Properties

This manuscript describes a rheological and tribological study carried out on eco-friendly lubricants. These ecolubricants were made up of nanoclays as dispersed phase (a layered nanosilicate (montmorillonite Cloisite 15A) and a fiber-like nanoclay (sepiolite Pangel B20)) and vegetable-based oil as continuous phase (castor oil (CO), high oleic sunflower oil (HOSO) and their mixtures). A series of nanoclay-based ecolubricants were prepared by varying both nanoclay concentration and base oil, and thus, its viscosity. Friction and wear behaviors were assessed by using a ball-on-three plates tribometer cell. The results showed that the fiber-like sepiolite Pangel B20 yielded an important reduction in the wear scar diameter, thus revealing its potential as anti-wear and load-carrying additive in ecolubricant formulations, while Cloisite 15A proved to have friction improving properties. These anti-wear and friction reducing properties were found to be influenced by both nanoclay concentration and oil viscosity.

scholarly journals Rheological and Tribological Properties of Nanocellulose-Based Ecolubricants

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2987
Author(s):  
Samuel D. Fernández-Silva ◽  
Miguel A. Delgado ◽  
Claudia Roman ◽  
Moisés García-Morales
Keyword(s):  
Castor Oil ◽  
Oil Composition ◽  
Wear Properties ◽  
Wear Scar Diameter ◽  
High Oleic Sunflower Oil ◽  
Base Oil ◽  
High Oleic ◽  
Lubrication Regimes ◽  
Polar Components ◽  
Rich Mixtures

Based on the response surface methodology, a rheological and tribological study carried out on eco-friendly lubricants is described. Such ecolubricants consisted of fibrillated or crystalline nanocellulose in vegetable oil (castor oil, high oleic sunflower oil or their mixtures). Cellulose nanoparticles showed noticeable friction-reducing and anti-wear properties within the boundary and mixed lubrication regimes, which were found to be dependent on nanocellulose concentration, base oil composition and applied normal force. In general, both types of nanocellulose performed equally well. An excellent tribological performance, with large wear scar diameter reductions, was achieved with 3.3 wt.% (or higher) nanocellulose dispersions in castor oil-rich mixtures. The observed behavior was explained on the basis of enhanced viscosity of castor oil-rich suspensions and the preferential action of the most polar components, nanocellulose and ricinoleic acid, in the vicinity of the contact surfaces.

The Effect of Lubricant Chemistry on Wear and Scuffing of Coated Surfaces

2003 ◽  
Author(s):  
K. Cheenkachorn ◽  
J. M. Perez ◽  
O. O. Ajayi ◽  
G. R. Fenske
Keyword(s):  
Sunflower Oil ◽  
Corn Oil ◽  
Wear Test ◽  
Severity Index ◽  
Optical Microscope ◽  
Wear Properties ◽  
High Oleic Sunflower Oil ◽  
Base Oil ◽  
High Oleic ◽  
Coated Surfaces

This study focuses on the effect of lubricant chemistry on wear and scuffing of coated surfaces. The coated surfaces in the present work include TiAlN, TiN, and CrN in the presence of different lubricants including high-oleic sunflower oil, high-oleic corn oil, fully-formulated sunflower oil, fully-formulated corn oil, and a synthetic base oil. The tests are conducted using the four-ball wear test to study the wear and scuffing properties. The scanning electron microscope (SEM) and optical microscope with MicroXAMR are used to study the wear mechanism. The study shows that coatings do not affect the friction coefficient at severe test conditions. However, some coatings, TiN and CrN, improve the wear properties even in base fluids without additives. All coatings improve the scuffing properties and increase the contact severity index. The vegetable-based lubricants perform comparably to commercially available synthetic lubricants.

scholarly journals Impact of Fuel Contents on Tribological Performance of PAO Base Oil and ZDDP

Lubricants ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 79 ◽  
Author(s):  
Yan Zhou ◽  
Weimin Li ◽  
Benjamin Stump ◽  
Raynella Connatser ◽  
Sladjan Lazarevic ◽  
...  
Keyword(s):  
Wear Rate ◽  
Carrying Capacity ◽  
Acid Number ◽  
Load Carrying Capacity ◽  
Oil Viscosity ◽  
Total Acid ◽  
Base Oil ◽  
Fuel Concentration ◽  
Load Carrying ◽  
The Impact

Fuel and water contents are inevitable in automotive engine oils. This study intends to investigate the impact of the addition of gasoline (3–20%) and water (1%) on the lubricating performance of synthetic base oil (PAO), with or without an anti-wear additive (ZDDP), for a steel-cast iron contact. Fuel-added PAO showed an increase in the load carrying capacity. Oil electrical conductivity and total acid number (TAN) measurements showed slightly increased conductivity and marginally increased acidity at a higher fuel concentration. In contrast, an increased wear rate, proportional to the fuel concentration, was observed in a prolonged test with constant-loading. Results suggested that the fuel addition is a double-edged sword: reducing the scuffing risk by providing stronger surface adsorption and increasing the sliding wear rate by bringing down the oil viscosity. The PAO-water blend formed an emulsion and resulted in a significantly increased load-carrying capacity, again likely due to the higher polarity and possibly acidity. For the ZDDP-containing PAO, the addition of 1% water and 3% fuel generated 24% and 52% higher wear. The phosphate polymerization level was reduced on the worn surfaces by the introduction of water but the thickness of ZDDP tribofilm was not significantly affected.

Experimental Research on Tribological Properties of Mn0.78Zn0.22Fe2O4 Magnetic Fluids

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Wang Li-jun ◽  
Guo Chu-wen ◽  
Ryuichiro Yamane
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Chemical Properties ◽  
Friction Reduction ◽  
Experimental Investigations ◽  
Wear Scar Diameter ◽  
Base Oil ◽  
Turbine Oil ◽  
Physical And Chemical ◽  
And Chemical Properties

The synthesis and application of nanometer-sized particles have received considerable attention in recent years because of their different physical and chemical properties from those of the bulk materials or individual molecules; however, few experimental investigations on the tribological properties of lubricating oils with and without nanoferromagnetic particles have been performed. This work investigates the tribological properties of Mn0.78Zn0.22Fe2O4 nanoferromagnetic as additive in 46# turbine oil using a four-ball friction and wear tester. It is shown that the 46# turbine oil containing Mn0.78Zn0.22Fe2O4 nanoparticles has much better friction reduction and antiwear abilities than the base oil. The 46# turbine oil doped with 6wt%Mn0.78Zn0.22Fe2O4 nanoparticles show the best tribological properties among the tested oil samples, and PB value is increased by 26%, and the decreasing percentage of wear scar diameter is 25.45% compared to base oil.

Effects of Grease Types on Vibration and Acoustic Emission of Defective Linear-Guideway Type Recirculating Ball Bearings

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Hiroyuki Ohta ◽  
Shinya Hayashi ◽  
Soichiro Kato ◽  
Yutaka Igarashi
Keyword(s):  
Experimental Results ◽  
Ball Bearings ◽  
Oil Viscosity ◽  
Ball Impact ◽  
Artificial Defect ◽  
Base Oil ◽  
Impact Tests ◽  
Impact Forces ◽  
The Impact ◽  
Defect Angle

This paper deals with effects of grease types on vibrations and acoustic emissions (AEs) of linear-guideway type recirculating ball bearings with a millimeter-sized artificial defect in the carriage. First, the vibration and AE of one normal bearing without a defect (Type N) and six defective bearings (Types D1–D6) were measured using a linear velocity of 1 m/s. Three types of grease are used for the lubrication of test bearings. The experimental results show that the vibration and AE amplitudes (the pulse amplitudes, the root-mean-square (RMS) values, and component amplitudes in the spectra) of both the normal and defective bearings have a tendency to be reduced when a grease with higher base oil viscosity is used. Under the same type of grease, the RMS values of the vibrations and AE of the defective bearings increase as the defect angle increases. However, the increases of the RMS values due to increased defect angle (the increasing rates of the RMS values) are reduced when a grease with higher base oil viscosity is used. To explain these experimental results, grease impact tests are carried out. The grease impact tests show that a grease with higher base oil viscosity reduces the impact velocity and the maximum impact forces. This implies that a grease with higher base oil viscosity generate greater viscous resistance to balls in the test bearings then reduces the ball impact forces in the ball circulation collisions and ball-defect collisions. Because of the reduction of the ball impact forces, both the vibration and AE amplitudes as well as the increasing rate of the RMS values are reduced.

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