scholarly journals The Performance of SiO2 and TiO2 Nanoparticles as Lubricant Additives in Sunflower Oil

Lubricants ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 10 ◽  
Author(s):  
Vicente Cortes ◽  
Karen Sanchez ◽  
Ramiro Gonzalez ◽  
Mataz Alcoutlabi ◽  
Javier A. Ortega
Keyword(s):  
Silicon Dioxide ◽  
Tio2 Nanoparticles ◽  
Sunflower Oil ◽  
Parallel Plate ◽  
Lubricant Additives ◽  
Experimental Results ◽  
Wear Protection ◽  
The Coefficient Of Friction ◽  
Conventional Models ◽  
Biodegradable Lubricant

In recent years, there has been growing concern regarding the use of petroleum-based lubricants. This concern has generated interest in readily biodegradable fluids such as vegetable oils. The present work evaluated the rheological and tribological characteristics of sunflower oil modified with silicon dioxide (SiO2) and titanium dioxide (TiO2) nanoparticles as lubricant additives at different concentrations. A parallel plate rheometer was used to evaluate the effects of concentration and shear rate on the shear viscosity, and the experimental data was compared with conventional models. The wear protection and friction characteristics of the oil-formulations were evaluated by conducting block-on-ring sliding tests. Surface analysis-based instruments, including scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and profilometry, were used to characterize the morphology and structure of the worn surfaces. The experimental results showed that the coefficient of friction decreased with the addition of SiO2 and TiO2 nanoparticles by 77.7% and 93.7%, respectively when compared to base sunflower oil. Furthermore, the volume loss was lowered by 74.1% and 70.1%, with the addition of SiO2 and TiO2 nanoparticles, respectively. Based on the experimental results, the authors conclude that modified sunflower oil enhanced with nanoparticles has the potential for use as a good biodegradable lubricant.

scholarly journals The tribological properties of lubricating greases produced on vegetable base and modified of polytetrafluoroethylene

2020 ◽  
Vol 37 (1−2) ◽  
Author(s):  
Rafal Kozdrach
Keyword(s):  
Correlation Function ◽  
Fatigue Life ◽  
Rheological Properties ◽  
Coefficient Of Friction ◽  
Sunflower Oil ◽  
Test Results ◽  
Wear Protection ◽  
The Coefficient Of Friction ◽  
Load Conditions ◽  
Modifying Additive

The article presents the results of research on the influence of polytetrafluoroethylene additive on the tribological and rheological properties of selected lubricant compositions. Based on the obtained test results, it was found that the introduction of a modifying additive to the lubricant structure allows a significant reduction of the coefficient of friction, thus increasing the efficiency of tribological protection of the tribosystem. All lubricating compositions modified with at least 1% polytetrafluoroethylene guarantee effective anti-wear protection under load conditions of the tribosystem. Modification of the tested lubricating compositions with the applied additive affects the increase of indicators characterizing the fatigue life of the examined lubricating greases based on sunflower oil. The introduction of the polytetrafluoroethylene into the structure of the tested lubricants changed the values of the MSD correlation function and the G’ and G’’ modules, which significantly influenced the internal structure of the tested lubricant compositions.

Currents induced in a model of a rat exposed to EMP in a parallel-plate line: Calculations and experimental results

1992 ◽  
Vol 13 (5) ◽  
pp. 439-443 ◽  
Author(s):  
Ben-Qing Gao ◽  
Om P. Gandhi ◽  
Satnam Mathur ◽  
Frank Bates ◽  
Howard Bassen
Keyword(s):  
Parallel Plate ◽  
Experimental Results

Experimental Verification of Rarefied Gas Squeezed-Film Damping Models Used in MEMS

2006 ◽  
Author(s):  
Lukas Mol ◽  
Luis A. Rocha ◽  
Edmond Cretu ◽  
Reinoud F. Wolffenbuttel
Keyword(s):  
Experimental Verification ◽  
Parallel Plate ◽  
Rarefied Gas ◽  
Experimental Results ◽  
Squeeze Film ◽  
Border Effects ◽  
Knudsen Numbers ◽  
Electrostatic Mems ◽  
Simulation Errors

Existing compact parallel-plate squeeze-film models including rarefaction and border effects are verified using the experimental results of a new electrostatic MEMS actuation technique that enables full gap positioning. Measurements at high Knudsen numbers ranging from 0.03 to 0.18 are performed and results compared to the models. The simulation errors are confirmed to be lower than 20%. The experiments also indicate that both gas rarefaction and border effects have to be included in any model.

TRIBOLOGICAL AND THERMOPHYSICAL PROPERTIES OF JATROPHA OIL CONTAINING TIO2 NANOPARTICLES

2020 ◽  
Author(s):  
Rajaganapathy C ◽  
Vasudevan D
Keyword(s):  
Tio2 Nanoparticles ◽  
Friction Reduction ◽  
Engine Oil ◽  
Material Surface ◽  
Wear Properties ◽  
Weight Percentage ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Wire Method ◽  
Surface Examination

In this paper, an attempt was made, to evaluate the tribological performance of Jatropa oil with addition of nanoparticles, on wear reduction in Al 6082 and it was compared with SAE20W40 engine oil. Experiments were conducted with pure Jatropa oil with different weight percentage of TiO2 nanoparticles such as 0%, 0.1%, 0.3% and 0.5%. The coefficient of friction and specific wear rate of the Al specimens were found by using pin on disc tribo-meter as per ASTM G99 standards, at constant speed of 1m/s using different loads such as 20N, 40N and 60N. The experimental results indicated that the addition of TiO2 with Jatropa oil indicated good friction reduction and anti-wear properties, compared to SAE20W40 engine oil. The lubricant viscosity and thermal conductivity were measured using Redwood viscometer and Transient hot wire method. Surface analysis was done using scanning electron microscopy to the study surface morphology of pin material. Surface examination revealed that TiO2 Nanoparticles lead to smoother worn surfaces than commercial Engine oil SAE20W40.

Study on the Friction and Wear Characteristics of Tungsten Carbide and Zirconium With Phosphor-Containing Liquid

2016 ◽  
Vol 139 (3) ◽  
Author(s):  
Myeong-Woo Ha ◽  
Kwang-Hee Lee ◽  
Chul-Hee Lee ◽  
Jong-Myung Choi ◽  
Jun-Wook An
Keyword(s):  
Tungsten Carbide ◽  
Coefficient Of Friction ◽  
Contact Surface ◽  
Friction And Wear ◽  
Yttrium Aluminum Garnet ◽  
Experimental Results ◽  
Wear Characteristics ◽  
Hard Materials ◽  
The Coefficient Of Friction ◽  
Friction And Wear Characteristics

The dispenser ejects the ceramic filler and phosphor-containing liquid for making various products. When the particle-containing liquid is ejected under high-velocity conditions, however, the ejection reliability decreases because of the wear of the contact surface between the rod and nozzle even though these components are made of hard materials. It is therefore necessary to characterize the friction and wear properties of the hard materials, tungsten carbide (WC) and zirconium (Zr), with the high-viscosity liquid-containing nitride or yttrium aluminum garnet (YAG) particles under reciprocating conditions. Particle contents of 15 wt.% and 30 wt.% are added to the liquid. A reciprocating test was implemented to this end, and WC and Zr specimens were used. The liquid used in the experiment contains nitride and YAG. The experimental results show that the particles inside the liquid are worn out, leading to particle lubrication and the decrease in the coefficient of friction. Also, it is confirmed that the more the particles are, the less the coefficient of friction is due to particle lubrication. For each experimental condition, the coefficient of friction is measured and compared. Moreover, the contact surface of the specimen is analyzed using an electron microscope, and a profilometer is used to measure the surface roughness of the specimen before and after the test. The reciprocation friction and wear characteristics of WC and Zr with phosphor-containing liquid are evaluated by analyzing the experimental results.

scholarly journals Electrospray Nanocoating of Microfibres

2008 ◽  
Vol 140 ◽  
pp. 127-132 ◽  
Author(s):  
A. Jaworek ◽  
A. Krupa ◽  
A.T. Sobczyk ◽  
M. Lackowski ◽  
T. Czech ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Surface Area ◽  
Collection Efficiency ◽  
Total Surface Area ◽  
Experimental Results ◽  
Nanometer Scale ◽  
Electrospray Deposition ◽  
Fibrous Filters ◽  
Catalytic Material

The paper presents experimental results of electrospray deposition of nanopowder onto microfibers. The process is designed to form fibrous filters with an enhanced collection efficiency in the submicron range by covering the fabric with a catalytic material. Polyamide fibres were coated with Al2O3, ZnO, MgO, or TiO2 nanoparticles. The structures obtained were porous at the nanometer scale which increased the total surface area of the catalyst.

On the Mechanics of Wire Drawing

1961 ◽  
Vol 83 (4) ◽  
pp. 523-529 ◽  
Author(s):  
C. T. Yang
Keyword(s):  
Theoretical Analysis ◽  
Shear Deformation ◽  
Coefficient Of Friction ◽  
Close Agreement ◽  
Wire Drawing ◽  
Experimental Results ◽  
Strain Gages ◽  
Drawing Force ◽  
The Coefficient Of Friction ◽  
Wire Resistance

Split-die technique was adopted to find the coefficient of friction in wire drawing directly from experiment. Simple dynamometers with wire resistance strain gages were used for measuring separating force and drawing force instead of cumbersome equipment used by former researchers. Reasonably good results were obtained. The effect of the land or parallel portion in the die on the coefficient of friction was indicated in the results. Its importance was emphasized. A theoretical equation of the drawing stress with the effect of land considered was derived. Using the coefficient of friction obtained by the split-die method, drawing stresses were calculated from the derived equation. A comparison of the theoretical and experimental drawing stresses was made. Results were tabulated and plotted. It was concluded that including the land in the analysis of wire drawing is important and further research in analyzing the shear deformation must be pursued in order to get a close agreement between theoretical analysis and experimental results.

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