scholarly journals Nanoparticles of Zn and ZnO as extreme pressure (EP) additives for lubricants

2018 ◽  
Vol 16 (5) ◽  
Author(s):  
Jose Taha Tijerina ◽  
Flavio Castillo ◽  
Javier Leal ◽  
Laura Peña Parás ◽  
Demófilo Maldonado Cortés ◽  
...  
Keyword(s):  
Automotive Industry ◽  
Metal Forming ◽  
Critical Issue ◽  
Measuring System ◽  
Zno Nanoparticle ◽  
Load Carrying Capacity ◽  
Extreme Pressure ◽  
Wear Properties ◽  
Load Carrying ◽  
Nanoparticle Additives

The tribological behavior of moving components and tooling in the automotive industry is a critical issue for improving tool life and increasing efficiency. This work discusses the effects of Zn and ZnO nanoparticle additives homogeneously dispersed within a metal-forming synthetic fluid at various filler fractions: 0.01, 0.05 and 0.10wt.%. Nanolubricants were evaluated under scuffing conditions at extreme pressures (EP) conditions using a four-ball tribotester in order to obtain the load-carrying capacity (poz) behavior, and overall tribological characteristics. This method has shown, with great precision, the influence of the nanofillers on the EP behavior of conventional lubricants. Worn surfaces were characterized through Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) to determine the tribological mechanisms of nanoparticles. An Alicona 3D surface measuring system was used for measuring the surface roughness of the wear scars. Both nanoparticles exhibited better friction-reducing and anti-wear properties compared to the base synthetic fluid. For Zn-based nanolubricants, an enhancement of ~180% in poz was obtained with 0.10wt.%, showing the effect of the spherical nanostructures that were tribosintered onto the surface due to the EPs of the test. Furthermore, the highest enhancement in poz (up to 250%) was achieved with incorporation of 0.10wt.% of ZnO demonstrating the potential of nanolubricants for improving the efficiency of mechanical components.

Extreme pressure properties of nanolubricants for metal-forming applications

2016 ◽  
Vol 68 (1) ◽  
pp. 30-34 ◽  
Author(s):  
Laura Peña-Parás ◽  
Demófilo Maldonado-Cortés ◽  
Jaime Taha-Tijerina ◽  
Patricio García-Pineda ◽  
Gerardo Tadeo Garza ◽  
...  
Keyword(s):  
Carrying Capacity ◽  
Metal Forming ◽  
Design Methodology ◽  
Load Carrying Capacity ◽  
Extreme Pressure ◽  
Synthetic Lubricant ◽  
Content Type ◽  
Load Carrying ◽  
Practical Implications ◽  
Nanoparticle Additives

Purpose – The purpose of this paper is to evaluate the extreme pressure properties of CuO and TiO2 nanoparticle additives with the incorporation of a surfactant within a synthetic fluid for metal-forming applications. Design/methodology/approach – The paper studies the effect of CuO and TiO2 nanoparticle additives at various concentrations (0.01, 0.05 and 0.10 wt. per cent) in a synthetic lubricant fluid under extreme pressure conditions. Oleic acid surfactant is added to the nanolubricant to improve dispersion and stability of nanoparticles. Extreme pressure tribological tests are performed on a four-ball T-02 tribotester according to the ITEePib Polish method for testing lubricants under conditions of scuffing. Findings – The results show that the addition CuO and TiO2 nanoparticles under the presence of OA resulted in an increase of the load-carrying capacity (poz) of the lubricant up to 137 and 60 per cent, respectively. The seizure load was also increased by 50 and 15 per cent, respectively. Practical implications – The results show that CuO and TiO2 nanoparticles can be successfully used as additives improving extreme pressure properties of lubricants. Originality/value – This demonstrates the potential of nanoparticle additives using surfactants for improving the extreme pressure properties of lubricants. These nanolubricants can be used for metal-forming applications like deep-drawing, achieving an increased tool life.

Temperature dependence of the extreme-pressure behavior of CuO and TiO2 nanoparticle additives in metal-forming polymeric lubricants

2017 ◽  
Vol 69 (5) ◽  
pp. 730-737 ◽  
Author(s):  
Laura Peña-Parás ◽  
Patricio García-Pineda ◽  
Demófilo Maldonado-Cortés ◽  
Gerardo Tadeo Garza ◽  
Jaime Taha-Tijerina
Keyword(s):  
Carrying Capacity ◽  
Metal Forming ◽  
Energy Dispersive Spectrometry ◽  
Effect Of Temperature ◽  
Load Carrying Capacity ◽  
Extreme Pressure ◽  
Content Type ◽  
Load Carrying ◽  
Practical Implications ◽  
Nanoparticle Additives

Purpose The purpose of this work is to investigate the effect of temperature on the extreme-pressure (EP) properties of CuO and TiO2 nanoparticle-filled polymeric lubricants for metal-forming processes. Design/methodology/approach This paper studies the effect of nanoparticle additives of CuO and TiO2 on the load-carrying capacity of a metal-forming polymer lubricant used for deep-drawing at varying temperatures. EP measurements are performed with a four-ball tribotester according to the ITeE-PIB Polish method for testing lubricants under scuffing conditions. Tests are run at 25, 40, 60 and 75°C to further decrease the lubricant film thickness and determine the effect on the load-carrying capacity and the tribological mechanisms of nanoparticles. The tribological mechanisms of nanoparticles is studied using energy dispersive spectrometry (EDS). Findings Results indicate that nanoparticle additives increase the load-carrying capacity of the polymeric lubricant at all concentrations up to 60°C attributed to a mending effect and a reduction in the area of contact of moving surfaces; at 75°C, the improvement is lowered due to nanoparticle re-agglomeration. The best results are found with TiO2 nanoparticles due to their smaller size compared to CuO. Practical implications Nanoparticles of CuO and TiO2 are potential EP additives for metal-forming lubricants, providing protection to working components and extending tool life. Originality/value These results show the effectiveness and the tribological mechanisms of nanoparticle additives under EP conditions and increasing temperatures found in metal-forming processes.

scholarly journals Performance of Additives Concerning Synergistic Effect in Lube Oil

2020 ◽  
Vol 9 (3) ◽  
pp. 1874-1878 ◽  
Keyword(s):  
Synergistic Effect ◽  
Wear Scar ◽  
Load Carrying Capacity ◽  
Extreme Pressure ◽  
Wear Properties ◽  
Wear Scar Diameter ◽  
Lubricating Oils ◽  
Effect Of Additives ◽  
Reducing Ability ◽  
Load Carrying

Lubricating oils containing ester, gaining more importance due to their friction reducing ability. Screening the performance of lubricating oils prior to field test is of most significance for the new lubricant formulations. In this endeavor, six lubricating blends were formulated having variable concentration of additives (sulfur and ester) in mineral oil and screened for their performance using four-ball tribo-tester. The formulated blends were evaluated for their extreme pressure and anti-wear characteristics as per ASTM standards. Tests were conducted on DUCOM TR- 30L four-ball tester and wear scar diameter were measured on an optical microscope.Compatibility and synergy of additives have been discussed on the basis of various parameters such as anti-wear scar diameter, mean scar diameter (just below weld load), mean scar diameter (at last non-seizure load), weld load and load wear index. The findings of this study demonstrate that ester along-with sulfur not only boost anti-wear properties but also enhance load carrying capacity of oil. An addition of sulfur beyond 2 % may not yield any significant improvement of tribo-characteristics of these oils.This paper is highlighting the synergistic effect of additives to render it as suitable lubricant for metal working applications. This paper also suggested an optimum concentration of an additive for its suitability for anti-wear and/(or) extreme-pressure properties.

scholarly journals Improving the lubrication and anti-corrosion performance of polyurea grease via ingredient optimization

Friction ◽  
2020 ◽  
Author(s):  
Guanlin Ren ◽  
Xiaowen Sun ◽  
Wen Li ◽  
Hao Li ◽  
Lin Zhang ◽  
...  
Keyword(s):  
Performance Characteristics ◽  
Friction Reduction ◽  
Chemical Components ◽  
Load Carrying Capacity ◽  
Wear Properties ◽  
Base Oil ◽  
Lubrication Film ◽  
Load Carrying ◽  
Polyurea Grease ◽  
Organic Amines

Abstract Thickener formulation plays a significant role in the performance characteristics of grease. The polyurea greases (PUGs) were synthesized using mineral oil (500SN) as the base oil, and by regulating the reaction of diphenylmethane diisocyanate (MDI) and different organic amines. The as-prepared PUGs from the reaction of MDI and cyclohexylamine/p-toluidine exhibit the optimum physicochemical and friction-wear properties, confirming that the regulation of thickener formulation can improve the performance characteristics of grease, including friction reduction, wear, corrosion resistance, and load-carrying capacity. The anticorrosion and lubrication properties of as-prepared PUGs depend on good sealing functions and a boundary lubrication film (synergy of grease-film and tribo-chemical reaction film), as well as their chemical components and structure.

scholarly journals Study on the anti-wear properties of metal-forming lubricants with TiO2 and CuO nanoparticle additives

2018 ◽  
Vol 400 ◽  
pp. 062022 ◽  
Author(s):  
L Pena-Paras ◽  
J Gutiérrez ◽  
M Irigoyen ◽  
M Lozano ◽  
M Velarde ◽  
...  
Keyword(s):  
Metal Forming ◽  
Wear Properties ◽  
Cuo Nanoparticle ◽  
Nanoparticle Additives

Effect of Nanoparticle Additives on Journal Bearing Lubricated with Non-Newtonian Carreau Fluid

2015 ◽  
Vol 751 ◽  
pp. 137-142 ◽  
Author(s):  
W. Gunnuang ◽  
C. Aiumpornsin ◽  
Mongkol Mongkolwongrojn
Keyword(s):  
Carrying Capacity ◽  
Reynolds Equation ◽  
Energy Equation ◽  
Journal Bearing ◽  
Research Work ◽  
Load Carrying Capacity ◽  
Static Characteristics ◽  
Carreau Fluid ◽  
Load Carrying ◽  
Nanoparticle Additives

This research work presents the influence of Al2O3 nanoparticle additives on the performance characteristics of a journal bearing. Non-Newtonian fluid based on Carreau viscosity model was represented for SAE10W50 oil blended with Al2O3 nanoparticles in this work. Reynolds equation and energy equation have been formulated and solved numerically using finite difference method and multigrid multilevel techniques with boundary conditions. The static characteristics of the journal bearing under isothermal and adiabatic conditions were examined. The results show that the addition of Al2O3 nanoparticles improve load-carrying capacity of the journal but almost no change on film temperature due to good thermal property of Al2O3 nanoparticles.

Preparation and Tribological of 8-Hydroxyquinolinato Cerium

2012 ◽  
Vol 616-618 ◽  
pp. 1836-1840
Author(s):  
Ye Yu Lu ◽  
Xiao Feng Jiang ◽  
Lin Yu
Keyword(s):  
Aqueous Solution ◽  
Carrying Capacity ◽  
Element Distribution ◽  
Load Carrying Capacity ◽  
Frictional Surface ◽  
Extreme Pressure ◽  
Paraffin Oil ◽  
Load Carrying ◽  
Ethanol Aqueous Solution ◽  
Scar Width

A new solid cerium complex, was synthesized by 8-hydroxyquinoline and cerium nitrate in the ethanol-aqueous solution. The complex was characterized by elemental analysis and FTIR. The results indicate that the complex is Ce(C9H6NO)3. The tribological properties of the Ce(C9H6NO)3particles as additive in paraffin oil was investigatedon MRS-10A four-ball tester, the results indicate that Ce(C9H6NO)3particles as additive can be effective in improving anti-wear ability, in enhancing extreme-pressure capacity. The wear scar width can be decreased 0.3mm when the additive in paraffin oil is about 0.25wt.%, when the additive in paraffin oil is about 0.5wt.%, load-carrying capacity can improve 29%. The morphologies, typical element distribution of the worn surfaces were characterized by SEM and EDS, respectively. Its anti-wear mechanism as follows: A permeating layer with rare earth elements was produced in the frictional sub-surface, the layer modified the microstructure and the lubricating state of the frictional surface.

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