Experimental evaluation of the tribological behaviour of CeO2 nanolubricants under extreme pressures

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Lubrication of moving components is critical for lowering friction and reducing energy consumption. Nanoparticles have been recently studied as additives for improving the load-carrying capacity and overall tribological performance of lubricants employed for metal-mechanic applications. Cerium oxide is a lanthanide metal oxide (rare earth) with environmentally friendly characteristics that is widely used for consumer products, and most recently for enhancing the tribological performance of composite materials and lubricants. In this work, formulated polymeric lubricants employed for metal forming processes with dispersed cerium oxide (CeO2) nanoparticles were characterized under extreme pressure (EP) conditions. Nanoparticle concentrations of 0.01, 0.05, and 0.10 wt.% were dispersed by homogenization and ultrasonication in the selected lubricant. Tribological characterization under EP was performed with a T-02 four-ball tribometer according to the ITeE-PIB Polish method for testing lubricants under conditions of scuffing. This method applies and increasing load of 0-7200 N to the tribopair in a very short amount of time (18s) and is employed to find the maximum pressure a lubricant film can withstand. The scuffing load (P t), and pressure loss limit or load carrying capacity (poz ) were determined after each test. Wear scar diameters (WSDs) of worn ball materials were measured with an Alicona optical 3D measurement system. The anti-wear (AW) and friction-reducing characteristics of CeO2 nanolubricants were determined with a T-05 block-on-ring test. No seizure was found for all lubricants likely due to the presence of additives in the polymeric lubricant. Nanoparticles were found to delay scuffing initiation at concentrations up to 0.05 wt.%, and the load required for scuffing increased by 35 %. The load-carrying capacity was enhanced by up to 84% with only 0.01 wt.% CeO2. Higher concentrations (0.10 wt.%) had a detrimental effect, most likely due to nanoparticle agglomeration. The coefficient of friction (COF) was lowered from 0.035 for the polymeric lubricant to 0.006 with a concentration of 0.01 wt.% CeO2.The tribological results obtained by both tests demonstrate that CeO2 nanoparticles have friction-reducing and EP characteristics, making them suitable as lubricant additives in the metal-mechanic industry.

Original languageEnglish
Title of host publicationIOP Conference Series: Materials Science and Engineering
PublisherInstitute of Physics Publishing
Volume400
Edition7
DOIs
Publication statusPublished - 20 Sep 2018
Event6th International Conference on Modern Technologies in Industrial Engineering, ModTech 2018 - Constanta, Romania
Duration: 13 Jun 201816 Jun 2018

Publication series

NameIOP Conference Series: Materials Science and Engineering
PublisherIOP Publishing Ltd.
ISSN (Print)1757-8981

Conference

Conference6th International Conference on Modern Technologies in Industrial Engineering, ModTech 2018
CountryRomania
CityConstanta
Period13/6/1816/6/18

Fingerprint

Lubricants
Nanoparticles
Load limits
Friction
Metals
Cerium
Oxides
Mechanics
Wear of materials
Lanthanoid Series Elements
Consumer products
Metal forming
Rare earth elements
Rare earths
Lubrication
Energy utilization
Agglomeration
Composite materials
Testing

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

Cite this

Pena-Paras, L., Maldonado-Cortes, D., Taha-Tijerina, J., Irigoyen, M., & Guerra, J. (2018). Experimental evaluation of the tribological behaviour of CeO2 nanolubricants under extreme pressures. In IOP Conference Series: Materials Science and Engineering (7 ed., Vol. 400). [072003] (IOP Conference Series: Materials Science and Engineering). Institute of Physics Publishing. https://doi.org/10.1088/1757-899X/400/7/072003
Pena-Paras, L. ; Maldonado-Cortes, D. ; Taha-Tijerina, J. ; Irigoyen, M. ; Guerra, J. / Experimental evaluation of the tribological behaviour of CeO2 nanolubricants under extreme pressures. IOP Conference Series: Materials Science and Engineering. Vol. 400 7. ed. Institute of Physics Publishing, 2018. (IOP Conference Series: Materials Science and Engineering).
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abstract = "Lubrication of moving components is critical for lowering friction and reducing energy consumption. Nanoparticles have been recently studied as additives for improving the load-carrying capacity and overall tribological performance of lubricants employed for metal-mechanic applications. Cerium oxide is a lanthanide metal oxide (rare earth) with environmentally friendly characteristics that is widely used for consumer products, and most recently for enhancing the tribological performance of composite materials and lubricants. In this work, formulated polymeric lubricants employed for metal forming processes with dispersed cerium oxide (CeO2) nanoparticles were characterized under extreme pressure (EP) conditions. Nanoparticle concentrations of 0.01, 0.05, and 0.10 wt.{\%} were dispersed by homogenization and ultrasonication in the selected lubricant. Tribological characterization under EP was performed with a T-02 four-ball tribometer according to the ITeE-PIB Polish method for testing lubricants under conditions of scuffing. This method applies and increasing load of 0-7200 N to the tribopair in a very short amount of time (18s) and is employed to find the maximum pressure a lubricant film can withstand. The scuffing load (P t), and pressure loss limit or load carrying capacity (poz ) were determined after each test. Wear scar diameters (WSDs) of worn ball materials were measured with an Alicona optical 3D measurement system. The anti-wear (AW) and friction-reducing characteristics of CeO2 nanolubricants were determined with a T-05 block-on-ring test. No seizure was found for all lubricants likely due to the presence of additives in the polymeric lubricant. Nanoparticles were found to delay scuffing initiation at concentrations up to 0.05 wt.{\%}, and the load required for scuffing increased by 35 {\%}. The load-carrying capacity was enhanced by up to 84{\%} with only 0.01 wt.{\%} CeO2. Higher concentrations (0.10 wt.{\%}) had a detrimental effect, most likely due to nanoparticle agglomeration. The coefficient of friction (COF) was lowered from 0.035 for the polymeric lubricant to 0.006 with a concentration of 0.01 wt.{\%} CeO2.The tribological results obtained by both tests demonstrate that CeO2 nanoparticles have friction-reducing and EP characteristics, making them suitable as lubricant additives in the metal-mechanic industry.",
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Pena-Paras, L, Maldonado-Cortes, D, Taha-Tijerina, J, Irigoyen, M & Guerra, J 2018, Experimental evaluation of the tribological behaviour of CeO2 nanolubricants under extreme pressures. in IOP Conference Series: Materials Science and Engineering. 7 edn, vol. 400, 072003, IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing, 6th International Conference on Modern Technologies in Industrial Engineering, ModTech 2018, Constanta, Romania, 13/6/18. https://doi.org/10.1088/1757-899X/400/7/072003

Experimental evaluation of the tribological behaviour of CeO2 nanolubricants under extreme pressures. / Pena-Paras, L.; Maldonado-Cortes, D.; Taha-Tijerina, J.; Irigoyen, M.; Guerra, J.

IOP Conference Series: Materials Science and Engineering. Vol. 400 7. ed. Institute of Physics Publishing, 2018. 072003 (IOP Conference Series: Materials Science and Engineering).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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T1 - Experimental evaluation of the tribological behaviour of CeO2 nanolubricants under extreme pressures

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AU - Maldonado-Cortes, D.

AU - Taha-Tijerina, J.

AU - Irigoyen, M.

AU - Guerra, J.

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N2 - Lubrication of moving components is critical for lowering friction and reducing energy consumption. Nanoparticles have been recently studied as additives for improving the load-carrying capacity and overall tribological performance of lubricants employed for metal-mechanic applications. Cerium oxide is a lanthanide metal oxide (rare earth) with environmentally friendly characteristics that is widely used for consumer products, and most recently for enhancing the tribological performance of composite materials and lubricants. In this work, formulated polymeric lubricants employed for metal forming processes with dispersed cerium oxide (CeO2) nanoparticles were characterized under extreme pressure (EP) conditions. Nanoparticle concentrations of 0.01, 0.05, and 0.10 wt.% were dispersed by homogenization and ultrasonication in the selected lubricant. Tribological characterization under EP was performed with a T-02 four-ball tribometer according to the ITeE-PIB Polish method for testing lubricants under conditions of scuffing. This method applies and increasing load of 0-7200 N to the tribopair in a very short amount of time (18s) and is employed to find the maximum pressure a lubricant film can withstand. The scuffing load (P t), and pressure loss limit or load carrying capacity (poz ) were determined after each test. Wear scar diameters (WSDs) of worn ball materials were measured with an Alicona optical 3D measurement system. The anti-wear (AW) and friction-reducing characteristics of CeO2 nanolubricants were determined with a T-05 block-on-ring test. No seizure was found for all lubricants likely due to the presence of additives in the polymeric lubricant. Nanoparticles were found to delay scuffing initiation at concentrations up to 0.05 wt.%, and the load required for scuffing increased by 35 %. The load-carrying capacity was enhanced by up to 84% with only 0.01 wt.% CeO2. Higher concentrations (0.10 wt.%) had a detrimental effect, most likely due to nanoparticle agglomeration. The coefficient of friction (COF) was lowered from 0.035 for the polymeric lubricant to 0.006 with a concentration of 0.01 wt.% CeO2.The tribological results obtained by both tests demonstrate that CeO2 nanoparticles have friction-reducing and EP characteristics, making them suitable as lubricant additives in the metal-mechanic industry.

AB - Lubrication of moving components is critical for lowering friction and reducing energy consumption. Nanoparticles have been recently studied as additives for improving the load-carrying capacity and overall tribological performance of lubricants employed for metal-mechanic applications. Cerium oxide is a lanthanide metal oxide (rare earth) with environmentally friendly characteristics that is widely used for consumer products, and most recently for enhancing the tribological performance of composite materials and lubricants. In this work, formulated polymeric lubricants employed for metal forming processes with dispersed cerium oxide (CeO2) nanoparticles were characterized under extreme pressure (EP) conditions. Nanoparticle concentrations of 0.01, 0.05, and 0.10 wt.% were dispersed by homogenization and ultrasonication in the selected lubricant. Tribological characterization under EP was performed with a T-02 four-ball tribometer according to the ITeE-PIB Polish method for testing lubricants under conditions of scuffing. This method applies and increasing load of 0-7200 N to the tribopair in a very short amount of time (18s) and is employed to find the maximum pressure a lubricant film can withstand. The scuffing load (P t), and pressure loss limit or load carrying capacity (poz ) were determined after each test. Wear scar diameters (WSDs) of worn ball materials were measured with an Alicona optical 3D measurement system. The anti-wear (AW) and friction-reducing characteristics of CeO2 nanolubricants were determined with a T-05 block-on-ring test. No seizure was found for all lubricants likely due to the presence of additives in the polymeric lubricant. Nanoparticles were found to delay scuffing initiation at concentrations up to 0.05 wt.%, and the load required for scuffing increased by 35 %. The load-carrying capacity was enhanced by up to 84% with only 0.01 wt.% CeO2. Higher concentrations (0.10 wt.%) had a detrimental effect, most likely due to nanoparticle agglomeration. The coefficient of friction (COF) was lowered from 0.035 for the polymeric lubricant to 0.006 with a concentration of 0.01 wt.% CeO2.The tribological results obtained by both tests demonstrate that CeO2 nanoparticles have friction-reducing and EP characteristics, making them suitable as lubricant additives in the metal-mechanic industry.

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Pena-Paras L, Maldonado-Cortes D, Taha-Tijerina J, Irigoyen M, Guerra J. Experimental evaluation of the tribological behaviour of CeO2 nanolubricants under extreme pressures. In IOP Conference Series: Materials Science and Engineering. 7 ed. Vol. 400. Institute of Physics Publishing. 2018. 072003. (IOP Conference Series: Materials Science and Engineering). https://doi.org/10.1088/1757-899X/400/7/072003