Effect of CuO and ZnO Nano-Additives on the Tribological Performance of Paraffin Oil–Based Lithium Grease

Rawat, Sooraj Singh; Harsha, A. P.; Das, Santanu; Deepak, Agarwal Pratik

doi:10.1080/10402004.2019.1664684

Cited by 31 publications

(15 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another study by Rawat et al analysed the wear-resistance of CuO and ZnO paraffin nano-greases (concentration ranging between 0.2 and 1.0 wt%) using a four-ball tester. 43 The maximum reduction in the wear volume of about 36% and 56% was achieved for 0.2 wt% CuO and ZnO, respectively. The wear reduction was primarily attributed to the deposition of the nano-particles on of the rubbing surfaces, thus forming a protective layer primarily bolstered by the spherical morphology of the nano-particles assessed.…”

Section: Lubrication and Wear Resistancementioning

confidence: 91%

“…GO, rGO and GO‐ODA decreased the resulting COF by about 34.3%, 50.3% and 34.3% and wear volume by about 86.6%, 85.4%, 80.9%, respectively. Another study by Rawat et al analysed the wear‐resistance of CuO and ZnO paraffin nano‐greases (concentration ranging between 0.2 and 1.0 wt%) using a four‐ball tester 43 . The maximum reduction in the wear volume of about 36% and 56% was achieved for 0.2 wt% CuO and ZnO, respectively.…”

Section: Development Of Enhanced Lubricants and Greasesmentioning

confidence: 99%

See 1 more Smart Citation

Latest developments in designing advanced lubricants and greases for electric vehicles—An overview

Shah¹,

Gashi²,

Rosenkranz

2022

Lubrication Science

View full text Add to dashboard Cite

According to the Environmental Protection Agency, transportation is the largest contributor of greenhouse gas emissions (28% of total emissions). Electric vehicles have remarkably grown in popularity and represent a greener future for the automotive industry. This growth has prompted lubricant and grease technology to adapt to an entirely new environment, which is exposed to new factors including external electric currents/fields and extreme temperatures and pressures originating from electric motors and power electronics. Consequently, novel lubricants and greases need to be developed and explored to ultimately improve fuel efficiency and performance. Nano-additives have offered exceptional opportunities to enhance electrical, thermal and tribological properties of the lubricants and greases used. It is thus vital to fully explore and understand the effects of nanoparticles' addition to lubricants and greases, as well as the mechanisms by which improvements are obtained. This perspective summarises the recent trends of developing lubricants and greases for electric vehicles.

show abstract

Section: Lubrication and Wear Resistancementioning

confidence: 91%

Section: Development Of Enhanced Lubricants and Greasesmentioning

confidence: 99%

Latest developments in designing advanced lubricants and greases for electric vehicles—An overview

Shah¹,

Gashi²,

Rosenkranz

2022

Lubrication Science

View full text Add to dashboard Cite

show abstract

“…Their antiwear results showed approximately 36%, and approximately 56% maximum reduction in the mean wear volume when using only 0.2% w/w CuO and ZnO, respectively. Moreover, at the same weight ratio, the energy consumption decreased by approximately 31% and approximately 28% [18].…”

Section: Introductionmentioning

confidence: 89%

Manufacturable Novel Nanogrease with Superb Physical Properties

et al. 2021

View full text Add to dashboard Cite

High-performance nanogrease manufactured from carbon nanomaterials is observed to be stable and homogeneous and have superb physical properties, such as thermal and electrical conductivities, compared with current commercial greases made of lithium, calcium, and aluminum. For the first time, carbon nanomaterials have been observed to disperse well as the sole thickeners in oil systems, e.g., polyalphaolefin and polyester (ROYCO), without the aid of any chemical surfactants. Three-dimensional percolation network structures that exist among carbon nanomaterials are easily scalable, which can be attributed to the intermolecular van der Waals forces. Moreover, the introduction of hydrogen bonding in any form to grease significantly increases its thermal and electrical conductivities and substantially reduces the weight percentage of carbon nanomaterials needed to fabricate stable grease. For example, loading of only 1.4 wt% hydroxyl-functionalized multiwalled carbon nanotube (MWNT-OH) with Krytox XHT750 oil leads to a 37.8% increase in thermal conductivity. Moreover, 75% glycerol, 25% water, and 4.5 wt% MWNT-OH yielded the lowest electrical resistivity of 10.0 Ω cm. This finding can be extended to hydrogen bonding materials with functional groups, such as OH, COOH, F, and NH. The nanogrease reported in this study has been manufactured using the three-roll mill method, which is an easy and cost-effective method, as the loading weight percentage of carbon nanomaterials to fabricate stable grease decreases from 12 wt% to 3-4 wt%. Furthermore, the process is easily scalable, reproduced, and optimized. This novel high-performance nanogrease has a high commercial value and numerous applications and could replace current commercial greases.

show abstract

“…Therefore, the amount of power consumed to overcome friction (i.e., frictional power loss) during tribo-testing was computed using Equation (1). 19 F I G U R E 5 Variation in the drop point of PAO grease with and without nanoadditives.…”

Section: Antifriction Performance Of Grease Samplesmentioning

confidence: 99%

“…The tribological performance of mineral oil-based greases with nanoadditives has been extensively studied. [18][19][20][21][22][23] Furthermore, chemically-treated nanoadditives demonstrated the ability to improve the tribological performance of greases. [24][25][26] The excellent lubricating performance of synthetic oils has attracted researchers to investigate their tribological performance as the base oil in lubricating grease.…”

Section: Introductionmentioning

confidence: 99%

Tribological evaluation of PAO 100 oil‐based lithium greases with chemically functionalized nanoadditives

Kumar

Harsha

Rawat

2023

Lubrication Science

Self Cite

View full text Add to dashboard Cite

The lubricating greases employed in this study were formulated with polyalphaolefin (PAO) 100 as the base oil and 12‐lithium hydroxystearate as the thickener. The sol–gel method was used to produce the LaF3 nanoadditives. The oleic acid‐treated LaF3 (i.e., OA‐LaF3) and carboxylic acid‐treated MWCNTs (i.e., COOH‐MWCNTs) were blended in the formulated grease samples and used as nanoadditives. The detailed microstructural and chemical properties of chemically treated nanoadditives were investigated using HR‐TEM, XRD, FTIR and XPS analyses. Using a four‐ball tester, the effect of different concentrations of nanoadditives on the tribo‐performance of greases was investigated. Tribo‐test results revealed the role of nanoadditives in PAO‐based grease lubrication performance. COOH‐MWCNTs and OA‐LaF3 nanoadditives outperformed PAO grease in terms of physicochemical and tribo‐performance for steel‐steel tribo‐pair. The improved tribo‐performance is attributed to the formation of tribo‐film on the contact interfaces via nanoadditives. The development of tribo‐film was confirmed by XPS analysis of worn surfaces.

show abstract

Effect of CuO and ZnO Nano-Additives on the Tribological Performance of Paraffin Oil–Based Lithium Grease

Cited by 31 publications

References 35 publications

Latest developments in designing advanced lubricants and greases for electric vehicles—An overview

Latest developments in designing advanced lubricants and greases for electric vehicles—An overview

Manufacturable Novel Nanogrease with Superb Physical Properties

Tribological evaluation of PAO 100 oil‐based lithium greases with chemically functionalized nanoadditives

Contact Info

Product

Resources

About