Improving of the tribological properties of attapulgite base grease with graphene

Preparation and tribological properties of attapulgite – bentonite clay base grease

Industrial Lubrication and Tribology ◽

10.1108/ilt-07-2012-0062 ◽

2014 ◽

Vol 66 (4) ◽

pp. 538-544 ◽

Cited By ~ 4

Author(s):

Tiedan Chen ◽

Yanqiu Xia ◽

Zhilu Liu ◽

Zeyun Wang

Keyword(s):

Tribological Properties ◽

Bentonite Clay ◽

Solid Particles ◽

Lubricating Grease ◽

Content Type ◽

Base Oil ◽

Dropping Point ◽

Attapulgite Clay ◽

Surface Modified ◽

Base Grease

Purpose – The mixture of attapulgite and bentonite was used as a thickener, and polyalphaolefin was used as the base oil to prepare the new lubricating grease. Some solid particles such as Polytetrafluoroethene (PTFE), MoS2, nano-calcium carbonate and graphite were added in the new lubricating grease as anti-wear additives to investigate the tribological sensitivity. Design/methodology/approach – The new lubricating grease was evaluated by optimol-SRV reciprocating friction and wear tester, and the wear volumes were determined using a MicroXAM-3D. At the same time, the dropping point and the cone penetration were investigated and analyzed. The tribological properties of the new lubricating grease and the sensitivity of some solid lubricating additives to the new lubricating base grease were investigated; pure organic-bentonite and pure organic-attapulgite base grease were used as contrast. Findings – The new lubricating grease based on the surface-modified bentonite/attapulgite clay base grease was synthesized with a relatively high dropping point, and the mass ratio is 25/75 bentonite/attapulgite clay base grease, having a better tribological performance. MoS2 was used as an anti-wear additive that has good tribological sensitivity to the new lubricating base grease. Originality/value – The main innovative thought of this work lies in the mixture of attapulgite and bentonite used as thickener. A relevant report is not available at present.

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Tribological Properties of Complex Calcium Sulfonate Grease with Ultrafine SiO2/MoS2 Powders

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.66.35 ◽

2021 ◽

Vol 66 ◽

pp. 35-44

Author(s):

Li Ming Wu ◽

Bo Rui Yang ◽

Fang Xia Zhao ◽

Zhen Zhong Zhang

Keyword(s):

Particle Size ◽

Tribological Properties ◽

Mass Ratio ◽

Complex Calcium ◽

Wear Scar Diameter ◽

Load Range ◽

Calcium Sulfonate ◽

The Coefficient Of Friction ◽

Addition Amount ◽

Base Grease

For the development of complex calcium sulfonate grease containing ultrafine SiO2/MoS2 powders with self-reparing performance. On the basis of the dispersion of the nanoSiO2 particles, the effects of particle size,addition amount,load and the mass ratio of nanoSiO2 to ultrafine MoS2 powders on the tribological properties of commercial No.2 complex calcium sulfonate grease were systematically studied by four ball friction and wear tester. The results show that suitable particle size and addition amount of single SiO2 and MoS2 powders can significantly reduce the coefficient of friction (COF) and the wear scar diameter (WSD) of the grease. The composite of nanoSiO2 and MoS2 powder can broaden the load range of base grease and further improve the tribological properties of complex calcium sulfonate grease. When the mass ratio of nanoSiO2 powder to MoS2 powder is 3:7 and the total addition amount is 0.8wt%, the COF and the WSD of the grease are decreased by 53.64% and 27.08%, respectively, compared with the base grease. The two powders in the composite grease have synergy effect for improving the tribological performance and the friction stability of the grease during the process of long friction.

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Investigation of the Interaction, Rheological and Tribological Properties of Bis(pinacolato)diboron with Lithium Grease

Tribology Letters ◽

10.1007/s11249-021-01521-y ◽

2021 ◽

Vol 69 (4) ◽

Author(s):

J. Ren ◽

K. L. Gong ◽

G. Q. Zhao ◽

X. H. Wu ◽

X. B. Wang

Keyword(s):

Lewis Acid ◽

Tribological Properties ◽

Mechanical Stability ◽

Lewis Base ◽

Acid Base ◽

Tribochemical Reaction ◽

Lithium Grease ◽

Base Complex ◽

Lubrication Film ◽

Base Grease

AbstractIn this article, Lewis acid–base complex of lithium 12-hydroxystearate (LHS) with diboron compound is formed by the introduction of bis(pinacolato)diboron (B2Pin2) into lithium grease. The interaction between Lewis acid B2Pin2 and Lewis base RCO2− of LHS is characterized by various techniques. Moreover, the rheological and tribological behaviors of the base grease are evaluated at low and moderate temperature. The results indicate that the addition of B2Pin2 can noticeably enhance the rheological property of the base grease because the formation of Lewis acid–base complex is beneficial for improving the soap fiber structure strength, and B2Pin2 could also help reduce the friction and wear of the grease during the sliding process, which likely owing to the boundary lubrication film generated by B2Pin2 adsorption on the rubbing surface and tribochemical reaction between borate esters and steel surfaces. The improvement of mechanical stability and tribological properties is beneficial to increasing the grease service life. Graphical Abstract

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Graphene as a nanofiller for enhancing the tribological properties and thermal conductivity of base grease

RSC Advances ◽

10.1039/c9ra09201c ◽

2019 ◽

Vol 9 (72) ◽

pp. 42481-42488

Author(s):

Hui Fu ◽

Guoping Yan ◽

Meng Li ◽

Hao Wang ◽

Yapeng Chen ◽

...

Keyword(s):

Thermal Conductivity ◽

Friction Coefficient ◽

Tribological Properties ◽

Friction Surface ◽

Base Grease

The addition of graphene-reinforced grease to the mechanical friction surface can effectively reduce the friction coefficient and accelerate heat transportation.

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Tribological properties of nanometer Al2O3 and nanometer ZnO as additives in lithium-based grease

Industrial Lubrication and Tribology ◽

10.1108/ilt-10-2016-0241 ◽

2018 ◽

Vol 70 (6) ◽

pp. 953-960 ◽

Cited By ~ 2

Author(s):

Qiang He ◽

Zhigang Wang ◽

Anling Li ◽

Yachen Guo ◽

Songfeng Liu

Keyword(s):

Tribological Properties ◽

Wear Scar ◽

Composite Nanoparticles ◽

Wear Testing ◽

Wear Scar Diameter ◽

Lithium Grease ◽

Content Type ◽

Wear And Friction ◽

Friction Reducing ◽

Base Grease

Purpose Nanoparticles as the grease additives play an important role in anti-wear and friction-reducing property during the mechanical operation. To improve the lubrication action of grease, the tribological behavior of lithium-based greases with single (nanometer Al2O3 or nanometer ZnO) and composite additives (Al2O3–ZnO nanoparticles) were investigated in this paper. Design/methodology/approach The morphology and microstructure of nanoparticles were characterized by means of transmission electron microscope and X-ray diffraction. Tribological properties of different nanoparticles as additives in lithium-based greases were evaluated using a universal friction and wear testing machine. In addition, the friction coefficient (COF) and wear scar diameter were analyzed. The surface morphology and element overlay of the worn steel surface were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), respectively. Findings The results show that the greases with nanometer Al2O3 or nanometer ZnO and the composite nanoparticles additives both exhibit lower COFs and wear scar diameters than those of base grease. And the grease with Al2O3–ZnO composite nanoparticles possesses much lower COF and shows much better wear resistance than greases with single additives. When the additives contents are 0.4 Wt.% Al2O3 and 0.6 Wt.% ZnO, the composite nanoparticles-based grease exhibits the lowest mean COF (0.04) and wear scar diameter (0.65 mm), which is about 160% and 28% lower than those of base grease, respectively. Originality/value The main innovative thought of this work lies in dealing with the grease using single or composite nanoparticles. And through a serial contrast experiments, the anti-wear and friction-reducing property with different nanoparticles additives in lithium grease are evaluated.

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