Effect of few layer graphene additive on the tribological properties of lithium grease

2020 ◽  
Vol 32 (7) ◽  
pp. 333-343
Author(s):  
Zhanjun Li ◽  
Qiang He ◽  
Sanming Du ◽  
Yongzhen Zhang
Keyword(s):  
Tribological Properties ◽  
Lithium Grease ◽  
Layer Graphene ◽  
Few Layer Graphene

scholarly journals Tribological Properties of Ti2AlNb Matrix Composites Containing Few-Layer Graphene Fabricated by Spark Plasma Sintering

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 924
Author(s):  
Wei Wang ◽  
Ziru Han ◽  
Qingjuan Wang ◽  
Baojia Wei ◽  
Shewei Xin ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Tribological Properties ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Layer Graphene ◽  
Plasma Sintering ◽  
Ti2alnb Alloy ◽  
The Coefficient Of Friction ◽  
Spark Plasma ◽  
Few Layer Graphene

Ti2AlNb alloys with few-layer graphene were fabricated by spark plasma sintering (SPS) to enhance the tribological properties (TP) of the composite materials. Microstructure characteristics of the original few-layer graphene (FLG), Ti2AlNb powders, and the sintered composites were characterized by X-Ray Diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy. The experimental results indicated that FLGs were homogeneously distributed in the composites. Tribological results indicated that the coefficient of friction (COF) of the composites was reduced as the content of FLG increased. Compared with the pure Ti2AlNb alloy, the average COF of the composite with 1.0 wt.% FLG was decreased by 9.4% and the wear rate was decreased by 36%. Meanwhile, the microstructures of the worn surface showed that TiC particles and friction layers formed by residual FLGs were present on the surface of the composites after tribological test. It is proposed that Ti2AlNb alloys with FLGs presented the enhanced wear resistance.

Tribological characteristics of few-layer graphene over Ni grain and interface boundaries

Nanoscale ◽  
2016 ◽  
Vol 8 (12) ◽  
pp. 6646-6658 ◽  
Author(s):  
Manoj Tripathi ◽  
Firas Awaja ◽  
Guido Paolicelli ◽  
Ruben Bartali ◽  
Erica Iacob ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Metal Substrate ◽  
Tribological Characteristics ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Grain Topology

The tribological properties of metal-supported few-layered graphene depend strongly on the grain topology of the metal substrate.

Improved tribological properties of Si3N4/GCr15 sliding pairs with few layer graphene as oil additives

2017 ◽  
Vol 43 (16) ◽  
pp. 14218-14224 ◽  
Author(s):  
Lupeng Wu ◽  
Le Gu ◽  
Zhijie Xie ◽  
Chuanwei Zhang ◽  
Baoyu Song
Keyword(s):  
Tribological Properties ◽  
Layer Graphene ◽  
Oil Additives ◽  
Few Layer Graphene

scholarly journals Tribological Properties of Al2O3 Nanoparticles as Lithium Grease Additives

Lubricants ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 9
Author(s):  
Ahmed Nabhan ◽  
Ahmed Rashed ◽  
Nouby M. Ghazaly ◽  
Jamil Abdo ◽  
M. Danish Haneef
Keyword(s):  
Tribological Properties ◽  
Wear Scar ◽  
Al2o3 Nanoparticles ◽  
Lithium Grease ◽  
Pin On Disc ◽  
Scar Width

The tribological properties of Lithium grease specimens with different concentrations of Al2O3 nanoparticles were investigated using a pin on disc apparatus under different sliding speeds and normal loads. Results showed that Al2O3 nanoparticles enhanced the tribological properties of lithium grease and reduced the COF and wear scar width by approximately 57.9% and 47.5% respectively.

scholarly journals Properties of Silicone Rubber-Based Composites Reinforced with Few-Layer Graphene and Iron Oxide or Titanium Dioxide

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1550
Author(s):  
Vineet Kumar ◽  
Anuj Kumar ◽  
Minseok Song ◽  
Dong-Joo Lee ◽  
Sung-Soo Han ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Titanium Dioxide ◽  
Iron Oxide ◽  
Stress Relaxation ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Relaxation Rates ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Mechanical Actuation

The increasing demand for polymer composites with novel or improved properties requires novel fillers. To meet the challenges posed, nanofillers such as graphene, carbon nanotubes, and titanium dioxide (TiO2) have been used. In the present work, few-layer graphene (FLG) and iron oxide (Fe3O4) or TiO2 were used as fillers in a room-temperature-vulcanized (RTV) silicone rubber (SR) matrix. Composites were prepared by mixing RTV-SR with nanofillers and then kept for vulcanization at room temperature for 24 h. The RTV-SR composites obtained were characterized with respect to their mechanical, actuation, and magnetic properties. Fourier-transform infrared spectroscopy (FTIR) analysis was performed to investigate the composite raw materials and finished composites, and X-ray photoelectron spectroscopy (XPS) analysis was used to study composite surface elemental compositions. Results showed that mechanical properties were improved by adding fillers, and actuation displacements were dependent on the type of nanofiller used and the applied voltage. Magnetic stress-relaxation also increased with filler amount and stress-relaxation rates decreased when a magnetic field was applied parallel to the deformation axes. Thus, this study showed that the inclusion of iron oxide (Fe3O4) or TiO2 fillers in RTV-SR improves mechanical, actuation, and magnetic properties.

scholarly journals Temperature Dependence of G and D’ Phonons in Monolayer to Few-Layer Graphene with Vacancies

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Mingming Yang ◽  
Longlong Wang ◽  
Xiaofen Qiao ◽  
Yi Liu ◽  
Yufan Liu ◽  
...  
Keyword(s):  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Intrinsic Properties ◽  
Temperature Dependent ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Layer Graphene ◽  
A Value ◽  
Few Layer Graphene

Abstract The defects into the hexagonal network of a sp2-hybridized carbon atom have been demonstrated to have a significant influence on intrinsic properties of graphene systems. In this paper, we presented a study of temperature-dependent Raman spectra of G peak and D’ band at low temperatures from 78 to 318 K in defective monolayer to few-layer graphene induced by ion C+ bombardment under the determination of vacancy uniformity. Defects lead to the increase of the negative temperature coefficient of G peak, with a value almost identical to that of D’ band. However, the variation of frequency and linewidth of G peak with layer number is contrary to D’ band. It derives from the related electron-phonon interaction in G and D’ phonon in the disorder-induced Raman scattering process. Our results are helpful to understand the mechanism of temperature-dependent phonons in graphene-based materials and provide valuable information on thermal properties of defects for the application of graphene-based devices.

Few-layer graphene prepared via microwave irradiation of black sesame for supercapacitor applications

2021 ◽  
Vol 425 ◽  
pp. 130664
Author(s):  
Xinghe Xu ◽  
Shichang Sun ◽  
Juan Luo ◽  
Rui Ma ◽  
Junhao Lin ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Supercapacitor Applications
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