Tribological Properties of Pb-Sn-CNTs Composite Coatings

2010 ◽  
Vol 152-153 ◽  
pp. 580-586
Author(s):  
Zheng Xi Hu ◽  
Xiao Hua Jie ◽  
Guo Hui Lu
Keyword(s):  
Carbon Nanotubes ◽  
Friction Coefficient ◽  
Composite Coatings ◽  
Work Conditions ◽  
Friction Condition ◽  
Electrodeposition Technique ◽  
Wear Performance ◽  
Weight Losses ◽  
Wet Friction ◽  
Multi Walled Carbon Nanotube

Multi-walled carbon nanotube (MWCNT)/Pb-Sn composite coatings were prepared by electrodeposition technique. Friction coefficient and wear weight losses were investigated on a double rings apparatus using carbon steel (C: 0.45%) rings as counterparts under wet friction condition. Tribological characteristics were compared among the samples as carbon nanotubes concentration was changed in the bath. The results indicate that the composite coatings had smaller friction coefficient and weight loss than that of ordinary Pb-Sn coatings under the same work conditions. In addition, the wear performance of Pb-Sn-CNTs composite coating was optimized when the CNTs concentration in bath was 2 g L-1.

The Crystallization Characteristics of Carbon Nanotubes/Pb-Sn Composite Coatings

2011 ◽  
Vol 189-193 ◽  
pp. 300-305
Author(s):  
Zheng Xi Hu ◽  
Xiao Hua Jie ◽  
Guo Hui Lu
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Network Structure ◽  
Crystal Orientation ◽  
Composite Coatings ◽  
Growth Time ◽  
Electrodeposition Technique ◽  
Multi Walled Carbon Nanotube

Multi-walled carbon nanotube (MWCNT)/Pb-Sn composite coatings and ordinary Pb-Sn alloy coatings were prepared by electrodeposition technique, respectively. The morphology images of the coatings in different growth time were observed by SEM at high and low magnifications. The results showed that composite coatings had a compacter and refiner surface than ordinary Pb-Sn alloy coatings; the addition of CNTs increased the number of crystal cores and changed the directions of crystal orientation, which resulted in a fine network structure.

scholarly journals Enhanced Wear Performance of Cu-Carbon Nanotubes Composite Coatings Prepared by Jet Electrodeposition

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 392 ◽  
Author(s):  
Dongdong Ning ◽  
Ao Zhang ◽  
Hui Wu
Keyword(s):  
Carbon Nanotubes ◽  
Surface Morphology ◽  
Composite Coating ◽  
Composite Coatings ◽  
Sodium Dodecyl ◽  
Wear Test ◽  
Uniform Electric Field ◽  
Wear Performance ◽  
Jet Electrodeposition ◽  
Pure Cu

Cu-carbon nanotubes (CNTs) composite coatings with high CNT content and uniformly distributed CNTs were successfully prepared via jet electrodeposition. Pristine CNTs, without any treatment like acid functionalization, were used. Anionic surfactant sodium dodecyl sulfate (SDS) was used to increase the wettability of the CNTs and improve the content of incorporated CNTs. With an appropriate SDS concentration (300 mg/L) in the electrolyte, the incorporated CNT content is as high as 2.84 wt %, much higher than the values reported using conventional electrodeposition (0.42–1.05 wt %). The high-content CNTs were uniformly distributed in the composite coating. The surface morphology of this composite coating (2.84 wt % CNTs) was flat due to the uniform electric field in jet electrodeposition. In the wear test a with load of 1 N and sliding speed of 0.02 m/s, the wear rate of this composite coating was 1.3 × 10−2 mg/Nm, 85.4% lower than that of pure Cu. The enhanced wear performance of Cu-CNTs composite coatings can be attributed to high CNT content and flat surface morphology.

Study on Dispersion of Carbon Nanotubes in Pb-Sn Electroplating Bath

2015 ◽  
Vol 778 ◽  
pp. 168-173
Author(s):  
Zheng Xi Hu ◽  
Xiao Hua Jie
Keyword(s):  
Carbon Nanotubes ◽  
Friction Coefficient ◽  
Milling Time ◽  
Composite Coatings ◽  
Volume Percent ◽  
Composite Plating ◽  
Friction Tester ◽  
Disperse Carbon ◽  
Plating Solution ◽  
Ball Milling Time

In order to get homogeneously dispersed carbon nanotubes suspension for composite plating, carbon nanotubes were ball milled for different times and polycyclic acid (PA) was used as dispersant in this work. Sedimentation ratio was calculated by measuring the absorbance of suspensions and friction coefficient of the composite coatings was measured by friction tester. Dispersant content and ball milling time on the dispersive stability of suspension were studied. The dispersion mechanisms were discussed. The results showed that PA could effectively disperse carbon nanotubes in Pb-Sn electroplating solution. When the volume percent of PA was 0.3%, milling time was 6h and the milling speed was 300r/min, the sedimentation ratio was the smallest. The composite coatings had the smallest friction coefficient. Besides, the mechanism of PA effectively dispersing CNTs in Pb-Sn electro plating solution was electrostatics stabilization.

scholarly journals Composite Coatings with Ceramic Matrix Including Nanomaterials as Solid Lubricants for Oil-Less Automotive Applications

2016 ◽  
Vol 61 (2) ◽  
pp. 1039-1043 ◽  
Author(s):  
A. Posmyk ◽  
J. Myalski ◽  
B. Hekner
Keyword(s):  
Carbon Nanotubes ◽  
Shear Strength ◽  
Friction Coefficient ◽  
Solid Lubricant ◽  
Composite Coatings ◽  
Ceramic Matrix ◽  
Solid Lubricants ◽  
Metal Nanowires ◽  
Theoretical Point ◽  
Low Shear

Abstract The paper presents the theoretical basis of manufacturing and chosen applications of composite coatings with ceramic matrix containing nanomaterials as a solid lubricant (AHC+NL). From a theoretical point of view, in order to reduce the friction coefficient of sliding contacts, two materials are required, i.e. one with a high hardness and the other with low shear strength. In case of composite coatings AHC+NL the matrix is a very hard and wear resistant anodic oxide coating (AHC) whereas the solid lubricant used is the nanomaterial (NL) featuring a low shear strength such as glassy carbon nanotubes (GC). Friction coefficient of cast iron GJL-350 sliding against the coating itself is much higher (0.18-0.22) than when it slides against a composite coating (0.08-0.14). It is possible to reduce the friction due to the presence of carbon nanotubes, or metal nanowires.

Effect of Water on Friction and Wear Performance of Bamboo Fiber Reinforced Resin Matrix Composites

2012 ◽  
Vol 557-559 ◽  
pp. 277-280
Author(s):  
You Xi Lin ◽  
Wei Xie ◽  
Fu Shan He
Keyword(s):  
Friction Coefficient ◽  
Bamboo Fiber ◽  
Resin Matrix ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Wear Performance ◽  
Wet Friction ◽  
Wet Condition ◽  
Dry And Wet Conditions ◽  
Worn Surface

Bamboo fiber reinforced resin matrix brake materials were selected as research object, dry and wet friction experiment was conducted on MM200 abrasion tester. Results show that: friction coefficient drops down to a very low level under wet condition, wear rate of samples and counterparts also decreases, but the values of friction coefficient are still in the range of dry friction. Under dry and wet conditions, the tribilogical performance of sample has different relationships with the pressure and speed, especially with the speed. Friction surface was lubricated and cooled by water, in the meantime, the formation of friction film is suppressed, which leads to the differences of the tribilogy performance between dry and wet conditions. Morphologies of fricion surface was observed by SEM, worn surface in wet braking was not covered by friction film, many fine cracks and some patches were scattered over the substrate.

scholarly journals Influence of Natural Serpentine on the Tribological Performance of Phosphate Bonded Solid Coatings

2021 ◽  
Author(s):  
Zhengchao Xi ◽  
Jianbo Sun ◽  
Lei Chen ◽  
Haixia Cui ◽  
Yanjun Ma ◽  
...  
Keyword(s):  
Composite Coatings ◽  
Tribological Performance ◽  
Interfacial Interaction ◽  
Friction Condition ◽  
Experimental Result ◽  
Wear Performance ◽  
Friction Process ◽  
Friction Heat ◽  
Phosphate Coatings

Abstract Natural serpentine powders were incorporated into phosphate bonded solid coatings to promote the anti-wear performance of the phosphate coatings. Optimal mass percent of natural serpentine in phosphate coatings was firstly explored. Thereafter, in order to stimulate layer slip of natural serpentine and strengthen interfacial interaction between natural serpentine and counterface during the friction process, tribological performance of the composite coatings under different friction condition was properly investigated. The experimental result indicated that the optimal incorporation of natural serpentine in phosphate coatings was 10 wt.%, through which anti-wear performance of phosphate coatings was significantly elevated. Additionally, accompanied by the increase of applied load and sliding speed, natural serpentine was activated by friction force and local friction heat, and simultaneously interfacial interactions between naturals serpentine and counterface were intensified. As a result, a continuous protective tribo-film was in-situ formed on the counterface, through which anti-wear performance of phosphate coatings were significantly promoted. At the same time, serious furrows generated on the counterface were also effectively self-repaired during the friction process, and further abrasion on the counterface was greatly restrained.

scholarly journals Comparison between multi-walled carbon nanotubes and titanium dioxide nanoparticles as additives on performance of turbine meter oil nano lubricant

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hadi Pourpasha ◽  
Saeed Zeinali Heris ◽  
Yaghob Mohammadfam
Keyword(s):  
Carbon Nanotubes ◽  
Titanium Dioxide ◽  
Friction Coefficient ◽  
Pressure Drop ◽  
Mass Fraction ◽  
Viscosity Index ◽  
Wear Depth ◽  
Nano Lubricant ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractThis research aims of compare the impact of the mass fraction of multi-walled carbon nanotubes (MWCNTs) and titanium dioxide (TiO2) nano additive on the tribological and thermophysical attributes of turbine meter oil. These attributes include the average friction coefficient, pressure drop, wear, flash point, pour point, relative viscosity, kinematics viscosity, and viscosity index. The pressure drops and the average friction coefficient inside the copper tube were simulated and compared with experimental results. In this study, for the synthesis of nano lubricants from turbine meter oil as a pure fluid and from MWCNTs and TiO2 as nano additives in the mass fraction of 0.05, 0.1, 0.2, 0.3, and 0.4 wt.% and from oleic acid and Triton x100 as surfactants were utilized. The results illustrated that the wear depth of copper pins in the presence of nano lubricant with 0.4 wt.% of MWCNTs and 0.1 wt.% TiO2 was improved by 88.26% and 71.43%, respectively. Increasing 0.3 wt.% of TiO2 and MWCNTs into the oil caused to improvement in viscosity index. The simulation data and experimental data for the pressure drop were closer together and indicated a minor error that the maximum error is less than 10%.

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