Investigation of Micro-Tribological Behavior of MS2 Nanotubes

2007 ◽  
Vol 121-123 ◽  
pp. 785-788 ◽  
Author(s):  
Chang Sheng Li ◽  
Ke Hong Yan ◽  
Jun Mao Li ◽  
Xiao Ping Shen ◽  
Kang Min Chen
Keyword(s):  
Friction Coefficient ◽  
Tribological Behavior ◽  
Solid Lubricants ◽  
Van Der Waals Interactions ◽  
Low Friction ◽  
Research Papers ◽  
Friction Process ◽  
Pin On Disc ◽  
Metal Dichalcogenides ◽  
Covalent Interactions

It is well known that metal dichalcogenides MS2 (M=Mo, W, Nb, Ta, TiS, Zr ,Hf, S=S, Se) have lamellar structure, the bonds of adjacent lamellae are weak van der Waals interactions and inter-lamellar are strong covalent interactions. The structures make adjacent lamellae easy to slip and it shows low friction coefficient during friction process. MS2 are often used as solid lubricants in high/low temperature, heave load and vacuum, in which oil is failure. WS2 has better high temperature properties than MoS2, although little natural WS2 mineral has been deposited, and people must synthesize it by chemical means, so its price is nearly 5 times expensive than that of MoS2. Until now little study is made comparing with MoS2. Furthermore the research papers about tribological behavior of NbS2, TaS2, TiS2, ZrS2, HfS2 are not seen. In this study the thermal decomposition method is used to produce fullerene-like MS2 nanotubes. The morphology, microstructure and tribological behavior of MS2 nanotubes are investigated by means of SEM, TEM, XRD and AFM. The results show that the diameter of MoS2, WS2 and NbS2 nanotube is less than 100nm, and the length is more than 2μm. The MoS2, WS2 nanotube has lower friction coefficient than MoS2 powder tested by AFM using Si3N4 probe. Similar results are also found for NbS2 nanotube. The macroscopic friction test for pin on disc tester shows nearly the same results. TEM image shows that MS2 nanotubes have rolling debris between two antagonist surfaces, and MoS2 powder only has flattened debris. It may be the fullerene structure brings the chemical stability and lead low friction.

Tribological Behavior of PTFE Nanocomposites Reinforced with PBA Grafted Alumina Nanoparticles

2012 ◽  
Vol 184-185 ◽  
pp. 1380-1383
Author(s):  
Yong Ping Niu ◽  
Xiang Yan Li ◽  
Jun Kai Zhang ◽  
Ming Han ◽  
Yong Zhen Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Tribological Behavior ◽  
Compression Molding ◽  
Alumina Nanoparticles ◽  
Low Friction ◽  
Grafted Nanoparticles ◽  
Scanning Electron

Polybutyl acrylate (PBA) grafted alumina nanoparticles were synthesized. Polytetrafluoroethylene (PTFE) nanocomposites reinforced with PBA grafted nanoparticles were prepared by compression molding. The effects of PBA grafted nanoparticles on the tribological behavior of the PTFE nanocomposites were investigated on a tribometer. The abrasion mechanisms of the PTFE nanocomposites were investigated by scanning electron microscopy (SEM) of the abraded surfaces. The results show that the addition of PBA grafted nanoparticles maintains low friction coefficient and improves the wear resistance of the PTFE nanocomposites.

scholarly journals Development of hot surfaces generated by friction contacts of titanium alloy and steel

2020 ◽  
Vol 12 (9) ◽  
pp. 168781402095779
Author(s):  
He Pan ◽  
Yang Zhang
Keyword(s):  
Titanium Alloy ◽  
Friction Coefficient ◽  
Surface Temperature ◽  
Coal Mine ◽  
Ignition Source ◽  
Low Friction ◽  
Friction Process ◽  
Tc4 Titanium Alloy ◽  
Element Simulation ◽  
Hot Surface

When light alloys used in coal mine, the sparks generated by mechanical friction and impacts are the main effective ignition source. While the hot surfaces are concomitant in friction process, prior to the occurrence of mechanical sparks, whether the hot surfaces will be an effective ignition source. Then this paper focuses on the development of hot surfaces generated by TC4 titanium alloy at the low friction velocities. Experiments and finite element simulation methods were used together to describe the temperature field of TC4 titanium alloy. It was found that the temperature of hot surfaces increased with the load and increased much faster at higher relative speed. By means of regression analysis, the variation law of friction coefficient and contact pressure with loads and the variation law of hot surface temperature with friction coefficient and pressure were studied, then the fitting curve of hot surface temperature was obtained. The results of calculations and experiments indicate that hot surfaces generated by light alloy was possible to be an effective ignition source for methane air mixture in coal mine.

Anti Friction Properties of Motor Oil Dispersed with WS2 and MoS2 Nanoparticles

2014 ◽  
Vol 592-594 ◽  
pp. 1272-1276
Author(s):  
V. Srinivas ◽  
Dedeepya Valluripally ◽  
P.V. Manikanta ◽  
V. Satish
Keyword(s):  
Friction Coefficient ◽  
Performance Analysis ◽  
Tribological Behavior ◽  
Motor Oil ◽  
Base Oil ◽  
Base Oils ◽  
Pin On Disc ◽  
Surface Modified

This works presents a study on anti friction properties, of fully formulated SAE 20W 40 grade motor oil dispersed with surface modified WS2and MoS2nanoparticles. WS2and MoS2particles of 0.05 wt. % and 0.1 wt. % have been dispersed in SAE 20W 40 motor oil by Sonication and tested for tribological behavior on pin on disc apparatus as per ASTM G99 standards. The friction coefficient values for base oil and oil dispersed with WS2and MoS2nanoparticles have been evaluated and compared to obtain the performance analysis. Performance graphs have plotted for the base oil and oil dispersed with nanoparticles for comparison. The oils with dispersed nanoparticles have shown enhanced performance in comparison to the base oils in terms of anti friction properties.

scholarly journals Effect of Lattice Defects on Tribological Behavior for Low Friction Coefficient under Lubricant in Nanostructured Steels

2015 ◽  
Vol 101 (10) ◽  
pp. 530-535 ◽  
Author(s):  
Yoshikazu Todaka ◽  
Kenichi Toda ◽  
Motohiro Horii ◽  
Minoru Umemoto
Keyword(s):  
Friction Coefficient ◽  
Tribological Behavior ◽  
Lattice Defects ◽  
Low Friction

scholarly journals Tribo-oxide Competition and Oxide Layer Formation of Ti3SiC2/CaF2 Self-Lubricating Composites during the Friction Process in a Wide Temperature Range

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7466
Author(s):  
Rui Zhang ◽  
Wei Feng ◽  
Fuyan Liu
Keyword(s):  
Compressive Strength ◽  
Friction Coefficient ◽  
Tribological Behavior ◽  
Decomposition Temperature ◽  
Layer Formation ◽  
Friction Process ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Worn Surface ◽  
Self Lubricating Composites

Ti3SiC2/CaF2 composites were prepared by the spark plasma sintering (SPS) process. Both the microstructure of Ti3SiC2/CaF2 and the influence of test temperature on the tribological behavior of the Ti3SiC2/CaF2composites were investigated. The synergistic effect of friction and oxidation was evaluated by analyzing the worn surface morphology. The results showed that Ti3SiC2/CaF2 were still brittle materials after adding CaF2, which was in agreement with Ti3SiC2. The hardness, relative density, flexural strength and compressive strength of the Ti3SiC2/CaF2 composites were slightly lower than those of Ti3SiC2, and the addition of CaF2 decreased the decomposition temperature of Ti3SiC2 from 1350 to 1300 °C. Simultaneously, as the temperature of the test increased, the friction coefficient of Ti3SiC2/CaF2 showed a downward trend (from 0.81 to 0.34), and its the wear rate was insensitive.

Sliding Friction Behavior of Sintered Ni-Cr Composites with Solid Lubricants

2021 ◽  
Vol 875 ◽  
pp. 272-279
Author(s):  
Wan Farhana Mohamad ◽  
Amir Azam Khan ◽  
Pierre Barroy ◽  
Olivier Durand-Drouhin ◽  
Clement Puille ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Solid Lubricant ◽  
Sliding Friction ◽  
Solid Lubricants ◽  
Sem Analysis ◽  
Low Friction ◽  
Friction Behavior ◽  
Hardness Tester ◽  
Disc Configuration ◽  
Ball On Disc

High temperature applications of self-lubricated sliding surfaces have gained industrial importance during the recent years. One popular system is based on sintered Ni-Cr composites with addition of solid lubricants. In the present work these composites were prepared under controlled sintering conditions with different combinations of solid lubricants (MoS2, Ag and CaF2) at 1200 °C under flowing argon. The physical properties such as sintered density, relative density and porosity were studied. The microstructures and phase studies of the Ni-Cr based composites were conducted using SEM analysis while the hardness of the composites was measured by Vickers Micro Hardness Tester. The friction tests were conducted with ball on disc configuration following ASTM G-99-95a standard. The MoS2 solid lubricant provides best lubrication at room temperature which is demonstrated by a low friction coefficient compared to pure Ni-Cr composites. The SEM pictures of worn out tracks show solid debris distribution, and filling of pores with solid lubricant phases. The time taken for stabilization of friction coefficient also varies with the type of solid lubricant. Dual and multiple additions of solid lubricants are also able to reduce the friction of coefficient compared to pure Ni-Cr composite.

Synthesis and Investigation of Micro-Tribological Behavior of WS2 Nanotube

2005 ◽  
Vol 475-479 ◽  
pp. 3521-3524 ◽  
Author(s):  
Chang Sheng Li ◽  
Ke Hong Yan ◽  
Zhen Fan ◽  
Xiao Ping Shen ◽  
Kang Ming Chen ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
High Temperature ◽  
Low Temperature ◽  
Decomposition Method ◽  
Tribological Behavior ◽  
Solid Lubricants ◽  
High Load ◽  
Oil Lubrication ◽  
Low Friction ◽  
Thermal Decomposition Method

MS2(M=Mo, W, S=S, Se) are often used as solid lubricants in high/low temperature, high load, vacuum, in which oil lubrication is failed. Although WS2 is much more expensive than MoS2, it has better high temperature properties than MoS2. Thermal decomposition method is used to produce fullerence-like WS2 nanotube on Al2O3 template using (NH4)2WS4. The fabricated WS2 nanotube’s diameter is about 100nm and its length is longer than 2µm.The morphology, microstructure and tribological behavior of WS2 nanotube are investigated by means of SEM, TEM, XRD and AFM. The friction force between Si3N4 probe of AFM with WS2 nanotube is lower than that with MoS2 powder. Similar results are also found in pin-disc tester by GCr15 pin and lubricants coating disc. The results of HETEM show that WS2 nanotube has rolling debris between the two antagonist surfaces, and MoS2 powder only has flattened debris. It may be the fullerence structure brings the chemical stability and leads to low friction.

Formation Mechanisms of Tribo-Coating for Low Friction in UHV

2005 ◽  
Author(s):  
Koshi Adachi ◽  
Hisakazu Sato ◽  
Koji Kato
Keyword(s):  
Friction Coefficient ◽  
Composite Structure ◽  
Solid Lubricant ◽  
Silicon Oxide ◽  
Solid Lubricants ◽  
Solid Lubrication ◽  
Formation Mechanisms ◽  
Coating Film ◽  
Low Friction ◽  
Indium Film

Solid lubrication film formed by tribo-coating, which deposits a solid lubricant by evaporation to the contact interface during friction in vacuum, gives low friction coefficient below 0.03 that can not be observed by any other solid lubricants of soft metals. The tribo-coating film formed on the pin has nano-order composite structure which the crystalline indium of nano size are distributed in an amorphous matrix of silicon oxide and chromium oxide. Because of the nano composite structure, a very thin indium film is formed without break down like conventional pre-coated thin film. The thinner indium film can give smaller value of friction coefficient than that of conventional solid lubricant.

Multifractal Detrended Fluctuation Analysis on Friction Coefficient During the Friction Process

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Guodong Sun ◽  
Hua Zhu ◽  
Cong Ding ◽  
Yuankai Zhou
Keyword(s):  
Friction Coefficient ◽  
Detrended Fluctuation Analysis ◽  
Tribological Behavior ◽  
Multifractal Spectrum ◽  
Fluctuation Analysis ◽  
Friction Process ◽  
Multifractal Detrended Fluctuation Analysis ◽  
Aisi 52100 ◽  
Aisi 1045 ◽  
Detrended Fluctuation

The dynamic evolutionary law and tribological behavior of tribopair AISI 52100-AISI 1045 were studied via the multifractal method. Friction experiment was performed on a ring-on-disk tribometer under lubrication, and the multifractal detrended fluctuation analysis (MF-DFA) method was adapted to characterize the multifractality of the friction coefficient. The multifractal spectra first exhibited a left-hook, then right-hook, and left-hook, respectively, during the friction stages. The multifractal spectrum width W decreases in running-in friction process, maintains at small values in steady friction process, and increases rapidly in increasing friction process. Corresponding shuffled series was analyzed to distinguish that the multifractality of friction coefficient is due to the long-range correlation of the fluctuations. The results inform quantitative interpretations of friction system's tribological behavior and friction process identification.

Friction Process of Superlubricity

2012 ◽  
Author(s):  
Jinjin Li ◽  
Chenhui Zhang ◽  
Jianbin Luo
Keyword(s):  
Friction Coefficient ◽  
Phosphoric Acid ◽  
Acid Solution ◽  
Layer Structure ◽  
Contact Region ◽  
Phosphoric Acid Solution ◽  
Low Friction ◽  
Friction Process ◽  
Second Stage ◽  
Three Stages

The friction process of superlubricity (μ = 0.004) obtained by phosphoric acid solution has been investigated by a traditional tribometer. The evolution of friction coefficient with time indicates that the friction process of superlubricity is divided into three stages, i.e. friction reducing rapidly process, low friction process and superlubricity process. The feature of these three stages is discussed according to several experiments. The result indicates that the contact region in superlubricity state is a three layer structure formed after the first stage and the second stage, which is the origin of ultra-low friction.

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