The Tribological Behavior of MoS2-Cr Films Sliding Against an Aluminum Counterface

2004 ◽  
Vol 843 ◽  
Author(s):  
James E. Krzanowski
Keyword(s):  
Wear Track ◽  
Tribological Performance ◽  
Transfer Film ◽  
Interface Reactions ◽  
Transfer Films ◽  
The Coefficient Of Friction ◽  
Oxide Particles ◽  
Pin On Disk ◽  
Cr Film ◽  
Al Oxide

ABSTRACTThe tribological performance of MoS2-Cr films in a pin-on-disk test sliding against an aluminum ball has been examined in this study. The MoS2-Cr films were deposited by pulsed laser deposition (MoS2) and simultaneous sputter deposition of Cr, giving a Cr content in the film of 10 mol. %. The results were also compared with films of MoS2 alone. The frictional behavior of MoS2-Cr films was not improved compared to the MoS2 alone, so SEM/EDS studies of the ball and flat were conducted to determine the nature of the transfer films and examine any interface reactions that occurred during the pin-on-disk (POD) test. In the early stages of the POD test (500 cycles) on the MoS2-Cr film, Al-oxide particles formed and caused cratering and scratching of the wear track, and the coefficient of friction neared 0.7. At later stages (9000 cycles), a thick oxide-based transfer film formed on the ball, but on the flat the track composition was closer to that of the original coating. For the films without Cr, after 104 cycles a smooth wear track was observed, and a thin transfer film of MoS2 was found within grooves on the ball wear scar along with Al oxide, which resulted in superior tribological performance.

scholarly journals Modified graphene as novel lubricating additive with high dispersion stability in oil

Friction ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 143-154 ◽  
Author(s):  
Pu Wu ◽  
Xinchun Chen ◽  
Chenhui Zhang ◽  
Jiping Zhang ◽  
Jianbin Luo ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Wear Track ◽  
Normal Load ◽  
Lubricant Additive ◽  
Tribological Performance ◽  
Dispersion Stability ◽  
High Dispersion ◽  
Base Oil ◽  
The Coefficient Of Friction ◽  
Modified Graphene

Abstract Graphene is a promising material as a lubricant additive for reducing friction and wear. Here, a dispersing method which combines chemical modification of graphene by octadecylamine and dicyclohexylcarbodiimide with a kind of effective dispersant has been successfully developed to achieve the remarkable dispersion stability of graphene in base oil. The stable dispersion time of modified graphene (0.5 wt%) with dispersant (1 wt%) in PAO-6 could be up to about 120 days, which was the longest time reported so far. At the same time, the lubricant exhibits a significant improvement of tribological performance for a steel ball to plate tribo-system with a normal load of 2 N. The coefficient of friction between sliding surfaces was ~0.10 and the depth of wear track on plate was ~21 nm, which decreased by about 44% and 90% when compared to pure PAO-6, respectively. Furthermore, the analysis of the lubricating mechanisms in regard to the sliding-induced formation of nanostructured tribo-film has been contacted by using Raman spectra and TEM.

scholarly journals Tribology of High-performance PEEK-, PI-, and ATSP-based Self-lubricating Polymers Up to 300 oC

2021 ◽  
Author(s):  
Kian Bashandeh ◽  
Pixiang Lan ◽  
Andreas A. Polycarpou
Keyword(s):  
High Performance ◽  
Tribological Performance ◽  
Low Friction ◽  
Transfer Films ◽  
Overall Performance ◽  
Low Wear ◽  
Pin On Disk ◽  
Environmental Temperatures ◽  
Lubricating Properties

Abstract High-performance polymers (HPPs) with self-lubricating properties are promising materials for bearing and tribological components that demand low friction and low wear in the absence of liquid lubrication. This study reports on the tribological performance of three advanced HPPs, namely ATSP-, PEEK-, and PI-based polymer composites. The experiments were performed using pin-on-disk configuration under dry sliding conditions and different environmental temperatures from 25 (room temperature) to 300 °C. The role of temperature on the formation of polymer transfer films on the steel counterpart was investigated using microscopy and profilometric measurements, and correlations were made to their tribological performance. From the three tested composites, ATSP-based composite exhibited the best overall performance with low friction and low wear.

Tribological Performance of PEEK Reinforced PTFE Composites under Dry Sliding Condition

2013 ◽  
Vol 774-776 ◽  
pp. 996-1000
Author(s):  
Dong Ya Yang ◽  
Yue Wang ◽  
Jun Gong
Keyword(s):  
Surface Morphology ◽  
Friction And Wear ◽  
Testing Machine ◽  
Tribological Performance ◽  
Transfer Film ◽  
Wear Testing ◽  
Ptfe Composite ◽  
Transfer Films ◽  
Ptfe Composites ◽  
Sintering Method

0-20wt.% PEEK reinforced PTFE composites were prepared by a cold pressing-sintering method. The tribological properties and surface morphology of the transfer films were investigated via a MRH-3 friction and wear testing machine and scanning electron microscopy (SEM) respectively. Results show that the wear resistance of PTFE composite is improved more than 670 times with the addition of 20wt.% PEEK and the lowest friction coefficient is obtained with 5wt.% PEEK. Surface morphology shows that the transfer film formed on the counterface becomes more and more uniform and continuous with the addition of PEEK filler, frictional trace on the transfer film suggests that abrasive wear occurred during the sliding process.

scholarly journals On the Microstructural, Mechanical and Tribological Properties of Mo-Se-C Coatings and Their Potential for Friction Reduction against Rubber

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1336
Author(s):  
Jorge Caessa ◽  
Todor Vuchkov ◽  
Talha Bin Yaqub ◽  
Albano Cavaleiro
Keyword(s):  
Carbon Content ◽  
Friction And Wear ◽  
Current Mode ◽  
Friction Reduction ◽  
Transition Metal Dichalcogenide ◽  
Butadiene Rubber ◽  
Wear Rates ◽  
Mechanical And Tribological Properties ◽  
The Coefficient Of Friction ◽  
Pin On Disk

Friction and wear contribute to high energetic losses that reduce the efficiency of mechanical systems. However, carbon alloyed transition metal dichalcogenide (TMD-C) coatings possess low friction coefficients in diverse environments and can self-adapt to various sliding conditions. Hence, in this investigation, a semi-industrial magnetron sputtering device, operated in direct current mode (DC), is utilized to deposit several molybdenum-selenium-carbon (Mo-Se-C) coatings with a carbon content up to 60 atomic % (at. %). Then, the carbon content influence on the final properties of the films is analysed using several structural, mechanical and tribological characterization techniques. With an increasing carbon content in the Mo-Se-C films, lower Se/Mo ratio, porosity and roughness appeared, while the hardness and compactness increased. Pin-on-disk (POD) experiments performed in humid air disclosed that the Mo-Se-C vs. nitrile butadiene rubber (NBR) friction is higher than Mo-Se-C vs. steel friction, and the coefficient of friction (CoF) is higher at 25 °C than at 200 °C, for both steel and NBR countersurfaces. In terms of wear, the Mo-Se-C coatings with 51 at. % C showed the lowest specific wear rates of all carbon content films when sliding against steel. The study shows the potential of TMD-based coatings for friction and wear reduction sliding against rubber.

scholarly journals Characteristic Scales of Wear Track Profiles Generated by Pin-on-Disk Wear Tests

2008 ◽  
Vol 3 (3) ◽  
pp. 205-210 ◽  
Author(s):  
Naofumi Hiraoka ◽  
Hiroyuki Matsumoto
Keyword(s):  
Wear Track ◽  
Pin On Disk ◽  
Characteristic Scales ◽  
Wear Tests

Tribological Properties of Polyoxymethylene Composites Against Aluminum

2003 ◽  
Vol 125 (3) ◽  
pp. 661-669 ◽  
Author(s):  
Masaya Kurokawa ◽  
Yoshitaka Uchiyama ◽  
Tomoaki Iwai ◽  
Susumu Nagai
Keyword(s):  
Wear Rate ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
High Surface ◽  
Surface Hardness ◽  
Disk Surface ◽  
Optical Microscope ◽  
Transfer Film ◽  
The Other ◽  
The Coefficient Of Friction

Tribological properties of several kinds of polyoxymethylene (POM) composites were evaluated for the purpose of developing a polymeric tribomaterial especially suited for mating with aluminum parts having low surface hardness. POM composites containing small amounts of silicon carbide (SiC), POM/SiC; those containing a small amount of calcium octacosanonoate besides SiC, POM/SiC/Ca-OCA; and the one blended with 24 wt % of polytetrafluoroethylene, POM/PTFE(24); were injection-molded into pin specimens and their tribological properties were tested by means of a pin-on-disk type wear apparatus using an aluminum (A5056) mating disk in comparison with a 303 stainless steel (SUS303) disk. Evaluation was focused on observation of the sliding surfaces of the pin specimens and the mating disks by a scanning electron microscope and an optical microscope together with the measurement of surface roughness. In the case of mating against a SUS303 disk having high surface hardness, all pin specimens did not roughen the disk surfaces even after long time of rubbing. Only POM/PTFE(24) composite obviously made a transfer film on the disk surface, while the other composites made an extremely thin one on it. POM/SiC(0.1)/Ca-OCA(1) composite, containing SiC 0.1 wt. % and Ca-OCA 1 wt. %, was found to show the lowest coefficient of friction and the lowest wear rate forming extremely thin transfer film on the mating disk. On the other hand, against an A5056 disk which has lower surface hardness than that of SUS303 disk, unfilled POM and POM composites except POM/SiC(0.1)/Ca-OCA(1) composite roughened the disk surfaces. However, the sliding surface of the A5056 disk rubbed with POM/SiC(0.1)/Ca-OCA(1) composite was significantly smoother and that of the pin specimen was also quite smooth in comparison with other pin specimens. Further, when each POM composite was rubbed against the A5056 disk, formation of transfer film was not obvious on the disk surfaces. For POM/SiC(0.1)/Ca-OCA(1) composite, the wear rate was the lowest of all POM composites, and the coefficient of friction was as low level as 60 percent of that of unfilled POM, but slightly higher than that of POM/PTFE(24) composite. For POM/SiC(0.1)/Ca-OCA(1) composite, the nucleating effect of SiC and Ca-OCA, which accelerated the crystallization of POM during its injection molding to form a matrix containing fine spherulites, must have resulted in increasing the toughness of the matrix and lowering the wear rate. Also, the lubricant effect of Ca-OCA should have lowered the coefficient of friction of the same matrix for rubbing against aluminum mating disk. POM/SiC(0.1)/Ca-OCA(1) composite was concluded as an excellent tribomaterial for mating with aluminum parts.

Tribological Investigation of Copper (Cu) and Copper Oxide (CuO) Nanoparticles Based Nanolubricants for Machine Tool Slideways

2014 ◽  
Author(s):  
Saravanakumar Nesappan ◽  
Nallasamy Palanisamy ◽  
Mahesh Chandran
Keyword(s):  
Electron Microscope ◽  
Machine Tool ◽  
Copper Oxide ◽  
Elevated Temperatures ◽  
Stick Slip ◽  
Base Oil ◽  
Weight Composition ◽  
The Coefficient Of Friction ◽  
Oxide Particles ◽  
Mineral Lubricant

The present study intends to evaluate the tribological characteristics of Copper (Cu) and Copper oxide (CuO) based nanolubricant for its use in machine tool slideways. Different sizes of copper and copper oxide particles were chosen and physical characterisation were carried out using scanning electron microscope (SEM) and transmission electron microscope (TEM). The nanolubricants were prepared by adding various proportions (0.1%, 0.25%, 0.4% wt) of the particles in Polyalphaolefin (PAO) base oil with lecithin and oleic acid surfactants. Friction and stick-slip characteristics of the nanolubricants were assessed using pin-on-block reciprocating friction monitor simulating the actual loading conditions prevailing in machine tool slideways. Studies were also conducted under elevated temperatures to ascertain the performance of particles at higher temperatures. Extreme pressure properties of the lubricants were studied using Four Ball Tester. The results of the experiments were compared with ISO VG 32 oil, a conventional mineral lubricant meant for machine tool slideways and it was found that the tribological properties nanolubricants using both the nanoparticles were considerably better. The coefficient of friction found to be decreased by 2.5% and 17.5% for copper particles with 0.1% weight composition in ambient temperature and elevated temperature respectively. Whereas for copper oxide particles with 0.1% weight composition a reduction of 14.25% and 10% were obtained.

Wear Studies of Al2O3-ZrO2∙5CaO Composite Coatings for Tribological Applications

2018 ◽  
Vol 7 (3.4) ◽  
pp. 73
Author(s):  
Abhinav . ◽  
N Krishnamurthy ◽  
Ranjana Jain
Keyword(s):  
Composite Coatings ◽  
Spray Coating ◽  
High Hardness ◽  
Xrd Analysis ◽  
Atmospheric Plasma ◽  
Crystallographic Structure ◽  
The Coefficient Of Friction ◽  
Sem Micrograph ◽  
Composite Mixture ◽  
Pin On Disk

A composite mixture of Metco 105 SFP, 99.9% Al2O3 and Metco 201 NS, ZrO2.5CaO were blended in the pursuit of high hardness and improved wear resistance characteristics for tribological applications. In this context a composite mixture of alumina and calcia stabilized zirconia in 50:50 by wt. % proportion was developed, and applied over Al-6061 substrates. Atmospheric plasma spray coating technique was used to develop the coating systems. The ASTM G132 standard, a pin-on-disk tribometer was used to determine the specific wear rate at different normal loads of 5 N, 10 N and 15 N. Experimental results revealed that the top coat primarily subjected to sliding and localized abrasion and also confirmed with SEM micrograph. Sliding has mainly occurs in the plane of <111>, <200>, <220>, <311>, <222> found in the XRD analysis. Irrespective of the applied normal loads the coefficient of friction doesn’t influences much in the abrasive wear studies. However, wear mechanism was found to primarily dependent on the phases and on the crystallographic structure of the material used.  

scholarly journals Effect of Basalt Fibers for Reinforcing Resin-Based Brake Composites

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 490
Author(s):  
Xiaoguang Zhao ◽  
Jing Ouyang ◽  
Huaming Yang ◽  
Qi Tan
Keyword(s):  
Functional Group ◽  
Basalt Fiber ◽  
Physical And Mechanical Properties ◽  
Tribological Performance ◽  
National Standard ◽  
Basalt Fibers ◽  
Reinforcement Fiber ◽  
The Coefficient Of Friction ◽  
Extension Evaluation ◽  
Different Content

Basalt fiber is an eco-friendly reinforcement fiber in fabricating polymer composites with high specific mechanical physicochemical, biodegradable, and wear resistant properties. This article firstly introduces the composition, morphology, functional group, and thermostability of basalt fibers. Subsequently, friction composites based on a newly designed formulation were fabricated with different content basalt fibers. According to the Chinese National Standard, the physical and mechanical properties and tribological performance of the friction composites were characterized and evaluated. Extension evaluation based on extenics theory was developed to evaluate the relationships between the coefficient of friction and content of basalt fiber. Furthermore, the possible mechanism of basalt fiber reinforced friction composites was proposed.

Characteristics of the Transfer Film and Tribological Properties of Oxide/PTFE Composites

2013 ◽  
Vol 631-632 ◽  
pp. 172-175 ◽  
Author(s):  
Ting Xie ◽  
Zheng Hua Zhou ◽  
Zhen Xing Xu ◽  
Jian Wei Yu ◽  
Ming Hua Jiao
Keyword(s):  
Adhesion Strength ◽  
Tribological Properties ◽  
Interfacial Adhesion ◽  
Measured Data ◽  
Transfer Film ◽  
Micro Hardness ◽  
Transfer Films ◽  
Ptfe Composites ◽  
Interfacial Adhesion Strength ◽  
Better Than

The formed transfer film on the counterpart surface and tribological properties of PTFE composites filled with Al2O3 or SiO2 were investigated in this paper. The results indicated that under the same friction conditions, the friction coefficients of SiO2/PTFE and Al2O3/PTFE are very close to each other, but the wear resistance of SiO2/PTFE is superior to that of Al2O3/PTFE. According to the measured data, the micro-hardness and elastic modulus of the transfer film for SiO2/PTFE are much better than those of Al2O3/PTFE. In addition, the interfacial adhesion strength between the transfer film of SiO2/PTFE and the counterface is higher. It can be proved that the mechanical properties of transfer films for PTFE composites vary with different fillers and the friction transfer film with better adhesion strength and mechanical property is useful to improve the tribological properties of the composite.

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