High Temperature Tribological Performance of Steel/Copper Friction Pairs Lubricated With a Modified C-WS2-(Fe3O4+TiN) Nanoadditives in Non-Copper Coated Solid Wires

2021 ◽  
Author(s):  
Hong Li ◽  
Jing Zhu ◽  
Yu Zhang ◽  
Zhuoxin Li ◽  
Bo Meng
Keyword(s):  
High Temperature ◽  
Friction And Wear ◽  
Ball Bearing ◽  
Tribological Performance ◽  
Wear Volume ◽  
Test Results ◽  
Nanoparticle Concentration ◽  
Tribological Test ◽  
Average Coefficient ◽  
Worn Surface

Abstract In this study, four kinds of nanoparticles: graphite, WS2, Fe3O4 and TiN were used as lubricating additives for steel/copper friction pairs to solve the problem of welding contact tube wear with non-copper-coated solid wire at high temperature. The single and composite nanoparticles have excellent dispersion stability in absolute ethanol under the action of the compound surfactant NaSTA+OA+PVP. The tribological test results showed that the maximum decrement with reference to the average coefficient of friction and wear volumes were measured with nanoparticle concentration in 1:1:1 ratio at 300℃. Compared with dry friction, the average friction coefficient and wear volume are reduced by 74.3% and 84.8%, respectively, which may be attributed to the formation of a stable tribo-film mainly composed of C-O, Fe2O3, WO3, TiO2, TiNxOy composite on the worn surface. Therefore, it is considered that the combined lubrication effects of the ball-bearing effect, repairing of worn surfaces and the tribo-film resulted in the lowest friction and wear.

Investigation of Tribological Behavior of Al–Si Alloy Against Steel Lubricated With Ionic Liquids of 1-Diethylphosphonyl-n-propyl-3- Alkylimidazolium Tetrafluoroborate

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Zonggang Mu ◽  
Xiaoxuan Wang ◽  
Shuxiang Zhang ◽  
Yongmin Liang ◽  
Meng Bao ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Photoelectron Spectroscopy ◽  
Friction And Wear ◽  
Room Temperature ◽  
Test Results ◽  
Tribological Test ◽  
X Ray ◽  
Imidazolium Cations ◽  
Metal Fluorides ◽  
Worn Surface

A series of room temperature ionic liquids bearing with phosphonyl groups on the imidazolium cations, namely, 1-(3′-O,O-diethylphosphonyl-n-propyl)-3-alkylimidazolium tetrafluoroborate, were prepared and their physical properties were determined. They were also evaluated as promising lubricants for the contacts of aluminum on steel by using a SRV test rig. The tribological test results show that the synthetic ionic liquids exhibit better friction-reducing and antiwear abilities than the unsubstituted ionic liquid of 1-ethyl-3-hexylimidazolium tetrafluoroborate (coded as L206) and phosphazene (X-1P). Both the anions and the side substitutes attached to the imidazolium cations affect the tribological performance of lubricants. The scanning electron microscopy, energy-dispersive x-ray analysis, and x-ray photoelectron spectroscopy analyses of the worn surfaces show that complicated tribochemical reactions are involved in the sliding process. The anion decomposition and chemical adsorption of cation took place on the worn surface of aluminum alloy during the sliding process. As a result of the generation of boundary lubrication films which are composed of metal fluorides, B2O3, BN, nitrogen oxide, and FePO4 help to effectively reduce the friction and wear of the contacts.

Oil-soluble ionic liquid to lubricate silicon

2021 ◽  
pp. 135065012098488
Author(s):  
Waleed Al-Sallami ◽  
Pourya Parsaeian ◽  
Abdel Dorgham ◽  
Anne Neville
Keyword(s):  
Ionic Liquid ◽  
High Temperature ◽  
Friction And Wear ◽  
Tribological Performance ◽  
Considerable Reduction ◽  
Zinc Dialkyldithiophosphate ◽  
Lubrication Mechanism ◽  
Wear Coefficient ◽  
Wear Performance ◽  
Micro Scale

Trihexyltetradecylphosphonium bis(2-ethylhexyl)phosphate (phosphonium phosphate) ionic liquid is soluble in non-polar lubricants. It has been proposed as an effective anti-wear additive comparable to zinc dialkyldithiophosphate. Previously, phosphonium phosphate has shown a better anti-wear performance under some conditions such as high temperature. In this work, the tribological performance and the lubrication mechanism of phosphonium phosphate are compared with that of zinc dialkyldithiophosphate when lubricating silicon under various tribological conditions. This can lead to an understanding of the reasons behind the superior anti-wear performance of phosphonium phosphate under some conditions. A micro-scale study is conducted using a nanotribometer. The results show that both additives lead to a considerable reduction in both friction and wear coefficients. The reduction in the wear coefficient is mainly controlled by the formation of the tribofilm on the rubbing surfaces. Zinc dialkyldithiophosphate can create a thicker tribofilm, which results in a better anti-wear performance. However, the formation of a thicker film will lead to a faster depletion and thus phosphonium phosphate can provide better anti-wear performance when the depletion of zinc dialkyldithiophosphate starts.

Ti3SiC2 – A New High Temperature Solid Self-Lubricating Additive Agent

2013 ◽  
Vol 815 ◽  
pp. 626-631
Author(s):  
Li Xin Li ◽  
Xue Quan Liu ◽  
Cun Guang Ding ◽  
Yi Li ◽  
Fa Chang Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Coefficient Of Friction ◽  
Dry Sliding ◽  
Dynamic Coefficient ◽  
Test Results ◽  
Tribological Test ◽  
Solid Additive ◽  
Lubricating Property ◽  
Pin On Disk ◽  
Dynamic Coefficient Of Friction

With the additive agent Ti3SiC2, the dry sliding behavior of Cr3C2-Ni and Cr3C2-Ni-Ti3SiC2 composites against GCr15 was investigated with a pin-on-disk tester at 400 °C in air under the load of 200N. Without Ti3SiC2, the dynamic coefficient of friction (COF) curves was fluctuated severely. After adding Ti3SiC2, the COF was decreased from 0.37 to 0.32, and the initial transition region of dynamic COF curve was shortened. These tribological test results showed that Ti3SiC2 was a new kind of solid additive agent with favorable high temperature self-lubricating property, and two possible mechanisms was proposed for its anti-friction ability.

scholarly journals Influence of micro- and nanofiller contents on friction and wear behavior of epoxy composites

2017 ◽  
Vol 24 (4) ◽  
pp. 485-494 ◽  
Author(s):  
Iskender Ozsoy ◽  
Adullah Mimaroglu ◽  
Huseyin Unal
Keyword(s):  
Fly Ash ◽  
Friction And Wear ◽  
Filler Content ◽  
Wear Behavior ◽  
Tribological Performance ◽  
Epoxy Composites ◽  
Atmospheric Conditions ◽  
Wear Rates ◽  
Pin On Disc ◽  
Worn Surface

AbstractIn this study, the influence of micro- and nanofiller contents on the tribological performance of epoxy composites was studied. The fillers are micro-Al2O3, micro-TiO2, and micro-fly ash and nano-Al2O3, nano-TiO2, and nanoclay fillers. The microfillers were added to the epoxy by 10%, 20%, and 30% by weight. The nanofillers were added to the epoxy by 2.5%, 5%, and 10%. Friction and wear tests were conducted using the pin-on-disc arrangement. Tribo elements consisted of polymer pin and DIN 1.2344 steel counterface disc. A load value of 15 N, a sliding speed of 0.4 m/s, a sliding distance of 2000 m, and dry atmospheric conditions were applied to test conditions. The results show that the friction coefficients and the specific wear rates of the nanofilled composites increase as the filler content increases. For microfiller-filled epoxy composites, these values decrease as filler content increases. The tribological performance of epoxy composites is enhanced by the addition of microfillers, and the higher enhancement is reached with the addition of 30% fly ash filler. Finally, the pin and disc worn surface images show the presence of adhesive and some abrasive wear mechanisms.

Tribological Characteristics of Coated Vane Surfaces Under Mixed Environments of Various Oils and CO2 as a Refrigerant

2005 ◽  
Author(s):  
Se-Doo Oh ◽  
Kyung-Soo Kim ◽  
Sung-Oug Cho ◽  
Young-Ze Lee
Keyword(s):  
High Pressure ◽  
Friction And Wear ◽  
Hard Coatings ◽  
Tribological Characteristics ◽  
Rotary Compressor ◽  
Wear Volume ◽  
Test Results ◽  
Sliding Surfaces ◽  
Polyalkylene Glycol ◽  
Air Conditioning Systems

The CO2 is investigated as an alternative refrigerant to replace HFC refrigerant in air conditioning systems due to the environmental concerns. Because new compressors with CO2 are going to be operated under the high pressure, the tribology of sliding surfaces in the compressor becomes very important. To develop new compressor, especially rotary type, the friction and wear characteristics of sliding surfaces between a vane and a roller in the rotary compressor were evaluated in this paper. Several hard coatings, such as TiN, CrN, WC/C and two types of nitridings, were applied on vane surfaces in order to improve the tribological characteristics, and their performances were evaluated experimentally. Two types of lubricants were used, namely POE (polyol ester) oil and PAG (polyalkylene glycol) oil. The vane-on-disk type sliding tests were performed with an exclusive high pressure wear tester. From the tests, coefficient of friction and wear volume of vane surfaces applied various coatings were compared. Test results showed that WC/C coatings showed good tribological properties. TiN and CrN coated vanes showed good wear resistance properties but produced high friction. Also, the results of the sliding tests showed that using PAG oil has an advantage over POE oil in CO2 environment.

EFFECT OF HUMIDITY ON TRIBOLOGICAL PROPERTIES OF SELECTED FRICTION JUNCTIONS WITH AN EVALUATION OF ACOUSTIC EMISSION

Tribologia ◽  
2021 ◽  
Vol 297 (3) ◽  
pp. 9-18
Author(s):  
Tomasz Desaniuk ◽  
Dominika Soboń ◽  
Wojciech Jurczak
Keyword(s):  
Relative Humidity ◽  
Friction And Wear ◽  
Sliding Mode ◽  
Operating Parameters ◽  
Linear Wear ◽  
Test Results ◽  
Tribological Test ◽  
Wear And Friction ◽  
Disc Configuration ◽  
Ball On Disc

The study aimed to compare the effect of humidity on the operation of tribological systems. The tested friction and wear are external properties; therefore, their values may differ significantly depending on the operating parameters of the friction junction and environmental conditions. Tribological tests were carried out on a TRB3 tribometer in a dry sliding mode at a relative humidity of 50% ± 5% and 90% ± 5% in the ball-on-disc configuration with a load of 15 N. The friction junction consisted of a sample made of 100Cr6 steel, and three counter-samples were made of 100Cr6, SiC, and Al2O3 steel. The geometric structure of the surface was examined with an optical profiler. The tribological test results showed reduced linear wear and friction coefficient at a relative humidity of 90% ± 5% compare to its 50% ± 5%. The paper also presents the results for the sound recorded in the 16-bit linear PCM standard and analysed in a Spectra-Plus program.

Cr doped MoS2 films: Tribological Properties, Microstructure and Electronic Structure

2021 ◽  
pp. 1-13
Author(s):  
Jian Liu ◽  
Xudong Sui ◽  
Zhen Yan ◽  
Guosheng Huang ◽  
Junying Hao
Keyword(s):  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Tribological Performance ◽  
Wear Volume ◽  
Chemical Compositions ◽  
Cross Sectional ◽  
X Ray ◽  
Wear Life ◽  
Target Power ◽  
Worn Surface

Abstract Cr doped MoS2 films were deposited by magnetron sputtering. The tribological properties of Cr doped MoS2 films under vacuum (VC) and air (AR) environments were investigated. The results show that Cr doped MoS2 film with Cr target power of 0.2 A (0.2 A Cr:MoS2 film) exhibits low friction coefficient and long wear life under both VC and AR environments. The chemical compositions of the films were analyzed by energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). With the increases of Cr target power, the content of Cr increases. The cross-sectional FESEM morphologies show that the structure of the films changed from granular particles to column when the Cr target power increases from 0.2A to 0.4A. The wear mechanism has also been discussed based on the characteristics of worn surface. The 0.4 A Cr:MoS2 film has the lowest wear volume among these films, which can be attributed to the compact microstructure. The bandgap of Cr doped MoS2 films were measured by XPS and the tribological performance of the film is found to be best when there is a modest bandgap. It can be speculated that the tribological performance of Cr doped MoS2 films are closely related to the width of bandgap.

Effect of Ultrasonic Vibration on the Friction and Wear Properties of GCr15/45# Steel Frictional Pairs Lubricated by n-Al2O3 Additives

2012 ◽  
Vol 538-541 ◽  
pp. 1920-1923
Author(s):  
Yu Lin Qiao ◽  
Shan Lin Yang ◽  
Yan Zang ◽  
Xin Yu Dong ◽  
Qing Sheng Cui
Keyword(s):  
Friction Coefficient ◽  
Ultrasonic Vibration ◽  
Photoelectron Spectroscopy ◽  
Friction And Wear ◽  
Ball Bearing ◽  
Wear Scar ◽  
Friction Reduction ◽  
Wear Volume ◽  
Wear Properties ◽  
Friction And Wear Properties

The friction and wear properties of GCr15/45# steel frictional pairs lubricated by n- Al2O3 additives under ultrasonic vibration or not were studied. The scanning electron microscope(SEM), X-ray photoelectron spectroscopy(XPS) and energy dispersive spectrometer (EDS) were carried out to analyse the wear scar surface. The effect mechanism of ultrasonic vibration on friction pairs was discussed. The results indicated that ultrasonic vibration could decrease the friction and wear of GCr15/45# friction pairs, when the content of n-Al2O3 was 0.5wt%, the effect of ultrasonic vibration on friction pairs was most obvious. The friction coefficient, wear volume and wear scar depth under ultrasonic vibration decreased 10%, 34% and 13%, respectively. The friction reduction and anti-wear mechanism of n-Al2O3 was single “micro ball bearing” without ultrasonic vibration, and it changed to “micro ball bearing” and adsorption penetration film with ultrasonic vibration, so the friction coefficient and wear volume was reduced.

Synthesis, Characterization, and Tribological Studies of Calcium–Copper–Titanate Nanoparticles as a Biolubricant Additive

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Rajeev Nayan Gupta ◽  
A. P. Harsha
Keyword(s):  
Castor Oil ◽  
Tribological Performance ◽  
Optimum Concentration ◽  
Test Results ◽  
Extreme Pressure ◽  
Zinc Dialkyldithiophosphate ◽  
Tribological Test ◽  
Calcium Copper Titanate ◽  
The Coefficient Of Friction ◽  
Analytical Tools

In the present study, tribological properties of castor oil have been investigated with and/or without use of additives by using four-ball tester. In the base castor oil, calcium–copper–titanate nanoparticles (CCTO) and zinc dialkyldithiophosphate (ZDDP) were added in different concentrations (i.e., 0.1, 0.25, 0.5, and 1.0 w/v%) to study their individual effect on tribological performance. Tribological test results have shown that there is an improvement in the antiwear, extreme-pressure (EP) properties at 0.25 and 1.0 w/v% for both the additives, respectively. However, in the coefficient of friction (COF) test (incipient seizure load), an optimum concentration of 0.5 w/v% was observed for ZDDP additive, whereas CCTO nanoparticles have shown similar level of performance at all concentrations. The worn-out surfaces were analyzed by using different analytical tools.

Pristine and Alkylated MoS2 Nanosheets for Enhancement of Tribological Performance of Paraffin Grease Under Boundary Lubrication Regime

2019 ◽  
Vol 141 (7) ◽  
Author(s):  
Sooraj S. Rawat ◽  
A. P. Harsha ◽  
Deepak P. Agarwal ◽  
Sangita Kumari ◽  
Om P. Khatri
Keyword(s):  
Coefficient Of Friction ◽  
Tribological Performance ◽  
Wear Volume ◽  
Mos2 Nanosheets ◽  
Lubricating Grease ◽  
Metal Soap ◽  
Paraffin Oil ◽  
Lubrication Regime ◽  
The Coefficient Of Friction ◽  
Worn Surface

In the present study, lubricating grease was developed with paraffin oil and 12-lithium hydroxy stearate metal soap as a thickening agent. MoS2 nanosheets were synthesized by hydrothermal method and functionalized with 1-octadecanethiol (i.e., MoS2-ODT). The MoS2 and MoS2-ODT nanosheets were dispersed in the grease with different concentrations to evaluate its tribological performance. Tribological results unveiled that the addition of MoS2 nanosheets in grease appreciably reduced the coefficient of friction and mean wear volume of tribo-interfaces as compared with pure grease. Energy dispersive spectroscopy (EDS) spectrum revealed the deposition of MoS2 on the worn surface and confirmed a thin tribo-film which protects steel tribo-pair against wear.

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