scholarly journals Study of tribological properties of epoxy and resins composites under technically dry friction conditions

2018 ◽  
Vol 19 (12) ◽  
pp. 658-661
Author(s):  
Sylwester Stawarz ◽  
Magdalena Stawarz ◽  
Robert Gumiński ◽  
Wojciech Kucharczyk
Keyword(s):  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Dry Friction ◽  
Friction And Wear ◽  
Surface Condition ◽  
Selective Transfer ◽  
X Ray ◽  
Tribological Tests ◽  
Transfer Phenomenon ◽  
The Coefficient Of Friction

The article discusses the results of tribological tests of epoxy and resol composites. There was examined the surface condition of samples of composites operating in sliding nodes. It has been found that it is possible to use cheaper resole resins for sliding composites (instead of Epidian 5). Tests that have been carried out showed that increasing the PTFE content in the composite resulted in lowering both the coefficient of friction and wear. X-ray analysis results con-firmed the occurrence of the selective transfer phenomenon

Some Tribological Properties of an Ionic Liquid

2005 ◽  
Author(s):  
Takashi Nogi
Keyword(s):  
Ionic Liquid ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Wear Performance ◽  
Lubrication Regime ◽  
Pin On Disc ◽  
The Coefficient Of Friction

Some tribological properties of an ionic liquid were investigated by using a pin-on-disc friction and wear tester. Due to running-in, the coefficient of friction of the ionic liquid decreased with time to a very low value of 0.02 which suggests that the lubrication regime was hydrodynamic at the end of the tests. Anti-wear performance of the ionic liquid was substantially comparable to a paraffin-based oil.

Conductive capacity and tribological properties of several carbon materials in conductive greases

2016 ◽  
Vol 68 (5) ◽  
pp. 577-585 ◽  
Author(s):  
Zhengfeng Cao ◽  
Yanqiu Xia ◽  
Xiangyu Ge
Keyword(s):  
Electron Microscope ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Volume Resistivity ◽  
Lubricant Additive ◽  
Step Method ◽  
Content Type ◽  
X Ray ◽  
The Coefficient Of Friction ◽  
Complex Lithium

Purpose The purpose of this paper is to synthesize a new kind of conductive grease which possesses a prominent conductive capacity and good tribological properties. Design/methodology/approach A two-step method was used to prepare complex lithium-based grease. Ketjen black (KB), acetylene black (AB) and carbon black (CB) were characterized by transmission electron microscope and used as lubricant additives to prepare conductive greases. Conductive capacity was evaluated by a conductivity meter, a surface volume resistivity meter and a circuit resistance meter. Tribological properties were investigated by a reciprocating friction and wear tester (MFT-R4000). The worn surfaces were analyzed by a scanning electron microscope, Raman spectroscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscope. Findings The conductive grease prepared with KB has a prominent conductive capacity at room temperature, 100°C and 150°C. Further, this conductive grease also possesses better tribological properties than AB and KB greases. When the concentration of KB is 1.8 Wt.%, the coefficient of friction and wear width reduced by 11 and 14 per cent, respectively. Originality/value This work is a new application of nanometer KB as a lubricant additive in grease, which provides a direction for preparing conductive grease. The conductivity and tribology experiments have been carried out though the variation of experiment conductions.

The influence of laser surface texture on the tribological properties of friction layer materials in ultrasound motors

2021 ◽  
pp. 135065012110527
Author(s):  
Xijun Hua ◽  
Julius Caesar Puoza ◽  
Peiyun Zhang
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Dry Friction ◽  
Friction And Wear ◽  
Ultrasonic Motor ◽  
Area Ratio ◽  
Ultrasonic Motors ◽  
Increase Rate

Ultrasonic motors are typically driven by the dry friction force between the rotor and the stator; the friction pairs’ high friction coefficient and low wear rate are two essential elements for improving the operational stability with longer service life. In this research article, high-precision microgroove arrays were manufactured on the surfaces of the stator and rotor of the TRUSM60 ultrasonic motor using laser machining. Dry friction and wear tests between the stator and the rotor were carried out with pin-on-disc using HSR-2M high-speed reciprocating friction and wear tester to determine the tribological properties of the ultrasonic motor. According to a different distribution of microgrooves on the two contact surfaces, the influence of smooth surface, single-sided texture, and double-sided texture on the friction pair's friction performance were discussed. The results show that the textured surface can substantially increase the coefficient of friction of the contact surface and reduce the rate of wear. The one-sided textured phosphor bronze surface with a microgroove width of 200μm and an area ratio of 20% had the highest coefficient of friction of 0.334 and a friction increase rate of 36.3%. Similarly, the single-sided textured Polyimide surface attained the highest friction coefficient of 0.355 and friction increase rate of 44.9% when the groove width is 150μm and the area ratio is 30%. A higher friction coefficient of the double-sided texture can be obtained through reasonable parameter configuration than the single-sided texture. The included angle of 0° between the two textured surfaces produced the highest friction coefficient of 0.368 and the wear rate of the phosphor bronze and polyimide surfaces were 2.01 × 10−4 mm3/N-m and 1.949 × 10−3 mm3/N-m, respectively. The result provides an essential benchmark for enhancing the tribological performance of ultrasonic motors and increasing the output torque.

Research of the effect of shot peening vibro-abrasive machining on the properties of the steel NC11LV

Mechanik ◽  
2017 ◽  
Vol 90 (1) ◽  
pp. 74-75
Author(s):  
Sławomir Spadło ◽  
Damian Bańkowski ◽  
Joanna Kowalczyk
Keyword(s):  
Coefficient Of Friction ◽  
Shot Peening ◽  
Friction And Wear ◽  
Abrasive Machining ◽  
Tribological Tests ◽  
Working Medium ◽  
The Coefficient Of Friction ◽  
Relationship Of ◽  
The Relationship

The article presents the results of the effect of vibro-abrasive machining using as a working medium balls of steel-check on the properties of disks made of steel NC11 (X160CrMoV121). Tribological tests using the tester T-01 made it possible to determine the relationship of time of shot peening on the coefficient of friction and wear linear-in. They were presented typical consumption profiles.

MODIFICATION OF THE SURFACE LAYER OF SINTERED DUPLEX STAINLESS STEELS THROUGH ALLOYING USING THE GTAW METHOD

Tribologia ◽  
2018 ◽  
Vol 278 (2) ◽  
pp. 81-88 ◽  
Author(s):  
Barbara LISIECKA ◽  
Agata DUDEK
Keyword(s):  
Surface Layer ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Surface Alloying ◽  
Two Phase ◽  
X Ray ◽  
The Coefficient Of Friction ◽  
Effect Of Surface ◽  
Modification Of The Surface ◽  
Nial Powder

The demand for materials obtained using powder metallurgy (PM) is constantly increasing, especially on SDSSs, which are characterized by a two–phase structure consisting of ferrite and austenite. The main purpose of this study was to examine the effect of surface layer alloying with chromium carbide on the microstructure and tribological properties (e.g., hardness and wear resistance) of SDSSs. The multiphase sinters were prepared from two types of water–atomized steel powders: 316L and 409L. The technique of the APS method was used to deposit Cr3C2–NiAl powder on the SDSS surface. Electric arc (GTAW method) was used for surface alloying. Optical and scanning microscopy, X–ray phase analysis, and examinations of microhardness and coefficient of friction were performed in order to determine the microstructure and basic properties of SDSS after alloying. The surface alloying with Cr3C2 improves tribological properties of SDSSs such as hardness and the coefficient of friction.

Effect of artificial aging on the tribological properties of an Al-25Zn-1Mg alloy

2021 ◽  
Vol 63 (9) ◽  
pp. 836-841
Author(s):  
Recai Fatih Tunay ◽  
Hayder Isam Abdulzahra Al Saadi
Keyword(s):  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Dry Friction ◽  
Aging Process ◽  
Artificial Aging ◽  
Solution Treatment ◽  
Process Solution ◽  
Test Speed ◽  
The Coefficient Of Friction ◽  
Increasing Load

Abstract The tribological properties of aluminum based Al-25Zn-1Mg alloy was experimentally investigated in an MSc thesis, and the results are presented in this study. To this purpose, Al-25Zn-1Mg was commercially produced by casting. The prepared samples were divided into seven groups: no-process, solution treatment, and artificial aging for 1, 3, 6, 12 and 24 hours. Aged and untreated samples were subjected to tribological experiments under conditions of dry friction under 5 N and 10 N loads at speed of 200 rpm, 400 rpm and 800 rpm for a distance of 500 m. As a result of the tests, it was found that hardness increases in all samples depending on the aging process. It was also found that when the test speed was kept constant, the coefficient of friction increased with increasing load.

Paper 1: Application of Friction and Wear Results Obtained on a Pin–Disc Machine to the Ring–Traveller Problem

1967 ◽  
Vol 182 (14) ◽  
pp. 1-10
Author(s):  
D. G. Powell ◽  
S. W. E. Earles
Keyword(s):  
Wear Rate ◽  
Surface Temperature ◽  
Coefficient Of Friction ◽  
Friction And Wear ◽  
Surface Condition ◽  
Surface Films ◽  
Ring Radius ◽  
The Coefficient Of Friction ◽  
Steel Surfaces ◽  
Disc Configuration

An experimental study of the dependence of the coefficient of friction and rate of wear of unlubricated steel surfaces in a pin–disc configuration has suggested the use of certain parameters involving normal force, N, and sliding speed, U, in correlating the effects of surface temperature and surface condition with both friction and wear. The interpretation of these functions in terms of the parameters of the ring–traveller problem suggests that the coefficient of friction can be expressed as a function of U2 √(traveller mass/ring radius) and the traveller wear rate is directly proportional to √ (traveller mass/ring radius) providing that sliding conditions are chosen to produce a constant value of surface temperature. This last conclusion is restricted by the previous observation that beyond a certain critical temperature periodic removal of the self-generated surface films occurs. This causes a large increase in the values of both coefficient of friction and wear rate and it is suggested therefore that the ‘temperature instability’ of the surface oxide films may possibly be the prime cause of excessive yarn breakages, and overheated travellers after long periods of operation. An end-breakage criterion is proposed. Previously published results of the friction and wear measured in ring–traveller mechanisms are re-interpreted in the light of the parameters suggested by the present work.

scholarly journals Influence of Beam Power on Young’s Modulus and Friction Coefficient of Ti–Ta Alloys Formed by Electron-Beam Surface Alloying

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1246
Author(s):  
Stefan Valkov ◽  
Dimitar Dechev ◽  
Nikolay Ivanov ◽  
Ruslan Bezdushnyi ◽  
Maria Ormanova ◽  
...  
Keyword(s):  
Electron Beam ◽  
Young’S Modulus ◽  
Coefficient Of Friction ◽  
Young's Modulus ◽  
Beam Power ◽  
Surface Alloying ◽  
Surface Alloys ◽  
X Ray ◽  
The Coefficient Of Friction ◽  
Beam Surface

In this study, we present the results of Young’s modulus and coefficient of friction (COF) of Ti–Ta surface alloys formed by electron-beam surface alloying by a scanning electron beam. Ta films were deposited on the top of Ti substrates, and the specimens were then electron-beam surface alloyed, where the beam power was varied from 750 to 1750 W. The structure of the samples was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). Young’s modulus was studied by a nanoindentation test. The coefficient of friction was studied by a micromechanical wear experiment. It was found that at 750 W, the Ta film remained undissolved on the top of the Ti, and no alloyed zone was observed. By an increase in the beam power to 1250 and 1750 W, a distinguished alloyed zone is formed, where it is much thicker in the case of 1750 W. The structure of the obtained surface alloys is in the form of double-phase α’and β. In both surface alloys formed by a beam power of 1250 and 1750 W, respectively, Young’s modulus decreases about two times due to different reasons: in the case of alloying by 1250 W, the observed drop is attributed to the larger amount of the β phase, while at 1750 W is it due to the weaker binding forces between the atoms. The results obtained for the COF show that the formation of the Ti–Ta surface alloy on the top of Ti substrate leads to a decrease in the coefficient of friction, where the effect is more pronounced in the case of the formation of Ti–Ta surface alloys by a beam power of 1250 W.

Friction and Wear Behaviors of Solid Lubricants/Polyimide Composites in Liquid Mediums

2010 ◽  
Vol 654-656 ◽  
pp. 2763-2766 ◽  
Author(s):  
Li Wen Mu ◽  
Xin Feng ◽  
Yi Jun Shi ◽  
Huai Yuan Wang ◽  
Xiao Hua Lu
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Alkaline Solution ◽  
Dry Friction ◽  
Friction And Wear ◽  
Solid Lubricants ◽  
Polyimide Composites ◽  
Inorganic Fillers ◽  
Ptfe Composites

The tribological properties of polyimide (PI) composites reinforced with graphite or MoS2 sliding in liquid alkali and water as well as dry friction were investigated using a ring-on-ring tester. The results show that the friction coefficient (μ) and wear rate (W) for both graphite/PI and MoS2/PI composites in different liquid mediums are μdry>μwater >μalkali and Wwater>Wdry >Walkali. Results also indicate that the friction coefficient and wear rate of the PI composites filled with different solid lubricants are μMoS2 >μgraphite and W MoS2 >Wgraphite in different liquid mediums. In addition, the hydrophobic inorganic fillers are fit for the reinforcement of polymer-based composites sliding in liquid mediums. It is also concluded from the authors’ work that the wear rate and friction coefficient of polymer-based (such as PI, PTFE) composites in the alkali lubricated conditions is lowest among all the friction conditions. This may be attributed to the ionic hydration in the alkaline solution.

Tribological properties of the epoxy resin-based solid lubricant coating modified by Kevlar fibers

2018 ◽  
Vol 70 (9) ◽  
pp. 1706-1713 ◽  
Author(s):  
Guotao Zhang ◽  
Yanguo Yin ◽  
Ting Xie ◽  
Dan Li ◽  
Ming Xu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Epoxy Resin ◽  
Tribological Properties ◽  
Dry Friction ◽  
Friction And Wear ◽  
Solid Lubricant ◽  
Transfer Film ◽  
Wear Properties ◽  
Content Type ◽  
Friction And Wear Properties

Purpose This paper aims to obtain high mechanical and good tribological properties of epoxy resin-based coatings under dry friction conditions. Design/methodology/approach Bonded solid lubricant coatings containing Kevlar fibres were prepared by a spraying method. The friction and wear properties of the coatings were experimentally investigated with a face-to-face tribometre under dry friction conditions. Scanning electron microscopy, energy dispersive X-ray spectroscopy and 3D laser scanning technologies were used to characterise the tribological properties. The action mechanism of the Kevlar fibres on a solid lubricant transfer film was also analysed. Findings Adding Kevlar fibres can significantly improve the wear resistance of the coatings. When the Kevlar fibre content increases, the tribological properties of the coatings improve and then worsen. Superior properties are obtained with 0.03 g of Kevlar fibres. Appropriately increasing the load or speed is beneficial to the removal of the outer epoxy resin and the formation of a lubricant film. During friction, the solid lubricants wrapped in the epoxy resin accumulate on the surface to form a transfer film that shows a good self-lubricating performance. In the later friction stage, fatigue cracks occur on the solid lubricant film but cannot connect to one another because of the high wear resistance and the entanglement of the rod-like Kevlar fibres. Thus, no large-area film falls from the matrix, thereby ensuring the long-term functioning of solid lubricant coatings. Originality/value Epoxy resin-based solid lubricant coatings modified by Kevlar fibres were prepared, and their friction and wear properties were investigated. Their tribological mechanisms were also proposed. This work provided a basis for the analysis of the tribological properties and design of bonded solid lubricant coatings containing Kevlar fibres.

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