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

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.

Download Full-text

Renovate Tribological Properties of Nanostructured Alumina Templates by Diverse Electrolytes

Advanced Science Engineering and Medicine ◽

10.1166/asem.2020.2619 ◽

2020 ◽

Vol 12 (6) ◽

pp. 806-809

Author(s):

Ghanshyam Dass ◽

Anil Kumar ◽

Manoj Kumar Kushwaha

Keyword(s):

Wear Resistance ◽

Pore Structure ◽

Tribological Properties ◽

Energy Dispersive Spectroscopy ◽

Friction And Wear ◽

Applied Load ◽

Energy Dispersive ◽

Pore Density ◽

Wear Properties ◽

Friction And Wear Properties

Friction and wear properties of NAAO templates were calculated in affinity to pore dimensions and applied load. Homogeneously uniformly decorative synthesized by anodization of nanoporous aluminium oxide films having 65–95 μm thick and pores of 143.5, 105, 84.4 nm diameter. A tribological competency of the material checked out with loads and 250 rpm on the pin on a dry wear disc. The anodized NAAO sample has wear resistance increased by 25% as compared to the non-anodized sample. The pore density little bit impressed the frictional characters of NAAO template. We counsel that these course templates basically contribute to the reduction of friction distrait the pore structure by proving energy-dispersive spectroscopy (EDS).

Download Full-text

Improvement of the Dry Friction and Wear Properties of the Si/SiC by Doping with Ni and PbO

Materials Science Forum ◽

10.4028/www.scientific.net/msf.658.456 ◽

2010 ◽

Vol 658 ◽

pp. 456-459

Author(s):

Ke Zheng Sang ◽

Wen Chao Wang ◽

Gang Qiang Geng

Keyword(s):

Silicon Carbide ◽

Wear Resistance ◽

Dry Friction ◽

Lead Oxide ◽

Friction And Wear ◽

Sintering Process ◽

Wear Properties ◽

Dry Conditions ◽

Friction And Wear Properties ◽

Pin On Disk

The composite of silicon carbide with nickel and lead oxide was prepared by reaction sintered method. The phase compositions of the composites were studied by XRD, SEM and EDX. Friction and wear properties of the composites in dry conditions at the temperatures 15°C, 300°C and 600°C were tested using a pin-on-disk tribometer. The results showed that NiSi2 was formed and located between the SiC particles during sintering process. However the PbO was remained and distributed uniformly in the composites besides a little of Pb4SiO6 were formed. Friction coefficient of the composites decreased with the increase of the temperature and was about 0.2 at 600°C. And wear resistance of the composites was improved at all test temperatures comparing with that of the Si/SiC.

Download Full-text

Influence of MoS2 on the Microstructures and Properties of Ni-Based Alloying Coating

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.130-134.1276 ◽

2011 ◽

Vol 130-134 ◽

pp. 1276-1280

Author(s):

Bin Han ◽

Min Peng Xue ◽

Wang Yong ◽

Meng Fei Yu

Keyword(s):

Composite Coating ◽

Laser Cladding ◽

Tribological Properties ◽

Dry Friction ◽

Friction And Wear ◽

Composite Coatings ◽

Wear Properties ◽

Friction And Wear Properties ◽

Different Content ◽

1045 Steel

Ni/MoS2composite coatings with different content of MoS2were produced on the surface of 1045 steel by laser cladding technology. SEM and EPMA were used to analyze the microstructures and micro area compositions of the coatings. Dry friction and wear properties of the coatings were tested by friction and wear tester. The results indicate that the microstructures of Ni/MoS2composite coating are large quantities of different-form white silicides and black sulfides distributing on the substrate. The sulfides mainly consist of CrxSy, MoS2and FeS. When the content of MoS2is 9%, Ni/MoS2composite coating exhibits best tribological properties.

Download Full-text

Amorphous Carbon Coatings for Locally Adjusted Tribological Properties in Sheet Bulk Metal Forming

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.504-506.969 ◽

2012 ◽

Vol 504-506 ◽

pp. 969-974 ◽

Cited By ~ 1

Author(s):

Harald Hetzner ◽

Stephan Tremmel ◽

Sandro Wartzack

Keyword(s):

Amorphous Carbon ◽

Tribological Properties ◽

Metal Forming ◽

Friction And Wear ◽

Wear Properties ◽

Carbon Coatings ◽

Bulk Metal ◽

Bulk Metal Forming ◽

Friction And Wear Properties ◽

Amorphous Carbon Coatings

In sheet bulk metal forming, locally adapted friction properties of the contact tool/workpiece are an appropriate means for the targeted enhancement of the material flow, enabling an improved form filling and lowered forming forces. However, the implementation of desirable friction conditions is not trivial. And further, friction is inseparably linked to wear and damage of the contacting surfaces. This calls for a methodological approach in order to consider tribology as a whole already in the early phases of process layout, so that tribological measures which allow fulfilling the requirements concerning local friction and wear properties of the tool surfaces, can already be selected during the conceptual design of the forming tools. Thin tribological coatings are an effective way of improving the friction and wear properties of functional surfaces. Metal-modified amorphous carbon coatings, which are still rather new to the field of metal forming, allow tackling friction and wear simultaneously. Unlike many other types of amorphous carbon, they have the mechanical toughness to be used in sheet bulk metal forming, and at the same time their friction properties can be varied over wide ranges by proper choice of the deposition parameters. Based on concrete research results, the mechanical, structural and special tribological properties of tungsten-modified hydrogenated amorphous carbon coatings (a-C:H:W) are presented and discussed against the background of the tribological requirements of a typical sheet bulk metal forming process.

Download Full-text

Dry Friction and Wear Properties of Aluminum Matrix Composites Reinforced with 3D Network Ceramics

High-Performance Ceramics III - Key Engineering Materials ◽

10.4028/0-87849-959-8.1701 ◽

2007 ◽

pp. 1701-1704 ◽

Cited By ~ 2

Author(s):

Junping Yao ◽

Wei Wang ◽

Leping Chen ◽

Bing Kun Chen ◽

Lei Zhang

Keyword(s):

Dry Friction ◽

Friction And Wear ◽

Aluminum Matrix ◽

Aluminum Matrix Composites ◽

Matrix Composites ◽

Wear Properties ◽

3D Network ◽

Friction And Wear Properties

Download Full-text

Effects of Reduced Graphene Oxide (rGO) at Different Concentrations on Tribological Properties of Liquid Base Lubricants

Lubricants ◽

10.3390/lubricants7020011 ◽

2019 ◽

Vol 7 (2) ◽

pp. 11 ◽

Cited By ~ 6

Author(s):

Jankhan Patel ◽

Amirkianoosh Kiani

Keyword(s):

Graphene Oxide ◽

Physical Properties ◽

Reduced Graphene Oxide ◽

Tribological Properties ◽

High Speed ◽

Friction And Wear ◽

Control Sample ◽

Wear Properties ◽

Reduced Graphene ◽

Friction And Wear Properties

In this study, reduced graphene oxide (rGO) nano platelets were used as an additive to enhance friction and wear properties of oil-based lubricants by preparing three samples at 0.01% w/w, 0.05% w/w, and 0.1% w/w concentrations. To analyze the direct effect of rGO nano platelets on tribological properties, 99.9% pure oil was used as a liquid lubricant. A comparative tribological study was done by performing a ball-on-disk wear test in situ under harsh conditions, which was further analyzed using a non-contact 3D optical profilometer. Morphological evaluation of the scar was done using transmission and scanning electron microscopy (TEM, SEM) at micro and nano levels. The lubricants’ physical properties, such as viscosity and oxidation number, were evaluated and compared for all samples including pure oil (control sample) as per ASTM standards. Findings of all these tests show that adding rGO nano platelets at 0.05% w/w showed significant reduction in friction at high speed and in wear up to 51.85%, which is very promising for increasing the life span of moving surfaces in machinery. Oxidation and viscosity tests also proved that adding rGO nano platelets to all samples does not sacrifice the physical properties of the lubricant, while it improves friction and wear properties.

Download Full-text

Friction and Wear of MoS2 Films on Etched Steel Surfaces

Volume 3: Design; Tribology; Education ◽

10.1115/esda2008-59076 ◽

2008 ◽

Author(s):

V. Perfilyev ◽

A. Moshkovich ◽

K. Lutudjean ◽

L. Rapoport

Keyword(s):

Chemical Treatment ◽

Friction And Wear ◽

Steel Surface ◽

Solid Lubricant ◽

Surface Texturing ◽

Roughness Parameters ◽

Wear Properties ◽

Wear Life ◽

Steel Surfaces ◽

Friction And Wear Properties

Surface texturing is one of modern technologies using for improvement friction and wear properties of rubbed surfaces. The simple and effective methods of surface texturing are mechanical or chemical treatments of friction surfaces. In this work we deal with chemical treatment of steel surfaces with following filling the profile by solid lubricant particles as MoS2. The steel surfaces were etched with phosphoric acid. The effect of time and temperature of etching on the surface roughness parameters was studied. Some standard roughness parameters of etched surface were measured. It was found that the parameters of roughness as Rz and Sm characterizing the depth of valleys and their size can be used for description of etched surfaces. Optimal parameters, Rz and Sm, providing the best tribological properties were determined: Rz = 5 ∼ 7 m and Sm = 50–70 m. The thickness of solid lubricant film was about 1 m. Finally, the tribological properties of MoS2 films on the steel surfaces textured by chemical treatment were performed. The friction coefficient and wear life of solid lubricant films was assessed. Friction and wear properties of MoS2 films on etched surfaces were compared with similar films on virgin steel surface. The wear life of MoS2 films on etched surfaces was 5–7 times larger than for solid lubricant film on mechanically treated steel surface.

Download Full-text

Effect of temperature and mating pair on tribological properties of DLC and GLC coatings under high pressure lubricated by MoDTC and ZDDP

Friction ◽

10.1007/s40544-020-0420-1 ◽

2020 ◽

Author(s):

Kang Liu ◽

Jia-jie Kang ◽

Guang-an Zhang ◽

Zhi-bin Lu ◽

Wen Yue

Keyword(s):

Tribological Properties ◽

Friction And Wear ◽

Effect Of Temperature ◽

Wear Properties ◽

Dlc Coatings ◽

Base Oil ◽

Two Temperatures ◽

Friction And Wear Properties ◽

Lubrication Conditions ◽

Better Than

AbstractDiamond-like carbon (DLC) and graphite-like carbon (GLC) coatings have good prospects for improving the surface properties of engine parts. However, further understanding is needed on the effect of working conditions on tribological behaviors. In this study, GLC and two types of DLC coatings were deposited on GCr15 substrate for investigation. The friction and wear properties of self-mated and steel-mated pairs were evaluated. Two temperatures (25 and 90 °C), three lubrication conditions (base oil, molybdenum dithiocarbamate (MoDTC)-containing oil, MoDTC+zinc dialkyldithiophosphate (ZDDP)-containing oil), and high Hertz contact stress (2.41 GPa) were applied in the experiments. The results showed that high temperature promoted the effect of ZDDP on steel-mated pairs, but increased wear under base oil lubrication. The increased wear for steel-mated pairs lubricated by MoDTC-containing oil was due to abrasive wear probably caused by MoO3 and β-FeMoO4. It was also found that in most cases, the tribological properties of self-mated pairs were better than those of steel-mated pairs.

Download Full-text

Preparation and Tribological Properties of Nb1-xTixSe2 Micro/Nanoparticles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.619.536 ◽

2012 ◽

Vol 619 ◽

pp. 536-540

Author(s):

Jia Qing Liang ◽

Chang Sheng Li ◽

Hua Tang ◽

Yi Zhang ◽

Wen Jing Li ◽

...

Keyword(s):

Tribological Properties ◽

Friction And Wear ◽

Sliding Friction ◽

Layer Structure ◽

Nano Particles ◽

Wear Properties ◽

Repair Work ◽

X Ray ◽

Friction And Wear Properties ◽

Antiwear Ability

Nb1-xTixSe2(x=0～1) micro/nano-particles have been successfully prepared via solid-state thermal (750°C) reaction between microsized Nb, Ti with Se powders under seal environment in a seal quartz tube and characterization by X-ray diffractometer and scanning electron microscopy. It was found that the morphologies of the as-prepared products changed from microplates to micro-nanoparticles or aggregations composed of layer structure with the doping of Ti. And the amount of regular hexagonal microplates evidently reduced and nanoscaled particles increased with the increase of the contents of Ti dopant within a certain limit (1-20 atwt. %). The tribological properties of the as-prepared products as additives in paraffin were investigated by UMT-2 multispecimen tribotester. By the addition of Nb1-xTixSe2micro/nanoparticles in paraffin, the antiwear ability was improved and the friction coefficient was decreased. The paraffin with Nb1-xTixSe2micro/nanoparticles showed better tribological properties than that with pure NbSe2. A combination of the molecule-bearing mechanism of sliding friction, and fill in-repair work between the rubbing surfaces can explain the good friction and wear properties of Nb1-xTixSe2micro/nanoparticles.

Download Full-text