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MoS x thin films were deposited by ion beam enhanced deposition (IBED) and magnetron sputtering (MS) onto the surface of IBED Si 3 N 4 and TiN thin films. The friction and wear performances of thin films and 52100 steel were compared using an SRV model reciprocating testing machine. The results showed that all MoS x films exhibit good tribological behavior. The MS MoS...
Because of their layered structure featuring a sulfur atom double layer bound by van der Waals forces, tantalum and niobium carbosulfides were proposed as solid lubricants. Carbosulfides with high homogeneity and controlled purity have been prepared by combustion synthesis. By means of a two-line tribometer, the tribological properties of bulk Ta 2 S 2 C, (Ta,Nb) 2 S 2...
Hexagonal boron nitride (BN) has a graphite-like lamellar structure, but has been considered less effective than other solid lubricants except for high-temperature applications. The present paper describes a series of sliding experiments which show somewhat curious behavior of BN when added to lubricating oil, and discusses their results by comparing with the results of observation and analysis of...
The effects of water base lubricants on wear of coated tools are examined by a crossed-cylinder wear test from environmental protection viewpoint. The lubricating property of pure water is inadequate. However, the addition of solid lubricant (melamine cyanuric acid adduct, MCA) to water, shows good tribological performance. Such a mixture provides the advantage of separating solid components from...
In the past few years, WS 2 and MoS 2 nanoparticles (IF) with structures closely related to (nested) carbon fullerenes and nanotubes have been synthesized. It was shown before that addition of a small amounts of such nanoparticles to lubricating fluid largely improve the tribological properties of contact surfaces. In the present work, impregnation of the nanoparticles into a porous...
The impregnation of inorganic fullerene-like nanoparticles of WS 2 (IF) allows to improve effectively the tribological properties of powdered materials in comparison to the impregnation of oil or commercially available layered WS 2 (2H) particles. The main goal of this work was to determine the dominant lubrication regimes under friction of the bronze, iron, and iron-nickel porous...
Alumina/aluminum based composites with excellent physical and mechanical properties offer great potential for lightweight, wear resistant, and high temperature applications. The objective of the present research was to investigate a suitable coating material to provide a low coefficient of friction (COF) during sliding contact. The friction behavior of carbon nanofiber-reinforced aerospace polymer...
The use of polymer laminated steels have received significant interest from the can-making industry as a potential base material, mainly due to environmental benefits and excellent solid lubrication properties. Internal corrosion prevention is also very important with food cans. Previous research has experimentally and mathematically analyzed this material, but the mechanical properties, especially...
Nickel oxythiomolybdate (NiMoO 2 S 2 ) nanoparticles with an average size of 13nm were synthesized in the microemulsion system of sodium dodecyl-sulphate (SDS)/isopentanol/cyclohexanene/water. The tribological performances of the prepared NiMoO 2 S 2 nanoparticles as a lubricating additive were evaluated in four-ball wear tester and a pin-on-disc tester at elevated...
Two kinds of composite ceramics are obtained by impregnating the porous SiC with melted fluorides and nickel. Using a pin-on-disk tribometer, the unlubricated tribological properties at temperatures of 15, 300 and 600 o C are investigated for the composite ceramics. The results show that the composite ceramics exhibit self-lubricating property at 600 o C. Meanwhile, micro-fracture...
Analysis of wear mechanisms of prehistoric materials are fundamental in many aspects for archaeology to determine their use within a given socio-economic context. Wear test methods have brought significant contributions to the identification of prehistoric tools implemented for the manufacture of stone objects such as vessels, figurines or pendants during the VIIth millennium bc, in Cyprus. Manual...
Friction and wear of powder materials impregnated with commercially available layered (platelets) WS 2 (2H) and inorganic fullerene-like WS 2 nanoparticles (IF) were studied. Bronze-graphite, iron-graphite and iron-nickel-graphite samples were used in this experiment. The linear wear of powder materials (in situ) was measured. It was shown that the IF nanoparticles impregnated into...
The tribological characteristics of a 0.3nm thick silver film on an Si (111) 7x7 surface in sliding contact with diamond have been studied as a function of the substrate temperature in an ultrahigh vacuum (UHV) environment. The morphological change of the Ag film at elevated substrate temperatures was observed in situ reflection high-energy electron diffraction (RHEED). The morphology of the Ag film...
The tribological properties of Ag films with a wide range of thicknesses on an Si(111)-7x7 surface have been studied using a pin-on-plate type tribometer under ultrahigh-vacuum (UHV) conditions. Reflection high-energy electron diffraction (RHEED) patterns show that the Ag film deposited on an Si(111)-7x7 surface at room temperature (RT) forms a two-dimensional fiber crystal structure and gradually...
Fullerene-like WS 2 (MoS 2 ) nanoparticles (IF) have been studied in the past. It was shown that the IF nanopaticles appear to form a protective film allowing increased load capacity of the rubbed pairs under mixed lubrication. The main objective of the present work is to evaluate the behavior of the IF nanoparticles under severe contact conditions—the transition to seizure. The effect...
The effect of shot-peening treatment with the particulate MoS 2 solid lubricant on the wear resistance of steel in the dry rolling/sliding contact wear tests was investigated. The duplex shot-peening treatment with ceramic balls and the particulate MoS 2 solid lubricant provided excellent wear resistance under a severe loading and sliding condition because the uniform and minute surface...
The effect of three different solid lubricants (graphite, Sb 2 S 3 , and MoS 2 ) in the brake friction material on various aspects of friction characteristics was investigated. Three friction material specimens were produced based on an experimental formulation, and they contained 10vol.% graphite, 7vol.% graphite+3vol.% Sb 2 S 3 , and 7vol.% graphite+3vol.%...
A new 16 MnNb steel–PTFE composite (A) containing 60% area proportion of PTFE composite was developed. Another type of common solid lubricant embedded C86300 bronze–PTFE composite (B) containing 35% area proportion of PTFE composite was also selected for a comparative investigation under similar testing conditions. Friction and wear experiments were performed in an oscillating sliding tribotester...
Tribological behavior of aluminium matrix composite (AMC)/brake pad tribo-couple under dry sliding conditions was studied using Pin-on-Disc machine. Brake pad material was used as pins while the AMC formed the rotating disc. Series of experiments were performed to characterize the tribological nature of the tribo-couple. Load and sliding speeds were varied over a range to represent actual braking...
Solid lubricant systems were developed to provide friction and wear reduction in variable environmental conditions. The mechanisms employed to achieve cross-environment capability include “on demand” solid lubricant supply from reservoirs in hard wear protective coatings. This research explores recent advances in a precision laser machining to generate arrays of micrometer sized dimple reservoirs...
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