Structure and tribological characteristics of copper-tungsten bisulfide powder composite material

Baranov, N. G.; Ageeva, V. S.; Il'nitskaya, A. I.; Bogaichuk, N. T.; Федоренко, Г. А.

doi:10.1007/bf00793547

Cited by 3 publications

(2 citation statements)

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“…Tungsten disulfide (WS 2 ) Transition metal dichalcogenides (TMDs) have been used widely as solid lubricants [1] and chemical catalysts [2] for many years. Interest in them has, however, grown rapidly over recent years with the explosion of research into 2D materials.…”

Section: Introductionmentioning

confidence: 99%

Strain-induced phonon shifts in tungsten disulfide nanoplatelets and nanotubes

et al. 2016

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The relationship between structure and properties has been followed for different nanoscale forms of tungsten disulfide (2H-WS 2 ) namely exfoliated monolayer and few-layer nanoplatelets, and nanotubes. The similarities and differences between these nanostructured materials have been examined using a combination of optical microscopy, scanning and high-resolution transmission electron microscopy and atomic force microscopy. Photoluminescence and Raman spectroscopy have also been used to distinguish between monolayer and few-layer material. Strain induced phonon shifts have been followed from the changes in the positions of the A 1g and E 2g 1 Raman bands during uniaxial deformation. This has been modelled for monolayer using density functional theory with excellent agreement between the measured and predicted behaviour. It has been found that as the number of WS 2 layers increases for few-layer crystals or nanotubes, the A 1g mode hardens whereas the E 2g 1 mode softens. This is believed to be due to the A 1g mode, which involves out of plane atomic movements, being constrained by the increasing number of WS 2 layers whereas easy sliding reduces stress transfer to the individual layers for the E 2g 1 mode, involving only in-plane vibrations. This finding has enabled the anomalous phonon shift behaviour in earlier pressure measurements on WS 2 to be resolved, as well as similar effects in other transition metal dichalcogenides, such as molybdenum disulfide, to be explained.

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Section: Introductionmentioning

confidence: 99%

Strain-induced phonon shifts in tungsten disulfide nanoplatelets and nanotubes

et al. 2016

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“…Considerable investigations have been carried out on Cu matrix composites to study the effect of MoS 2 and graphite particles on dry sliding tribological behaviour. Sintered Cu-Sn composites have been synthesized to analyze the effect of copper coated graphite and MoS 2 powders volume fraction on the wear and Coefficient of Friction [9]. S Bao et al investigated the tribological behavior of friction and wear behavior of MoS 2 powder reinforced Cu matrix composite pins sliding against chromium bronze disk using electrical wear tester and concluded that wear rate and coefficient of friction were greatly decreased in this composites [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Optimization of Dry Sliding Wear Parameters on Solid Lubricant Reinforced Bronze Matrix Composites - A Taguchi Approach

Sangaravadivel¹,

Natarajan²,

Krishnaraj

2016

AMM

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This present study aims to investigate the dry sliding wear behaviour of tungsten disulfide (WS2) particle reinforced bronze matrix composite against surface hardened steel and to discover the optimum wear parameter values such as applied load, sliding distance, sliding velocity and volume fraction of reinforcement to reduce the specific wear rate. The composite specimens were fabricated by liquid metallurgy route by varying the volume fraction of solid lubricant particles and prepared as per American Society for Testing of Materials (ASTM) G99-95. The experiments were carried out based on Taguchi design of experiments technique with L27 orthogonal array. The wear tests were conducted in pin-on disc wear testing machine for different loads - 20N, 40N and 60N, sliding velocities - 2.09m/s, 2.62 m/s and 3.14m/s and sliding distances of 600m, 1200m and 1800m in unlubricated conditions. The significant influence of wear parameters on sliding wear, interactions and optimum combination of wear parameter values to minimize the wear rate were obtained by signal-to-noise (S/N) ratio and analysis of variance (ANOVA). The results demonstrated that inclusion of tungsten disulfide particles decreased the wear rate of bronze and also the increases in amount of secondary phase increase the wear resistance of composites. The effect of solid lubricant particle on interfacial temperature was also studied and reported. It was found that percentage of solid lubricant and load are the most significant factors influencing the friction and wear properties of composites. The results revealed that, WS2 particle reinforced bronze matrix composites were the potential component can be replaced for pure bronze products in wear resistance applications.

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