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CN102701283A - Preparation method of tungsten …

The invention relates to a preparation method of tungsten disulfide nanorods, belonging to the technical field of nano material preparation. The method provided by the invention comprises the following steps: (1) preparing a solution, that is, dissolving (NH4) 2WO4, CS (NH2) 2, NH2OH.HCl and a surfactant in water to obtain a solution, and then adjusting the pH value of the solution by acid to ...

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Tribology of Selected Hard Coatings for Oil and Gas ...

To investigate the physical and chemical changes that occurred during tribo-testing, scanning electron microscopy of the coatings’ cross section, wear tracks, and wear debris were obtained. ... Prasad, S.V., McDevitt, N.T., Zabinski, J.S.: Tribology of tungsten disulfide-nanocrystalline zinc oxide adaptive lubricant films from ambient to 500°C.

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Tribology of Solid Lubricants | SpringerLink

Scharf TW, Rajendran A, Banerjee R, Sequeda F (2009) Growth, structure and friction behavior of titanium doped tungsten disulphide (Ti-WS2) nanocomposite thin films. Thin Solid Films 517:5666–5675 CrossRef Google Scholar

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Lubricants | Free Full-Text | Friction of Tungsten-Based ...

An investigation was made to determine the effects of tungsten surface coating on the coefficient of friction of sliding contact between lubricated steel surfaces. The four-ball test was modified, using a tungsten carbide ball bearing in the spindle to cause sliding contact onto three hard steel ball bearings coated with tungsten disulfide lamellar dry lubricant coating, with a coating of ...

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Lubricants | Free Full-Text | Friction of Tungsten-Based ...

An investigation was made to determine the effects of tungsten surface coating on the coefficient of friction of sliding contact between lubricated steel surfaces. The four-ball test was modified, using a tungsten carbide ball bearing in the spindle to cause sliding contact onto three hard steel ball bearings coated with tungsten disulfide lamellar dry lubricant coating, with a coating of ...

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10.1016/S0043-1648(99)00329-4 | DeepDyve

Compared with MoS 2 , tungsten disulfide is thermally more stable [21, 22] and provides approximately 100°C increase in maximum operating temperature [23] . Therefore, tungsten disulfide was chosen as the primary lubricant.

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What Are Lubricants? | About Tribology

Definition. Lubricant is a substance which is used to control (more often to reduce) friction and wear of the surfaces in a contact of the bodies in relative motion [1]. Depending on its nature, lubricants are also used to eliminate heat and wear debris, supply additives into the contact, transmit power, protect, seal.A lubricant can be in liquid (oil, water, etc.), solid (graphite, graphene ...

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Investigation of mechanical and tribological …

2019-1-11 · Tungsten disulfide (WS 2) is a layered material that can be used as a solid lubricant with low friction . The structure of WS 2 is a typical 2D-layer that behaves as a solid lubricant like MoS 2 and graphite. Layers of WS 2 slide on each other and create a soft transfer film on the surface.

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Significance of tungsten disulfide on the mechanical …

2020-10-20 · The phosphor bronze (PB) of grade ASTM B-505 C 90700 is used as a matrix to fabricate the composite samples. The presence of phosphorous in this alloy makes the bronze more fluid and also improves the tensile strength, corrosion resistance, and reduces the frictional coefficient. 21 The major properties are to be considered in material selection under three categories: physical, chemical, and ...

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In Situ TEM Characterization of Shear-Stress-Induced ...

2019-5-25 · The experimental study of interlayer sliding at the nanoscale in layered solids has been limited thus far by the incapability of mechanical and imaging probes to simultaneously access sliding interfaces and overcome through mechanical stimulus the van der Waals and Coulombic interactions holding the layers in place. For this purpose, straightforward methods were developed to achieve …

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Triboactive Component Coatings : Tribological Testing …

The majority of the tribofilms discussed, formed in very different environments, are built up by tungsten disulfide (WS 2), which is a material similar to graphite, with a lamellar structure where strongly bonded atomic planes may slip over each other almost without resistance.

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Triboactive Component Coatings : Tribological Testing …

The majority of the tribofilms discussed, formed in very different environments, are built up by tungsten disulfide (WS 2), which is a material similar to graphite, with a lamellar structure where strongly bonded atomic planes may slip over each other almost without resistance.

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Tribological behaviour of self-lubricating Mg matrix ...

In this study, magnesium matrix composites reinforced with 5 wt% WS2 and 15–20 wt% SiC particles were sintered via powder processing. The friction and wear behaviour were studied using a ball-on-disc tribometer against Al2O3 ball, subjected to normal loads of 1–4 N, room temperature and 110 °C, sliding speed of 22.5 mm/s, and lubricant of PAO base oil.

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Tribological behaviour of self-lubricating Mg matrix ...

In this study, magnesium matrix composites reinforced with 5 wt% WS2 and 15–20 wt% SiC particles were sintered via powder processing. The friction and wear behaviour were studied using a ball-on-disc tribometer against Al2O3 ball, subjected to normal loads of 1–4 N, room temperature and 110 °C, sliding speed of 22.5 mm/s, and lubricant of PAO base oil.

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Tribological behaviour of self-lubricating Mg matrix ...

Tribological behaviour of self-lubricating Mg matrix composites reinforced with silicon carbide and tungsten disulfide. In this study, magnesium matrix composites reinforced with 5 wt% WS2 and 15–20 wt% SiC particles were sintered via powder processing. The friction and wear behaviour were studied using a ball-on-disc tribometer against Al2O3 ...