TUNGSTEN DISULFIDE NANOPARTICLES (WS2)
Nanoparticles research has gained momentum in the recent years by virtue of the unexpected outcomes that are possible by altering the atomic and molecular properties of basic elements. This article elaborates on the properties and applications of tungsten sulfide nanoparticles. Tungsten disulfide nanoparticles (WS2) are partially soluble in water and acidic solutions. It occurs in nature in the form of a mineral called tungstenite. These nanoparticles are the principal component of catalysts that are used for hydro-denitrification. They are used widely as solid lubricants that are used at high temperature environments. Tungsten is a Block D, Period 6 element and sulphur is a Block P, Period 3 element.
WS2 nanoparticles have very good performance in new solid lubricant materials, not only for general lubrication; also it can be used in the work environment of high temperature, high pressure, high vacuum, high load with radiation and corrosive media.
WS2 cluster produce magnetic alignment, lubrication process can be better if adsorbed on the metal surface to form a layer of nano protective lubricating film. WS2 has a very small friction coefficient (about 0.03); therefore it can be used as additives in the metal powder to obtain a stable friction coefficient. Nanoscale WS2 has good resistance to oxidation, it can be used as additives to lubricating oil (grease) effectively to improve lubricant (grease) extreme pressure properties and antiwar properties. By adding nanoscale tungsten disulfide in the casting process it enhances the self-lubricating properties and gives an excellent adsorption capacity on the metal surface.
WS2 nanoparticles are a new highly efficient catalyst; which are mainly used for oil catalysts and also can be used as solid lubricants. WS2 nanoparticles are used in dry film lubricants and self-lubricating composite materials. WS2 nanoparticles is used to create high-performance lubricant additive which can be used as fuel cells of the anode, organic electrolyte battery anode, the oxidation of sulfur dioxide in strong acid in the anode and the anode sensor. WS2 nanoparticles are used to make nano-ceramic composites which are good semiconductor material.
PROPERTIES OF TUNGSTEN DISULFIDE NANOPARTICLES
Tungsten Disulfide (WS2) is one of the most lubricous materials known to science. With Coefficient of Friction at 0.03, it offers excellent dry lubricity unmatched to any other substance. It can also be used in high temperature and high pressure applications. It offers temperature resistance from -450o F (-270oC) to 1200oF (650oC) in normal atmosphere and from -305oF (188o C) to 2400oF (1316oC) in Vacuum. Load bearing property of coated film is extremely high at 300,000 psi.
Physical and Technical Properties
|Molar Mass||247.98 g/mol|
|Melting point||1250 °C|
|Chemical Durability||Inert Substance Non toxic|
|Coat-able Substance||Iron,Aluminum,Copper etc.|
|Electronic config.||Tungsten [Xe] 4f14 5d4 6s2
Sulphur [Ne] 3s2 3p4
The research proves that tungsten disulfide can sufficiently lubricate the metals that come in contact with each other within the engine. It also shows that the lubricant can be used as a better alternative for conventional lubricating oils.
APPLICATIONS OF TUNGSTEN DISULFIDE NANOPARTICLES
Tungsten disulphide possess very good antifriction properties, since the coefficient of friction is 0.05 to 0.01 in vacuum and 0.1 to 0.2 in air at 1 kgcm -2 pressure and 0.025 in vacuum at a pressure of 1000kgcm -2. Due to their good adhesive characteristics and stability against moisture they are extensively employed as a solid lubricant. The lubricating properties of WS2 at high pressure (< 80 kbars) and temperature (<200°C) have also been investigated.
As a synthetic powder, Tungsten disulfide consists of various elements such as hexagonal crystal clusters and a lamellar lattice structure. These elements create a certain amount of friction, thus converting the powder into a very lubricious material. The same formula is being applied to engine oils.
As a tungsten disulfide lubricant helps to improve the tribological properties of engine oil, and increasing overall thermal conductivity. Thus, it minimizes friction within the engine, reduces internal wear and tear, and increases fuel efficiency.
Tungsten disulfide (WS2) is one of the most popular materials that are used as industrial lubricants. The product has been used in a variety of applications including aerospace, automotive, military and even medical. Marine and automotive industries have been two sectors that have really benefited from the use of the lubricant. Research is now being done on how tungsten disulfide can be used in other processes.
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