Tungsten disulfide has similar lubricating properties with graphite, is widely used as a lubricant. And tungsten disulfide as a lubricant performance is better than molybdenum disulfide, mainly due to it properties which is low friction coefficient(0.03), high resistance to extreme pressure and oxidation resistance, namely, tungsten disulfide at 450 ℃ in the air begins to decompose, until 650 ℃ completely decomposed. On the other hand, at1100 ℃ in the vacuum it begins to decompose, until 2000 ℃ completely decomposed. This performance is conducive tungsten disulfide apply in high-temperature, high pressure, high speed, high load, as well as in chemical active media device operation.
Meanwhile tungsten disulfide on the metal surface has a good adsorption capacity can be added to make the original lubrication in engineering plastics or it can mix with volatile solvent sprayed on the metal surface, to improve the life of mold in press forging and workpiece surface finish.
Tungsten disulfide also can mix with the oil, fat oil to form tungsten disulfide, tungsten disulfide grease, wax and other tungsten disulfide solid lubricating block and lubricating film.

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Tungsten disulfide is used as solid lubricants, dry film lubricants, self-lubricating composite material, and wherein the nano tungsten disulfide solid lubricant is the best. Mainly because tungsten disulfide nano particles has low friction coefficient, high compressive strength, and with acid erosion resistance, good load performance, non-toxic, wide temperature range, long life and other advantages of lubrication and so it is widely used.
Meanwhile tungsten disulfide nano particles can also be used as an additive to produce high-performance lubricants. After the studies found adding the right amount of tungsten disulfide nano particles in the lubricant can greatly improve the lubricating properties of the lubricant. Under the same conditions, there will improve lubricating properties of adding nanometer WS2 base oil than conventional particles added base oil and has good dispersion stability, friction factor can be reduced by 20% to 50%, the film strength can be increased by 30% ~ 40%, which is far superior lubricating properties than molybdenum disulfide nano particles. With the addition of a lubricant nano particles combines the advantages of solid lubrication and lubrication, which is expected to realize from room temperature to high temperature (over 800 ℃) full lubrication. Therefore, tungsten disulfide nano particles can be used as additives synthesis new lubrication system which has broad application prospects.

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Tungsten disulfide is widely used in lubricant field, at the same time because its good performance in cracking, long service life and catalytic activity is stable and reliable, so it also be used in petroleum catalysts. Where it can serve as a hydrogen desulfurization catalyst, on the other hand it can be used in the polymerization, heavy Catalyst whole, hydration, dehydration and other processes of hydroxylation, so it has been widely applied to the oil refinery.
Tungsten disulfide can also apply in inorganic materials preparation technology which is the nano-tungsten disulfide can be used as an efficient catalyst. Since it can form the novel compounds capable with sandwich structure, nano tungsten disulfide monomolecular layer may be formed two-dimensional material, and be able to re-stack "structure room floor"with very large space the new particulate material, and in the process of re-stacking inserted substances can be added to make it a catalyst or sensitive display and superconducting materials, its huge internal surface area easily mixed with accelerator, a new type of highly efficient catalysts.
Tungsten disulfide also can as fuel cells, organic electrolyte rechargeable battery, as well as sensors’ anode and used to make nano-ceramic composite materials.

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Nano tungsten disulfide due to its good performance and broad application prospects is widespread concern, there are many experts and scholars prepared a lot of research on it. However, tungsten disulfide natural mineral is relatively rare, general produce by chemical method to extraction, chemical synthesis method can produce high purity, low impurities and fine granular sulfide oxide. On the other hand it can produce different functional requirements sulfide oxide, therefore chemical synthesis method for produce nano tungsten disulfide has been widespread concern. But it also makes production costs high tungsten disulfide nano particles.
Currently, There are many methods for produce tungsten disulfide, such as ammonium tetrathiotungstate thermal decomposition method, hydrogen sulfide reduction method, high-energy ball milling method, carbon nanotubes space limitations method, hydrothermal synthesis method, hydrogen sulfide or sulfur vapor reduction method, high energy physics and chemistry combine method and so on. So that producing methods of nano tungsten disulfide general can be divided into two types, namely, direct reaction of tungsten and sulfide to form tungsten disulfide or making them react to form reaction precursor and then by ecomposition or reduction with appropriate to generate tungsten disulfide nanoparticles.

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