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.

Tungsten Manufacturer & Supplier: Chinatungsten Online -http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn
 

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.

Tungsten Manufacturer & Supplier: Chinatungsten Online -http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn
 

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.

Tungsten Manufacturer & Supplier: Chinatungsten Online -http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn
 

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.

Tungsten Manufacturer & Supplier: Chinatungsten Online -http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn
 

Ammonium tetrathiotungstate, also known as ammonium thiotungstate and ammonium tetrathiot, it is a bright orange crystals with a metallic luster. The physical properties of ammonium tetrathiotungstate as follows: chemical formula: H8N2S4W, molecular weight: 348.18, density 2.71. Related System Number as follows: CAS registry number: 13862-78-7, MDL registry number: MFCD00061410, PubChem registry number: 24860418. Ammonium tetrathiotungstate has some harm to the environment, so during the operation can not be discharged it directly into lakes and rivers or sewer.
Making ammonium tungstate and tungstate to react to generate ammonium tetrathiotungstate and the producing process are as follows:
1. The ammonium tungstate by ammonia dissolved.
2.And then reaction with ammonium sulfide solution, the molar ratio S / W = 4-6：1, the reaction temperature: room temperature to 90 ℃, reaction time: 0.5 to 3 hours, static crystallization time: 8to24 hours.
3. Finally, the crystals were filtered, washed with water and washed with percutaneous ethanol, and finally dried to obtain ammonium tetrathiotungstate.

Tungsten Manufacturer & Supplier: Chinatungsten Online -http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn
 

301
Number of Players: Any number of players may play, but normally two individuals or two teams play.
Numbers in Play: All the numbers are in play, but some receive greater use than others. The 19 and 20, for instance are used extensively for scoring points since they are the highest numbers on the tungsten dartboard. All the numbers may be used to throw the necessary doubles in the game.
This game is generally played by two people but can be played by teams. Each player starts with 301 points. The goal for each player is to reach zero, exactly, by subtracting the amount they score in a turn from the amount they had left from the previous turn. The player cannot start subtracting until they double in (hits one of the 21 doubles on the tungsten dartboard including the double bull). Once the double is hit, then all scores will count. To end the game, the player must also double out (ie. If they have 32 left, then they will need use tungsten dart to hit a double 16 to win. If they then hit a single sixteen, leaving 16, their next target would be a double 8. If they should hit more points than they have left, then they have busted. Their turn is over and they will resume with the same score they started with on that throw the next time it is their turn to throw.). If they hit the double leaving them zero points, then they have won the game.

501
Number of Players: Any number of players may play, but normally two individuals or two teams play.
Numbers in Play: All the numbers are in play, but some receive greater use than others. The 19 and 20, for instance are used extensively for scoring points since they are the highest number on the tungsten dartboard. All the numbers may be used to throw the necessary doubles in the game.
This game is generally played as a team event, though we also play it in our single events. All players/teams start with 501 points. Unlike 301, you do not have to double-in, but can start on any number. Each player/team subtracts the amount they score from the amount they have left. To win, like 301 above, the player/team will need to double-out to reach zero.

  Tungsten Dart Manufacturer & Supplier: Chinatungsten Online - http://www.chinadart.com/
  Tel.: 86 592 5129696; Fax: 86 592 5129797
  Email:  This email address is being protected from spambots. You need JavaScript enabled to view it.
  Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
  Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
  Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn
 

Spherical calcium tungstate microcrystals were prepared with heat treatment at 100 ℃ and using a calcium tungstate muddy solution by precipitation with natrium tungstate and calcium nitrate as starting materials, and with cetyltrimethyl ammonium bromide as a surfactant. The spherical calcium tungstate microcrystals were characterized by X-ray diffraction and transmission elec-tron microscopy. The results indicate that the crystallites of the calcium tungstate samples are excellent, and the diameters of the calcium tungstate microcrystals with outstanding spherical morphology are 2.1-3.2 μm, and the particles are well dispersed and not aggregated. Cetyltrimethyl ammonium bromide plays an important role in the formation of spherical calcium tungstate microcrystals. When excited at 265 nm, the luminescence of calcium tungstate microcrystals exhibits a luminous peak in the blue band. The luminescent intensity of spherical calcium tungstate microcrystals is about two times greater than that of the aggregate particles.

 

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Calcium tungstate nanocrystalline was successfully synthesised via a microwave irradiation method using Ca(NO₃)₂ and Na₂WO₄ in ethylene glycol, without the requirement of any calcination. The product was analysed by X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and photoluminescence spectrometry. XRD, SAED and TEM revealed that the product was body-centred tetragonal CaWO₄ with an average particle size of 12 nm. Different oscillation modes were detected by Raman spectroscopy and FTIR. They showed the strong W–O stretching in [WO₄]²⁻ tetrahedrons at 711–933 cm⁻¹. Photoluminescence (PL) of CaWO₄ nanocrystalline showed the maximum emission peak at 422 nm.

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

There is a facile microemulsion-mediated hydrothermal procedure to synthesize the precursor of Eu³⁺-doped CaWO₄ nanoparticles.SEM shows that the nanoparticles are similar to sphere.The Eu³⁺-doped CaWO₄ phosphor was characterized by powder X-ray diffractometer.According to our measurements with XRD,the products belong to tetragonal structure.The effects of sintering temperature and time on the luminescence of the samples were investigated.The luminescence data indicate the optimum condition for heat-treatment of the precursor was at 600℃ for 2h.The effects of different content of Eu³⁺ on the luminescence of CaWO₄∶Eu³⁺ nanoparticles were also investigated,and the results display that luminescence intensity is enhanced with the slightly increasing of Eu³⁺ content,the optimum of Eu³⁺-doped concentration is 0.1 %(mole fraction).

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

The role of defects formed owing to the deviations from stoichiometry is analyzed for CaWO₄ single crystals grown by the Czochralski method. It is shown that the defects leading to the light scattering in CaWO₄ crystals affect the spectra of X-ray luminescence and the luminescence kinetics only slightly, but give rise to an additional peak in the thermoluminescence spectrum. Addition of WO₃ to the melt eliminates the light scattering and the additional thermoluminescence peak.

 

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn