dithioxotungsten
tungsten disulphide
CAS: 12138-09-9
Molecular Formula: S2W
dithioxotungsten - Names and Identifiers
dithioxotungsten - Physico-chemical Properties
| Molecular Formula | S2W |
| Molar Mass | 247.97 |
| Density | 7.5g/mLat 25°C(lit.) |
| Melting Point | 1480 °C |
| Water Solubility | Slightly soluble in water. |
| Appearance | Grey to black powder |
| Specific Gravity | 7.5 |
| Color | Dark gray |
| Odor | Transparent |
| Exposure Limit | ACGIH: TWA 3 mg/m3NIOSH: TWA 5 mg/m3; STEL 10 mg/m3 |
| Storage Condition | Room Temprature |
| MDL | MFCD00011467 |
| Physical and Chemical Properties | Gray with metallic luster fine crystal or powder, hexagonal crystal structure. The relative density was 7.5. Melting point 1250 °c. Insoluble in water. Soluble in nitric acid and hydrofluoric acid mixed acid. Soluble in molten alkali, insoluble in alcohol. Stable in air. |
| Use | Can be used as a lubricant. The performance is better than molybdenum disulfide, the friction coefficient is lower, and the compressive strength is larger. Used separately for high temperature, high pressure, high speed, high load, and equipment operating in chemically active media. Forging and stamping lubricants formulated with other materials can prolong the service life of dies and improve the smoothness of products. Filling materials formulated with polytetrafluoroethylene and nylon can be used to make self-lubricating parts. |
dithioxotungsten - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection |
| WGK Germany | - |
| RTECS | YO7716000 |
| TSCA | Yes |
| HS Code | 28291900 |
dithioxotungsten - Introduction
Slightly soluble in cold water. Dissolve in hot water.
Last Update：2022-10-16 17:12:47
dithioxotungsten - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Electronic properties | 2D semiconductor |
| Bandgap | 1.4 - 2.01 eV |
| product characteristics | tungsten disulfide is a compound of tungsten and sulfur, chemical formula WS2, molecular weight 247.97, the state is black-gray powder, appears in nature as tungsten ore, is a dark gray orthorhombic crystalline solid. Relative density 7.510. Insoluble in water and organic solvents, do not react with acid and alkali (except for the mixture of concentrated nitric acid and hydrofluoric acid), heated in air and oxidized to tungsten trioxide, heated to 1250 ℃ in vacuum and decomposed into Tungsten and sulfur. In a dry pure nitrogen gas stream, the mixture of tungsten trisulfide and sulfur is heated to 900°C to sublimate the excess sulfur, and the residue is tungsten disulfide. Tungsten disulfide can be used as a lubricant with better performance than molybdenum disulfide, lower friction coefficient, higher compressive strength, and lubricity at 1316 ℃. Used as a high-temperature solid lubricant, used alone in high temperature, high pressure, high speed, high load, and in chemical active medium transport equipment. Forging and stamping lubricants configured with other materials can prolong die life and improve product finish. Filling materials formulated with PTFE and nylon can be used to make self-lubricating parts. The tungstic acid reacts with ammonia to form ammonium tungstate, and then reacts with hydrogen sulfide to form ammonium tetrathiotungstate, which is decomposed into this product after high-temperature roasting. |
| Nano tungsten disulfide | Nano tungsten disulfide is a new type of solid lubricating material with extremely excellent performance. It is not only suitable for general lubrication conditions, but also can be used for high temperature, High pressure, high vacuum, high load, radiation and corrosive medium working environment; WS2 cluster due to the magnetism generated by the internal arrangement of the cluster, it can be better adsorbed on the metal surface during the lubrication process and can form a nano-protective lubricating film on the metal surface; nano-tungsten disulfide has a very small friction coefficient (about 0.03), and can be used as an additive in metal powder Addition to improve the adhesion of metal powder under high-speed friction conditions and make it obtain a stable friction factor; nano-tungsten disulfide has good oxidation resistance, it can be added to the lubricating oil (grease) as an additive, which can effectively improve the extreme pressure performance and anti-wear and anti-friction performance of the lubricating oil (grease); adding nano-level tungsten disulfide in the casting process can make the cast metal have a certain Self-lubricating performance, excellent adsorption capacity on the metal surface, can be mixed with oils and lipids to form tungsten disulfide oil agent, tungsten disulfide ointment, tungsten disulfide wax and other solid lubricating blocks and lubricating films, at the same time, in the field of composite materials, it can be used as a modifier. The main application areas of nano tungsten disulfide in the city of nano modification are as follows: 1. Nano tungsten disulfide (WS2) is mainly used as a petroleum catalyst: it can be used as a hydrodesulfurization catalyst, and it is also used as a catalyst for polymerization, reforming, hydration, dehydration and hydroxylation processes, and because of its good cracking performance, stable and reliable catalytic activity, and long service life, it is very popular with petroleum refineries. 2. In the preparation technology of inorganic functional materials, nano WS2 is a new type of high-efficiency catalyst. Because it can form a new type of compound with a sandwich structure, nano WS2 can be made into a monomolecular layer two-dimensional material, and can be re-stacked as needed. A new granular material with a large internal space "floor room structure", and intercalation materials can be added during the re-stacking process to make it a catalyst or sensitive display and superconducting material, its huge internal surface area is easy to contain accelerators and become a new type of high-efficiency catalyst. The Nagoya Institute of Industry in Japan found that nano-WS2 has a great catalytic effect in the process of converting CO2 into CO, which will promote the development of carbon cycle technology. Pave the way to improve the trend of global warming. 3. WS2 can be used as solid lubricant, dry film lubricant and self-lubricating composite material: nano WS2 is the best solid lubricant with a friction factor of 0.01~0.03 and a compressive strength of up to 2100 MPa. WS2 has the advantages of acid and alkali corrosion resistance, good load resistance, non-toxic and harmless, wide use temperature, long lubrication life and low friction factor. In recent years, the ultra-low friction and wear shown by solid lubricant hollow fullerene nano WS2 has attracted much attention. For example, in the 1980s, the United States used nano WS2 particles to spray on the metal surface to form a WS2 lubricating dry film to greatly reduce the friction factor and improve the life of the mold. 4. Nano tungsten disulfide is a very important additive for manufacturing high-performance lubricating oil. |
| use | a new type of solid lubricant, suitable for lubrication under high temperature, high pressure, high load and high vacuum conditions. Add in engineering plastics to make self-lubricating components, or mixed with some volatile solvents, spray on the metal surface, in the forging to improve the life of the mold and the finish of the workpiece. It can be used as a lubricant. The performance is better than molybdenum disulfide, the friction coefficient is lower, and the compressive strength is larger. Used separately for high temperature, high pressure, high speed, high load, and equipment operating in chemically active media. Forging and stamping lubricants formulated with other materials can prolong the service life of dies and improve the smoothness of products. Filling materials formulated with PTFE and nylon can be used to make self-lubricating parts. |
| production method | roasting decomposition method tungstic acid and ammonia water react under stirring at 57~60 ℃ for 3 h, heat preservation and natural sedimentation for more than 16h, the generated ammonium tungstate reacts with hydrogen sulfide gas, the generated ammonium tetrathiotungstate is roasted at high temperature and decomposed into tungsten disulfide. Its H2Wo4 2NH3?H2O →(NH4)2WO4 2H2O(NH4)2WO4 4H2S →(NH4)2WS4 4H2O2(NH4)2WS4 3O2 → 2WS2 4NH3 ↑ 2S ↑ 2SO2 ↑ H2O |
Last Update：2024-04-10 22:29:15
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Tel: +86-17551318830
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