Tungsten disulfide (Tungsten disulfide) is an inorganic compound with a molecular formula of WS2 and a molecular weight of 247.97.
It is a small gray crystal or powder with metallic luster, belonging to the hexagonal crystal system, semi-conducting and diamagnetic. The natural mineral is tungstenite. The layered structure is easy to dissociate and has similar lubricating properties to graphite. Used as a lubricant, such as for aerosols.
Tungsten disulfide preparation method
1. Roasting decomposition method:
Tungstic acid reacts with ammonia water under stirring at 57-60°C for 3h, heat preservation and natural sedimentation for more than 16h, and the generated ammonium tungstate reacts with hydrogen sulfide gas to generate ammonium tetrathiotungstate after high temperature roasting and decompose into tungsten disulfide.
H2WO4+2NH3·H2O→(NH4)2WO4+2H2O
(NH4)2WO4+4H2S→(NH4)2WS4+4H2O
2(NH4)2WS4+3O2→2WS2+4NH3+2S+2SO2+H2O
2. Tungsten reacts very slowly with liquid sulfur. WS2 can be formed by passing sulfur vapor to red hot tungsten. Tungsten is mixed with stoichiometric sulphur bloom and reacted in a nitrogen atmosphere at 800°C for 24 hours to form WS2, such as reacting at 6MPa and 1800°C to form orthorhombic WS2.
3. Using ammonium tetrathiotungstate as the raw material, heating and decomposing the ammonium tetrathiotungstate under the condition of isolating the air, the temperature rises from room temperature to 700-1200℃ with a temperature gradient of 100-200℃/hour during heating. After being kept at this temperature for 24 to 48 hours, it is then reduced to room temperature with a temperature gradient of 30 to 110°C/hour, and the material is discharged and crushed.
The preparation method of ultrafine scaly crystal tungsten disulfide used for lubricants has simple process equipment, does not pollute the environment, and is safe and reliable in operation, and can produce tungsten disulfide with stable quality, high purity, and ultrafine crystal structure of hexagonal crystal system.
Advantages of tungsten disulfide lubrication
1. It has a very low friction coefficient (0.03), high extreme pressure resistance and oxidation resistance (starts to decompose at 450°C in the air, completely decomposes at 650°C, starts to decompose at 1100°C in vacuum, and completely decomposes at 2000°C). It is suitable for lubrication under various harsh conditions such as high temperature, high pressure, high vacuum, high load, high speed, high radiation, strong corrosion, and ultra-low temperature.
2. It has good adsorption capacity on metal surface. It can be added to engineering plastics to make lubricating originals or evenly mixed with some volatile solvents and sprayed on the metal surface to improve the life of the die and the surface finish of the workpiece in the forging process.
3. Tungsten disulfide powder can be mixed with oils and greases to form tungsten disulfide oil, tungsten disulfide ointment, tungsten disulfide wax and other solid lubricating blocks and lubricating films.
Overview of Tungsten Disulfide
Difluidized tungsten is a small gray crystal or powder with metallic luster, belonging to the hexagonal crystal system, semi-conductive and diamagnetic. The natural mineral is tungsten ore, the layered structure is easy to dissociate, and it has lubricating properties similar to graphite.
Application of tungsten disulfide
It can be used as a lubricant with better performance than molybdenum disulfide, low friction coefficient and high compressive strength. Respectively used for high temperature, high pressure, high speed, high load and equipment operating in chemically active media. The forging lubricant is equipped with other materials to extend the life of the mold and improve the finish of the product. Filling materials with PTFE and nylon can be used to make self-lubricating parts. In addition, tungsten disulfide can also be used as a catalyst in the petrochemical industry and has the advantage of cracking tungsten disulfide. (WS2) or tungsten disulfide is a very smooth dry film friction coating. The friction coefficient of WS2 is extremely low, at 0.03, which is lower than that of PTFE, graphite or molybdenum disulfide (MoS2).
WS2 is an excellent mold release material for plastic molds, extrusion molds and other mold release applications.
WS2 does not require hydraulic oil, and can also be used with petrochemical oils, greases, synthetic oils, silicon valves and hydraulic oils. It has affinity for the fluid layer and maintains the fluid layer, which helps to keep the oil or grease on the surface, thereby further improving the lubricating effect. When the thickness is less than 1 micron, small parts can be coated without tolerance issues.
WS2 is also a fairly inert and non-toxic material that has been used in medical equipment and food processing applications.
WS2 replaces customer substrates by performing high-speed processing at ambient temperature. It does not make the substrate continuous or warped.
WS2 can be used alone or in combination with our PVD hard coating to improve durability, high performance, stable and reliable catalytic activity and longer service life.
Tungsten disulfide powder price
The price of tungsten disulfide powder will vary randomly with tungsten disulfide production cost, transportation cost, international situation, exchange rate and supply and demand of tungsten disulfide market. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for tungsten disulfide, please feel free to send an inquiry to get the latest price of tungsten disulfide.
Tungsten Disulfide Supplier
As a global tungsten disulfide supplier, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (zinc sulfide, zinc sulfide, bismuth sulfide, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.
Tungsten Disulfide details:
Tungsten Disulfide particle size:FSSS=0.4 to 0.7 μm,FSSS=0.85 to 1.15μm. 80nm
Tungsten Disulfide purity:99.9%
| W | S | Al | As | Cl | Cu | Fe | Ni | P | Si | O |
| 74.12 | 25.82 | 0.001 | 0.002 | 0.03 | 0.002 | 0.005 | 0.002 | 0.002 | 0.003 | 0.002 |
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