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Tungsten dioxide, molecular formula WS2, molecularweight 247.97 It’s a grey fine crystal, or powder, with a metallic shine. This product is part of the hexagonal system.
Dimensions of partilcles: 70-300nm.
About Tungsten Disulfide WS2:
is an organic compound that is composed of tungsten, sulfur and WS2
. It is part of the transition metal dihalides group. The rarest form of tungsten ore is it. This material is part of certain catalysts used for hydrodesulfurization and hydrodenitrogenation.
employs a layered structural similar to MoS2 and the same MoS2 type, instead of a coordination circle with W atoms (instead molybdenum) within a triangular prism. After heating a thin sample WS2, inorganic nantubes were formed.
The majority of the WS2 are dark gray hexagonal quartz crystals, with a layered structure. Similar to its closely related MoS2, the WS2 has characteristics that are similar to a dry oil lubricant.
People have believed for a while that WS2 can be safely stored in air. However, recent studies on single-layer WS2 oxidation within the environment show that the opposite is true. One layer of WS2 can be converted into tungstenoxide by photooxidation. This reaction occurs quickly in an atmosphere and ambient light. One-layer WS2 absorbs visible wavelength light (660nm/>1.88eV) and oxidizes it. To proceed with the reaction, you will need water and oxygen. Sulfuric acid and tungsten dioxide are the products of this reaction. Similar results were observed for other semiconductor transitional metal dihalides, such as MoS2, under atmospheric light.
A mixture of hydrofluoric and nitric acids can attack WS2. If heated in oxygen-containing conditions, WS2 will turn to tungsten dioxide. In the absence of oxygen, however, WS2 won’t melt and will instead decompose to tungsten trioxide and sulfur. The decomposition temperature, however, is only 1250°C
Separation of monolayer WS2 has been done historically using a chemical exfoliation process. That is inserting lithium from N-butyl Lithium (in hexane) and then stripping any Li compounds by ultrasonic water treatment. Treatment with various agents such as lithium halide or chlorosulfonic acids can help to shed WS2.
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Tungsten Disulfide details:
Tungsten Dioxide particle size: FSS=0.4 to 0.7% m, FSS=0.85 m to 1.15 m.
Tungsten Disulfide purity: 99.9%
How is Tungsten Disulfide WS2 produced?|
1. Roasting decomposition method:
At 57-60°C, the tungstic acid reacts under heat preservation for 16 hours. Ammonium tungstate is formed when hydrogen sulfide gases reacts to the generated ammonium. This results in ammonium Tetrathiotungstate, which can be decomposed into tungsten dioxide after high temperature roasting.
2. Tungsten is very slow to react with liquid sulfur. You can make WS2 by passing sulfur vapour to red hottungsten. Tungsten can be combined with stoichiometrically sulfur-bleached tungsten and then reacted at 800°C for 24hrs to form WS2.
3. By heating the ammonium trithiotungstate and decomposing it, under the condition that the air is isolated, the temperature rises from the room to 700-1200. There’s a 100-200 degree temperature gradient during heating. After it has been kept at that temperature for 24-48 hours, it’s then brought back to room temperature, with a temperature gradient between 30 and 110°C/hour. Next, the material is crushed and discharged.
This method for making ultrafine, scaly, tungsten dioxide is simple to use, doesn’t pollute the environment and has high-quality, stable, pure tungsten.
Tungsten Disulfide Application WS2
Tungsten disulfide is used to make tungsten disulfide lubricant, tungsten disulfide grease.
Tungsten Disulfide WS2 is an extremely smooth and dry film friction coating. WS2 has an extremely low friction coefficient, 0.03, which is significantly lower than that of graphite (PTFE), molybdenum sulfide(MoS2), and graphite (graphite). It has a remarkable performance when it comes to lubricity. You can use it for electronic equipment such as sensors, transistors, and photocatalysis. Tungsten dioxide powder is very soluble in water and alcohol.
Extrusion molds, plastic molds, and all other types of demolding use WS2 as a release material.
Hydraulic oil can no longer be required. WS2 can work with any type of oil such as grease, hydraulic oil or silicone, and can even be combined with hydraulic oil. It retains fluid layers by having an affinity with them. It keeps oil and grease off the surface. This improves the lubrication.
Tolerable tolerances can be achieved on small parts when the thickness is below 1 micron.
Additionally, WS2 can be used for food processing as well as medical equipment.
WS2 is a high-speed process that replaces customer base material at ambient temperature. This does not cause the substrate to become warped or continuous.
To increase durability, you can use WS2 alone or with the PVD Hard Coating.
Tungsten disulfide powder storage condition:
Tungsten Disulfide powder should not be exposed to the air. Damp reunion can affect dispersion performance of WS2 powder and its use. Additionally, WS2 powder must be kept away from stress.
Packing & Shipping Tungsten Disulfide WS2 powder:
There are several types of packing available depending on how large the Tungsten Dulfide Powder is.
Tungsten Disulfide Powder Packaging:vacuum packaging, 100g to 500g or 1kg/bag at 25kg/barrel. Or as you request.
Tungsten Disulfide powder shipping:could ship out by sea or by air as soon as payment receipt is received.
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Tungsten Sulfide Properties
tungsten sulfide (WS2), tungsten disulphide,
tungsten(IV) sulfide, WS2 powder
|| Molecular Weigh
||Solubility of H2O
Tungsten Sulfide Health & Safety Information