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:
Tungsten dioxideis an inorganic 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.
WS2tungsten disulfide 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. This layered structure led to the formation of inorganic Nanotubes in WS2 after it was heated in 1992.
Most of the WS2 crystals are dark gray hexagonal with a layered structure. Similar to its closely related MoS2, it is a dry oil lubricant.
While WS2 was believed to be relatively stable under ambient air, recent studies on single-layer WS2 oxidation within the environment show otherwise. A photooxidation reaction converts WS2 quickly to tungstenoxide in a single-layer form. This happens within a matter of days under 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
The traditional method of seperating monolayer WS2 involved a chemical exfoliation process. That is, inserting lithium into n-butyl lignin (in hexane) and then removing the Li compound using ultrasonic water treatment. Treatment with different reagents, 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 react with 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 stoichiometric sulfur blossom and then reacted at 800°C for 24hrs to make WS2, or at 600MPa to create orthorhombic WS2.
3. By heating the ammonium trithiotungstate and decomposing it, under the condition that the air is isolated, the temperature rises from 100 to 200 degrees Celsius per hour 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, produces high-quality tungsten, with high purity and a hexagonal crystal structure.
Tungsten Disulfide Application WS2
Tungsten disulfide is used to make tungsten disulfide lubricant, tungsten disulfide grease.
Tungsten Disulfide WS2 friction coating is very smooth. 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 our 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:
We offer many packing options that are dependent on the Tungsten Dulfide Powder amount.
Tungsten Disulfide Powder Packaging:Vacuum Packing, 100g to 500g or 1kg/bag at 25kg/barrel. Or as you request.
Tungsten Disulfide powder shipping: after payment receipt, can be sent out by sea or air.
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Tungsten Sulfide Properties
tungsten sulfide (WS2), tungsten disulphide,
tungsten(IV) sulfide, WS2 powder
Tungsten Sulfide Health & Safety Information