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 one 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/the same type MoS2 instead of a coordination circle with W (instead molybdenum) atoms in a triangular prism. After heating a thin piece of WS2 in 1992, WS2 created inorganic nantubes due to its layered structure.
Most of the WS2 crystals are dark gray hexagonal with a layered appearance. Similar to its closely related MoS2, it is a dry oil lubricant.
Although WS2 was believed to be relatively stable under ambient air, recent studies on single-layer WS2 oxidation have shown that it isn’t. Photooxidation reactions are quick enough to transform WS2 in to tungsten oxide within a single layer. This happens in just 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 as well. 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 stripping any Li compounds by ultrasonic treatment with water. 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 and FSSS=0.85-1.15m.
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 the generated ammonium. This results in ammonium pentathiotungstate, 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 heating sulfur vapor and red hottungsten. Tungsten can be combined with stoichiometric sulfur blossom and then reacted at 800°C for 24hrs to make WS2.
3. By heating the ammonium trithiotungstate and decomposing it, under the condition that the air is isolated, the temperature rises from ambient temperature to 700-1200. 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, it 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 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, oil synthetic, oil silicone, and 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.
You can use WS2 alone, or with our PVD Hard Coating to increase durability.
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 packaging, 100g to 500g or 1kg/bag at 25kg/barrel. Or as you request.
Tungsten Disulfide powder shipping: Could be sent by sea, air or express, once the payment has been received.
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Tungsten Sulfide Properties
tungsten sulfide (WS2), tungsten disulphide,
tungsten(IV) sulfide, WS2 powder
Tungsten Sulfide Health & Safety Information