Why molybdenum disulfide can be used as friction materials?
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Author : Lzh
Update time : 2023-02-02 15:03:44
What is molybdenum disulfide? The main component ofmolybdenum disulfideis a solid black powder with a metallic luster. The chemical formula is MoS2, the melting point is 1185 ℃, the density is 4.80g/cm3 (14 ℃), the Mohs hardness is 1.0~1.5.1370 ℃, and it is decomposed into metal molybdenum and sulfur at 1600 ℃. When heated in air at 315 ℃, it is oxidized, the temperature rises and the oxidation reaction is accelerated. Molybdenum disulfide and alkyl lithium react under control to form an embedded compound (sandwich compound) LixMoS2. If it reacts with butyl lithium, Then the product is LiMoS2. Molybdenum disulfide has a high content of active sulfur, which is easy to cause corrosion to copper. It has been discussed in many books and papers on lubricant additives. In addition, when parts made of copper and their alloys need lubrication, it is not impossible to choose lubricating products containing molybdenum disulfide. It also needs to add a copper corrosion inhibitor.
Preparation of molybdenum disulfide Molybdenum concentrate can be prepared by repeatedly stirring with hydrochloric acid and hydrofluoric acid under direct steam heating, washing with hot water, centrifuging, drying, and crushing. Hydrogen sulfide gas is introduced into the ammonium molybdate solution to generate ammonium thiomolybdate. Hydrochloric acid is added to convert it into molybdenum trisulfide precipitation, centrifuging, washing, drying, and crushing. Finally, it is heated to 950 ° C for desulfurization. Molybdenum and sulfur are directly heated and combined under vacuum by synthesis. The purity can reach above 99.95. The latest research of the molybdenum industry found that the high-purity molybdenum disulfide produced by the synthesis method has defects in lubrication because molybdenum disulfide is two sulfur atoms+one molybdenum atom. Still, the structure of the synthesis method is not very stable. 1.9 sulfur atoms+1 molybdenum atom or 2.1 sulfur atoms+1 molybdenum atom will appear. Therefore, the lubrication is unstable.
Use of molybdenum disulfide Friction reduction: the particle size of molybdenum disulfide produced by supersonic airflow crushing reaches 325-2500 meshes, the microparticle hardness is 1-1.5m, and the friction coefficient is 0.05-0.1m, so it can play a role in friction reduction when used in friction materials; Anti-oxidation: Molybdenum disulfide is obtained through chemical purification and comprehensive reaction, and its PH value is 7-8, which is slightly alkaline. It covers the surface of friction materials, protecting other materials and preventing them from oxidizing. In particular, it can prevent other materials from falling off and enhance the adhesion; molybdenum disulfide can also become a new material for making transistors. Compared with graphene, which is also a two-dimensional material, molybdenum disulfide has an energy band gap of 1.8eV, while graphene does not have an energy band gap. Therefore, molybdenum disulfide may have a wide application space in nano transistors. Moreover, the electron mobility of single-layer molybdenum disulfide transistors can reach up to about 500 cm ^ 2/(V · s), and the current switching rate can reach one × 10^8.
Price of molybdenum disulfide Molybdenum disulfide particle size and purity will affect the product's price, and the purchase volume can also affect the cost of molybdenum disulfide. A large amount of large amount will be lower. The price of molybdenum disulfide can be found on our company's official website.
Molybdenum disulfide supplier Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including molybdenum disulfide, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective molybdenum disulfide, you are welcome to contact us or inquire at any time.
