Why is molybdenum disulfide used as friction material?
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Author : Lzh
Update time : 2023-02-04 14:43:56
What is molybdenum disulfide? Molybdenum disulfide is an inorganic substance with a chemical formula of MoS2. It is the main component of molybdenite. It is a solid black powder with a metallic luster. Its melting point is 2375 ℃, and its density is 4.80g/cm ³ (14 ℃)—Mohs hardness 1.0~1.5. The main component of molybdenite is a solid black powder with a metallic luster. The chemical formula MoS2, melting point 2375 ℃, density 4.80 g/cm3 (14 ℃), Mohs hardness 1.0~1.51370 ℃ begins to decompose, 1600 ℃ decomposes into metal molybdenum and sulfur. When heated in the air, it begins to be oxidized, the temperature rises, and the oxidation reaction accelerates. Molybdenum disulfide is insoluble in water, dilute acid, and concentrated sulfuric acid. It is generally insoluble in other acids, alkalis, and organic solvents. However, it is dissolved in aqua regia and boiled concentrated sulfuric acid, which oxidizes slowly at 400 ℃ to form molybdenum trioxide.
Preparation principle 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. Ammonium molybdate solution is injected with hydrogen sulfide gas to generate ammonium thiomolybdate. The addition of hydrochloric acid is converted into molybdenum trisulfide precipitation, centrifuging, washing, drying, and crushing. Finally, it can be prepared by heating it to 950 ° C for desulfurization.
Use of molybdenum disulfide The main function of molybdenum disulfide used in friction materials is to reduce friction at low temperatures and increase friction at high temperatures. The loss on ignition is small, and it is volatile in friction materials. Antifriction: the particle size of molybdenum disulfide processed by supersonic airflow grinding reaches 325-2500 mesh, the micro-particle hardness is 1-1.5, and the friction coefficient is 0.05-0.1, so it can play a role in reducing friction when used in friction materials; Antifriction: Molybdenum disulfide is not conductive, and there are copolymers of molybdenum disulfide, molybdenum trisulfide, and molybdenum trioxide. When the temperature of the friction material rises sharply due to friction, the molybdenum trioxide particles in the copolymer expand with the temperature rise, which plays a role in increasing friction; Anti-oxidation: Molybdenum disulfide is obtained through chemical purification and comprehensive reaction, with a PH value of 7-8, slightly alkaline. It covers the surface of friction materials, can protect other materials, prevent them from oxidation, especially make other materials not easy to fall off, and enhance adhesion.
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 tocontact us or inquire at any time.
