Why molybdenum disulfide is an important solid lubricant
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Author : Lzh
Update time : 2023-02-02 14:58:20
What is molybdenum disulfide? Molybdenum disulfide, the main component of molybdenite, is a solid black powder with a metallic lustre. 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 the temperature is 1600 ℃, which is decomposed into metal molybdenum and sulfur. When heated in air at 315 ℃, it starts to be oxidized, the temperature rises, and the oxidation reaction is accelerated. Molybdenum disulfide is insoluble in water, dilute acid and concentrated sulfuric acid and is generally insoluble in other acids, alkalis, and organic solvents. However, it is soluble in aqua regia and boiled concentrated sulfuric acid. Ferrotitanium reagent can be used to test the generated molybdenum trioxide. First, treat the product with sodium hydroxide or potassium hydroxide solution (the principle is to convert molybdenum trioxide into molybdate), then drop ferrotitanium reagent solution, which will react with the generated sodium molybdate or potassium molybdate to produce a golden solution. This method is very sensitive, and trace molybdate can be detected if no molybdenum trioxide is generated. The solution will not produce golden yellow because molybdenum disulfide does not react with sodium hydroxide or potassium hydroxide solution.
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 transform it into molybdenum trisulfide precipitation, centrifuging, washing, drying and crushing. Finally, it is heated to 950 ° C for desulfurization. Natural molybdenum resources in the world exist in the form of molybdenum sulfide. China's molybdenum ores are mainly tungsten molybdenum-associated minerals, Gold copper-associated ore. Molybdenum sulfide is flotation purified in a selected way. The national standard purity is 40% - 50% (here refers to molybdenum atomic content, standard purity=this purity * 1.668, the same below). Then it is washed and purified with acid and can be purified to 59.92. At this time, the obtained molybdenum sulfide is a high-purity molybdenum disulfide.
Use of molybdenum disulfide Molybdenum disulfide is an important solid lubricant, especially suitable for high temperatures and pressure. It also has diamagnetism, which can be used as a linear photoconductor and semiconductor showing P or N conductivity; it has the functions of rectification and energy exchange. Molybdenum disulfide can also be used as a catalyst for dehydrating complex hydrocarbons. It is also known as the "king of advanced solid lubricating oil". Molybdenum disulfide is a solid powder made from natural molybdenum concentrate powder after chemical purification to change the molecular structure. This product is black with silver grey colour, metallic luster, greasy touch, and insoluble in water. The product has the advantages of good dispersion and non-adhesion and can be added to various oils. It can form a colloidal state that never sticks, increasing the lubricity and extreme grease pressure. It is also suitable for high temperature, high pressure, high speed and high load mechanical working conditions and extends the service life of the equipment. The main function of molybdenum disulfide used as friction materials is to reduce friction at low temperature and increase friction at high temperature, with small loss on ignition, and easy to volatilize in friction materials.
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.
