Why molybdenum disulfide is an important solid lubricant?
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Author : Lzh
Update time : 2022-12-14 18:42:47
What is molybdenum disulfide Molybdenum disulfide is insoluble in water, dilute acid and concentrated sulfuric acid, generally insoluble in other acids, alkalis and organic solvents, but soluble in aqua regia and boiled concentrated sulfuric acid. Slow oxidation occurs at 400 ℃ to generate molybdenum trioxide. 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 solution, which will react with the generated sodium molybdate or potassium molybdate to produce the golden yellow solution. This method is very sensitive, and trace molybdate can be detected. If molybdenum trioxide is not formed, the solution will not produce golden colour because molybdenum disulfide does not react with sodium hydroxide or potassium hydroxide solution. Molybdenum disulfide reacts with alkyl lithium under control to form an embedded compound (intercalation compound) LixMoS2.
Preparation and method 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. It can be prepared by adding hydrochloric acid to transform it into molybdenum trisulfide precipitation, centrifuging, washing, drying, crushing, and finally heating to 950 ° C for desulfurization. The preparation methods are as follows: 1. Natural method, the world's molybdenum resources exist in the form of molybdenum sulfide, and China's molybdenum ores are mainly associated with tungsten molybdenum and gold copper. Molybdenum sulfide is flotation purified in the selected way. The national standard purity is 40% - 50% (here refers to the atomic content of molybdenum, 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. 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, and there will be 1.9 sulfur atoms+1 molybdenum atom or 2.1 sulfur atoms+1 molybdenum atom. Therefore, the lubrication is unstable.
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 a semiconductor showing P or N conductivity, and has the function 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 lubricants". Molybdenum disulfide is a solid powder made from natural molybdenum concentrate powder after chemical purification and changing the molecular structure. The product is black with silver grey colour, has a metallic lustre, has a greasy feeling when touching, and is insoluble in water. The product has the advantages of good dispersion and non-adhesion. It can be added to various oils to form a colloidal state that will not adhere, which can increase the lubricity and extreme pressure of the oil. It is also suitable for the mechanical working state of high temperature, high pressure, high speed and high load, which can extend the service life of the equipment.
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 any time.
