How is molybdenum disulfide prepared?

Molybdenum disulfide is an inorganic substance with the chemical formula MoS2, which is the main component of molybdenite. Black solid powder with metallic luster.

How to prepare molybdenum disulfide

natural law

Molybdenum disulfide has excellent properties and broad application prospects, so a lot of research has been carried out on the preparation and application of nano-MoS2 at home and abroad.

MoS2 can be prepared by a natural method, namely the molybdenum concentrate purification method. This method is to remove the acid insoluble matter, SiO2, Fe, Cu, SiO2, Fe, Cu, SiO2, Fe, Cu, Impurities such as Ca and Pb are further refined to obtain nano-MoS2. The American Climax Molybdenum Company adopted this method to produce MoS2. The nano-MoS2 prepared by this method can maintain the natural MoS2 crystal form, has good lubricating performance, and is suitable for making lubricants. However, the purity of nano-MoS2 produced by natural method is not high, and the purification technology needs to be further improved. When the temperature is lower than 400 ℃, it is recommended to use MoS2 with lower cost when working in ordinary atmosphere. It has lubricating ability below 1300 ℃, and it is recommended to use MoS2 with lower cost.

chemical synthesis

Synthetic methods can produce sulfides with high purity, few impurities and fine particle size, and can prepare sulfides that meet different functional requirements. There are many preparation methods for nano-MoS2, such as thermal decomposition of ammonium tetrathiomolybdate, hydrogen sulfide or sulfur steam reduction, high-energy ball milling, carbon nanotube space confinement, hydrothermal synthesis, high-energy physical means and chemical methods. etc. In general, there are two preparation methods, one can directly react tungsten source or molybdenum source with sulfur source to obtain nano-MoS2, or first react tungsten source or molybdenum source with sulfur source to obtain a precursor, and then pass the precursor through an appropriate The method is decomposed or reduced to MoS2.

How is molybdenum disulfide prepared

Molybdenite concentrate can be prepared by heating with hydrochloric acid and hydrofluoric acid under direct steam, stirring repeatedly, washing with hot water, centrifuging, drying and pulverizing. The hydrogen sulfide gas is introduced into the ammonium molybdate solution to generate ammonium thiomolybdate. Add hydrochloric acid to convert into molybdenum trisulfide precipitate, and then centrifuge, wash, dry and pulverize. Finally, it can be obtained by heating to 950 °C for desulfurization.

Overview of molybdenum disulfide

Molybdenum disulfide molybdenum disulfide is an inorganic substance, the chemical formula MoS2, is the main component of molybdenite. Black solid powder with metallic luster, molybdenum disulfide is an inorganic substance, chemical formula MoS2, is the main component of molybdenum ore. Black solid powder with metallic luster and smooth feel. The specific gravity is 4.8, and the Mohs hardness is 1 to 1.5. Generally speaking, the friction coefficient is 0.05~0.09. The oil absorption value is 1~1.5. The melting point is 1185°C, and it is sublimated at 450°C. In the atmosphere, the temperature starts to oxidize gradually at about 400 °C, and as the particle size becomes finer, the oxidation temperature gradually decreases, and the oxide is molybdenum trioxide. Insoluble in dilute acid, alkali, solvent, petroleum, synthetic grease. It can be corroded by aqua regia, concentrated sulfuric acid and boiling concentrated hydrochloric acid. Chemical stability and thermal stability are strong. It does not react chemically with general metal surfaces and does not corrode rubber materials.

Application of molybdenum disulfide

Molybdenum disulfide is an important solid lubricant, especially suitable for high temperature and high pressure. It is also diamagnetic, can be used as a linear photoconductor and a semiconductor showing P-type or N-type conductivity, and has rectification and energy functions. Molybdenum disulfide can also be used as a catalyst for complex hydrocarbon dehydrogenation.

Also known as the "King of Advanced Solid Lubricants". Molybdenum disulfide is a solid powder made of natural molybdenum concentrate after chemical purification and changing the molecular structure. This product is black, slightly silver-gray, with metallic luster, smooth touch, insoluble in water. The product has the advantages of good dispersion and non-sticking. It can be added to various greases to form a non-stick colloidal state, which can increase the lubricity and extreme pressure of the grease. Also suitable for high temperature, high pressure, high speed and high load mechanical conditions to extend equipment life. The main function of molybdenum disulfide used in friction materials is to reduce friction at low temperature and increase friction at high temperature, and the loss on ignition is small. Volatile in friction materials.

Friction reduction: The particle size of molybdenum disulfide processed by supersonic jet pulverization is 325-2500 mesh, the particle hardness is 1-1.5, and the friction coefficient is 0.05-0.1, which can reduce friction when used for friction materials;

Increased friction: Molybdenum disulfide is non-conductive and there are copolymers of molybdenum disulfide, molybdenum trisulfide and molybdenum trioxide. When the temperature of the friction material increases sharply due to friction, the molybdenum trioxide particles in the copolymer expand with the increase of temperature and increase the friction force;

Antioxidant: Molybdenum disulfide is obtained through chemical purification and comprehensive reaction. Its pH value is 7-8, and it is slightly alkaline. It covers the surface of the friction material to protect other materials and prevent them from being oxidized, especially to make other materials not easy to fall off and enhance adhesion;

In addition, molybdenum disulfide can also become a new material for making transistors. Compared with graphene, which is also a two-dimensional material, the band gap of molybdenum disulfide is 1.8 eV, while graphene has no band gap. Therefore, molybdenum disulfide may have broad application space in the field of nanotransistors. In addition, the electron mobility of the monolayer molybdenum disulfide transistor can reach about 500 cm^2/(V•s), and the current switching rate can reach 1×10^8.

Molybdenum disulfide price

The price of molybdenum disulfide varies randomly with factors such as production costs, transportation costs, international conditions, exchange rates, and supply and demand in the molybdenum disulfide market. Tanki New Materials Co.,Ltd aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full range of customized services. If you are looking for molybdenum disulfide material, please feel free to contact for the latest price of molybdenum disulfide.

Molybdenum disulfide suppliers

As a global molybdenum disulfide supplier, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (zinc sulfide, tungsten sulfide, bismuth sulfide, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.