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The physical and chemical properties and preparation method of molybdenum disulfide MoS2 powder

2021-09-18 10:45:14  News

Overview of molybdenum disulfide

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

The physical and chemical properties of molybdenum disulfide

The main component of molybdenite. Black solid powder with metallic luster. Chemical formula MoS2, melting point 2375℃, density 4.80g/cm3 (14℃), Mohs hardness 1.0~1.5. [1] It begins to decompose at 1370°C, and decomposes into metallic molybdenum and sulfur at 1600°C. It starts to be oxidized when heated at 315°C in the air, and 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, but it is soluble in aqua regia and boiling concentrated sulfuric acid. Slowly oxidized at 400 ℃ to generate molybdenum trioxide:

2MoS2+ 7 O2→ 2 MoO3 "+ 4 SO2" can be used to test the generated molybdenum trioxide with a ferro-titanium reagent. First, the product is treated with sodium hydroxide or potassium hydroxide solution (the principle is to convert molybdenum trioxide into molybdate), and then the titanium iron reagent solution is added dropwise, which will react with the generated sodium molybdate or potassium molybdate to produce gold Yellow solution. This method is very sensitive, and trace amounts of molybdate can be detected. And if there is no molybdenum trioxide generated, the solution will not produce golden yellow, because molybdenum disulfide does not react with sodium hydroxide or potassium hydroxide solution.

The physical and chemical properties and preparation method of molybdenum disulfide MoS2 powder

Molybdenum disulfide can react with chlorine when heated to produce molybdenum pentachloride:

2 MoS2+ 7 Cl2→ 2 MoCl5+ 2 S2Cl2

Molybdenum disulfide and alkyl lithium react under control to form an intercalation compound (interlayer compound) LixMoS2. If it reacts with butyllithium, the product is LiMoS2.

Molybdenum disulfide has a high content of active sulfur, which is easy to cause corrosion to copper. It is discussed in many books and papers on lubricant additives. In addition, when the parts made of copper and its alloys need to be lubricated, it is not impossible to use molybdenum disulfide lubricating products, but also to add copper corrosion inhibitors.

Preparation method of molybdenum disulfide

Natural law

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

MoS2 can be prepared by the natural method, namely the molybdenite concentrate purification method, which is to remove the acid insoluble matter, SiO2, Fe, Cu, Impurities such as Ca and Pb are further refined to obtain nano-MoS2. The American Climax Molybdenum Company has adopted this method to produce MoS2. The nano-MoS2 made by this method can maintain the natural MoS2 crystal shape, has good lubricating performance, and is suitable for making lubricants. However, the purity of the nano-MoS2 produced by the 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 the lower cost MoS2 when working in the ordinary atmosphere. It has the lubricating ability below 1300 ℃, and the lower cost MoS2 is recommended.

Chemical synthesis

The synthetic method can produce sulfides with high purity, less impurities, and fine particle size, and can prepare sulfides that meet different functional requirements. Therefore, the production of nano-sulfides by synthetic methods has always attracted much attention. There are many methods for preparing nano-MoS2, such as ammonium tetrathiomolybdate thermal decomposition method, hydrogen sulfide or sulfur vapor reduction method, high-energy ball milling method, carbon nanotube space confinement method, hydrothermal synthesis method, high-energy physical method and chemical method combination and many more. Generally speaking, there are two preparation methods. You can directly react a tungsten source or a molybdenum source with a sulfur source to obtain nano-MoS2, or first react a tungsten source or a molybdenum source with a sulfur source to obtain a precursor, and then pass the precursor through an appropriate Method to decompose or reduce to MoS2.

Molybdenum disulfide MoS2 application

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 a rectifying and energy function. Molybdenum disulfide can also be used as a catalyst for the dehydrogenation of complex hydrocarbons.

Also known as "the king of advanced solid lubricants." Molybdenum disulfide is a solid powder made from natural molybdenum concentrate through chemical purification and changing the molecular structure. This product is black, slightly silver-gray, metallic luster, smooth to the touch, and insoluble in water. This product has the advantages of good dispersibility and non-stickiness. It can be added to various greases to form a non-stick gel state, which can increase the lubricity and extreme pressure of the grease. It is also suitable for high-temperature, high-pressure, high-speed, and high-load mechanical working conditions to extend the life of the equipment. The main function of molybdenum disulfide in friction materials is to reduce friction at low temperatures and increase friction at high temperatures, resulting in a small loss on ignition. It is volatile in friction materials.

Anti-friction property: Molybdenum disulfide particle size 325-2500 mesh, particle hardness 1-1.5, friction coefficient 0.05-0.1, crushed by supersonic jet, can reduce friction when used in friction materials;

Increase friction: Molybdenum disulfide does not conduct electricity. There are copolymers of molybdenum disulfide, molybdenum trisulfide and molybdenum trioxide. When the friction material rises sharply due to friction, the molybdenum trioxide particles in the copolymer expand with the increase in temperature to increase the friction;

Anti-oxidation: Molybdenum disulfide is obtained by chemical purification and comprehensive reaction, and its PH value is 7-8, which is slightly alkaline. It covers the surface of the friction material to protect other materials and prevent them from being oxidized, especially to prevent other materials from falling 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 energy band gap of molybdenum disulfide is 1.8 eV, while graphene has no energy band gap. Therefore, molybdenum disulfide may have a broad application space in the field of nano-transistors. Moreover, the electron mobility of a single-layer molybdenum disulfide transistor can reach about 500 cm^2/(V•s), and the current switching rate can reach 1×10^8.

Molybdenum disulfide MoS2 price

The price of molybdenum disulfide MoS2 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 set of customized services. If you are looking for molybdenum disulfide materials, please feel free to contact to get the latest price of molybdenum disulfide.

Molybdenum disulfide MoS2 supplier

As a global supplier of molybdenum disulfide MoS2, 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.

Parameters of molybdenum disulfide MoS2 powder:
MoS2MoO3InsolublesFeSiO2H2OOilAcid Value
99%0.05%0.26%0.14%0.05%0.08%0.10%0.54


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