Molybdenum disulfide material has excellent lubricating properties

Preparation method of molybdenum disulfide

In the application of molybdenum disulfide, the study of its preparation method is the primary issue. Only by preparing MoS2 with good morphology and excellent performance can it be used well, creating unlimited development opportunities for the application of its nanoparticles. There are many methods for preparing molybdenum disulfide, generally including hydration heat method, chemical vapor deposition method, surfactant promotion method and physical mechanical method.

Chemical vapor deposition

The chemical vapor deposition method has simple process, high product purity and low production cost. It can prepare molybdenum disulfide with high quality, large size and excellent performance. It is a relatively common method. Preparation of molybdenum disulfide nanomaterials. He Dawei et al. Large-size single crystal molybdenum disulfide was prepared on a sapphire substrate by a simplified chemical vapor deposition method under normal pressure. Molybdenum disulfide is a regular triangular monolayer with a side length of about 50 μm.

Although this method has many practical applications, HS may be present in the actual preparation process, so it is necessary to deal with the exhaust gas accordingly. In addition, in this link, the appearance of the product is under gas flow and pressure. Under the fluctuation of dry batches, the forms presented are different, so the law also needs to continue to research and expand new fields and approaches.

 Physical Mechanical Law

For physical and mechanical methods, its control is simple and the product output efficiency is high. Deng Baihan et al. 100um linear graphene and 10um MoS2 were prepared by micromechanical force method, and Raman spectroscopy was used as a means to identify the number of graphene layers. Data processing, fitting and theoretical analysis were carried out. This MoS2 spherical structure containing basic lubricants is very good in terms of lubricating effect. In the actual output link, the repeatability is poor and cannot meet the demands of large-scale output.

Hydration heating method

In the actual application process, for nano-molybdenum disulfide, the highest preparation method and the widest range is the hydration thermal method. The material developed by nano-molybdenum disulfide has small specifications and excellent wear resistance.

In order to prepare low-cost, high-performance non-platinum hydrogen evolution electrocatalysts, Sun Jiaojiao and other materials used ammonium molybdate tetrahydrate and L-cysteine as raw materials, and used the hydrothermal method to operate at 200°C for 24 hours. The preparation process of molybdenum disulfide is described.

For the hydrothermal method, with its short reaction cycle, simple operation, environmental protection, and high product purity, it has won the unanimous praise and love of the majority of inquirers. It has become a key part of nano-molybdenum disulfide research and development.

Surfactant

Auxiliary method The surfactant auxiliary method has a stable reaction process and is accompanied by dispersion, which can finely control the appearance of the product and has great development potential. Therefore, the structure of nanomaterials around MoS2 can be controlled and designed by selecting various types of surfactants.

Molybdenum disulfide as a lubricant additive

 Because molybdenum disulfide has a very special spherical structure that can roll and disperse in lubricating media, it is often used as a lubricating additive for large-scale applications. Sichuanese such as Jin Yufu injected molybdenum disulfide lubricant into the lubricating oil, which greatly improved the lubrication level of the base oil. While ensuring the continuous and stable operation of each equipment, it also has the effect of energy saving and emission reduction.

Hu Kunhong et al. The tribological properties of different forms of molybdenum disulfide particles were examined. Under low load and low speed, hollow spherical MoS2 (hollow balls) and flake nano MoS2 (nano flakes) can improve the anti-friction and anti-wear properties of the base oil. Under high load and high speed, the hollow sphere still maintains good anti-friction and anti-wear properties. The conclusion is that it is different from the conventional MoS2, its performance in extreme pressure and lubrication loss has better performance.

In view of the large amount of strain on the axle during the press-fitting process of a certain type of locomotive wheel, Ge Rongxi, through field practice, proposed the use of molybdenum disulfide lubricant as a wheel-fitting press-a suitable lubricating medium, to completely solve the problem of abnormal pulling axles. Experiments have proved that the nano-molybdenum disulfide material has excellent lubricating properties.

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, smooth to the touch. The specific gravity is 4.8, and the Mohs hardness is 1 to 1.5. In general, the 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 around 400°C, and as the particle size becomes finer, the oxidation temperature gradually decreases, and the oxide is molybdenum trioxide. It does not dissolve in dilute acid, 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. It does not chemically react 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 the functions of rectification and energy conversion.Molybdenum disulfide can also be used as a catalyst for the dehydrogenation of complex hydrocarbons.

It is also known as the"king of advanced solid lubricants."Molybdenum disulfide is a solid powder made from natural molybdenum concentrate after chemical purification and then changing the molecular structure.This product is black with a slight silver gray,metallic luster,slippery to the touch,and insoluble in water.The product has the advantages of good dispersibility and non-sticking.It can be added to various greases to form a non-sticky colloidal 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 equipment life.The main function of molybdenum disulfide used in friction materials is to reduce friction at low temperatures, increase friction at high temperatures,and have a small loss on ignition.It is volatile in friction materials.

Anti-friction: Molybdenum disulfide processed by supersonic jet pulverization has a particle size of 325-2500 mesh, micro-particle hardness of 1-1.5,and friction coefficient of 0.05-0.1,so it can reduce friction when used in friction materials;

Increase friction: 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 as the temperature rises to increase the friction;

Anti-oxidation: Molybdenum disulfide is obtained through chemical purification and comprehensive reaction.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 make other materials not easy to fall off and enhance the adhesion;

In addition,molybdenum disulfide can also become a new material for making transistors.Compared with graphene,which is also a two-dimensional material,molybdenum disulfide has an energy band gap of 1.8 eV,while graphene does not have an 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 up to about 500 cm2/(V•s),and the current switching rate can reach 1×10^8.

The price of molybdenum disulfide

The price of molybdenum disulfide varies randomly with production costs, transportation costs, international conditions, exchange rates, and the supply and demand relationship in the molybdenum disulfide market. Tanki New Materials Co.,Ltd aims to help all 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.

Suppliers of molybdenum disulfide

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.