Preparation and Application of molybdenum disulfide

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Molybdenum disulfide It has great properties and a broad range of application possibilities, so much research has been conducted on the preparation of nano-MoS2 and its application at home as well as abroad.
Natural law
MoS2 may be prepared naturally, using the molybdenite concentrat purification method. The method involves removing the acid-insoluble matter (SiO2, Fe, Copper, and molybdenite) from a molybdenum concentration of high quality through physical and chemical action. The nano-MoS2 obtained is refined further to remove impurities, such as Ca and Cu. The nano-MoS2 produced by this method is capable of maintaining the MoS2 crystal form, it has good lubricating properties, and can be used to make lubricants. The nano-MoS2 that is produced using the natural method has a low purity, and purification technologies need to be improved. If the temperature of the atmosphere is less than 400, the lower-cost MoS2 is recommended. MoS2 offers a better lubricating effect below 1300 degrees.
Chemical synthesis
Synthetic methods are able to prepare sulfides in a variety of functionalities. They can also produce sulfides containing high purity and fewer impurities. Synthetic methods have always been popular for producing nano-sulfides. There are a number of methods to prepare nano MoS2, such as the thermal decomposition of ammonium, the reduction of hydrogen sulfide, or sulfur, using high energy ball milling, space confinement with carbon nanotubes and hydrothermal synthesis. There are two main preparation methods. You can reach nano-MoS2 directly by reacting a Molybdenum or a Tungsten source with sulfur, or you can use a reaction to first obtain a precursor and then reduce it to MoS2.

Useful Information
As an effective anti-friction agent, molybdenum disulfide The raw materials of brake pads include four parts: binder, reinforcing fiber, friction performance modifier, and filler. Four parts make up the composition of brake pads: reinforcing fibers, binder, friction performance modifiers, and filler. The friction performance modifiers fall into two different categories.
(1) Anti-friction material: Addition of this material can increase the abrasion resistance of the material, reduce noise levels, and lower the coefficients friction. Such materials are mainly graphite (or molybdenum), lead, or copper.
(2) Friction material The friction coefficient can be increased by adding this material. Most inorganic materials and metals and oxides of some metals are included in this category. The friction modifier is mainly used to adjust the thermal stability and the working stability of a material.
Molybdenum diulfide offers good dispersibility and wear resistance as well as noise reduction. Addition of molybdenum disulfide to brake pads has the following main functions:
Anti-friction: Molybdenum Disulfide processed through jet pulverization can have a particle size between 1.5-20 m, with a frictional coefficient as low as 0.05. This product has excellent dispersion and anti-friction properties.
Increased friction The friction material becomes more aggressive due to the increased friction temperature. Molybdenum dioxide oxidizes into molybdenum trioxide, which expands along with the increase in heat.
Anti-oxidant, anti-falling and other: Molybdenum Disulfide is acidic. It protects the surface from oxidation, is difficult to remove, and adheres strongly.
Expansion: The internal voids can increase when the friction material is heated to a high temperature. However, molybdenum oxide can compensate for this.
Reduce the specific gravity The specific gravity for molybdenum diulfide is 4.5 to 5.2. The fineness increases the surface area, which in turn decreases the specific gravity.

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