Preparation and Application of molybdenum disulfide

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Molybdenum disulfide It has broad applications and excellent properties, so much research has been conducted on its preparation and use 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 high-quality Molybdenum Concentrate through physical and chemical action. The nano-MoS2 obtained is refined further to remove impurities, such as Ca and Cu. This nano-MoS2 is able maintain the MoS2 crystal form, has excellent 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 lubrication 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, including ammonium trithiomolybdate thermal oxidation, hydrogen sulfide, sulfur vapor reduction, high energy ball milling, carbon nanotube confinement, hydrothermal synthesis, high energy physical method and chemical combination, among others. Generally, there are only two 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: binders, reinforcing yarn, friction performance modifiers, and fillers. The friction performance modifiers fall into two different categories.
(1) Anti-friction material: Addition of this material can increase the abrasion-resistance, reduce noise levels, and lower the coefficients of friction. The main materials are graphite (or molybdenum), lead, copper and so forth.
(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 material’s thermal and working stability.
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 microns. It has an excellent dispersion and anti-friction performance.
Increased friction The friction temperature causes molybdenum dioxide to oxidize and form molybdenum trioxide. It expands when temperature increases.
Anti-oxidation, anti-falling and other: Molybdenum Disulfide is a little 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 of the crystals increases the surface area, which in turn decreases the specific gravity.

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