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Preparation and Application of molybdenum disulfide

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Molybdenum disulfide

It has a broad range of application and excellent properties, so much research has been conducted on the preparation of nano-MoS2 both 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 suitable for lubricants, as it has excellent lubrication properties and maintains the MoS2 crystal form. 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 cheaper 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, 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. In general, there are only two preparation methods. You can reach nano-MoS2 directly by reacting either a tungsten, molybdenum or sulfur source.


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: binder fiber, friction performance modulator, and filler. The friction performance modifiers fall into two different categories.

(1)

Anti-friction material:

Addition of this material can increase the material’s resistance to abrasion, reduce noise and reduce its coefficient of friction. Some of these materials are graphite (or molybdenum), lead, or copper.

(2)

Friction material

The friction coefficient can be increased by adding this material. Among the most common inorganic materials are metals, their oxides, and certain fillers. The friction modifier is primarily 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 and 20 microns. It has an excellent dispersion effect, a frictional coefficient as low as 0.05, and good anti-friction properties.


Increased friction

The friction temperature causes molybdenum dioxide to oxidize and form molybdenum trioxide, which expands when temperature increases. This plays a key role in increasing the friction.


Anti-oxidant, anti-falling and other:

Molybdenum Disulfide is acidic. It protects the friction material from being oxidized by covering the surface.


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. As the fineness increases the specific surface increases and the specific density decreases.

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molybdenum disulfide

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