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. 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 lubricating effect below 1300 degrees.
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 hydrogen sulfide, or sulfur-vapor reduction method. Other methods include high-energy ball-milling, carbon nanotube confinement space method, hydrothermal syntheses, high-energy physical, and chemical method combinations, etc. Generally, there are only two methods. You can reach nano-MoS2 directly by reacting a Molybdenum or tungsten with sulfur, or you can use a precursor and then decompose it or reduce it to MoS2.
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 modifier 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. Graphite, molybdenum, disulfide of copper, lead and other materials are some examples.
(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 mainly used to adjust the thermal stability and the working stability of the 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 microns. It has an excellent dispersion and anti-friction performance.
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 temperature increase.
Anti-oxidant, anti-falling and other: Molybdenum Disulfide is slightly alkaline. It protects the friction materials by covering the surface. This prevents other materials from oxidizing.
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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