Application and Function of Molybdenum Disulfide in Brake Pad
views, Updated: June 08, 2020 by aemmetal
Brake pad refers to the friction material fixed on the brake drum or brake disc rotating with the wheel. The friction lining and friction pad bears external pressure and produces a friction effect to achieve vehicle deceleration. Brake pads' raw materials are composed of four parts: binder, reinforcing fiber, friction modifier, and filler.
There are two kinds of friction performance modifiers: (1) antifriction materials: its addition can improve the friction resistance of materials, reduce noise, and reduce the friction coefficient. Such materials mainly include graphite, molybdenum disulfide, lead, copper, etc. (2) Friction material: it can increase the material's friction coefficient. Most inorganic fillers and some metals and their oxides belong to this category. Friction performance regulator mainly regulates the thermal stability and working stability of materials.
As mentioned, molybdenum disulfide powder is often added to the brake pad as antifriction material. Why is that? Because molybdenum disulfide powder has the advantages of good dispersion, wear-resistance, and noise reduction. It can be added to the brake pad as a friction performance regulator. At the same time, it has the following functions:
The particle size of the molybdenum disulfide is 1.5-20 μ m, the friction coefficient is 0.05, the dispersion performance is excellent, and the friction reduction effect is good.
2. Increased friction
When the friction temperature of friction material increases sharply, molybdenum trioxide appears in the oxidation of molybdenum disulfide, which expands with the increase of temperature and plays a role in increasing friction.
3. Anti-oxidation and anti-shedding
Molybdenum disulfide is slightly acidic, covering the surface of friction materials, protecting other materials from oxidation, making it hard to fall off, and has strong adhesion.
When the friction materials are in the braking's high-temperature state, many low-temperature materials such as fillers and resins are easily carbonized and lost. As a result, increasing the materials' internal gap, while molybdenum trioxide can make up for it better.
5 Reducing specific gravity
The specific gravity of the molybdenum disulfide crystal is 4.5-5.2. With the increase of fineness, the specific surface area is also increased, the specific gravity is reduced, and the brake pad's weight is reduced to a certain extent.
Moreover, the special molybdenum disulfide powder developed by unique technology can effectively improve the wear resistance and working stability of brake pad products. AEM provides molybdenum disulfide powder for brake pads. If you are interested, please visit the product page of molybdenum disulfide powder to explore further.