What is brake pad friction material
Brake pads are also called brake pads, and the main function of the friction material is to friction with the surface of the brake disc when the car is braking to achieve the braking effect. Therefore, it is well deserved to be the most important component of the brake pad structure.
In general, the friction material of brake pads is mainly composed of 4 parts, the basic material, the filling material, the grinding agent and the reinforcing fiber. The proportion of these materials in different products varies, depending on the application and the coefficient of friction. In addition, the friction materials used by different grades of cars and disc brake pads and drum brake pads are not the same. For the brake friction sheet, the most important thing is the formula of the friction material. The final effect, wear resistance, temperature resistance and other properties of the brake pads will depend on the relative ratio between the different components.
At present, the common friction materials on the market can be divided into four kinds from the basic material: asbestos, semi-metal, low metal, NAO ceramic formula (that is, asbestos-free organic matter type). Let's take a look at these brake pads of different materials.
01 Asbestos formula: It has been banned for environmental reasons.
02 Semi-metal mixture material formula: "semi-metal" mixture brake pads mainly use 30-50% "black metal" as a reinforcing fiber and an important mixture. The main advantage lies in its excellent heat dissipation capacity and good thermal decay performance. However, because the hardness is relatively high, it is easy to produce noise.
03 Low metal mixture brake pads: "low metal" mixture brake pads are mainly made of black metals and non-ferrous metals within 10% as reinforcement fibers. Main advantages: moderate hardness, good braking comfort, high braking sensitivity, low braking noise.
04 Ceramic formula: NAO/ ceramic formula is the current development trend of brake pad friction material formula research and development. Early NAO formulations were developed to replace traditional asbestos materials, mainly using glass fiber, aramid fiber or other fibers (carbon, ceramics, etc.) as reinforcement materials.
The advantages of the NAO/ ceramic formula are good brake comfort, low brake noise, long service life, and more clean and environmentally friendly. However, due to the characteristics of the material itself, the braking force is relatively low, and it is generally used in Japanese and Korean models; Some heavy models such as European and American cars are not suitable for pure ceramic formula.
