What are the materials of non-asbestos friction materials? (superior)
The materials of non-asbestos friction materials are divided into the following categories:
1. Semi-metallic friction material.
Disc brake pads for passenger cars and heavy vehicles. Its material formula usually contains about 30% to 50% of ferrous metals (such as steel fiber, reduced iron powder, foam iron powder). The semi-metallic friction material is thus named. It is an asbestos-free material developed to replace asbestos at the earliest. Its characteristics: good heat resistance, high absorbed power per unit area, large thermal conductivity, and can be applied to the braking conditions of automobiles running at high speeds and heavy loads. However, it has disadvantages such as high braking noise and brittle corners.
2. Friction material.
In a broad sense, it refers to non-asbestos-non-steel fiber type friction materials, but the disc disc also contains a small amount of steel fibers. In most cases, the base material in NAO friction materials is a mixture of two or more fibers (inorganic fibers and a small amount of organic fibers). Therefore, NAO friction material is a non-asbestos mixed fiber friction material. Usually the brake pads are chopped fiber friction pads, and the clutch pads are continuous fiber friction pads.
3. Powder metallurgy friction material.
Also known as sintered friction material, it is made by mixing iron-based and copper-based powder materials, pressing them, and sintering them at high temperature. It is suitable for braking and transmission working conditions at relatively high temperature. Such as: braking and transmission of aircraft, trucks, and heavy construction machinery. Advantages: long service life; Disadvantages: high product price, large braking noise, heavy and brittle, and large dual wear.
4. Carbon fiber friction material.
It is a kind of friction material made of carbon fiber as reinforced material. Carbon fiber has the characteristics of high modulus, good thermal conductivity, and heat resistance. Carbon fiber friction material is one of the best performance among various types of friction materials. The carbon fiber friction plate has high absorption power per unit area and light specific gravity, which is especially suitable for the production of aircraft brake pads. It is also used in the brake pads of some high-end cars abroad. Because of its high price, its application range is limited and its output is small. In the carbon fiber friction material component, in addition to carbon fiber, graphite, a compound of carbon, is also used. The organic binder in the components also needs to be carbonized, so the carbon fiber friction material is also called carbon—carbon friction material or carbon-based friction material.
