Explanation

It is also called friction materials. A special materials that converts kinetic energy into heat energy by friction and absorbs or dissipates it to reduce the relative motion speed of the grinding surface. The friction coefficient of such materials shall be as high as possible and shall not change with the working conditions. In order to adapt to the temperature rise caused by strong friction heat, it should have high thermal stability and low wear rate. There are also high requirements for controlling and reducing frictional noise. A single materials often does not have the above properties and must develop composite friction materials. friction materials can be divided into three categories: one is formed by bonding resin with fiber, granular friction reinforcement component and friction modifier, and the most commonly used fiber is asbestos, which has been replaced by potassium titanate and other fibers due to its environmental pollution; The second is metal products, such as foundry high phosphorus cast iron brake shoes or powder metallurgy products, such as friction materials composed of quartze, corundum or mullite powder and copper alloy powder; The third type is carbon/carbon composhes, which bears high temperature above 2000 ° C without bating or deformation, and has a special position in friction materials. It is divided into six levels based on friction speed, nominal contact pressure, lining bearing temperature, and overall temperature of the worn surface. Mainly used as brake pads and brakes.

Classification