Development history of friction materials
Friction materials can be roughly divided into the following stages:
(1) Before 1930, asbestos long fibers were mainly added with other thread weaving impregnation methods.
(2) In 1930, a flexible resin adhesive was developed, which has good thermal stability, making it possible to mix more fillers in the dry process, and developed drum brake pads. In the following 30 years, asbestos raw materials still dominate.
(3) In 1950, the American SKELLMAN Company took the lead in developing friction materials with iron powder, graphite and other fillers and resins as adhesives for hot pressing, that is, semi-metallic friction materials. In 1970, semi-metallic friction materials were used in disc brakes and are still widely used today
