Friction material binder is a key constituent part of friction material which can affect thermal aging performance, recovery capacity, and friction and wear properties and mechanical properties. It includes hot thermosetting material, thermoplastic material, rubber and compound material and so on. In general, the car friction material is using a hot thermosetting binder. And its actual applicability of phenolic resin, melamine, epoxy, silicone, and polyamide resin and so on. The phenolic resin and modified resin can be used broadly. The purpose of modified resin is to improve high temperature performance. In order to improve the high temperature performance of binder, the polyimide resin is used broadly in the advanced car friction material.
Reinforced fiber is an important part of friction material. Traditional material adopts asbestos. Semi-metallic friction material adopts steel fiber meanwhile it adds little copper fiber. Nowadays, the kinds of reinforcing fibers are getting more and more popular. Most notable is the Kevlar material. The organic fiber can reduce the material density, reduce the abrasion loss and meanwhile it can reduce the friction coefficient. In order to improve the stable and the affinity performance of friction material, in practical applications, it is available to use multiple fibers.
Friction performance modifier can be mainly divided into two groups: one is for friction moderating: In general, Mohs hardness of this group is less than 2, which can improve the wear resistance and reduce the noise and friction coefficient. The other is for friction increasing: Mohs hardness of this group is more than 4, which can increase friction coefficient. Most inorganic filler and metal oxide arrester are belonging to this friction coefficient. The friction performance modifier can improve the stable of this material.
Filler works in many ways, such as copper powder. It can improve the pivoting friction torque and stable the friction coefficient and reduce the damage of mating plate. It may promote the density of the material with added barium sulfate.
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