Effect of phenolic resin on the friction behaviors with respect to temperature and operating speed

Brake friction materials are composed of four components, namely the reinforcing fibres, binders, fillers and frictional additives. The phenolic resin is used as the binder to hold the composition together and maintain the structural integrity of the brake material during braking process. Three semi-metallic material formulations were prepared by powder metallurgy process. Selecting sample B as the base formulation, the phenolic resin percentage volume in sample A is decreased by 50% while that in sample C is increased by 50%. The composition of the other ingredients in sample A and C are, respectively proportionally increased and decreased according to the base formulation. Each sample was tested using inertia dynamometer in accordance with recommended practice of SAE J2522 test procedures. The effect of different phenolic resin percentages on friction behaviour with respect to speed and temperature was investigated and discussed in this paper