BaSO4-friction dust filler improves friction characteristic in non-asbestos brake pad composite

The use of inert filler in the brake pad is considered only to reduce the manufacturing cost. However, it can contribute to the improvement of friction characteristics in a certain composition. The experimental study investigates the friction characteristic of non-asbestos brake pad composite by combining BaSO<inf>4</inf> and friction dust as filler. Five samples with the volume fraction of BaSO<inf>4</inf> to friction dust (30:0; 25:5; 20:10; 15:15; and 10:20 respectively) have been prepared. The samples have been compacted under pressure 47MPa and heated at a temperature of 150 °C simultaneously for 15 min. Then, they have been post-cured at a temperature of 150 °C for 6 hours. The friction characteristic has been tested using a Chase friction machine based on SAE J661. Friction characteristics are evaluated in the condition of friction-baseline, frictionfade, friction-recovery, and wear. The result reveals that the sample with a combination of BaSO<inf>4</inf> and friction dust improves the second fade performance, the second recovery performance, the friction stability, and the wear resistance. Comprehensively, the optimal ratio BaSO<inf>4</inf> friction dust (20:10 vol.) has showed the lowest second fade performance (4.88), a good second recovery performance (113.69), and the highest friction stability (91.25). This combination has potential as a functionally feasible brake pad filler for brake reliability and safety. © 2019 Praise Worthy Prize S.r.l.-All rights reserved.