Effect of the Amount of a Lubricant and an Abrasive in the Friction Material on Friction Characteristics

Abstract

Frictional behavior of three automotive friction materials (brake pads) containing different amounts of antimony trisulfide () and zirconium silicate () were investigated using a front brake system. The friction materials were tested on a brake dynamometer (dyno) with gray cast iron rotors. The dynamometer(dyno) test simulated the dragging of a ehicle maintaining 70 km/h and vehicle stops from 100 km/h using 20 different combinations of initial brake temperature (IBT) and input pressure (IP). The results showed a strong influence of the relative amount of and in friction materials on friction characteristics. Friction stability was improved with the higher concentration of in the friction material. Torque variation during drag cycle was increased with an increase of the concentration in the friction material. Average friction coefficient and the wear rate of the friction material increased by using more aggressive friction materials containing more and less . Generation of the disk thickness variation (DTV) increased when friction materials with higher concentration of were used Careful examination of DTV change showed that aggressiveness of the friction material played an important role in determining torque variation.