Multi-metal sulfide pre-blend combination on the tribological performance of the brake friction material

Purpose - The purpose of this study is the influence of various combinations of metal sulfides on the tribological performance of brake pads. Design/methodology/approach - Three brake pads were prepared using the possible combination of any two of the solid lubricants from Bismuth trisulfide (Bi2S3); Tin disulfide (SnS2) and Antimony trisulfide (Sb2S3) are chosen and blended with molybdenum disulfide and graphite. The tribological performance was compared with the brake pad containing aftermarket sulfide mixture. The tribological performance parameters such as performance coefficient of friction, fade percent, recovery percent, wear thickness loss, time is taken to reach the maximum temperature and fluctuation of friction were investigated using Chase tribometer adopting IS 2742 Part-4 (1994) test procedure. Findings - The friction stability of the brake pad with 4Wt% of MoS2, Bi2S3 and SnS2 was observed to be better, but it showed poor wear performance and aggressive towards the rotor, whereas the brake pad contained 4Wt% of MoS2, Bi2S3 and Sb2S3 exhibited improved wear performance. Originality/value - This paper explains the influence of the combination of multiple metal sulfide in the tribological performance of the copper-free brake friction composite.

Automated summary

This study investigates the influence of various combinations of metal sulfides on the tribological performance of brake pads. The results show that brake pads containing MoS2, Bi2S3, and SnS2 exhibit better friction stability but poorer wear performance, while those containing MoS2, Bi2S3, and Sb2S3 demonstrate improved wear performance.