Tribo‐performance assessment of brake friction composites prepared from agro‐industrial‐sea wastes using pin‐on‐disc

Abstract

AbstractIn this work, eco‐friendly brake friction composites were developed using walnut shell powder‐fly ash‐white ark shell powder (agro‐industrial‐sea waste). The waste materials content in the friction composites varied from 33 to 53 wt% including a fixed content of fly ash (30 wt%) and walnut shell powder (3 wt%) and a varying amount of white ark shell powder (WASP) from 0 to 20 wt% with a step of 5 wt%. The fabricated specimens were characterized for tribo‐performance and compared with commercial brake lining specimen (CBLS) in compliance with ASTM G99 standards using pin‐on‐disc test setup under dry conditions. The specimens were tested for the disc speed varying from 500 to 2000 rpm under 50 and 150 N of normal loads. The friction coefficients and volume loss of the fabricated specimens were found insensitive to the compositional changes and highly sensitive to the normal load and disc speeds. SEM‐EDS analysis showed the frequent formation of friction films at higher disc speed and integration and disintegration of contact plateaus responsible for the changes in the friction and wear behavior. The direct comparison between the friction coefficient and volume loss indicated that 10 wt% of WASP in compensation with BaSO4 may be used to develop the brake friction composite.Highlights Brake friction composites prepared from the waste materials offered μ‐values from 0.31 to 0.6 in comparison with the CBLS. Friction coefficient dropped significantly at higher disc speed. Morphological and elemental analysis supported in estimating the probable friction and wear mechanisms.