Tribo-evaluation of Aluminium Based Metal ...

Al- Based metal matrix composites used for automobile brake pad applications are fabricated through P/M route using ‘Preform powder forging’ technology. Dry sliding wear behavior of Al-MMC based brake pads against cast iron disc is studied as per ECR R-90 regulation on Krauss machine tribo-tester. It was observed that the Al- based brake pads posses lower wear rate, same order of Coefficient of friction as in resin bonded brake pads, while the temperature rise is one third as compared with resin bonded brake pads. The vibration and judder of Al based brake pads is slightly higher in comparison to resin based brake pad. Thus the present study reveals that the development of Al-based metal matrix friction composites has a great potential in making automobile brake pads and may replace the existing resin bonded brake pads in varieties of applications. The fracture surface of the brake pad is studied under SEM and it was found that the constituents are uniformly distributed in friction layers as well as in backing plate.