SiC particle reinforced Al matrix composites brazed on aluminum body for lightweight wear resistant brakes

Aluminum alloys are well known light-weight alloys and very interesting materials to optimize the strength/ weight ratio in order to reduce automotive vehicle weight, fuel consumption and CO2 emissions; unfortunately, they are also relatively soft and therefore cannot be used for high wear applications. The aim of this work was to develop an aluminum alloy brake disc with wear-resistant SiC particle reinforced aluminum matrix composites (SiC/Al) joined on to its surface. Different approaches based on brazing or shrink fitting joining technologies were used to join SiC/Al to the aluminum alloy surface. A functional graded structure was built by brazing thin layers of aluminum matrix composites reinforced with progressively higher amount of SiC particles by using a Zn-Al based alloy as joining material. Several samples were prepared by shrink fitting and brazing: 40 mm x 40 mm x 10 mm samples and a 100 mm diameter brake disc with 68% SiC particle reinforced Al matrix surface and aluminum alloy A365 body. Tribological tests demonstrated that an aluminum alloy brake disc with wear-resistant SiC particle reinforced aluminum matrix composites (SiC/Al) brazed on its surface is a promising technical opportunity.

Automated summary

This work aimed to develop an aluminum alloy brake disc with a wear-resistant SiC particle reinforced aluminum matrix composites (SiC/Al) on its surface. Different joining technologies, such as brazing and shrink fitting, were used to connect SiC/Al to the aluminum alloy. A functional graded structure was created by gradually increasing the SiC particle content in the aluminum matrix composites. Tribological tests demonstrated that the aluminum alloy brake disc with SiC/Al brazed on its surface offers promising technical opportunities.