High temperature wear resistance of Fe–28Al–5Cr alloy and its composites reinforced by TiC

The high-temperature tribological behaviour of Fe–28Al–5Cr alloy and its composites containing TiC was investigated against a Si3N4 ceramic from 25 to 800 °C. The high-temperature wear resistance of the materials was significantly improved by the addition of TiC, which was attributed to the high hardness of the composites, as well as the support role of hard TiC. The oxidation played an important role to friction and wear.

► TiC improves wear-resistance of Fe–28Al–5Cr alloy at high temperature obviously.
► Wear rate of the composite with 50% TiC is 28–35 times lower than that of Fe–28Al–5Cr alloy.
► Enhanced wear-resistance of composites originates from high hardness and high strength.
► At 200–800 °C, the oxides play an important role in friction process.
► Wear resistance significantly increases with rising TiC amount.