High-Temperature Tribological Performance of TiAl Matrix Composites Reinforced by Multilayer Graphene

摘要

In order to acquire deep insights into understanding the lubricative properties of multilayer graphene (MLG) for MLG-reinforced TiAl matrix composites (GTMC), the high-temperature tribological performance of GTMC is investigated for the first time from 100 to 700 degrees C using a rotating ball-on-disk configuration. Tribological results indicate the evolution of lubricative properties of MLG with testing temperature. In the testing temperature range from 100 to 550 degrees C, MLG presents the excellent lubricative properties due to its low shear and highly protective nature. Between 550 and 600 degrees C, the transition of lubricative properties of MLG occurs. Above 600 degrees C, MLG loses the lubricative properties due to its oxidation but improves the oxidation resistance of GTMC by sealing the grain boundaries and inhibiting the influx of oxygen through grain boundaries.