Abstract
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 °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 °C, MLG presents the excellent lubricative properties due to its low shear and highly protective nature. Between 550 and 600 °C, the transition of lubricative properties of MLG occurs. Above 600 °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.
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