Abstract
Cu-graphite composites (CGCS) find extensive applications in electrical contact components. However, due to insufficient wetting between Cu and graphite, their bonding remains weak. Additionally, the Cu coating on the surface of graphite in Cu-coated graphite particles used to fabricate CGCS tends to segregate during sintering, which leads to defects such as porosity. To address these issues, this study incorporated Ti2AlC into CGCS sintered at 980 °C using a pneumatic sintering process. Subsequently, the microstructure and properties of the composites were examined and analyzed. The findings indicated that incorporating Ti2AlC prevented severe segregation of the Cu coating on the graphite surface during sintering, maintaining complete coverage of the graphite particles by the Cu matrix. In addition, the development of a TiC layer increased the interface bonding strength between the Cu matrix and graphite from 0.40 GPa to 5.00 GPa. Besides, CGCS with Ti2AlC exhibits better mechanical properties and tribological properties; their hardness, compressive strength, and wear rate are 64.5 HV, 269 MPa, 1.378×10-5 mm3/N·m, respectively.
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