Mechanical and tribological property of Cu/CrB2 composites under dry sliding condition

Abstract

Dry sliding friction and wear test of Cu/CrB2 composites manufactured by ex situ method was studied, and the mechanical properties were also measured to assistant analysis wear behaviour. When CrB2 content is 3 vol.-%, both the mechanical and tribological properties reach the maximum values, viz., 113 HV, 304 MPa and 9.1 × 10−5 mm3 N−1 m−1 of the normal load is 10 N, higher 71.2%, 33.3%, lower 52.8% than that of pure Cu, respectively, which can be ascribed to the increase of hardness and the transfer of main wear mechanisms of Cu matrix from adhesive to abrasive wear by the addition of CrB2. Further increase CrB2 content to above 5 vol.-%, wear resistance would decreases since the pulled out of CrB2 particles.