Abstract
Wear resistant NiMo/Mo 2Ni 3Si intermetallic “in-situ” composites with a microstructure of ternary metal silicide Mo 2Ni 3Si primary dendritic, the long strip-like NiMo intermetallic phase, and a small amount of Ni/NiMo eutectics structure were designed and fabricated using molybdenum, nickel and silicon elemental powders. Friction and wear properties of NiMo/Mo 2Ni 3Si composites were evaluated under different contact load at room-temperature dry-sliding wear test conditions. Microstructure, worn surface morphologies and subsurface microstructure were characterized by OM, XRD, SEM and EDS. Results indicate that NiMo/Mo 2Ni 3Si composites have low fiction coefficient, excellent wear resistance and sluggish wear-load dependence. The dominant wear mechanisms of NiMo/Mo 2Ni 3Si composites are soft abrasion and slightly superficial oxidative wear.
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