Abstract
The present study investigated the effect of TiB2 on the tribological properties of CuSn10Bi3 bimetallic bearing materials. CuSn10Bi3 samples with different contents of TiB2 were fabricated by powder sintering technology. Their metallographic structures and tribological characteristics under different working conditions were analyzed and compared. The results showed that TiB2 refine the copper alloy grains, passivate the grain boundary edges and reduce the surface porosity of the sample. When the content of TiB2 is 1%, the wear rate under different oil conditions (oil-rich, oilless, and dry friction) is reduced by 42%-95%. The sharp decrease in the wear rate is attributed to the enhancement of the micro-grain structure of the copper alloy matrix material by TiB2 hard particles with antiwear properties, and the high hardness and high wear resistance of TiB2. The wear tracks were analyzed through SEM and EDS, and it was concluded that the addition of TiB2 enhanced the wear resistance.
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