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 refined the copper alloy grains, passivated the grain boundary edges, and reduced the surface porosity of the sample. When the content of TiB₂ was 1%, the wear rate under different oil conditions (oil-rich, oilless, and dry friction) was reduced by 42–95%. The sharp decrease in the wear rate was attributed to the enhancement of the micrograin 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 using scanning electron microscopy and energy-dispersive spectroscopy, and it was concluded that the addition of TiB₂ enhanced the wear resistance.

摘要

本研究调查了TiB ₂对CuSn10Bi3 双金属轴承材料摩擦学性能的影响。采用粉末烧结技术制备了不同TiB ₂含量的CuSn10Bi3样品。分析比较了它们在不同工况下的金相组织和摩擦学特征。结果表明，TiB ₂细化了铜合金晶粒，钝化了晶界边缘，降低了样品的表面孔隙率。当 TiB _2的含量为 1%，不同油况（富油、无油和干摩擦）下的磨损率降低 42-95%。磨损率的急剧下降归因于具有抗磨性能的TiB _{2硬质颗粒增强了铜合金基体材料的微晶结构以及TiB 2}的高硬度和高耐磨性。使用扫描电子显微镜和能量色散光谱分析磨损轨迹，得出TiB ₂的添加提高了耐磨性的结论。