The effects of double ceramic particles (B4C-SiC) on the performance, microstructure, and friction-wear mechanisms of copper-based PM

The copper-based powder metallurgy reinforced by double ceramic particles (B4C-SiC) were prepared by powder metallurgy route and the self-made carbon-ceramic composite was used as the friction disc. The effects of different proportions B4C-SiC on performance, microstructure, and friction-wear mechanisms were examined. The result reveals that the presence of SiC (less 3%) in B4C-SiC has great promotion effect on mechanical-properties, but small weakened effect on thermal-performance. The main factor affecting the friction-performance at low-speed is SiC, while is B4C at high-speed. With the ratio of SiC/B4C increases, the formation of B2O3-tribo-film experiences a change of first-decreased, then-increased, and finally-disappeared. While wear-mechanism experiences the transition stage from abrasive wear to slight fatigue wear, abrasive wear, severe fatigue wear, and adhesive wear, respectively.