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

• Published in: Tribology international 2022-11, Vol.175, p.107865, Article 107865
• Main Authors: Wu, Jiaqi, Li, Zhuan, Luo, Yong, Li, Ye, Gao, Zonglong, Zhao, Yibo, Wu, Cuiwei, Liao, Yanxia, Jin, Min
• Format: Article
• Language: English
• Subjects: B2O3 tribo-film; Copper-based PM; Double ceramic particles (B4C-SiC); Wear mechanism
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2022.107865

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. •The friction behavior of B4C-SiC-Cu-based PM mated with C/C–SiC was investigated.•B4C-SiC has different effects on physical, thermal, and friction properties.•S3 copper-based PM (3%SiC-5%B4C) obtains more excellent performance.•The main factor affecting the friction properties at low speed is SiC, while is B4C at high speed.•The relationship between formation of B2O3 tribo-film and wear mechanism was explored.