Tribological Behaviors of NiAl-Ti₃SiC₂ Self-Lubricating Composites at Elevated Temperatures

Abstract

The tribological behaviors of NiAl-Ti₃SiC₂ composites (NMC) against Si₃N₄ at elevated temperatures were investigated by carrying out dry sliding wear tests at the condition of 10 N–0.2 m/s. The results showed that NMC without Ti₃SiC₂ had a high friction coefficient and wear rate at elevated temperatures, and the addition of Ti₃SiC₂ could improve the high-temperature tribological properties. Both the friction coefficient and wear rate of NMC obviously decreased at 600 and 800°C with the addition of Ti₃SiC₂. The excellent tribological behaviors of NMC with 5 wt% Ti₃SiC₂ at elevated temperatures implied that 5 wt% Ti₃SiC₂ could be the optimal content.

KEY WORDS:

• Solid Lubricants
• Self-Lubricating Composites
• Self-Lubrication Friction
• Solid Lubrication Wear
• Self-Lubrication

ACKNOWLEDGMENT

The authors wish to gratefully thank the Material Research and Testing Center of Wuhan University of Technology for their assistance.