Influence of Ti_3SiC_2 content on tribological properties of NiAl matrix self-lubricating composites

摘要

NiAl matrix self-lubricating composites (NMCs) with various contents of Ti_3SiC_2 were fabricated by in situ technique using spark plasma sintering. The effects of Ti_3SiC_2 content on tribological properties of NMC were investigated. The results showed that NMC were composed of the matrix phase of NiAl alloy, enhanced phase of TiC and lubricating phases of Ti_3SiC_2 and C. NMC with 10 wt.% Ti_3SiC_2 exhibited low friction coefficient of 0.60 and wear rate of 5.45 × 10~(-5) mm3 (N m)~(-1) at the condition of 10 N-0.234 m/s at room temperature. The optimum content of Ti_3SiC_2 was 10 wt.%. The excellent tribological performance of NMC could be attributed to the balance between strength and lubricity, as well as syn-ergetic effect of enhanced phase and lubricating phases. The wear mechanisms changed with the increasing of the doped content of Ti_3SiC_2.