Preparation and Tribological Behavior of Ti2AlNb/Ag Self-Lubricating Composites

摘要

In this paper, Ti2AlNb-based composites with different concentrations of Ag were fabricated by ball milling and spark plasma sintering (SPS). Microstructural evolution and phase compositions of the composites were further analyzed. The MS-T3001 friction wear tester was used to evaluate the friction performance of the Ag/Ti2AlNb self-lubricating composites. Results showed that the composites exhibit better anti-friction and anti-wear performance comparing with pure Ti2AlNb alloy. As the Ag wt.% increased, the coefficient of friction (COF) and wear rate of the composites were all decreased. Compared with pure Ti2AlNb, the COF and wear rate of Ti2AlNb-15 wt.%Ag self-lubricating composites at room temperature were decreased approximately 42 and 46%, respectively. The self-lubricating mechanisms of the composites were further discussed, and the silver-rich friction film formed on the friction surface under compression stress was regarded as the main anti-friction and anti-wear factors.