Dry sliding tribological properties and wear mechanisms of Mo–Si–B–xTi alloys at the temperature range of 25–1000 °C.

The search for Mo-Si-B based alloys exhibit excellent high-temperature wear resistance is highly demanding for their structural applications. For this target, the Mo-Si-B-xTi (x = 10, 20 and 30 wt%) alloys were fabricated and their dry sliding tribological properties at 25–1000 °C in air were systemically investigated. It indicates that the tribological properties of the MoSiBTi alloys are greatly determined by the test temperature and Ti content that correlates to oxidization process and oxidation products. Compared with other alloys, the Ti30 alloy shows an excellent wear resistance at 600–1000 °C due to the formation of dense tribo-oxides layer and improved oxidation resistance. Meantime, the friction coefficient at 800 °C is as low as 0.31 because of the formed self-lubricating tribolayer. • Dry sliding tribological properties at 25–1000 °C were systemically investigated. • Tribological behavior is greatly influenced by Ti content and test temperature. • Oxidization process and products determines the lubricating and wear mechanism. • COF of 0.26–0.31 can be obtained at 800 °C because of the excellent self-lubricity. • Ti30 alloy with 30 wt% Ti shows an excellent wear resistance at 600–1000 °C. [ABSTRACT FROM AUTHOR]