Fabrication and evaluation of tribological properties of multiphase Mo-Si-B alloys

In this study, 76Mo-14Si-10B and 30Mo-47Si-23B (at.%) powder compounds were milled for 20 hours using an attritor ball mill with milling speed of 365rpm under inert gas atmosphere. After degasing of As-milled powders at 450℃ temperature for 2 hours, they were pressed into cylindrical samples with 25mm diameter and were sintered at 1100℃-1400℃ temperature range by tube resistance furnace under Ar gas atmosphere. Wear behavior of Mo-Si-B alloys were investigated using a pin-on-disk wear test machine. The results of waer tests under 20N and 30N forces showed that sintered 30Mo-47Si-23B alloy at 1300℃ temperature for 3 hours has more wear resistance than 76Mo-14Si-10B alloy because of MoSi2 and MoB intermetallic particles fine and uniform distribution.