Abstract

The mechanical and structural stability of refractory high-entropy or medium-entropy alloys at high temperatures provides new directions for the development of high-performance self-lubricating materials. In this study, NbTiTa-Ag-BaF2/CaF2 self-lubricating composites were successfully prepared using powder metallurgy technology, and their friction and wear behaviors over a wide temperature range were investigated. The selflubricating composites exhibit low and stable COF values at the tested temperatures compared to NbTiTa alloy, with the average COF ranging from 0.29 to 0.44. Meanwhile, the presence of solid lubricants effectively reduces the wear rates of NbTiTa alloy at RT, 400 degrees C, and 800 degrees C, but the appearance of cracks and spall pits increases the wear at 600 degrees C.

Keywords Plus：ALLOYS，BEHAVIOR

Published in TRIBOLOGY INTERNATIONAL，Volume 197；10.1016/j.triboint.2024.109817，SEP 2024