NiAl Matrix Self-Lubricating Composite at a Wide Temperature Range

Abstract

Self-lubricating composite NiAl–Cr–Mo–CaF2–Ag was fabricated by powder metallurgy technique. The NiAl matrix composite with 10 wt.% Ag provides self-lubricating properties at a broad temperature range between room temperature and 1000 °C. Especially at 800 °C, the composite offers excellent friction reduction about 0.2 and wear resistance about 0.7 × 10−4 mm3 N−1 m−1. The lubricous behavior at a wide temperature range could be attributed to the synergistic effect of Ag, CaF2, CaCrO4, and CaMoO4.