Tribological properties of Ni₃Al matrix composites with addition of silver and barium salt

Ni₃Al matrix composites with addition of silver and barium salt (BaCrO₄, BaMoO₄) were fabricated by powder metallurgy. It was found that from room temperature to 800 °C, Ni₃Al matrix composite with addition of Ag and BaCrO₄ offers the continuous lubrication properties, and its friction coefficient ranges from 0.29 to 0.38; Ni₃Al matrix composite with addition of Ag and BaMoO₄ also offers the favorable lubricating properties; the friction coefficient ranges from 0.28 to 0.35 in a wide temperature range. The low friction coefficient in a wide temperature range could be attributed to the synergistic effect of Ag and barium salts.