Effect of mixed rare earth fluorides on the mechanical and tribological characteristics of Ni-based alloy

In this paper Ni-based alloys with different addition amounts of mixed rare earth fluoride were prepared using a P/M method in an intermediate frequen cy inductive furnace. The effect of mixed rare earth fluoride (30.9 wt.% La F3 and 69.1 wt.% DyF3 in composition) additions on the mechanical strength of the alloy was investigated and compared with that of a CeF3 addition. Th e findings indicated that by adding 3 wt.% mixed rare earth fluorides the i mproved toughness can be obtained. By adding 3 wt.% and 5 wt.% of mixed rar e earth fluorides the compressive strength at 700 degrees C were increased. The friction and wear behavior of the composite sliding against a high tem perature self-lubricating composite at room temperature and 600 degrees C i n air were investigated on a pin-on-disk tribometer. The composites showed better tribological performances at 600 degrees C than at room temperature.