Comparative Studies on Wear Behaviour of Sintered 316L Stainless Steels Loaded with h-BN and MoS_2

摘要

Mechanical properties and wear behavior of stainless steel embedded with different solid lubricants were investigated. Hexagonal boron nitride (h-BN) and molybdenum disulfide (MoS_2)- embedded 316L stainless steels (SS316L/h-BN and SS316L/MoS_2) were prepared by powder metallurgy method. Various h-BN and MoS_2 contents (10, 15 and 20 vol%) were mixed with 316L stainless steel powders and then sintered at 1200°C in H_2 atmosphere for 60 min. The experimental results showed that small boride phase and h-BN powder occupied the pores in the microstructure of SS316L/h-BN composite whereas the MoS_2 second phase occupied the pores of the sintered 316L matrix in the microstructure of SS316L/MoS_2 composite. The addition of h-BN decreased the sintered density and hardness whereas that of MoS_2 gave the opposite effect. Dry sliding wear behavior of composites was investigated by using pin-on-disc test rig at the sliding speeds of 0.1 and 0.2 m/s and the applied load of 3 N. The results showed that the MoS_2 composites had higher wear resistance than the h-BN composite but the h-BN composite yielded a better friction reduction.