Effects of MoS2on mechanical and tribological
properties of NiCr-based alloys①
properties of NiCr-based alloys①
(1. College of Mechanical Engineering, China University of Mining and Technology,
Xuzhou 221008, P.R.China;
2. State Key Lab for Powder Metallurgy, Central South University of Technology,
Changsha 410083, P.R.China)
Xuzhou 221008, P.R.China;
2. State Key Lab for Powder Metallurgy, Central South University of Technology,
Changsha 410083, P.R.China)
Abstract: Ni-Cr based alloys with a wide temperature range self-lubrication were made by hot-pressing the mixture powder of alloyed Ni-Cr powder, elemental Mo, Al, Ti and B powders and MoS2powder. The mechanical and tribological properties of these alloys when rubbing with Al2O3ceramics and W18Cr4V high speed steel were measured in the temperature range of 20~700℃, and the mechanisms of self-lubrication and wear resistance were studied. The results showed that the alloy containing 10% MoS2has the best combination of mechanical properties, antifriction and wear resistance. Over a wide temperature range from 20℃to 700℃, when rubbing with Al2O3, its friction coefficient and wear rate are 0.19~0.3 and (1.1~1.5)10-14m3/(N·m), respectively; when rubbing with the high speed steel, those values are 0.18~0.26 and (0.6~3.2)×10-15m3/(N·m), respectively.
Key words: Ni-Cr based alloys; molybdenum disulfide; self-lubrication; tribological properties