Analyses of Frictional Wear Mechanics of Ni-Cr/BN Self-Lubricating Composites

Abstract:

The nickel based self-lubricating materials containing different contents of BN were prepared by not-pressing technology of powder metallurgy. The morphologies of worn surfaces and the fracture were analyzed by scanning electron microscopy and metallurgical microscope. The influences of different hot-pressing temperature and contents of BN on mechanical and tribological properties of the material were studied. The results showed that increasing of hot-pressing temperature leaded to good mechanical properties and tribological properties of material as well as the decreasing of porosity. The Ni-Cr/10%BN had worse tribological properties compared with Ni-Cr/11%BN because decreasing of content of BN cannot form continuous lubricating film on the friction surface or the flaking lubricating film can not be supplied on time.