SLIDING WEAR PROPERTIES OF TIAL ALLOYS WITH WITHOUT TIN COATINGS/

Dry sliding wear behavior of TiAl alloys, with and without TiN coating s, has been studied by using the block-on-ring wear test. The TiAl all oys were coated with TiN and a multilayer of TiN and TiCN using multi- are ion plating and plasma chemical vapor deposition, respectively. Th e results show that wear resistance of the TiAl has been enhanced with the presence of the coatings. It is interesting that the wear rate as a function of the normal load is quite different from general observa tions, i.e., the wear rate decreased with an increase in the normal lo ad. The properties of the alloy with and without the coatings have bee n related to microstructural features using X-ray diffraction and scan ning electron microscopy.