NI-CR-TI PROTECTIVE COATING

Ni-Cr-Ti protective films were prepared by a plasma beam sputter depos ition process at 250-degrees-C. Ni-Cr-Ti thin films (50 nm) have been used to study the microstructure by transmission electron microscopy a nd the grain growth during heating in the heating stage of an electron microscope and after baking in an oxygen flow in an oven. Energy-disp ersive spectroscopy analysis in the transmission electron microscope w as used to study compositional variations in the films. Ni-Cr-Ti films 300 nm thick deposited on polished hot-worked tool steel (AISI H11) s ubstrates have been studied by Auger electron spectroscopy and depth p rofiling before and after heat treatment in oxygen in an oven at tempe ratures from 600 to 800-degrees-C. Basic microstructural, morphologica l, compositional and mechanical properties have been studied on Ni-Cr- Ti protective coatings 3 gm thick. Oxidation and electrochemical prope rties have also been studied.