Formation of Ni-Ti intermetallics during reactive sintering at 800-900 °C

In this work the formation of intermetallics in the Ni-Ti system by reactive sintering at 800-900 degrees C was studied. The mechanism and kinetics of the reactions, which led to Ni-Ti phases, were determined by thermal analysis, in-situ XRD and the application of an experimental model consisting of nickel-plated titanium. It was found that the formation of Ni-Ti phases below the transformation temperature of titanium is controlled by diffusion. Above this temperature, the reactions switch to the rapid Self-propagating High-temperature Synthesis (SHS) mode.