Initial sintering kinetics of titanium–titanium nitride nano/nanocomposite powders

Abstract

The present investigation deals with the mass transport mechanisms operating during the initial sintering of titanium–titanium nitride nano/nanocomposite powders. Two compositions of the nano/nanocomposite powders, i.e. nano Ti–8 wt-% nano TiN and nano Ti–15 wt-% nano TiN along with nano Ti were used in the present study. Sintering studies have been carried out by dilatometry of the powder compacts using a constant rate of heating (CRH) and employing model equations to the initial sintering portion. The shrinkage values obtained were analysed using Young and Cutlers equations and a model proposed by Johnson and Berrin. Based on the analysis of experimental data the effect of second phase TiN on the mass transport mechanisms of nano Ti was determined.

Keywords

NANO/NANOCOMPOSITES SINTERING KINETICS ACTIVATION ENERGY VOLUME DIFFUSION GRAIN BOUNDARY DIFFUSION

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