Abstract
This paper describes phase formation and mass transport during the reaction of iodine-refined titanium with nitrogen at 760 Torr and 800 to 1200°C. Each titanium-nitrogen phase is present within the composition and temperature range of its thermodynamic stability. Between 882 and 1110°C there are the nitrides, TiN and Ti2N, and solutions of nitrogen in α and β-titanium. There is no β-titanium below 882°C or Ti2N above 1110°C. The growth of each phase layer involves some favorably oriented grains from among the many that are nucleated. Nitrogen concentration gradients exist in all phases. Nitrogen is the predominant diffusing species in all phases but a small amount of outward diffusion of titanium occurs through the nitrides, producing α-phase porosity above 1100°C. There is some porosity in the outer regions of TiN. All phases remain mechanically sound and coherent with each other. Changes in the relative proportions of phases during cooling are identified, which enables corrections to be made to kinetic data for the reaction.
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McDonald, N.R., Wallwork, G.R. The reaction of nitrogen with titanium between 800 and 1200°C. Oxid Met 2, 263–283 (1970). https://doi.org/10.1007/BF00614621
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DOI: https://doi.org/10.1007/BF00614621