Combustion Behavior of a Ti + TiC Mixture in a Nitrogen Coflow
B. S. Seplyarsky, A. G. Tarasov, R. A. Kochetkov, I. D. Kovalev
Institute of Structural Macrokinetics and Materials Science (ISMAN), Russian Academy of Sciences
Chernogolovka, 142432 Russia
Keywords: SHS, TiC + Ti mixtures, granulation
Abstract
Combustion of powder and granular mixtures of TiC + Ti in a quartz tube purged with nitrogen was studied. Mixtures based on fine and coarse-grained TiC were used. It is found that purging of a powder mixture of bulk density with fine titanium carbide with nitrogen coflow does not lead to the spread of the flame front, whereas granular mixtures burn at the same pressure difference. Mixtures based on coarse-grained titanium carbide powder burn in both powder and granular form. The burning rate of a granular mixture of TiC + Ti with coarse-grained titanium carbide is significantly higher than when using fine titanium carbide. It is shown that in the case of a coarse-grained TiC, granulation of the mixture of TiC + Ti significantly improves the degree of nitriding of the synthesis products compared to the powder mixture. During combustion of granular mixtures of TiC + Ti, in contrast to powder mixtures of the same composition, a single-phase product of approximate composition TiC0.5N0.44 is formed as a result of synthesis.
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