Abstract
Nanolaminate Ti3SiC2-based material is prepared by self-propagating high-temperature synthesis (SHS) from elements, and the processes of its phase and structure formation is investigated. The Ti3SiC2 content in combustion products grows with an increase in the lifetime of the melt. The stratification observed at the level of the crystal structure results in the pronounced nanolaminate structure of Ti3SiC2 grains. The formation of the Ti3SiC2 phase occurs behind the combustion front with the interaction of stoichiometric TiC with the melt based on Ti-Si. Quantum-chemical calculations show that the formation of Ti-Si bonds is energetically preferable to Ti-C bond formation. A comparison of TiC and Ti3SiC2 crystal structures allow the assumption to be made that the laminate shape of Ti3SiC2 crystals is caused by the accumulation of structure discrepancies and hence by a lack of conjugation between the crystals.
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