Thermodynamic and Lattice Parameter Calculation of TiCx Produced from Fe-Ti-C Powders by Laser Igniting Self-propagating High-temperature Synthesis (LISHS)
Y.X. Li, P.K. Bai, B. Liu and J.H. Wang
TiCx has been formed by laser igniting self-propagating high-temperature synthesis (LISHS) of an intimate mixture of compacted powders of elemental C, Ti and Fe. The adiabatic combustion temperature and the lattice parameter of the synthesized TiCx were calculated. The results show the adiabatic combustion temperature and the lattice parameters of TiCx decrease with the increasing of Fe content when C/Ti atomic ratio is 1, whereas they increase with the increasing of C/Ti atomic ratio when Fe content is 40 wt.%. The reaction standard Gibbs free energy was calculated based on the thermodynamics theory. The results show that TiC phases are easier to form than Fe3C and Fe2Ti phases. Furthermore, when C/Ti atomic ratio is less than 1 in the starting materials, in addition to fine TiC particulates, Fe2Ti phase is found in the synthesized products.
Keywords: Self-propagating high-temperature synthesis (SHS); laser igniting self-propagating high-temperature synthesis (LISHS), lattice parameter; adiabatic combustion temperature; standard Gibbs free energy