LIE 27.1-2, p. 31-41

LIE Home • Issue Contents

Thermodynamic and Lattice Parameter Calculation of TiC_x 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 TiC_x were calculated. The results show the adiabatic combustion temperature and the lattice parameters of TiC_x 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

Full Text (IP)