Study on Combustion Synthesis and Densification Process for Titanium Diboride and Iron Layered Materials

Abstract

The combustion synthesis and densification process for titanium diboride and iron layered materials in the process of Self-propagating high-temperature synthesis of titanium diboride, variation of the initial temperature, amount of diluent and particle size of raw materials had effect on the adiabatic temperature, fraction of melted product and propagation rate of the combustion process, were studied by theoretical calculation and experimental analysis. The result showed that divided by a combustion temperature 3050K, either in the high temperature range or in the low temperature range, the calculated process activation energies were 140 KJ/mol or 355 KJ/mol respectively, which revealed two different reaction process mechanisms. Interfacial bonding between TiB2+Fe cermet and Fe substrate was analyzed by EPMA, which showed interfacial bonding of two-layered product was obtained by the dissolution and the diffusion of Ti in the Fe substrate and joining of Fe binder with Fe substrate. The fractures of joints took place in the TiB2+Fe cermet layer rather than at the interface.