The critical furnace chamber temperature (T′ign) of the thermal explosion synthesis reaction Ti+3Al→TiAl3 is studied by isothermal and non-isothermal DSC. The reaction product is characterized by using the X-ray powder diffraction.
The value of T′ign is between 740 and 745C obtained from the isothermal DSC observations, and 729C obtained from non-isothermal DSC curves.
It shows that these two values have a good consistency. With the help of the apparent activation energy of the reaction obtained
by Friedman method and the value of T′ign0 by the multiple linear regression of the T′igns at different heating rates (β), the critical temperature (Tb) of thermal explosion for Ti–75at%Al mixture is estimated to be 785C.