Reaction Parameters on the Reactivity in the Preparation of B4C by SHS

The preparation of B4C by SHS in B2O3-Mg-C system was investigated in this study. In the preparation of B4C, the effect on reactivity and reaction products of the initial pressure of inert gas in reactor, the content of Mg and C in mixture was investigated. The minimum initial pressure of inert gas in reactor for SHS reaction in this system was 25 atm, and as the pressure increased, the concentration of unreacted Mg decreased and combustion temperature increased. At the initial inert gas pressure in reactor of 25 atm, the optimum composition for the preparation of pure B4C was 2B(2)O(3) + 6.3Mg + 0.94C. The B4C synthesized in this condition had an irregular shape and the particle size of 1 similar to 3 gm.