Study on the adiabatic temperature of Al-Ti-C grain refiner synthesized by SHS technique

Abstract

Abstract-SHS technique and conventional melting and casting technology were combined and used for the preparation of AlTi-C grain refiner alloy. Experimental results show that when SHS reaction occurs to the Al, Ti and C powder reactant in Al melt and the composition proportion factor, n , is between 4 and 10, the effect of composition on the initial temperature of SHS reaction is small and its initial temperature ranges from 810 to 815℃. However, the highest temperature of the melt increases with increasing n values and increases gradually from 845 to 1370℃. In the meantime, when the composition proportion factor for Al, Ti and C powder reactant, n, is greater than 5.95, its adiabatic temperature T d ＞1800K which conforms to the empirical criterion proposed by Merzhanov et al. The SHS reaction of reactant can accomplish by selfmaintenance.