抄録
This study investigated shock-activated reaction synthesis of Ti3SiC2 and Ti2AlN, which are ceramics having relatively high stiffness and low hardness. Dynamically densified compacts of Ti, SiC, and graphite and Ti and AlN precursors were prepared using explosive loading techniques. Subsequent reaction behavior of the shock-densified, activated compacts was studied via heat treatments and differential thermal analysis performed at varying heating rates. In both systems, shock activation led to an accelerated rate of reaction at temperatures less than 1600 oC, and, above that temperature, it promoted the formation of almost 100% of the ternary compounds. A kinetics-based mathematical model based on mass and thermal transport was developed to predict the effect of shock activation and reaction synthesis conditions that ensure the formation of the ternary compounds. In this paper, results of the effects of shock activation on subsequent reaction synthesis will be presented along with correlation to the kinetics-based mathematical model.
