Influence of calcinations treatment in chemical solidification using mechanochemical approach

Abstract

The influence of calcination-mechanochemical treatment on the structure and crystallization behavior of alumina and mechanochemical treatment of silica were investigated. A surface of alumina powder was mechanochemically activated using a planetary ball-milling and calcinations. On the other hand, a surface of silica powder was mechanochemically activated only using a planetary ball-milling. It was found that the crystallinity and the crystallite size increased with the increase of calcinations temperature. The mixture of activated powders with 15 wt.% KOH aqueous solution were cast into a mold and keep at 25oC under relative humidity of 50% until solidification. The solidification time increased with increasing calcinations temperature. This behavior is due to the destruction, by calcinations temperature, of the large aggregates of prepared powders, of the grain growth, and the phase transition of alumina takes place during calcinations. This proposed process is an attractive route for the shaping materials into ceramics without sintering process.