遷移アルミナを用いたメカノケミカル反応によるスピネルおよびムライトの合成

概要

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Mechanochemical route for synthesis of spinel(MgAl_2O_4) and mullite(3Al_2O_3・2Si0_2)from several types of transition alumina were investigated. Spinel was mechanochemically synthesized without calcination，when the mixture of χ-Al_2O_3 and MgO was ground for 192 h with a planetary ball mill. When the other types of transition alumina，r，δ，θ and κ-alumina，were used as raw materials，no formation of spinel was observed only by mechanochemical process. By using the mixture ground for 24 hr，however，formation temperature of spinel decreased below 900 ℃. On the other hand，n o formation of mullite was observed in mechanochemical treatement by using the mixture of any type of transition aluminas and silica as a raw material. Calcination above 1000℃ caused the ground mixture to form mullite.