초록
알콕사이드를 원료로 하고 용매로는 에탄올과 증류수를 사용하여 cordierite 분말을 제조하였다. 촉매로는 HCl을 사용하였다. 촉매의 양은 HCl/TEOS 몰비를 0.1, 0.3, 0.5mol/mol비로 각각 반응시켜 촉매의 양에 따른 합성된 분말의 특성을 조사하였다. 0.1 mol/mol비로 제조된 분말의 $\alpha$-cordierite의 결정화 온도가 $1050^{\circ}C$인 반면 0.3 및 0.5mol/mol비로 제조된 분말의 $\alpha$-cordierite 결정화 온도는 $950^{\circ}C$였다. 또한 0.1mol/mol비로 제조된 분말의 경우에서는 $MgAl_{2}O_{4}$상이 $1300^{\circ}C$까지 존재하였다. 그러나 0.3 및 0.5mol/mol비로 제조된 분말의 경우에서는 $1300^{\circ}C$에서 $\alpha$-cordierite상만이 존재하였다.
Cordierite powders were prepared by a controlled hydrolysis of metal alkoxides with ethanol and distilled water. HC1 was used as a catalyst. The amount of HCI catalyst used was in range of 0.1-0. 5mol per lmol of TEOS. Effects of HC1 catalyst on the characteristics of cordierite powder were examined. $\alpha$-Cordierite powder prepared with HCI/TEOS mol ratio of O.lmol/mol was crystallized at $1050^{\circ}C$. On the other hand, $\alpha$-cordierite powders prepared with HCI/TEOS rnol ratio of 0.3 and 0.5rnol/mol were crystallized at $950^{\circ}C$. Spinel( mA120a) phase remained up to $1300^{\circ}C$ in the cordierite powder prepared with HCI/TEOS rnol ratio of 0.lrnolirnol. On the contrary, spinel phase was absent, and mordierite was the only phase remalned at $1300^{\circ}C$ in the cordierite powder prepared with HCI/TEOS mol ratio of 0.3 and O:5mol/mol.
