高純度富鋁紅柱石粉末之製造

Synthesis of High Purity Mullite Powders

顏富士(Fu-Su Yen) ； 盧宏陽(Hong-Yang Lu) ； 許志雄(Chi-Shiung Hsi)

《鑛冶：中國鑛冶工程學會會刊》 31卷4期 (1987/12) Pp. 95-104

https://doi.org/10.30069/MM.198712_31(4).0010

摘要

高純度富鋁紅柱石粉末，可藉Al_2O_3－SIO_2系之溶膠－凝膠法在較低溫度下獲得。合成過程中，富鋁紅柱石的生成量多寡及結晶大小，與起始膠體的性質有重要的關係。由本研究結果顯示：在室溫下合成之似水鋁石（pseudoboehmite）膠體，其Al_2O_3含量在73〜74 wt％者，經1300℃O燒後可得富鋁紅柱石相含量＞ 93 wt％且粒徑為30 nm的超微粉末。

並列摘要

High purity mullite powders can be obtained under low temperature environment through the calcination of the sol-gel products of the Al_2O_3-SiO_2 system. The quantity and crystal size of mullite thus formed depend strongly on the crystal type and crystallinity of the Al_2O_3-SiO_2 xerogels. According to present study, the best conditions for the synthesis of mullite from sol-gel of Al_2O_3-SiO_2 system will be: 1. Al_2O_3 contents in the solution: 74~75 wt% 2. reaction temperature: 25°C 3. reaction pH: 8.8~9.5 4. calcination temperature (mullitization): 1300°C The mullite powder product can be made with purity ＞93 wt%, and particle size 30 nm.