Abstract
In order to obtain fine mullite powders by a simple and inexpensive process, alpha aluminum hydroxide (α-Al(OH) 3) was used as raw material, and heterogeneous nucleation-and-growth process was chosen for the preparation of powders. Composite coating particles consisting of α-Al(OH) 3 cores with outer amorphous silica shell were prepared by heterogeneous nucleation-and-growth process in the ethanol suspension containing ammonia, tetraethylorthosilicate (TEOS) and α-Al(OH) 3. Fine mullite powders (average particle size 0.67 μm) were fabricated by calcined composite coating particles at 1500 °C for 2 h.
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