提出了一种快速制备α-Al2O3微粉的方法, 以淀粉为碳源、γ-Al2O3为前体制备了C/γ-Al2O3复合物, 然后在800℃、氧气氛中焙烧制备α-Al2O3微粉. N2物理吸附及SEM分析结果表明, 所制得的α-氧化铝颗粒细小, 约为2μm. 该方法具有焙烧温度低、焙烧时间短的优点, 同时, 淀粉及γ-Al2O3均为廉价的工业原料, 且该方法所需淀粉量较少, 最少仅需0.3g/g γ-Al2O3, 对应的C/γ-Al2O3复合物碳含量约为6wt%, 因而极具工业化应用前景.
A new method for the preparation of fine α-Al2O3 powders was reported. C/γ-Al2O3 composites were prepared by carbonizing starch/γ-Al2O3 precursors. Calcining the composites under oxygen flow in a furnace at 800℃, rapid and total transformation of γ-Al2O3 to α-Al2O3 occurred when the carbon content was between 6wt%-13wt%. Characterized by N-2 adsorption technique and SEM observation, the particle size of the as-prepared α-Al2O3 powders is about 2μm. By this method, γ-Al2O3 can be transformed in very short time of about several minutes to α-Al2O3 at 800℃, which is much lower than the temperature for the commercial preparation. The method is very efficient for the rapid preparation of fine α-Al2O3 powders. And the simple operation and cheap raw materials for the method show that it is very promising for industrial applications.
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