在氧气中焙烧C/γ-Al2O3复合物快速制备α-Al2O3微粉  

Preparation of Fineα-Al_2O_3 Powders by Calcining Carbon-coveredγ-Al_2O_3 in Oxygen

作　　者：王培[1] 林莉[1] 朱月香[1] 谢有畅[1] 

机构地区：[1]北京分子科学国家实验室,分子动态与稳态结构国家重点实验室,北京大学化学与分子工程学院

出　　处：《无机材料学报》2008年第5期996-1000,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(20773004);国家重点基础研究发展计划(G2006CB806102)

摘　　要：提出了一种快速制备α-Al_2O_3微粉的方法,以淀粉为碳源、γ-Al_2O_3为前体制备了C/γ-Al_2O_3复合物,然后在800℃、氧气氛中焙烧制备α-Al_2O_3微粉.N_2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-Al_2O_3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/gγ-Al_2O_3,对应的C/γ-Al_2O_3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 a-A1203 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 N2 adsorption technique and SEM observation, the particle size of the as-prepared α-Al2O3 powders is about 2um. 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.

关 键 词：超细α-Al2O3粉 淀粉 C/γ-Ak2O3复合 

分 类 号：TB35[一般工业技术—材料科学与工程]