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.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
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)
