【作者】 李冬云； 杨辉； 连加松；

【Author】 LIAN Jiasong, LI Dongyun, YANG Hui Zhejiang Ultrafine Powders & Chemicals Co., LTD., Yueqing, 325611 Center of Nanometer Science and Technology, Zhejiang University, Hangzhou, 310027

【机构】 浙江大学纳米科学与技术中心； 浙江超微细化工有限公司；

【摘要】 本文利用醇铝溶胶-凝胶法制备铝溶胶,经凝胶、干燥得到水合氧化铝,最后经热处理获得氧化铝粒子。采用XRD、TG／DTA和TEM等测试技术研究了醇铝的水解产物——水合氧化铝的特性及水合氧化铝的热处理过程, 探讨了热处理工艺对纳米氧化铝颗粒特性的影响规律。结果表明,醇铝的水解产物水合氧化铝为非晶态一水铝石,300℃煅烧后出现部分非晶态γ-Al2O3;煅烧温度、保温时间和冷却方式均能影响着纳米氧化铝粒子的晶型、大小和形貌,其中煅烧温度影响最大,冷却方式影响次之,保温时间影响最弱;在750℃／3h、800℃／4h、900℃／4h、 950℃／4h和1000℃／4h随炉冷却工艺条件下,分别得到粒径为3-5nm、5-10nm、10-15nm和50-100nm的纤维状或球状、α相或γ相的纳米氧化铝粒子。更多还原

【Abstract】 Al sol was prepared by sol-gel method using aluminium alkoxide as raw material. Nanometer Al2O3 powders were obtained after gelation, drying and heat treatment process. The characteristics and the thermal treatment process of hydrous alumina, the product of aluminium alkoxide hydrolysis were studied, the influence of thermal treatment process on the characteristics of nano-Al2O3 particles was analysized byXRD、 TG/DTA and TEM. The results showed that hydrous alumina was amorphous AlOOH, and partially converted into amorphous γ-Al2O3 after calcination at 300 ℃. The calcinations temperature, the holding time and the cooling mode have different effect on the crystal system, particle size and morphology of alumina. The influence of the calcinations temperature is the most powerful, the cooling mode is less significant compared with the former, the holding time has little influence on them. The size of 3·5nm, 3·5nm, 5·10nm, 10·15 nm or 50·100nm spheric or fibrillar α-or γ-Al2O3 can be obtained by the thermal treatment of 750℃/3h、 800℃/4h、 900℃/4h、 950℃/4h and 1000℃/4h , respectively.更多还原