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前驱体热解法制备高纯超细α-Al₂O₃粉体

PREPARATION OF HIGH PURITY AND ULTRAFINE α-Al₂O₃ POWDERS BY PYROLYSIS OF NH₄AlO（OH）HCO₃

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【Author】 Lin Yuanhua, Zhang Zhongtai, Huang Chuanyong, Tang Zilong, Chen Qingming (State Key Laboratory of New Ceramic and Fine Processing, Material Science and Engineer Department, Tsinghua University, Beijing 100084)

【机构】清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室!北京100084；清华大学材料科学与工程系新型陶瓷与精细工艺国家重点?；

【摘要】利用NH4Al(SO4) 2 和NH4HCO3 为原料 ,控制适当的反应物配比和反应体系的 pH值 ,制得NH4AlO(OH)HCO3 前驱体化合物 .在一定的温度下热解 ,最终制得活性超细α -Al2 O3 粉体 ,TEM测得粉体粒径约 5～ 2 0nm .ICP分析结果表明 :该粉体的Al2 O3 含量高达99.98% .更多还原

【Abstract】 NH 4AlO(OH)HCO 3 precursor was synthesized by using NH 4Al(SO 4) 2 and NH 4HCO 3 as the starting materials; suitable ratios of reactants and pH value of the reaction system. Active high purity(99.98%)and ultrafine Al 2O 3 powders can be prepared by calcining the precursor at 1 050 ℃ for 1.5 h. The particle size is about 5～20 nm as observed by the transmission electron microscopy.更多还原