摘要
为了获得更好的α-Al2O3纳米粉体,以硫酸铝铵和碳酸氢铵合成的碳酸铝铵为原料,经过不同的加热升温方式,研究了碳酸铝铵热分解过程中不同的Al2O3相转变历程。研究结果表明,通过提高低温段的升温速度来加快碳酸铝铵的热分解速率,会使各Al2O3相的转化速度明显增大,相转化温度明显降低,对α-Al2O3的生成产生有利的影响。最终在较碳酸铝铵常规热分解更低的温度、更短的保温时间,获得晶粒尺寸更小、分散性更好的单相α-Al2O3粉体。
In order to acquire finer α-Al2O3 nanopowder, the procedures of the transformation of Al2O3, via thermal decomposition of ammonium aluminum carbonate hydroxide VNH4AlO（OH）HCO3 or AACH] synthesized with ammonium aluminum sulfate V NH4Al（SO4）2] and ammonium hydro carbonate [NH4HCO3], were studied, h is demonstrated that, as the heating rate of the AACH is increased, the phases of formation temperatures of the different Al2O3 phases decrease. Finally, the finer α-Al2O3 nanopowder was obtained under the conditions of shorter heating time and lower temperatures compared with the method of conventional thermal decomposition.
出处
《青岛大学学报（工程技术版）》
CAS
2005年第4期19-23,共5页
Journal of Qingdao University(Engineering & Technology Edition)
关键词
碳酸铝铵
热分解
纳米粉体
Α-AL2O3
ammonium aluminum carbonate hydroxide（AACH）
thermal decomposition
nanopowder
α-Al2O3
