Preparation of High-Purity Ultrafine α-Al2O3 by Solid-State Reaction at Room Temperature
Ammonium aluminium carbonate hydroxide (AACH),with a small quantity of T-AlOOH,was synthesized through solid-state reaction at room temperature using AlCl3·6H2O and NH4HCO3 as raw materials and polyethylene glycol (PEG-10000) as the dispersant.After calcined at 1100℃ for 1.5h,ct-Al2O3 powders with primary particle sizes of 20~30nm were obtained.The crystal phase,particle size and morphology of the high-purity ultrafine ct-Al2O3 were characterized.The results showed that a small quantity ofγ-AlOOH in the AACH decomposed and formed crystal seeds.The presence of crystal seeds reduced the nucleation activation energy and therefore reduced the phase transformation temperature.
Crystal seed Solid-state reaction Ultrafine Alumina powders
Hao Chengwei Wu Bolin Li Jiyan
Key Lab of Nonferrous Materials and New Processing Technology Ministry of Education of Guilin Univer Key Lab of Nonferrous Materials and New Processing Technology Ministry of Education of Guilin Univer
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
683-685
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）