自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 13    No. 4    August 2006

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Preparation of ultrafineα- Al2O3 powders by catalytic sintering of
ammonium aluminum carbonate hydroxide at low temperature
XIAO Jin(肖 劲), DENG Hua(邓 华), WAN Ye(万 烨), LI Jie(李 劼),
 LIU Ye-xiang(刘业翔)

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:The precursor of ammonium aluminum carbonate hydroxide was synthesized by using aluminum sulfate (Al2(SO4)3) and ammonium carbonate((NH4)2CO3). The effects of  α- Al2O3 seeds and mixture composed of α- Al2O3 and ammonium nitrate, as well as multiplex catalysts (AT) on phase transformation of alumina in sintering process were investigated respectively. The results show that the α- Al2O3 seeds and the mixture of α- Al2O3 and ammonium nitrate can lower the phase transformation temperature of α- Al2O3 to different extents while the particles obtained agglomerate heavily. AT has great potential synergistic effects on the phase transformation of alumina and reduces the phase transformation temperature of α- Al2O3and the trends of necking-formation between particles. Therefore the dispersion of powder particles is improved significantly.

 

Key words: ammonium aluminum carbonate hydroxide;     phase   transformation temperature;α-Al2O3; agglomeration

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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