Preparation of ultrafine α- Al2O3 powders by catalytic sintering of ammonium aluminum carbonate hydroxide at low temperature①
来源期刊：中南大学学报(英文版)2006年第4期
论文作者：肖劲 邓华 万烨 李劼 刘业翔
文章页码：367 - 372
Key words：ammonium aluminum carbonate hydroxide; phase transformation temperature;α-Al2O3; agglomeration
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.
