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-Al2O3 and the trends of necking-formation between particles. Therefore the dispersion of powder particles is improved significantly.
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Xiao, J., Deng, H., Wan, Y. et al. Preparation of ultrafine α-Al2O3 powders by catalytic sintering of ammonium aluminum carbonate hydroxide at low temperature. J Cent. South Univ. Technol. 13, 367–372 (2006). https://doi.org/10.1007/s11771-006-0050-4
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DOI: https://doi.org/10.1007/s11771-006-0050-4