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Preparation of ultrafine α-Al_2O_3 powders by catalytic sintering of ammonium aluminum carbonate hydroxide at low temperature 被引量:2

Preparation of ultrafine α-Al_2O_3 powders by catalytic sintering of ammonium aluminum carbonate hydroxide at low temperature
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摘要 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. 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-Al2 O3 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-Al2 O3 seeds and the mixture of α-Al2 O3 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.
出处 《Journal of Central South University of Technology》 2006年第4期367-372,共6页 中南工业大学学报(英文版)
关键词 ammonium aluminum carbonate hydroxide phase transformation temperature Α-AL2O3 agglomerα- tion α-Al2O3 相变温度 催化烧结 粉末冶金
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  • 1Chang -Seob Oh,G. Tomandl,Moon -Hwan Lee,Sung -Churl Choi.The effect of an added seed on the phase transformation and the powder properties in the fabrication of Al2O3 powder by the sol-gel process[J].Journal of Materials Science.1996(20)
  • 2S. Rajendran.Production of ultrafine alpha alumina powders and fabrication of fine grained strong ceramics[J].Journal of Materials Science.1994(21)

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