Disperse Equiaxed -Al2O3 Nanoparticles Without Vermicular Microstructure

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• 作者：Wenbin Cao ; Ruiyun Guo ; Sanxu Pu ; Wei Zhang ; Lu Li ; Qian Guo and Jiangong Li
• 刊名：Journal of the American Ceramic Society
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：99
• 期：6
• 页码：1911-1916
• 全文大小：1331K
• ISSN：1551-2916

文摘

Nanocrystalline microstructure is regarded as a strategic approach to overcome the brittleness of alumina ceramics, and the preparation of disperse equiaxed α-Al₂O₃ nanoparticles is an essential step for the preparation of nanocrystalline alumina ceramics. In this work, disperse equiaxed α-Al₂O₃ nanoparticles were prepared using α-Fe₂O₃ as seed and isolation phase. At first, the composite of α-Al₂O₃ nanoparticles embedded in α-Fe₂O₃ matrix was obtained by calcining the precursor powder containing γ-AlOOH and Fe(OH)₃ (Fe³⁺/Al³⁺ mole ratio of 5) at 770°C for 2 h. Then disperse equiaxed α-Al₂O₃ nanoparticles with a mean size of 12 nm and a size distribution from 2 to 40 nm without vermicular microstructure were obtained by removal of α-Fe₂O₃ and other impurities in the composite through acid corrosion.