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| Influence of Hydrothermal Treatment and Urea Modification on the Microstructure of Gibbsite |
| WANG Jing1; XU Bing1; FU Gaofeng2 ; SHI Jun1 ; YUAN Qi2 |
1.Liaoning Key Laboratory for Fabrication and Application of Super-fine Inorganic Powers; Dalian Jiaotong University; Dalian 116028
2. School of Materials and Metallurgy; Northeastern University; Shenyang 110004 |
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Cite this article:
WANG Jing XU Bing FU Gaofeng SHI Jun YUAN Qi. Influence of Hydrothermal Treatment and Urea Modification on the Microstructure of Gibbsite. Chin J Mater Res, 2010, 24(1): 76-80.
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Abstract Gibbsite was modified by using urea as modifying agent via a hydrothermal method. Effects of the amount of urea and hydrothermal times on the microstructures were investigated. The results show that the slice-like boehmite microstructure can be obtained at 140 for 24 h when the molar ratio of urea to gibbsite is less than 6 : 1, while the global ammonium aluminum carbonate hydroxide (AACH) microstructure can be prepared at 140 for 24 h when the molar ratio was more than 8 : 1. The formation of AACH depends on the hydrothermal times. Aluminum hydroxide turned from gibbsite to the mixture of boehmite and AACH. Finally, AACH is synthesized. The morphology of aluminum hydroxide transformed from the block to the slice, and the global AACH trchitectures assembled by the lathes were obtained finally.
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Received: 30 April 2009
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| Fund: Supported by National Natural Science Foundation of China No.50974026, the Project of Liaoning Education
Department No.2008SD35, and the Science and Technology Program of Dalian City No.2008A13GX229. |
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