期刊
POWDER TECHNOLOGY
卷 192, 期 1, 页码 40-46出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.powtec.2008.11.008
关键词
Aluminum hydroxide; Chemical precipitation; Microstructure; Phase transformation; alpha-Alumina formation
资金
- International S&T Cooperation Program (ISCP) [2008DFA50340]
- Specialized Research Foundation for the Doctoral Programs [20070730022]
- MOE, China,
- National Natural Science Foundation of China
The effects of pH value on the composition, structure, morphology, and phase transformation of aluminum hydroxides prepared by chemical precipitation were studied. Aluminum hydroxide precipitated at the pH values of 5 and 6 is amorphous and transforms to alpha-Al2O3 at 950 C via the amorphous aluminum hydroxide amorphous Al2O3 -> alpha-Al2O3 transformation path. Aluminum hydroxide precipitated at pH =7 is boehmite and transforms to alpha-Al2O3 at 950 C via the gamma-AlOOH -> gamma-Al2O3 -> alpha-Al2O3 path. Aluminum hydroxide precipitated at pH values in the 8 to 11 range is bayerite and transforms to alpha-Al2O3 at 1000 C via the alpha-Al(OH)(3) -> gamma-Al2O3 -> epsilon-Al2O3+theta-Al2O3 -> alpha-Al2O3 path. Moreover, the pH value affects not only the morphology of aluminum hydroxide particles which changes from ultrafine floccules through 50 nm blowballs then to 150 nm irregular agglomerates with increasing pH value but also the microstructures of final decomposition products of aluminum hydroxides. (c) 2008 Elsevier B.V. All rights reserved.
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