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水热处理和尿素改性对三水铝石微观结构的影响
引用本文:王晶,徐冰,付高峰,时军,袁琦. 水热处理和尿素改性对三水铝石微观结构的影响[J]. 材料研究学报, 2010, 24(1): 76-80
作者姓名:王晶  徐冰  付高峰  时军  袁琦
作者单位:大连交通大学无机超细粉体制备及应用辽宁省重点实验室,大连,116028;东北大学材料与冶金学院,沈阳,110004
基金项目:国家自然科学基金50974026、辽宁省教育厅计划2008S035和大连市科技计划2008A13GX229资助项目。
摘    要:以尿素为改性剂,用水热处理方法对三水铝石进行了改性处理。结果表明,尿素的加入量和水热处理时间对产物微观结构有显著的影响,当尿素与三水铝石的摩尔比小于6∶1时,水热处理24 h的产物为片状薄水铝石;当摩尔比超过8∶1时,产物为板条组装的球形碱式碳酸铝铵.纯相碱式碳酸铝铵的形成与水热处理的时间有关,随处理时间的延长,氢氧化铝经历了由三水铝石到薄水铝石与碱式碳酸铝铵混相结构再到纯相碱式碳酸铝铵的演变过程,期间发生由块体到片状再到片组装块体的微观形貌变化,最后演变为板条组装球形结构。

关 键 词:无机非金属材料  微观结构  水热  三水铝石  碱式碳酸铝铵
收稿时间:2009-04-30
修稿时间:2009-10-09

Influence of Hydrothermal Treatment and Urea Modification on the Microstructure of Gibbsite
WANG Jing XU Bing FU Gaofeng SHI Jun YUAN Qi .Liaoning Key Laboratory for Fabrication , Application of Super-fine Inorganic Powers,Dalian Jiaotong University,Dalian .School of Materials , Metallurgy,Northeastern University,Shenyang. Influence of Hydrothermal Treatment and Urea Modification on the Microstructure of Gibbsite[J]. Chinese Journal of Materials Research, 2010, 24(1): 76-80
Authors:WANG Jing XU Bing FU Gaofeng SHI Jun YUAN Qi .Liaoning Key Laboratory for Fabrication    Application of Super-fine Inorganic Powers  Dalian Jiaotong University  Dalian .School of Materials    Metallurgy  Northeastern University  Shenyang
Affiliation:1.Liaoning Key Laboratory for Fabrication and Application of Super-fine Inorganic Powers; Dalian Jiaotong University; Dalian 1160282. School of Materials and Metallurgy; Northeastern University; Shenyang 110004
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.
Keywords:inorganic non-metallic materials     microstructure  hydrothermal  gibbsite  ammonium aluminum carbonate hydroxide
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