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Hydrolysis of aluminium metal, synthesis of nano alumina and sol-gel processing of monoliths

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Title Hydrolysis of aluminium metal, synthesis of nano alumina and sol-gel processing of monoliths
 
Creator THIRUCHITRAMBALAM, M
PALKAR, VR
 
Subject sintering behavior
boehmite sol
powders
composites
alumina
boehmite
ceramics
nano materials
sol-gel preparation
monoliths
 
Description High purity alumina is usually prepared using various intermediate aluminium compounds such as aluminium nitrate, aluminium alkoxides etc., as precursors. In fact the above mentioned intermediate aluminium compounds themselves are produced from aluminium metal. The present investigation is concerned with examining the feasibility of using aluminium hydroxides prepared by hydrolyzing aluminium metal, for sol gel processing. The study assumes added significance in view of the claims of Alcoa that it is possible to produce high purity aluminium metal in large quantities economically. During the present investigation sols were prepared by using various hydroxides, ie., bayerite, gibbsite and boehmite. Sol gel transition was observed only in the case of boehmite sol and this was gelated by either forced gelation method to prepare powder or controlled gelation method to prepare monoliths. Transparent Xerogels (boehmite) could be prepared by controlled gelation method but the presence of a thin layer of bayerite often resulted in translucency. Crack free monoliths could be prepared by heating the xerogels at a low heating rate(< 1 degrees C/min). It was found that sol gel processed boehmite transformed to alpha alumina at a relatively lower temperature (similar to 1080 degrees C ) than the as prepared boehmite which transformed at about 1200 degrees C.
 
Publisher MATERIALS RESEARCH SOCIETY
 
Date 2011-10-23T10:55:17Z
2011-12-15T09:11:07Z
2011-10-23T10:55:17Z
2011-12-15T09:11:07Z
2005
 
Type Proceedings Paper
 
Identifier Solid-State Chemistry of Inorganic Materials V,848,43-53
1-55899-796-2
0272-9172
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15108
http://hdl.handle.net/100/1861
 
Source Symposium on Solid-State Chemistry of Inorganic Materials V held at the 2004 MRS Fall Meeting,Boston, MA,NOV 29-DEC 02, 2004
 
Language English