Sinhamahapatra, S and Das, S K (2013) Some studies on dehydroxylation-rehydration phenomenon of kaolin of Indian origin. CFI-Ceramic Forum International , 90 (3). E29-E30,E32,E34. ISSN 0173-9913

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Abstract

Dehydroxylated kaolin has widespread application in the synthesis of mullite ceramics. In the present study, a new source of highly pure kaolin from western part of India was used as a raw material to investigate the dehydroxylation-rehydroxylation behavior utilizing DTA/TGA and FTIR technique. The results showed that kaolin used in this study possesses high degree of crystalinity and retained its structure up to some extent even after dehydroxylation at 700 degrees C with a tendency to rehydrate. The DTA peak at 1000 degrees C supports the high reactivity of dehydroxylated kaolin and the peak is associated with the formation of mullite. The SEM study does not reveal any major microstructural changes after dehydroxylation. However, the XRD pattern of raw clay shown kaolin as major phase which converted to amorphous nature after dehydroxylation and subsequent grinding.

Item Type:	Article
Subjects:	Structural Clay Products
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	27 Sep 2013 09:27
Last Modified:	27 Mar 2014 13:31
URI:	http://cgcri.csircentral.net/id/eprint/2181

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