Mandal, S and Chakrabarti, S and Das, S and Ghatak, S (2004) Sintering characteristics of in situ formed low expansion ceramics from a powder precursor in the form of hydroxy hydrogel. CERAMICS INTERNATIONAL, 30 (8). pp. 2147-2155. ISSN 0272-8842

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Lithium alummosilicate powder precursors of compositions Li2O:Al2O3:SiO2 as 1: 1:2; 1: 1:2.5 and 1: 1:3 were prepared in the hydroxy hydrogel form by wet interaction technique in aqueous medium followed by sintering for ultimate synthesis of low expansion ceramics. Phases formed in the sintered specimens were analyzed by XRD technique. Thermal expansion of the specimens sintered at 1100, 1200 and 1300 degreesC were also measured. It was found that beta-spodumene, lithium aluminum oxide and silica were the predominat phases in all the specimens. Sintering was optimum up to 1200 degreesC beyond which no further noticeable shrinkage was observed. The sintered specimens remained highly porous even after firing at 1300 degreesC, whose bulk density and apparent porosity were in the range of 1.25-1.42 g/cm(3) and 43-48%, respectively. Thermal expansion characteristics and density of the sintered specimens were found to be primarily related to the composition of the phases formed during sintering. A porous low expansion ceramic monolith could be prepared using the present technique. (C) 2004 Elsevier Ltd and Techna S.r.l. All rights reserved.

Item Type: Article
Uncontrolled Keywords: sintering; low expansion ceramics; beta-spodumene; hydroxy hydrogel process
Subjects: Engineering Materials
Depositing User: Subhra Lahiri
Date Deposited: 30 Jan 2012 09:58
Last Modified: 30 Jan 2012 09:58

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