Chatterjee, Minati and Naskar, Milan Kanti and Chakrabarty, P K and Ganguli, Dibyendu (2002) Sol-gel alumina fibre mats for high-temperature applications. Materials Letters, 57 (1). pp. 87-93. ISSN 0167-577X

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Abstract

Polycrystalline, high-alumina fibre mats (with 4 wt.% SiO2), for application as high-temperature thermal insulation materials having a web-like structure, were fabricated in situ by a single-step sol-gel spinning technique using a multi-orifice spinneret. Strong and resilient fibres with diameters in the range 3-10 mum were obtained from spinnable alumina-silica sols devoid of organics as the binder aid. Incorporation of 4 wt.% SiO2 as an additive increased the stability of the metastable transition alumina phases, which helped to increase the strength of the fibre mats. The mats exhibited a small linear shrinkage of about 2.75% at 1600 degreesC. Disintegration of the mats was also found to be negligible (about 2.25 wt.%) at 1600 degreesC. The health hazard involved with airborne fibres was drastically minimised in the developed fibre mats by applying sol-gel coatings on their surfaces and subsequent calcination at 1200 degreesC. The oxide-coated fibres exhibited coherent coatings by anchoring loose surface fibres in a network of alumina. (C) 2002 Published by Elsevier Science B.V.

Item Type:	Article
Uncontrolled Keywords:	Sol-gel process; High alumina fibres; Fibre mats
Subjects:	Engineering Materials
Divisions:	Sol Gel
Depositing User:	Bidhan Chaudhuri
Date Deposited:	22 Mar 2012 12:31
Last Modified:	04 Mar 2013 11:14
URI:	http://cgcri.csircentral.net/id/eprint/1325

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