Maity, Anwesha and Kalita, Dipul and Kayal, Nijhuma and Goswami, Tridip and Chakrabarti, Omprakash and Rao, Paruchuri Gangadhar (2012) Oxidation behavior of SiC ceramics synthesized from processed cellulosic bio-precursor. Ceramics International, 38 (6). pp. 4701-4706. ISSN 0272-8842

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Abstract

Oxidation behavior of Si/SiC ceramic composite synthesized from processed cellulosic bio-precursor was studied in dry air over the temperature range 1200-1350 degrees C. The material was synthesized from processed bio-precursors (bleached bamboo kraft pulp in the form of flat board of bulk density 0.58 g cm(-3)) and had a bulk density of 2.66 g cm(-3), porosity of 0.6 vol% and contents of Si and SiC phases of 39.1% and 60.3% (v/v) respectively. The process of oxidation could be described closely by a parabolic oxidation equation. An activation energy of 141.4 kJ/mol was obtained. Both the SiC and Si phases oxidized and the oxidation was mainly controlled by the transport of molecular oxygen through the growing oxide layer. Pre-oxidation at 1300 degrees C for 24 h in ambient air increased the strength of Si/SiC ceramics by around 46% because of the healing of the surface defects created during surface preparation by the oxide layer. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Mechanical property; Processed bio-precursor; SiC ceramic; Oxidation behavior
Subjects:	Engineering Materials
Divisions:	Non-Oxide Ceramics & Composites
Depositing User:	Bidhan Chaudhuri
Date Deposited:	26 Jul 2012 10:01
Last Modified:	26 Jul 2012 10:01
URI:	http://cgcri.csircentral.net/id/eprint/1656

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