eprintid: 1324
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/13/24
datestamp: 2023-11-09 15:49:29
lastmod: 2023-11-09 15:49:29
status_changed: 2023-11-09 15:39:29
type: article
metadata_visibility: show
creators_name: Roy, J.
creators_name: Bandyopadhyay, N.
creators_name: Das, S.
creators_name: Maitra, S.
title: Effect of CoO on the formation of mullite ceramics from Diphasic Al2O3-SiO2 Gel
ispublished: pub
keywords: Alumina; Aluminum hydroxide; Aluminum oxide; Cobalt compounds; Crystals; Fracture toughness; Mechanical properties; Microstructure; Morphology; Mullite; Powders; Silica; Silicate minerals; Sintering; Sol-gel process; Sol-gels; Sols; Spectroscopic analysis, Aluminium hydroxide; Colloidal interaction; Elevated temperature; Mullite ceramic; Mullite crystals; Mullite formation; Sintered compacts; Spectroscopic studies, Additives
note: cited By 14
abstract: In this work the effect of CoO additive on the formation of mullite from Al2O3-SiO2 diphasic gel has been studied. The diphasic gel precursor for mullite was synthesized by sol-gel route following aqueous phase colloidal interaction of aluminium hydroxide and silicic acid. The precursor gel powder was thoroughly characterized by chemical analysis, measurement of surface area, bulk density and also by FTIR spectroscopic studies. The gel powder was compacted with the CoO additives in different ratios and sintered at three different elevated temperatures. Microstructure of the sintered compacts was analyzed from SEM studies and phase analyses were carried out from XRD studies. It has been observed that the morphology of the mullite crystals changed significantly in the presence of the additives. As a result of the inclusion of additive maximum expansion in the b-axis of the mullite crystal took place. With the addition of 3 additive more than 14 mullite formation occurred after sintering. A significant improvement in the formation of mullite in the sintered masses was also observed in the presence of CoO additive. More than 10 improvement in density as well as flexural strength and about 5 improvement in fracture toughness of the sintered compacts were observed in the presence of the CoO additive. © 2010 Kavala Institute of Technology.
date: 2010
publisher: International Hellenic University - School of Science
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84863421544&doi=10.25103%2fjestr.031.23&partnerID=40&md5=93e8c03fd6ae14ff545646fa75ffbeda
id_number: 10.25103/jestr.031.23
full_text_status: none
publication: Journal of Engineering Science and Technology Review
volume: 3
number: 1
pagerange: 136-141
refereed: TRUE
issn: 17919320
citation:   Roy, J. and Bandyopadhyay, N. and Das, S. and Maitra, S.  (2010) Effect of CoO on the formation of mullite ceramics from Diphasic Al2O3-SiO2 Gel.  Journal of Engineering Science and Technology Review, 3 (1).  pp. 136-141.  ISSN 17919320