Sinhamahapatra, Somnath and Dana, Kausik and Ghosh, Arup and Reddy, Vakiti Pradeep and Tripathi, Himansu Sekhar (2015) Dynamic thermal study to rationalise the role of titania in reaction sintering of magnesia-alumina system. Ceramics International, 41 (1, B). pp. 1073-1078. ISSN 0272-8842

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Magnesia-rich sintered spinel (66% Al2O3 & 34% MgO) was prepared in the temperature range of 1600-1700 degrees C by reaction sintering of caustic magnesia and calcined alumina with and without TiO2 additive in N-2 atmosphere. Sintered products were characterised in terms of densification, phase assemblage, and microstructure. The role of TiO2 on spinelisation and densification was analysed using both dynamic and static heating regime. Although a static firing at 1700 degrees C with 2 h dwelling results in similar densification of spinel in presence and absence of titania, the specific role of titania was discerned only by critically analysing the dimensional change in dynamic heating regime. It was revealed that titania significantly increases only the densification rate of magnesia-alumina system with marginal effect on spinelisation. Better densification of titania-containing spinel, even at a relatively lower temperature, can be attributed to the incorporation of titania into the spinel structure and formation of magnesium aluminium titanate phase. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Item Type: Article
Subjects: Refractories
Divisions: Refractory
Depositing User: Bidhan Chaudhuri
Date Deposited: 08 Jan 2016 09:02
Last Modified: 08 Jan 2016 09:02

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