Image icon  Alumina-zirconia-silica (AZS) refractory brick

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Description: On cooling the ceramic liquid precipitates primary ZrO2 dendrites (white), grey corundum (Al2O3) and a ZrO2/Al2O3 eutectic while glass solidifies from the remaining liquid (slightly darker than the corundum). The composition of this glass is carefully controlled so that it is fluid enough to accommodate the tetragonal to monoclinic ZrO2 transition n heating the glass tank to use temperature. The AZS microstructure is carefully designed so that the alumina dissolves in the tank glass (soda-lime-silica, SLS) leaving a viscous alumina rich layer which protects the refractory. It can survive 12 years continuous use in direct contact with fluid, corrosive SLS liquid at temperatures up to 1500 °C.
Keywords: alumina • aluminium • brick • ceramic • dendrite • eutectic • glass • oxygen • silica • silicon • zirconia • zirconium
Categories: Science approaches > Microstructure
Materials > Ceramics & glasses
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: Prof W E Lee, Department of Engineering Materials, University of Sheffield
DoITPoMS, University of Cambridge
Published by: DoITPoMS, University of Cambridge
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Date created: 10 May 2002
Date added: 21 August 2009
Resource ID: 1188