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Partial substitution of feldspar by BF slag in triaxial porcelain: Phase and microstructural evolution

IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata

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Title Partial substitution of feldspar by BF slag in triaxial porcelain: Phase and microstructural evolution
 
Creator Dana, Kausik
Das, S K
 
Subject Structural Clay Products
Whiteware
 
Description Feldspar was gradually substituted by B.F. slag (a glassy by-product of Indian steel plant) to the extent of 5-20 mass% in a triaxial porcelain composition consisting of 45 mass% kaolinitic clay, 30 mass% feldspar, 25 mass% quartz. The green compacts were heated at 1200degreesC for a period of 120 min. The microstructure and phase changes as they evolve on heating were studied using SEM and XRD techniques. The results reveal that quartz level was reduced from 26 to 9 mass% by the addition of 5% slag, while mullite level was reduced from 20 to 2 mass% by the addition of 10% slag. Beyond this, further addition of slag did not alter the quartz and mullite level much. Slag used in this study was enriched with alumina and contributed towards development of anorthite (CaO-Al2O3.2SiO(2)) phase by crystallization of melted glassy phase and its quantity increased with increase in slag content. Sudden increase in flexural strength of 20% slag containing body is attributed to stronger pre-stress caused by the difference in thermal expansion coefficient between glassy matrix, quartz and anorthite during cooling process. This also caused circumferential cracking around quartz grains. The paper further discusses the variation in their physico-mechanical characteristics with respect to slag content. (C) 2004 Elsevier Ltd. All rights reserved.
 
Publisher Elsevier, European Ceramic Society
 
Date 2004-12
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://cgcri.csircentral.net/481/1/J_European_Ceram_Soc_24_(2004)_3833%E2%80%933839.pdf
Dana, Kausik and Das, S K (2004) Partial substitution of feldspar by BF slag in triaxial porcelain: Phase and microstructural evolution. Journal of the European Ceramic Society, 24 (15-16). pp. 3833-3839. ISSN 0955-2219
 
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