Al-Si spinel phase formation in diphasic mullite gels
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Al-Si spinel phase formation in diphasic mullite gels
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| Creator |
Chakraborty, Akshoy Kumar
Das, Sukhen |
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| Subject |
Engineering Materials
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| Description |
Diphasic aluminosilicate gels of varying Al2O3:SiO2 ratios were synthesized out of TEOS and ANN in basic condition, heated to different temperatures and finally analyzed for phases. All gels precalcined to similar to 1000 degreesC were further calcined after mixing with CaCO3 and analyzed by XRD. XRD intensity of (440) of intermediate spinel phase formed during mullite formation was recorded. It has been shown that the XRD intensity of spinel phase to calcium fluoride is in excess of what is possible if the spinel phase is simply gamma-Al2O3. This substantiates the view of silicon-incorporation in spinel lattice. This view is verified and extended by the further study of phase development on heating spinel-generated samples with CaCO3. Gehlenite forms in Si-rich gels up to approximately 3:2 mullite composition whereas in more Al-rich gels additional calcium aluminate phases are formed. (C) 2002 Elsevier Science Ltd and Techna S.r.l. All rights reserved.
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| Publisher |
Elsevier
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| Date |
2003
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/830/1/akshoy'03.pdf
Chakraborty, Akshoy Kumar and Das, Sukhen (2003) Al-Si spinel phase formation in diphasic mullite gels. Ceramics International, 29 (1). pp. 27-33. ISSN 0272-8842 |
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| Relation |
http://cgcri.csircentral.net/830/
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