New data on the thermal analysis of diphasic mullite gel |
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| Authors: | A K Chakravortty |
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| Institution: | (1) Central Glass & Ceramic Research Institute, 700 032 Calcutta, India |
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| Abstract: | A diphasic mullite gel has been synthesized by using Ludox and Al(NO3)3-9H2O in ammoniacal solution. Both DTA and DDTA studies have been performed with a sensitive differential thermal analyzer system. Besides usual exotherm due to mullite formation, a pronounced exotherm between 800–1300°C has been noted. Considering previous XRD data, it is explained as due to formation of Si-Al spinel phase, which is subsequently transformed exothermally at  1320°C to mullite. |
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| Keywords: | diphasic mullite gel Si-Al spinel mullite |
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