Anil, Asha and Misra, S N and Misra, N M (2018) Studies on Thermal Reactions and Sintering Behaviour of Red Clays by Irreversible Dilatometry. In: 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC-2017), NOV 24-25, 2017, Bikaner, INDIA.

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Thermal behavior of clays strongly influences that of ceramic bodies made thereof and hence, its study is must for assessing its utility in ceramic products as well as to set the body composition. Irreversible dilatometry is an effective thermal analysis tool for evaluating thermal reactions as well as sintering behavior of clays or clay based ceramic bodies. In this study, irreversible dilatometry of four red clay samples (S, M, R and G) of Gujarat region, which vary in their chemical and mineralogical compositions was carried out using a Dilatometer and compared. Chemical analysis and XRD of red clays were carried out. XRD showed that major clay minerals in S, M and R clays are kaolinite. However, clay marked R and G showed presence of both kaolinite and illite and / muscovite. Presence of non-clay minerals such as hematite, quartz, anatase were also observed in all clays. XRD results were in agreement with chemical analyses results. Rational analyses showed variation in amount of clay and non-clay minerals in red clay samples. Evaluation of dilatometric curves showed that clay marked as S, M and R exhibit patterns typical for kaolinitic clays. Variation in linear expansion (up to 550 degrees C) and shrinkage (above 550 degrees C) between these three clays was found to be related to difference in amount of quartz and kaolinite respectively. However, dilatometric curve of G exhibit a pattern similar to that for an illitic clay. This study confirmed that sintering of investigated kaolinitic and illitic and / muscovitic red clays initiates at above 1060 degrees C and 860 degrees C respectively and this behaviour strongly depends upon type and amount of minerals and their chemical compositions.

Item Type: Conference or Workshop Item (Paper)
Additional Information: 2nd International Conference on Condensed Matter and Applied Physics (ICC), Bikaner, INDIA, NOV 24-25, 2017
Subjects: Structural Clay Products
Depositing User: Bidhan Chaudhuri
Date Deposited: 18 Sep 2018 07:11
Last Modified: 18 Sep 2018 07:11

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