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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Reaction Heat Utilization in Aluminosilicate-Based Ceramics Synthesis and Sintering

M. Karhu1, J. Lagerbom1, P. Kivikytö-Reponen1, A. Ismailov2, E. Levänen2

1 VTT Technical Research Centre of Finland Ltd, Sinitaival 6, P.O. Box 1300, FI-33101 Tampere, Finland
2 Tampere University of Technology, Korkeakoulunkatu 10, P.O. Box 527, FI-33101 Tampere, Finland

received November 2, 2016, received in revised form December 16, 2016, accepted January 19, 2017

Vol. 8, No. 1, Pages 101-112   DOI: 10.4416/JCST2016-00094

Abstract

Self-propagating high-temperature synthesis (SHS) is a widely known and extensively studied highly exothermic-reaction-utilizing technique for making certain advanced composites and intermetallic compounds. However, only few studies have been published about the SHS of pure aluminosilicate ceramics. In the current work, possibilities for aluminosilicate ceramic synthesis and sintering requiring less energy based on the utilization of SHS in air was studied. Kaolinite powder and exothermically reactive metallic aluminium powder were used as raw materials. Thermodynamic calculations for the possible reactions and reaction paths were performed to show the theoretical possibilities for SHS utilization. The chemical reactions, thermal expansion behaviour and formed phase- and microstructures after SHS were compared to the conventional reaction sintering of mullite. Results conclude that highly exothermic reactions above 900 °C relating mainly to aluminium oxidation can ignite the SHS reaction in air atmosphere. After initialization, the reaction proceeded in a self-sustaining manner through entire test pieces, resulting in the formation of an Al2O3 - Si phase structure. Thermodynamic calculations showed the total energy balance for mullite formation from aluminium and kaolinite mixtures as highly exothermic in nature only if sufficient oxygen is available to complete the reactions. However, future research is needed to fully utilize SHS in aluminosilicate ceramics processing.

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Keywords

Aluminosilicate ceramics, self-propagating high-temperature synthesis, SHS, exothermic reactions, synthesis, sintering

References

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