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Journal articles
The impact of heat treatment on the microstructure of a clay ceramic and its thermal and mechanical properties
Abstract : This paper presents the results of an experimental study on the microstructure, the thermal and the mechanical properties of a clay-based ceramic used in building applications. The X-ray tomography analysis showed a layered microstructure of clay with 200 mu m sheets of porosity after the extrusion process. The gas release from the dehydration, dehydroxylation and decarbonation induced a 7 vol% formation of porosity during the heat treatment of the clay-based ceramic up to 850 degrees C. The porosity increase and the development of metakaolin led to a 38% decrease in the thermal conductivity. On the other hand, the Young's modulus of the clay-based ceramic was conserved due to the formation of smaller pores than the 200 mu m sheets of porosity. The densification and the crystallization of amorphous phases also led to a 110% increase of the Young's modulus from 850 degrees C to 1050 degrees C. The Young's modulus of the clay-based ceramic was only decreased by the 13 Kt quartz inversion of the cooling due to sand addition. Hence, this study provided a useful insight into how the microstructure of fired clay bricks can be specifically transformed by the porosity during the heat treatment to control the thermal and mechanical properties.
Cited literature [27 references]
https://hal.archives-ouvertes.fr/hal-01619238
Contributor : Imt Mines Albi Ecole Nationale Supérieure Des Mines d'Albi-Carmaux <>
Submitted on : Tuesday, November 6, 2018 - 4:32:51 PM
Last modification on : Wednesday, June 24, 2020 - 4:19:27 PM
Long-term archiving on: : Thursday, February 7, 2019 - 4:07:33 PM
Contributor : Imt Mines Albi Ecole Nationale Supérieure Des Mines d'Albi-Carmaux <>
Submitted on : Tuesday, November 6, 2018 - 4:32:51 PM
Last modification on : Wednesday, June 24, 2020 - 4:19:27 PM
Long-term archiving on: : Thursday, February 7, 2019 - 4:07:33 PM
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