An investigation of the physical, thermal and mechanical properties of fired clay/SiC ceramics for thermal energy storage

  • Abdoul Razac Sane
  • Pierre-Marie Nigay
  • Doan Pham MinhEmail author
  • Claudia Toussaint
  • Alain Germeau
  • Nawal Semlal
  • Rachid Boulif
  • Ange Nzihou


Thermal energy storage (TES) has been identified as a breakthrough concept in development of renewable technologies. However, the main challenges are related to the development of competitive heat storage materials. Despite the number of studies on heat storage materials, the determination of new alternatives for next generation technologies is still open. In this regard, this paper presents the results of an experimental study of the physical, thermal and mechanical properties of SiC-doped ceramics as potential materials for TES applications. Two kinds of SiC additives (high and low densities) were incorporated with different percentages into the clay matrix in order to produce ceramics via the extrusion process. The addition of low-density SiC (true density 3.16 g cm−3) led to the increasing of porosity with large pore sizes and the decreasing of bulk density. Therefore, the thermal and mechanical properties are decreased up to − 50% for flexural strength and − 15% for thermal conductivity when 20 mass% of low-density SiC was used. On the other hand, when high-density SiC (true density 3.42 g cm−3) was used, properties of the clay ceramic were strongly improved: i.e., increase in the bulk density, decrease in the porosity, increase in the thermal conductivity and increase in the flexural strength. The best material was found with the addition of 20 mass% of high-density SiC which had a thermal conductivity of 1 W m−1 K−1, a specific heat capacity of 0.62 kJ kg−1 K−1 and a mechanical strength of 19.6 MPa. It also showed a high thermal stability after 20 successive heating/cooling cycles. Hence, this study provided a useful insight into how the SiC modified the microstructure and properties of fired clay ceramics. Thus, the current results suggest that clay ceramics with high-density SiC addition are promising materials for thermal energy storage applications.


SiC Clay Ceramic Thermal energy storage Thermal analysis Thermal properties Mechanical strength Microstructure 



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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Université de Toulouse, IMT Mines Albi, CNRS, Centre RAPSODEEAlbi Cedex 09France
  2. 2.Institute of Research and DevelopmentDuy Tan UniversityDa NangVietnam
  3. 3.PRAYON SA, Service R&DEngisBelgium
  4. 4.Innovation, OCP SAEl JadidaMorocco
  5. 5.Chemical and Biochemical SciencesMohamed VI Polytechnic UniversityBenguérirMorocco

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