Mechanical and thermal properties of cement composite graphite for solar thermal storage materials |
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| Authors: | Hui-Wen Yuan Chun-Hua Lu Zhong-Zi Xu Ya-Ru Ni Xiang-Hui Lan |
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| Affiliation: | 1. Department of Materials Science and Metallurgical Engineering, Universitat de Barcelona, Martí i Franqués 1, 08028 Barcelona, Spain;2. GREA Innovació Concurrent, Edifici CREA, Universitat de Lleida, Pere de Cabrera s/n, 25001-Lleida, Spain;3. Laboratory PROMES CNRS University of Perpignan, Rambla de la Thermodynamique-Tecnosud-66100 Perpignan, France;1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation, the Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;2. Automotive Department, Guangdong Industry Technical College, Guangzhou 510300, China;1. School of Power and Mechanical Engineering, Wuhan University, China;2. Guangzhou Kingfa Carbon Fiber Materials Development Co., LTD, China |
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| Abstract: | The comprehensive survey on an attractive thermal storage material consisted of aluminate cement and graphite is obtained in this paper. The effect of different water/cement (w/c) ratio and graphite content on compressive strength and thermal properties including thermal conductivity, volume heat capacity and thermal expansion coefficient of hardened aluminate cement pastes were investigated to pursue the optimum material design for solar parabolic trough power plant. It is observed that thermal conductivity and volume heat capacity were improved with the decrease of w/c and the increase of graphite content. The results show that w/c is a key factor affecting thermal properties of pastes and graphite even has some influence on the hydration process. After heat treatment at 350 °C for 6 h, compressive strength and thermal properties descended in a certain extent. XRD and FTIR were used to characterize the evolution of hydration products together. Furthermore, the properties obtained from the paper will lay the foundation for thermal storage materials of solar thermal power plants in the future. |
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