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High-temperature alloy/honeycomb ceramic composite materials for solar thermal storage applications: Preparation and stability evaluation |
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| Affiliation: | 1. National Engineering Research Center for Domestic and Building Ceramics, Jingdezhen Ceramic Institute, Jingdezhen 333000, PR China;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, PR China;3. Ceramic Intellectual Property Information Center, Jingdezhen Ceramic Institute, Jingdezhen 333000, PR China;1. Department of Materials Science and Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China;2. School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China;1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. Institute of Particle Science & Engineering, University of Leeds, Leeds LS2 9JT, UK;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;5. Centre for Cryogenic Energy Storage, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK |
| Abstract: | SiCw/Al2O3 honeycomb ceramics were engaged as sensible shell materials for encapsulating Al-Si alloys (latent heat materials) in the honeycomb holes to obtain alloy/ceramic composite materials with a high thermal storage capacity for high-temperature solar thermal storage applications. The stability evaluation between the sensible honeycomb ceramics and the latent alloys had been conducted and the failure mechanism for the latent alloys was investigated. Results indicated that the addition of the latent alloys could improve the thermal storage capacity of the sensible honeycomb ceramics significantly by >114% and the thermal storage densities of honeycombs containing Al-12Si and Al-20Si alloys were 1141.3 kJ/kg and 1106 kJ/kg (400–900 °C), respectively. The composite materials exhibited excellent physical and chemical stability. No cracks formed in the honeycomb ceramics and no leakage of alloys was discovered after the composite materials were exposed to 100 thermal cycles in a high-temperature testing environment. The oxidation of Al at >600 °C would lower the latent heat of alloys and the thermal storage densities decreased to 1039.9 kJ/kg and 1013.2 kJ/kg after enduring 100 thermal cycles. This study not only provides a sensible-latent system of thermal storage materials with excellent stability but also gives an insight into the protection of metal containers against the corrosion from Al-based alloys. |
| Keywords: | Alloy/ceramic composites Solar thermal storage Thermal storage capacity Stability evaluation Failure mechanism |
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