期刊
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
卷 13, 期 4, 页码 727-735出版社
SPRINGER
DOI: 10.1007/s11705-019-1823-2
关键词
cold sintering process; composite fabrication; thermal energy storage; phase change materials
资金
- Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom [EP/N000714/1, EP/N021142/1]
- Petroleum Technology Development Fund
- EPSRC [EP/N032888/1, EP/N000714/1, EP/N021142/1] Funding Source: UKRI
A form stable NaCl-Al2O3 (50-50 wt-%) composite material for high temperature thermal energy storage was fabricated by cold sintering process, a process recently applied to the densification of ceramics at low temperature 300 degrees C under uniaxial pressure in the presence of small amount of transient liquid. The fabricated composite achieved as high as 98.65% of the theoretical density. The NaCl-Al2O3 composite also retained the chloride salt without leakage after 30 heating-cooling cycles between 750 degrees C-850 degrees C together with a holding period of 24 h at 850 degrees C. X-ray diffraction measurements indicated congruent solubility of the alumina in chloride salt, excellent compatibility of NaCl with Al2O3, and chemical stability at high temperature. Structural analysis by scanning electron microscope also showed limited grain growth, high density, uniform NaCl distribution and clear faceted composite structure without inter-diffusion. The latent heat storage density of 252.5 J/g was obtained from simultaneous thermal analysis. Fracture strength test showed high sintered strength around 5 GPa after 50 min. The composite was found to have fair mass losses due to volatilization. Overall, cold sintering process has the potential to be an efficient, safe and cost-effective strategy for the fabrication of high temperature thermal energy storage materials.
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