氯化钠-硫酸钠/硅基相变材料的热物性研究

doi:10.19964/j.issn.1006-4990.2022-0730

Abstract

Abstract:

NaCl-Na₂SO₄ eutectic molten salts were prepared by the high temperature melting process.Composites phase change materials with silicon porous matrix were prepared by employing the mesoporous MCM-41 and microporous 13X as carriers for the problems of leakages and strong corrosion of molten salts.The changes in the structure，microtopography and thermophysical property of the composite phase change materials were investigated by the various methods.The results showed that the pore structure and crystalline structure of the silicon-based materials remained intact after the loading of molten salt.The silicon-based material as the skeleton played a role in setting and improving the stability at high temperature.The melting point of NaCl-Na₂SO₄ molten salts was 623 ℃，the melting point of composites using the mesoporous MCM-41 was 618 ℃，and the melting point of composites using the microporous 13X was 607 ℃.The melting point of the composites was slightly reduced after loading with the molten salts.The weight loss of NaCl-Na₂SO₄ molten salts was more than 3% at 700 ℃.The decomposition temperature of composites using MCM-41 was increased and the specific calorific value was 0.652 J/（g·℃）.MCM-41 silicon-based material had good compatibility with eutectic salt.It could effectively improve the leakage and strong corrosion of molten salt in the service process and had important research implications and applications value.

Key words: NaCl-Na₂SO₄ molten salt, corrosion, silicon-based phase change materials, composite, thermophysical property

CLC Number:

TQ131.12

YUAN Ziou, WANG Feng, QI Xingzhao, ZHANG Qi, MA Jianlong, TANG Zhongfeng. Thermal properties of sodium chloride-sodium sulfate/silicon-based phase change composites[J]. Inorganic Chemicals Industry, 2023, 55(10): 114-120.

Figures/Tables 8

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Thermal properties of sodium chloride-sodium sulfate/silicon-based phase change composites

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