为提高相变储能材料的热导率和稳定性，以聚乙二醇（PEG）、SiO₂和泡沫镍为原料，基于溶胶-凝胶和真空浸渍法制备了一种新型热导率增强的定形复合相变材料PEG/SiO₂-Ni，并对其性能进行表征。结果表明，镍泡沫的引入使复合相变材料的热导率达到0.57 W/（m·K），与PEG/SiO₂相比，热导率提高了96.6%，其储热所用时间也相对减少了63.4%，有效提高了PEG/SiO₂-Ni相变材料强度和储/放热速率。同时，PEG/SiO₂-Ni相变材料还具有良好的定形相变效果、结构稳定性和较高的相变潜热。

In order to improve the thermal conductivity and thermal stability of phase-change energy storage material,a novel form-stable composite PEG/SiO₂-Ni phase change material with enhanced thermal conductivity is prepared through sol-gel and vacuum impregnation methods,with polyethylene glycol (PEG),SiO₂ and foam nickel as raw materials.The properties of the prepared material are characterized.Results indicate that the thermal conductivity of this composite phase change material reaches 0.57 W/(m·K) due to the adding of foam nickel,which has an increase of 96.6% compared with that of PEG/SiO₂ phase change material.In the meantime,the time that PEG/SiO₂-Ni spends in storing heat is shortened by 63.4% compared with that of PEG/SiO₂.The structural strength and heat charging-discharging rate of PEG/SiO₂-Ni are improved effectively.What's more,PEG/SiO₂-Ni exhibits preferably form-stable performance,structural stability and high phase change latent heat.

赵跃珍(1993-),女,硕士研究生,研究方向为相变材料,zhaoyz@mail.dlut.edu.cn