以低熔点合金(LMPA)为相变材料、膨胀石墨(EG)作为多孔吸附基质和支撑材料,经熔融混合和加压压制制备出EG/LMPA定形复合相变材料(LMPA质量分数为90%),并对材料的微观结构和化学成分进行测试。结果表明,EG/LMPA中EG的多孔结构可有效地吸附LMPA,经多次加热-冷却循环的热循环稳定性较好;表观密度为3 397 kg/m³时导热系数为 46.15 W/(m·K),与纯合金相比提高了209.1%,储能容量可达1.0×10⁵ kJ/m³。

With low melting point alloy (LMPA) as phase change material and expanded graphite (EG) as porous adsorption substrate and supporting material,EG/LMPA shape-stabilized phase change material (90 wt% LMPA) is prepared via melting mixing and pressing methods.The microstructure and chemical composition of the material are also tested.It is found that the porous structure of EG in EG/LMPA can effectively adsorb LMPA,and EG/LMPA material remains a good thermal cycle stability after several heating-cooling cycles.EG/LMPA has a thermal conductivity of 46.15 W·m^-1·K^-1,209.1% higher than that of pure alloy,and its energy storage capacity can reach 1.0×10⁵ kJ·m^-3 when the apparent density is 3 397 kg·m^-3.

朱晨茜(1997-),女,硕士生,研究方向为中低温复合相变材料,923172249@qq.com。