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本文以二元共晶碳酸盐(Li_2CO_3-K_2CO_3)为高温相变储热材料,泡沫金属铜为骨架基体,制备了具有高导热性能、高储热密度的金属基复合高温相变储热材料。对复合材料制备过程中泡沫金属的填埋方式等制备条件进行了优选,对相变材料的储热密度及导热系数进行了计算和测试,分析了泡沫铜孔密度、孔隙率等参数对材料性能的影响规律。结果表明:40 PPI泡沫金属在相变材料中的最佳填埋方式为中埋法,35 PPI泡沫金属的最佳填埋方式为底埋法。使用孔隙率在95%左右的泡沫铜,可使相变材料导热系数提高3~4倍,同时保证了复合相变材料具有较高的储热密度。
In this paper, binary phase eutectic carbonates (Li_2CO_3-K_2CO_3) are used as high-temperature phase-change heat storage materials and foam metal copper as the matrix, and a metal matrix composite high temperature phase change material with high thermal conductivity and high heat storage density . The preparation conditions of the metal foam in the preparation of composites were optimized. The heat storage density and thermal conductivity of the phase change material were calculated and tested. The effects of the density and porosity of the copper foam on the properties of the material The law of influence. The results show that the best landfill method for 40 PPI foam metal in the phase change material is buried method, and the best landfill method for 35 PPI foam metal is the buried method. The use of foamed copper with a porosity of about 95% can improve the thermal conductivity of the phase change material by 3 to 4 times, and at the same time ensure that the composite phase change material has high heat storage density.