▎ 摘　　要

Lauric acid (LA)/iron foam composites with graphene nanoplates (GNP) as composite phase change materials (CPCM) were fabricated by melting infiltration. LA was used as a phase change material and iron foams with different pore density (40, 70 and 90 PPI) were used as skeletons. GNP was used as additives to improve thermal conductivity of the CPCM. Fourier transform infrared spectroscopy and X-ray diffraction were used to verify that LA was physically absorbed into iron foam. Scanning electron microscopy was employed to demonstrate that the LA and GNP were well immersed into the iron foam. The thermal properties were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and thermal conductivity meter. Impregnating LA with GNP into the metal foam is a novel way to enhance thermal properties of the CPCM. CPCM1 reached a latent heat of 177.82 kJ/kg in the solidifying process. The results of TGA and differential thermogravimetric analysis confirmed that the CPCM maintains good stability. The thermal conductivity of the CPCM has an obvious enhancement. The bigger pore density leads to higher thermal conductivity. The GNP can improve thermal conductivity effectively. Thermal conductivity of CPCM6 reaches 1.227 W/(m K), which is increased by 10.67 times compared to that of lauric acid.