用水溶液法制备了膨胀石墨/LiCl-NaCl复合相变储能材料,利用扫描电镜观测了试样的微观形貌,并且利用Hot-Disk热学常数分析仪测试了试样常温下的导热系数.实验结果表明,共晶盐能够被吸附到石墨片层之间,形成稳定、均一的复合相变材料;其导热系数随压力和石墨含量的增加而不断增大,并具有各向异性;成型压力和膨胀石墨掺量是影响其性质的两个重要因素,在一定范围内,其导热系数和各向异性随成型压力的增加而增大,压力超过一定范围,两者变化幅度减小;石墨掺量达不到一定比率时,其导热系数和各向异性变化不显著,当达到一定比率后,两者变化幅度增大;成型压力和膨胀石墨掺量对其导热系数的影响有耦合作用;通过取向度Φ给出了垂直压力和平行压力方向上的导热系数计算公式.
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