Abstract In this study, a series of 1-octadecanol (OD) composite phase change materials (PCMs) with stable shape were prepared by adding nano‑silicon carbide (SiC), expanded graphite (EG) and SiC/EG composite respectively. The thermal conductivity of OD/SiC, OD/EG and OD/SiC/EG were 0.432, 0.607 and 0.996 W·m−1·K−1 respectively when the mass fraction was all 5 wt%. The results indicated that among the above three additives, SiC/EG composite had the best enhancement effect on the thermal conductivity of organic PCMs, while the thermal conductivity of OD/SiC/EG composite with 9 wt% SiC/EG addition was 1.674 W·m−1·K−1, which was more than 4 times that of pure OD. SEM results showed that SiC distributed uniformly on the surface of EG without obvious agglomeration. SiC/EG could replace EG as a new excellent thermal conductivity reinforcement. The phase transition temperature and phase transition enthalpy of OD/SiC/EG composite were 58.6 °C and 210 J/g, respectively, which also processed sufficient thermal stability. The prepared OD/SiC/EG composite heat storage materials had both high thermal conductivity and large storage energy density, which can meet the demands of low temperature heat storage fields, such as thermal control of electronic components, building materials and solar energy systems.

中文翻译：

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纳米碳化硅对热储能膨胀石墨/1-十八醇复合材料热性能的影响

摘要 本研究通过分别添加纳米碳化硅（SiC）、膨胀石墨（EG）和SiC/EG复合材料，制备了一系列形状稳定的1-十八醇（OD）复合相变材料（PCMs）。当质量分数均为5wt%时，OD/SiC、OD/EG和OD/SiC/EG的热导率分别为0.432、0.607和0.996 W·m-1·K-1。结果表明，在上述三种添加剂中，SiC/EG复合材料对有机相变材料的热导率增强效果最好，而添加9wt% SiC/EG的OD/SiC/EG复合材料的热导率为1.674 W· m-1·K-1，是纯OD的4倍以上。SEM结果表明，SiC均匀分布在EG表面，无明显团聚。SiC/EG 可以替代 EG 作为一种新型的优良导热增强材料。OD/SiC/EG 复合材料的相变温度和相变焓分别为 58.6 °C 和 210 J/g，也具有足够的热稳定性。制备的OD/SiC/EG复合蓄热材料兼具高热导率和大储能密度，可满足低温蓄热领域的需求，如电子元件、建筑材料和太阳能系统的热控制。