Molten chloride salts are considered a promising thermal storage materials because of their high energy storage density and thermal stability. However, the application of molten chloride salts is districted by its the corrosion behavior with metal containers. Encapsulation is one viable method for corrosion prevention. In this study, molten chloride salts as phase change materials (PCMs) were combined with encapsulation materials to form stable shape phase change materials (SSPCMs). The PCM was the mixture of NaCl and KCl eutectic salts, and the encapsulation material was kaolin. The SSPCMs were prepared by direct mixing and sintering, and the morphology and the thermal behaviors of the SSPCMs were investigated. The results showed that PCMs were uniformly distributed in kaolin, and the kaolin was compatible with NaCl-KCl. With the increase of the ratio of NaCl-KCl eutectic salt, the latent heat and energy storage density of SSPCMs increased. Meanwhile, the results indicated that the NaCl-KCl/kaolin composite with salt content of 80 wt% demonstrated the best performance with the phase change enthalpy of 178 J/g and the energy storage density of 171.32 J/cm³. Besides, it could maintain intact shape after 400 thermal cycling tests from 600 to 700 °C.

氯化熔融盐因其高能量存储密度和热稳定性而被认为是一种很有前途的蓄热材料。然而，熔融氯化物盐的应用受到其对金属容器的腐蚀行为的限制。封装是一种可行的防腐蚀方法。在这项研究中，熔融氯化盐作为相变材料 (PCMs) 与封装材料结合形成稳定形状相变材料 (SSPCMs)。PCM是NaCl和KCl共晶盐的混合物，封装材料是高岭土。通过直接混合和烧结制备 SSPCMs，并研究了 SSPCMs 的形貌和热行为。结果表明PCMs在高岭土中分布均匀，高岭土与NaCl-KCl相容。随着NaCl-KCl共晶盐比例的增加，SSPCMs的潜热和储能密度增加。同时，结果表明，含盐量为 80 wt% 的 NaCl-KCl/高岭土复合材料表现出最佳性能，相变焓为 178 J/g，储能密度为 171.32 J/cm³ . 此外，它可以在 600 到 700°C 的 400 次热循环测试后保持完整的形状。