中文摘要：

采用溶液浸渍法制备出硝酸钠/硅藻土复合相变材料，并采用扫描电子显微镜（SEM）、X射线衍射（XRD）、差示扫描量热法（DSC）分别对其形貌、成分、相变性能进行表征；同时对该复合相变材料的热稳定性进行探讨。DSC结果显示，硝酸钠，硅藻土复合相变材料的熔点（Tm）是305℃，凝固点（R）是299．7℃，熔融焓（△Hm）和凝固焓（△Hc）分别是：94．1J/g和94．3J/g。热稳定性测试显示硝酸钠／硅藻土复合相变材料经过热循环后仍然保持了良好的热稳定性。

英文摘要：

A novel composite phase change material, NaNO3/diatomite, was prepared for thermal storage by solution impregnation method. The prepared NaNO3/diatomite composite was characterized by the scanning electron microscope （SEM） and X-ray diffraction（XRD）. Thermal storage property of NaNO3/diatomite was studied by differential scanning calorimetry （DSC）. DSC results show that the melting point （Tm） and the freezing point （Tc） of NaNO3/diatomite were 305.0 ℃ and 299.7 ℃, and the latent heats of melting and freezing were 94.1 and 94.3 J/g, respectively. Thermal reliability tests presented that the prepared NaNO3/diatomite possessed excellent thermal stability after thermal cycling.