中文摘要：

根据高温热利用技术领域对传热蓄热材料的性能要求,选取高熔化热、高熔点的无机盐作为添加剂,对现有Na_2CO_3-K_2CO_3二元熔盐体系进行改性,采用静态熔融法制备了混合碳酸熔盐。表征分析了碳酸熔盐的熔点、相变潜热、高温密度和黏度等热物性,并研究了高温静态和蓄/放热循环下的热稳定性。研究结果表明,该碳酸熔盐具有相变潜热大、熔点低、工作温度范围广等优点,并具有良好的热稳定性,降低了对蓄热系统尺寸和能量的要求。

英文摘要：

According to the performance demand of heat transfer and storage materials in high- temperature thermal utilization, several specific inorganic salts with large latent heat and high melting point were selected as the additives. Based on Na2CO3-K2CO3 basic binary molten salt, the mixed carbonate molten salt materials were prepared by static melting methods. The thermM properties of the molten carbonate salts such as melting point, latent heat, density and viscosity were measured and analyzed. The thermal stability was also investigated under the conditions of constant high temperature and heat storage/release cycle experiments. The results show that the prepared molten carbonate salts have many advantages, such as larger latent heat, lower melting point, wider operating temperature range and excellent thermal stability. The requirement for size and energy of heat storage system can be reduced accordingly.