Mg/CaCl_2高导热传热蓄热材料的制备与性能

Preparation and Properties of High Thermal Conductivity Mg/CaCl_2 Materials for Heat Storage and Transfer

以无机盐氯化钙(CaCl_2)作为高温传热蓄热材料,添加金属镁(Mg)作为传热增强剂,采用静态熔融法制备具有高导热性能的Mg/CaCl_2传热蓄热材料。实验结果表明:在熔融状态下,镁条熔化成为小液滴并弥散分布以"金属雾"形式分散在氯化钙熔体中。金属镁的加入几乎没有改变体系的熔点,但是随着镁含量的增大,体系的潜热先减小后增大,导热系数先增大后减小。当镁添加量w(Mg)=0.1时,导热系数增大了41.17%。

Calcium chloride was used as high-temperature thermal energy storage and transfer material, and magnesium was added as heat transfer enhancer. Mg/CaCl2 composites with high thermal conductivity were made by statically nfixing method. The results showed that magnesium slice would turned to droplet and dispersively distributed in molten salts in the form of metal fog. The addition of magnesium didn＇t change the melting point of system. But the latent heat showed a sharply increased at first and then decreased with the addition of magnesium loading increased, while the thermal conductivity displayed the opposite tendency. Compared with thermal conductivity of pure calcium chloride, the composites with w（Mg）=0.1 improved 41.17%.