Mg-Zn-Sn合金相变储热性能

Preparation and Thermophysical Properties of Mg-Zn-Sn Alloy Phase Change Material

利用真空快速磁感应加热炉制备Mg-Zn-Sn合金相变储能材料。采用X射线衍射分析(XRD)、扫描电子显微镜(SEM)、差式扫描热分析仪(DSC)等分析技术研究了4种不同配比Mg-Zn-Sn合金相变储能材料的微观结构和储热性能。结果表明:4种储热材料的相变温度在320～370?C之间,相变潜热随成分Zn和Sn的增加而增加,其中Mg-35Zn-35Sn(质量分数)合金相变潜热最高,为79.54 J/g。结合微观结构和相变潜热分析发现,在合金制备过程中,Mg和Zn形成金属化合物Mg2Sn,不利于合金材料的相变储能;合金材料在升温相变储能过程中,材料不会损耗。

Mg-Zn-Sn alloy phase change materials（PCMs） were prepared by fast magnetic vacuum induction furnace. The micro structure,thermal properties and stability of four different ratios alloys were determined by using XRD, SEM and DSC, respectively. Theresults showed that the phase change temperature of the PCMs was between 320 and 370 ±C, and Mg-35Zn-35Sn （mass fraction） alloyhad the highest phase change enthalpy with 79.54 J/g. The content of Zn and Sn had an obvious contribution to the phase changeenthalpy. Besides, the intermetallic compounds Mg2Sn had found by microstructure and phase change enthalpy analysis, which washarmful to energy storage. It was due to the chemical reaction between Mg and Zn during the preparation. TG results showed that thePCMs did not wear and tear during the temperatures elevated.