高温复合相变蓄热材料压制工艺及性能研究

以铝粉作为相变材料，采用单向模压成型的方法制备出了一种新型高温复合相变蓄热材料。利用金相显微镜和扫描电子显微镜对材料进行分析，从材料混合程度、显微组织、成分结构及表面形貌等方面研究了相变蓄热材料的制备机理和性能影响因素，同时探讨了粉末流动性、堆积密度和粒径配比等参数对相变蓄热材料压坯性能的影响。结果表明:高温复合相变蓄热材料在压制过程中，固相和液相组分不变，主要是气孔以及颗粒形状的宏观和微观变化；随着压制压力增加和保压时间的延长，试样密度逐渐增加，气孔率下降，强度随之增加；相变材料的宏观分布也较为均匀。

Study on compacting process and properties of high temperature composite phase change thermal storage material

A novel high temperature composite phase change thermal storage material was prepared by one-way compression molding using aluminum powders as the phase change material. The phase change thermal storage materials were investigated by metallographic microscopy and scanning electron microscopy. The mixability, surface morphology, microstructures, and constituent structure of phase change thermal storage materials were analyzed to study the preparation mechanism and influence factors in compacting process. At the same time, the liquidity, stacking density, and particle size ratio were also analyzed. The results show that, the constituents of solid and liquid phases are not changed during the compacting process, the macroscopic and microcosmic changes are mainly in the shape of pores and particles. With the pressure and holding time increasing, the density and intensity of materials increase, the porosity decreases, and the macroscopic distribution of materials are distributed uniformly.