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在Al-Si合金的基础上,优化设计并制备了3种不同成分的Al-Si-Cu-Mg铝基相变储热材料。采用X射线衍射(XRD)、扫描电镜(SEM)分析、差示扫描量热分析(DSC)等手段,对4种不同成分的铝基高温相变储热材料的微观组织、密度、相变温度、储热性能等进行了研究。结果表明,4种储热材料的相变温度都处于500～650℃之间,且相变潜热都在300J·g-1以上。Al-13Si合金储热材料具有较高的单位质量储热量;Al-Si-Cu-Mg合金储热材料具有较大的单位体积储热量。Mg能显著降低储热材料的相变温度,具有较好的扩大储热温度范围的作用。Cu能显著增大储热材料的密度,使其具有更好的单位体积储热性能。
Based on Al-Si alloy, three kinds of Al-Si-Cu-Mg aluminum-based phase-change heat storage materials were optimized and prepared. The microstructure, density, phase transition temperature (FTIR) and microstructure of four different compositions of aluminum-based high temperature phase-change heat storage materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) , Heat storage performance were studied. The results show that the phase transformation temperatures of the four kinds of heat storage materials are between 500 and 650 ℃, and the latent heat of phase transformation is above 300J · g-1. Al-13Si alloy heat storage material has a higher heat capacity per unit mass; Al-Si-Cu-Mg alloy heat storage material has a larger heat capacity per unit volume. Mg can significantly reduce the phase transition temperature of the heat storage material, and has a good effect of expanding the storage temperature range. Cu can significantly increase the density of heat storage materials, so that it has better heat storage performance per unit volume.