Abstract: Al-based energy storage materials have the advantages of low transition temperature, high heat storage density, low under cooling in endothermic and exothermic processes and stable performance. In this paper, the effects of cooling rate, solidification path and hardness on thermal storage properties of the selected seven ternary Al-Cu-Si alloys were studied by means of microstructure analysis, DSC test and thermodynamic calculation. The results show that phase change thermal storage capacity of Al-Cu-Si alloy increases with the amount of eutectic phase, and is related to the type of eutectic phase. The phase change thermal storage capacity of ternary eutectic (α+β+θ) is better than that of binary eutectic (α+θ) and (α+β), and the binary eutectic (α+β) is better than that of (α+θ) and primary phase α. When cooling rate is about 100 times different, it can result in significant changes in phase change thermal storage capacity. The phase change energy storage capacity of samples of graphite molds is generally better than that of sand and insulated molds. The phase change thermal storage capacity of samples with Al-Cu-Si eutectic composition decrease with the decrease of cooling rate. The phase change thermal storage values are 302.5 J/g, 294.5 J/g and 287.8 J/g, respectively, and the temperature range of phase transformation is narrow, only about 10 ℃.
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2020, Vol. 34 
