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采用金相显微镜(OM)、X-射线衍射仪(XRD)、差热扫描仪(DSC)等分析手段对Mg-15Ca-15Zn-6Cu合金相变储热材料的组织结构与热物性参数进行了分析。通过反复熔化-凝固热循环试验,研究了该合金的热循环稳定性。结果表明,Mg-15Ca-15Zn-6Cu合金经历1 000次热循环后的相变温度和相变潜热分别为510.2℃和198.7J/g,与循环前的初始合金相比,相变温度提高了5.5%,相变潜热减小了5.56%,因此,表现出良好的热循环稳定性。
The microstructure and thermal properties of Mg-15Ca-15Zn-6Cu alloy phase-change thermal storage materials were analyzed by OM, XRD and DSC. analysis. The thermal cycling stability of the alloy was studied by repeated melting-solidification thermal cycling tests. The results show that the phase transition temperature and phase transition latent heat of Mg-15Ca-15Zn-6Cu alloy after 1000 thermal cycles are 510.2 ℃ and 198.7J / g, respectively. Compared with the initial alloy before cycling, the phase transition temperature increases 5.5%, the latent heat of phase transformation is reduced by 5.56%, therefore, it shows good thermal cycle stability.