Preparation and characterization of Al-12Si/ceramic composite phase change heat storage material

IF 2.6 4区 工程技术 Q3 ENERGY & FUELS Frontiers in Energy Research Pub Date : 2024-08-23 DOI:10.3389/fenrg.2024.1455576
Gaoqun Zhang, Dabo Duan, Jingcen Zhang, Junjie Hao, Zhanfeng Deng
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Abstract

Thermal storage ceramics using metals as phase change materials (PCMs) have both high thermal conductivity and high heat storage density. However, in the process of use is very easy to occur in the metal phase change material leakage, will seriously affect the service life of the thermal storage ceramics. In this study, ceramic composite phase change heat storage materials with Al-12Si alloy as phase change material were prepared. Firstly, Al-12Si was pretreated by sol-gel method and high temperature heat treatment to obtain the pretreated Al-12Si alloy powder with dense alumina shell layer. After that, the pretreated Al-12Si alloy powder was mixed and pressed with alumina, silicon dioxide, magnesium oxide, and mullite respectively, and sintered at 1,100°C, 1,200°C, or 1,300°C. The experimental results show that the metal phase change materials and the four ceramic materials show good chemical compatibility, and pretreated Al-12Si essentially retains its initial shape and is uniformly dispersed in the heat storage material. Among all the samples, the pre-treated Al-12Si/mullite ceramic thermal storage materials with a sintering temperature of 1,200°C showed the best thermal storage performance. The thermal conductivity of the samples was up to 17.94 W/(m·K). The latent heat storage value was 139.51 J/g before thermal cycling, 138.27 J/g after 100 thermal cycling, which was only decreased by 0.89%, and there was almost no alloy leakage. This study has successfully realized that the ceramic thermal storage material possesses high thermal conductivity, high thermal storage density and excellent thermal cycling performance at the same time, and provides a new method for the production and preparation of Al-12Si/ceramic heat storage materials, which has great potential for application in heat storage systems.
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铝-12Si/陶瓷复合相变蓄热材料的制备与表征
使用金属作为相变材料(PCM)的蓄热陶瓷具有高导热性和高蓄热密度。但在使用过程中极易发生金属相变材料的泄漏,将严重影响蓄热陶瓷的使用寿命。本研究制备了以 Al-12Si 合金为相变材料的陶瓷复合相变蓄热材料。首先,通过溶胶-凝胶法和高温热处理对 Al-12Si 进行预处理,得到具有致密氧化铝外壳层的预处理 Al-12Si 合金粉末。然后,将预处理后的 Al-12Si 合金粉末分别与氧化铝、二氧化硅、氧化镁和莫来石混合压制,并在 1,100°C 、1,200°C 或 1,300°C 下烧结。实验结果表明,金属相变材料与四种陶瓷材料具有良好的化学相容性,预处理后的 Al-12Si 基本保持了初始形状,并均匀地分散在储热材料中。在所有样品中,烧结温度为 1,200°C 的预处理 Al-12Si/mullite 陶瓷蓄热材料的蓄热性能最好。样品的导热系数高达 17.94 W/(m-K)。热循环前的潜热存储值为 139.51 J/g,热循环 100 次后为 138.27 J/g,仅下降了 0.89%,而且几乎没有合金泄漏。该研究成功实现了陶瓷蓄热材料同时具有高导热系数、高蓄热密度和优异的热循环性能,为 Al-12Si/ 陶瓷蓄热材料的生产和制备提供了一种新方法,在蓄热系统中的应用潜力巨大。
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来源期刊
Frontiers in Energy Research
Frontiers in Energy Research Economics, Econometrics and Finance-Economics and Econometrics
CiteScore
3.90
自引率
11.80%
发文量
1727
审稿时长
12 weeks
期刊介绍: Frontiers in Energy Research makes use of the unique Frontiers platform for open-access publishing and research networking for scientists, which provides an equal opportunity to seek, share and create knowledge. The mission of Frontiers is to place publishing back in the hands of working scientists and to promote an interactive, fair, and efficient review process. Articles are peer-reviewed according to the Frontiers review guidelines, which evaluate manuscripts on objective editorial criteria
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