纳米氧化铋强化氯化盐/氧化镁复合材料制备及热物性研究

doi:10.19964/j.issn.1006-4990.2024-0122

摘要/Abstract

摘要：

为开发一种低成本、热性能好的复合相变储热材料。以NaCl、KCl、CaCl₂为相变材料，MgO为载体材料，纳米Bi₂O₃为导热增强剂，通过混合烧结法制备出了氯化盐/氧化镁基复合相变储热材料。通过X射线衍射、扫描电子显微镜、同步热分析仪、DRL导热仪等方式，进行了导热增强剂对氯化盐/氧化镁基复合相变储热材料的化学相容性、微观结构、比热容、导热系数的测试与表征。结果表明，导热增强剂纳米氧化铋含量为2％（质量分数）时热物性最好，比热容为1.16 J/（g·K），储热密度为232.93 J/g，导热系数为1.61 W/（m·K）。相较于未添加导热增强剂的比热容提高40%，导热系数提高55%，储热密度提高9%。所制备的氯化盐/氧化镁复合相变储热材料，使用过程中始终保持固定形态，比热容和导热系数有较大提高，在高温状态下具有良好的热稳定性，该研究为高温储热领域提供了一种可供选用的低成本且综合性能良好的储热材料，在热能储存系统具有广阔的应用前景。

关键词: 氯化盐, 氧化镁, 导热增强剂, 纳米氧化铋, 复合相变储热材料, 热物性

Abstract:

In order to develop a low-cost，good thermal performance of the composite phase change heat storage material，NaCl，KCl，CaCl₂ were used as phase change materials，MgO as carrier materials，and nano Bi₂O₃ as thermal conductivity enhancers，chloride/magnesium oxide-based composite phase change thermal storage materials were prepared by mixed sintering method.The chemical compatibility，microstructure，specific heat capacity and thermal conductivity of the chloride/magnesium oxide-based composite phase change heat storage materials by the thermal enhancer were tested and characterized by X-ray diffraction，scanning electron microscopy，synchronous thermal analyzer and DRL thermal conductivity.The results showed that the thermal physical properties of the thermal enhancer nano-bismuth oxide were the best when the content of 2%（mass fraction），the specific heat capacity was 1.16 J/（g·K），the heat storage density was 232.93 J/g，and the thermal conductivity was 1.61 W/（m·K）.Compared with the addition of thermal conductivity enhancer，the specific heat capacity was increased by 40%，the thermal conductivity was increased by 55%，and the heat storage density was increased by 9%.The prepared chloride/magnesium oxide composite phase change heat storage material always maintained a fixed form during use，the specific heat capacity and thermal conductivity were greatly improved，and it had good thermal stability at high temperatures.This study provided a low-cost and high-performance thermal storage material for the field of high-temperature thermal storage，which had broad application prospects in thermal energy storage systems.

Key words: chloride salt, magnesium oxide, thermal conductivity enhancer, bismuth oxide nanoparticles, composite phase change thermal storage material, thermal physical properties

中图分类号:

TQ135.32

王晨, 何伟, 孙梦媛. 纳米氧化铋强化氯化盐/氧化镁复合材料制备及热物性研究[J]. 无机盐工业, 2024, 56(12): 120-126.

WANG Chen, HE Wei, SUN Mengyuan. Research on preparation of nano-bismuth oxide-enhanced chloride/magnesium oxide composites and their thermophysical properties[J]. Inorganic Chemicals Industry, 2024, 56(12): 120-126.

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样品	起始温度/℃	峰值温度/℃	终止温度/℃	潜热值/ （J·g^-1）（测试）	潜热值/ （J·g^-1）（理论）
CMB0	493.5	509.8	516.6	68.47	70.5
CMB1	495.0	510.3	522.8	65.04	67.9
CMB2	493.2	514.0	520.8	61.42	64.3
CMB3	495.6	509.7	520.4	61.71	65.1
CMB4	495.4	509.5	519.0	60.10	63.8
CMB5	492.0	510.2	527.1	58.13	62.4

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